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Entry
- *601105 - CATHEPSIN K; CTSK
- OMIM
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<span class="h4">*601105</span>
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<strong>Table of Contents</strong>
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<a href="#title"><strong>Title</strong></a>
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<a href="#geneMap"><strong>Gene-Phenotype Relationships</strong></a>
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<a href="#text"><strong>Text</strong></a>
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<a href="#description">Description</a>
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<a href="#cloning">Cloning and Expression</a>
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<a href="#geneStructure">Gene Structure</a>
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<a href="#mapping">Mapping</a>
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<a href="#geneFunction">Gene Function</a>
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<li role="presentation" style="margin-left: 1em">
<a href="#molecularGenetics">Molecular Genetics</a>
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<a href="#animalModel">Animal Model</a>
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<a href="#allelicVariants"><strong>Allelic Variants</strong></a>
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<a href="#creationDate"><strong>Creation Date</strong></a>
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<a href="#mimProteinLinksFold" id="mimProteinLinksToggle" class="collapsed mimSingletonTriangleToggle" role="button" data-toggle="collapse" data-parent="#mimExternalLinksAccordion">
<span id="mimProteinLinksToggleTriangle" class="small mimSingletonTriangle" style="color: #337CB5">&#9658;</span> Protein
</a>
</span>
</span>
</div>
<div id="mimProteinLinksFold" class="panel-collapse collapse mimLinksFold" role="tabpanel">
<div class="panel-body small mim-panel-body">
<div><a href="https://hprd.org/summary?hprd_id=03064&isoform_id=03064_1&isoform_name=Isoform_1" class="mim-tip-hint" title="The Human Protein Reference Database; manually extracted and visually depicted information on human proteins." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'HPRD', 'domain': 'hprd.org'})">HPRD</a></div>
<div><a href="https://www.proteinatlas.org/search/CTSK" class="mim-tip-hint" title="The Human Protein Atlas contains information for a large majority of all human protein-coding genes regarding the expression and localization of the corresponding proteins based on both RNA and protein data." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'HumanProteinAtlas', 'domain': 'proteinatlas.org'})">Human Protein Atlas</a></div>
<div><a href="https://www.ncbi.nlm.nih.gov/protein/606923,836934,1168793,1195556,4503151,16359188,49456311,49456399,82503145,82503147,82503149,119573900,119573901,380254409" class="mim-tip-hint" title="NCBI protein data." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'NCBI Protein', 'domain': 'ncbi.nlm.nih.gov'})">NCBI Protein</a></div>
<div><a href="https://www.uniprot.org/uniprotkb/P43235" class="mim-tip-hint" title="Comprehensive protein sequence and functional information, including supporting data." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'UniProt', 'domain': 'uniprot.org'})">UniProt</a></div>
</div>
</div>
</div>
<div class="panel panel-default" style="margin-top: 0px; border-radius: 0px">
<div class="panel-heading mim-panel-heading" role="tab" id="mimGeneInfo">
<span class="panel-title">
<span class="small">
<a href="#mimGeneInfoLinksFold" id="mimGeneInfoLinksToggle" class="collapsed mimSingletonTriangleToggle" role="button" data-toggle="collapse" data-parent="#mimExternalLinksAccordion">
<div style="display: table-row">
<div id="mimGeneInfoLinksToggleTriangle" class="small mimSingletonTriangle" style="color: #337CB5; display: table-cell;">&#9658;</div>
&nbsp;
<div style="display: table-cell;">Gene Info</div>
</div>
</a>
</span>
</span>
</div>
<div id="mimGeneInfoLinksFold" class="panel-collapse collapse mimLinksFold" role="tabpanel">
<div class="panel-body small mim-panel-body">
<div><a href="http://biogps.org/#goto=genereport&id=1513" class="mim-tip-hint" title="The Gene Portal Hub; customizable portal of gene and protein function information." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'BioGPS', 'domain': 'biogps.org'})">BioGPS</a></div>
<div><a href="https://www.ensembl.org/Homo_sapiens/Gene/Summary?db=core;g=ENSG00000143387;t=ENST00000271651" class="mim-tip-hint" title="Orthologs, paralogs, regulatory regions, and splice variants." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Ensembl', 'domain': 'ensembl.org'})">Ensembl</a></div>
<div><a href="https://www.genecards.org/cgi-bin/carddisp.pl?gene=CTSK" class="mim-tip-hint" title="The Human Genome Compendium; web-based cards integrating automatically mined information on human genes." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'GeneCards', 'domain': 'genecards.org'})">GeneCards</a></div>
<div><a href="http://amigo.geneontology.org/amigo/search/annotation?q=CTSK" class="mim-tip-hint" title="Terms, defined using controlled vocabulary, representing gene product properties (biologic process, cellular component, molecular function) across species." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'GeneOntology', 'domain': 'amigo.geneontology.org'})">Gene Ontology</a></div>
<div><a href="https://www.genome.jp/dbget-bin/www_bget?hsa+1513" class="mim-tip-hint" title="Kyoto Encyclopedia of Genes and Genomes; diagrams of signaling pathways." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'KEGG', 'domain': 'genome.jp'})">KEGG</a></div>
<dd><a href="http://v1.marrvel.org/search/gene/CTSK" class="mim-tip-hint" title="Model organism Aggregated Resources for Rare Variant ExpLoration." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'MARRVEL', 'domain': 'marrvel.org'})">MARRVEL</a></dd>
<dd><a href="https://monarchinitiative.org/NCBIGene:1513" class="mim-tip-hint" title="Monarch Initiative." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Monarch', 'domain': 'monarchinitiative.org'})">Monarch</a></dd>
<div><a href="https://www.ncbi.nlm.nih.gov/gene/1513" class="mim-tip-hint" title="Gene-specific map, sequence, expression, structure, function, citation, and homology data." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'NCBI Gene', 'domain': 'ncbi.nlm.nih.gov'})">NCBI Gene</a></div>
<div><a href="https://genome.ucsc.edu/cgi-bin/hgGene?db=hg38&hgg_chrom=chr1&hgg_gene=ENST00000271651.8&hgg_start=150796208&hgg_end=150808260&hgg_type=knownGene" class="mim-tip-hint" title="UCSC Genome Bioinformatics; gene-specific structure and function information with links to other databases." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'UCSC', 'domain': 'genome.ucsc.edu'})">UCSC</a></div>
</div>
</div>
</div>
<div class="panel panel-default" style="margin-top: 0px; border-radius: 0px">
<div class="panel-heading mim-panel-heading" role="tab" id="mimClinicalResources">
<span class="panel-title">
<span class="small">
<a href="#mimClinicalResourcesLinksFold" id="mimClinicalResourcesLinksToggle" class="collapsed mimSingletonTriangleToggle" role="button" data-toggle="collapse" data-parent="#mimExternalLinksAccordion">
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<div id="mimClinicalResourcesLinksToggleTriangle" class="small mimSingletonTriangle" style="color: #337CB5; display: table-cell;">&#9658;</div>
&nbsp;
<div style="display: table-cell;">Clinical Resources</div>
</div>
</a>
</span>
</span>
</div>
<div id="mimClinicalResourcesLinksFold" class="panel-collapse collapse mimLinksFold" role="tabpanel" aria-labelledby="clinicalResources">
<div class="panel-body small mim-panel-body">
<div><a href="https://search.clinicalgenome.org/kb/genes/HGNC:2536" class="mim-tip-hint" title="A ClinGen curated resource of ratings for the strength of evidence supporting or refuting the clinical validity of the claim(s) that variation in a particular gene causes disease." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'ClinGen Validity', 'domain': 'search.clinicalgenome.org'})">ClinGen Validity</a></div>
<div><a href="https://www.ncbi.nlm.nih.gov/gtr/all/tests/?term=601105[mim]" class="mim-tip-hint" title="Genetic Testing Registry." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'GTR', 'domain': 'ncbi.nlm.nih.gov'})">GTR</a></div>
</div>
</div>
</div>
<div class="panel panel-default" style="margin-top: 0px; border-radius: 0px">
<div class="panel-heading mim-panel-heading" role="tab" id="mimVariation">
<span class="panel-title">
<span class="small">
<a href="#mimVariationLinksFold" id="mimVariationLinksToggle" class=" mimSingletonTriangleToggle" role="button" data-toggle="collapse" data-parent="#mimExternalLinksAccordion">
<span id="mimVariationLinksToggleTriangle" class="small mimSingletonTriangle" style="color: #337CB5">&#9660;</span> Variation
</a>
</span>
</span>
</div>
<div id="mimVariationLinksFold" class="panel-collapse collapse in mimLinksFold" role="tabpanel">
<div class="panel-body small mim-panel-body">
<div><a href="https://www.ncbi.nlm.nih.gov/clinvar?term=601105[MIM]" class="mim-tip-hint" title="ClinVar aggregates information about sequence variation and its relationship to human health." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">ClinVar</a></div>
<div><a href="https://www.deciphergenomics.org/gene/CTSK/overview/clinical-info" class="mim-tip-hint" title="DECIPHER" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'DECIPHER', 'domain': 'DECIPHER'})">DECIPHER</a></div>
<div><a href="https://gnomad.broadinstitute.org/gene/ENSG00000143387" class="mim-tip-hint" title="The Genome Aggregation Database (gnomAD), Broad Institute." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'gnomAD', 'domain': 'gnomad.broadinstitute.org'})">gnomAD</a></div>
<div><a href="https://www.ebi.ac.uk/gwas/search?query=CTSK" class="mim-tip-hint" title="GWAS Catalog; NHGRI-EBI Catalog of published genome-wide association studies." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'GWAS Catalog', 'domain': 'gwascatalog.org'})">GWAS Catalog&nbsp;</a></div>
<div><a href="https://www.gwascentral.org/search?q=CTSK" class="mim-tip-hint" title="GWAS Central; summary level genotype-to-phenotype information from genetic association studies." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'GWAS Central', 'domain': 'gwascentral.org'})">GWAS Central&nbsp;</a></div>
<div><a href="http://www.hgmd.cf.ac.uk/ac/gene.php?gene=CTSK" class="mim-tip-hint" title="Human Gene Mutation Database; published mutations causing or associated with human inherited disease; disease-associated/functional polymorphisms." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'HGMD', 'domain': 'hgmd.cf.ac.uk'})">HGMD</a></div>
<div><a href="http://www.fmmukq.com/boke1/showxswz.jsp?wbtreeid=1084&amp;articleid=1075&amp;doctorid=1201" class="mim-tip-hint" title="A gene-specific database of variation." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Locus Specific DB', 'domain': 'locus-specific-db.org'})">Locus Specific DBs</a></div>
<div><a href="https://evs.gs.washington.edu/EVS/PopStatsServlet?searchBy=Gene+Hugo&target=CTSK&upstreamSize=0&downstreamSize=0&x=0&y=0" class="mim-tip-hint" title="National Heart, Lung, and Blood Institute Exome Variant Server." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'NHLBI EVS', 'domain': 'evs.gs.washington.edu'})">NHLBI EVS</a></div>
<div><a href="https://www.pharmgkb.org/gene/PA27034" class="mim-tip-hint" title="Pharmacogenomics Knowledge Base; curated and annotated information regarding the effects of human genetic variations on drug response." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PharmGKB', 'domain': 'pharmgkb.org'})">PharmGKB</a></div>
</div>
</div>
</div>
<div class="panel panel-default" style="margin-top: 0px; border-radius: 0px">
<div class="panel-heading mim-panel-heading" role="tab" id="mimAnimalModels">
<span class="panel-title">
<span class="small">
<a href="#mimAnimalModelsLinksFold" id="mimAnimalModelsLinksToggle" class="collapsed mimSingletonTriangleToggle" role="button" data-toggle="collapse" data-parent="#mimExternalLinksAccordion">
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<div id="mimAnimalModelsLinksToggleTriangle" class="small mimSingletonTriangle" style="color: #337CB5; display: table-cell;">&#9658;</div>
&nbsp;
<div style="display: table-cell;">Animal Models</div>
</div>
</a>
</span>
</span>
</div>
<div id="mimAnimalModelsLinksFold" class="panel-collapse collapse mimLinksFold" role="tabpanel">
<div class="panel-body small mim-panel-body">
<div><a href="https://www.alliancegenome.org/gene/HGNC:2536" class="mim-tip-hint" title="Search Across Species; explore model organism and human comparative genomics." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Alliance Genome', 'domain': 'alliancegenome.org'})">Alliance Genome</a></div>
<div><a href="https://www.mousephenotype.org/data/genes/MGI:107823" class="mim-tip-hint" title="International Mouse Phenotyping Consortium." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'IMPC', 'domain': 'knockoutmouse.org'})">IMPC</a></div>
<div><a href="http://v1.marrvel.org/search/gene/CTSK#HomologGenesPanel" class="mim-tip-hint" title="Model organism Aggregated Resources for Rare Variant ExpLoration." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'MARRVEL', 'domain': 'marrvel.org'})">MARRVEL</a></div>
<div><a href="http://www.informatics.jax.org/marker/MGI:107823" class="mim-tip-hint" title="Mouse Genome Informatics; international database resource for the laboratory mouse, including integrated genetic, genomic, and biological data." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'MGI Mouse Gene', 'domain': 'informatics.jax.org'})">MGI Mouse Gene</a></div>
<div><a href="https://www.mmrrc.org/catalog/StrainCatalogSearchForm.php?search_query=" class="mim-tip-hint" title="Mutant Mouse Resource & Research Centers." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'MMRRC', 'domain': 'mmrrc.org'})">MMRRC</a></div>
<div><a href="https://www.ncbi.nlm.nih.gov/gene/1513/ortholog/" class="mim-tip-hint" title="Orthologous genes at NCBI." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'NCBI Orthologs', 'domain': 'ncbi.nlm.nih.gov'})">NCBI Orthologs</a></div>
<div><a href="https://omia.org/OMIA002607/" class="mim-tip-hint" title="Online Mendelian Inheritance in Animals (OMIA) is a database of genes, inherited disorders and traits in 191 animal species (other than human and mouse.)" target="_blank">OMIA</a></div>
<div><a href="https://www.orthodb.org/?ncbi=1513" class="mim-tip-hint" title="Hierarchical catalogue of orthologs." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'OrthoDB', 'domain': 'orthodb.org'})">OrthoDB</a></div>
<div><a href="mim#WormbaseGeneFold" id="mimWormbaseGeneToggle" data-toggle="collapse" class="mim-tip-hint mimTriangleToggle" title="Database of the biology and genome of Caenorhabditis elegans and related nematodes."><span id="mimWormbaseGeneToggleTriangle" class="small" style="margin-left: -0.8em;">&#9658;</span>Wormbase Gene</div>
<div id="mimWormbaseGeneFold" class="collapse">
<div style="margin-left: 0.5em;"><a href="https://wormbase.org/db/gene/gene?name=WBGene00016300;class=Gene" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Wormbase Gene', 'domain': 'wormbase.org'})">WBGene00016300&nbsp;</a></div><div style="margin-left: 0.5em;"><a href="https://wormbase.org/db/gene/gene?name=WBGene00019314;class=Gene" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Wormbase Gene', 'domain': 'wormbase.org'})">WBGene00019314&nbsp;</a></div><div style="margin-left: 0.5em;"><a href="https://wormbase.org/db/gene/gene?name=WBGene00022189;class=Gene" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Wormbase Gene', 'domain': 'wormbase.org'})">WBGene00022189&nbsp;</a></div><div style="margin-left: 0.5em;"><a href="https://wormbase.org/db/gene/gene?name=WBGene00044760;class=Gene" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Wormbase Gene', 'domain': 'wormbase.org'})">WBGene00044760&nbsp;</a></div>
</div>
<div><a href="https://zfin.org/ZDB-GENE-001205-4" class="mim-tip-hint" title="The Zebrafish Model Organism Database." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'ZFin', 'domain': 'zfin.org'})">ZFin</a></div>
</div>
</div>
</div>
<div class="panel panel-default" style="margin-top: 0px; border-radius: 0px">
<div class="panel-heading mim-panel-heading" role="tab" id="mimCellularPathways">
<span class="panel-title">
<span class="small">
<a href="#mimCellularPathwaysLinksFold" id="mimCellularPathwaysLinksToggle" class="collapsed mimSingletonTriangleToggle" role="button" data-toggle="collapse" data-parent="#mimExternalLinksAccordion">
<div style="display: table-row">
<div id="mimCellularPathwaysLinksToggleTriangle" class="small mimSingletonTriangle" style="color: #337CB5; display: table-cell;">&#9658;</div>
&nbsp;
<div style="display: table-cell;">Cellular Pathways</div>
</div>
</a>
</span>
</span>
</div>
<div id="mimCellularPathwaysLinksFold" class="panel-collapse collapse mimLinksFold" role="tabpanel">
<div class="panel-body small mim-panel-body">
<div><a href="https://www.genome.jp/dbget-bin/get_linkdb?-t+pathway+hsa:1513" class="mim-tip-hint" title="Kyoto Encyclopedia of Genes and Genomes; diagrams of signaling pathways." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'KEGG', 'domain': 'genome.jp'})">KEGG</a></div>
<div><a href="https://reactome.org/content/query?q=CTSK&species=Homo+sapiens&types=Reaction&types=Pathway&cluster=true" class="definition" title="Protein-specific information in the context of relevant cellular pathways." target="_blank" onclick="gtag('event', 'mim_outbound', {{'name': 'Reactome', 'domain': 'reactome.org'}})">Reactome</a></div>
</div>
</div>
</div>
</div>
</div>
</div>
<span>
<span class="mim-tip-bottom" qtip_title="<strong>Looking for this gene or this phenotype in other resources?</strong>" qtip_text="Select a related resource from the dropdown menu and click for a targeted link to information directly relevant.">
&nbsp;
</span>
</span>
</div>
<div class="col-lg-8 col-lg-pull-2 col-md-8 col-md-pull-2 col-sm-8 col-sm-pull-2 col-xs-12">
<div>
<a id="title" class="mim-anchor"></a>
<div>
<a id="number" class="mim-anchor"></a>
<div class="text-right">
<a href="#" class="mim-tip-icd" qtip_title="<strong>ICD+</strong>" qtip_text="
<strong>SNOMEDCT:</strong> 89647000<br />
">ICD+</a>
</div>
<div>
<span class="h3">
<span class="mim-font mim-tip-hint" title="Gene description">
<span class="text-danger"><strong>*</strong></span>
601105
</span>
</span>
</div>
</div>
<div>
<a id="preferredTitle" class="mim-anchor"></a>
<h3>
<span class="mim-font">
CATHEPSIN K; CTSK
</span>
</h3>
</div>
<div>
<br />
</div>
</div>
<div>
<a id="approvedGeneSymbols" class="mim-anchor"></a>
<p>
<span class="mim-text-font">
<strong><em>HGNC Approved Gene Symbol: <a href="https://www.genenames.org/tools/search/#!/genes?query=CTSK" class="mim-tip-hint" title="HUGO Gene Nomenclature Committee." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'HGNC', 'domain': 'genenames.org'})">CTSK</a></em></strong>
</span>
</p>
</div>
<div>
<a id="cytogeneticLocation" class="mim-anchor"></a>
<p>
<span class="mim-text-font">
<strong>
<em>
Cytogenetic location: <a href="/geneMap/1/1078?start=-3&limit=10&highlight=1078">1q21.3</a>
&nbsp;
Genomic coordinates <span class="small">(GRCh38)</span> : <a href="https://genome.ucsc.edu/cgi-bin/hgTracks?db=hg38&position=chr1:150796208-150808260&dgv=pack&knownGene=pack&omimGene=pack" class="mim-tip-hint" title="UCSC Genome Browser; reference sequences and working draft assemblies for a large collection of genomes." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'UCSC Genome Browser', 'domain': 'genome.ucsc.edu'})">1:150,796,208-150,808,260</a> </span>
</em>
</strong>
<a href="https://www.ncbi.nlm.nih.gov/" target="_blank" class="small"> (from NCBI) </a>
</span>
</p>
</div>
<div>
<br />
</div>
<div>
<a id="geneMap" class="mim-anchor"></a>
<div style="margin-bottom: 10px;">
<span class="h4 mim-font">
<strong>Gene-Phenotype Relationships</strong>
</span>
</div>
<div>
<table class="table table-bordered table-condensed table-hover small mim-table-padding">
<thead>
<tr class="active">
<th>
Location
</th>
<th>
Phenotype
</th>
<th>
Phenotype <br /> MIM number
</th>
<th>
Inheritance
</th>
<th>
Phenotype <br /> mapping key
</th>
</tr>
</thead>
<tbody>
<tr>
<td rowspan="1">
<span class="mim-font">
<a href="/geneMap/1/1078?start=-3&limit=10&highlight=1078">
1q21.3
</a>
</span>
</td>
<td>
<span class="mim-font">
Pycnodysostosis
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/265800"> 265800 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known">3</abbr>
</span>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div>
<div class="btn-group">
<button type="button" class="btn btn-success dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
PheneGene Graphics <span class="caret"></span>
</button>
<ul class="dropdown-menu" style="width: 17em;">
<li><a href="/graph/linear/601105" target="_blank" onclick="gtag('event', 'mim_graph', {'destination': 'Linear'})"> Linear </a></li>
<li><a href="/graph/radial/601105" target="_blank" onclick="gtag('event', 'mim_graph', {'destination': 'Radial'})"> Radial </a></li>
</ul>
</div>
<span class="glyphicon glyphicon-question-sign mim-tip-hint" title="OMIM PheneGene graphics depict relationships between phenotypes, groups of related phenotypes (Phenotypic Series), and genes.<br /><a href='/static/omim/pdf/OMIM_Graphics.pdf' target='_blank'>A quick reference overview and guide (PDF)</a>"></span>
</div>
<div>
<br />
</div>
<div>
<a id="text" class="mim-anchor"></a>
<h4>
<span class="mim-font">
<span class="mim-tip-floating" qtip_title="<strong>Looking For More References?</strong>" qtip_text="Click the 'reference plus' icon &lt;span class='glyphicon glyphicon-plus-sign'&gt;&lt;/span&gt at the end of each OMIM text paragraph to see more references related to the content of the preceding paragraph.">
<strong>TEXT</strong>
</span>
</span>
</h4>
<div>
<a id="description" class="mim-anchor"></a>
<h4 href="#mimDescriptionFold" id="mimDescriptionToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
<span id="mimDescriptionToggleTriangle" class="small mimTextToggleTriangle">&#9660;</span>
<span class="mim-font">
<strong>Description</strong>
</span>
</h4>
</div>
<div id="mimDescriptionFold" class="collapse in ">
<span class="mim-text-font">
<p>Cathepsin K (<a href="https://enzyme.expasy.org/EC/3.4.22.38" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'EC\', \'domain\': \'expasy.org\'})">EC 3.4.22.38</a>), a member of the papain family of cysteine proteinases, plays an important role in osteoclast function (<a href="#3" class="mim-tip-reference" title="Gelb, B. D., Shi, G.-P., Chapman, H. A., Desnick, R. J. &lt;strong&gt;Pycnodysostosis, a lysosomal disease caused by cathepsin K deficiency.&lt;/strong&gt; Science 273: 1236-1238, 1996.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8703060/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8703060&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1126/science.273.5279.1236&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="8703060">Gelb et al., 1996</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8703060" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
</span>
<div>
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</div>
<div>
<a id="cloning" class="mim-anchor"></a>
<h4 href="#mimCloningFold" id="mimCloningToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
<span id="mimCloningToggleTriangle" class="small mimTextToggleTriangle">&#9660;</span>
<span class="mim-font">
<strong>Cloning and Expression</strong>
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</h4>
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<div id="mimCloningFold" class="collapse in mimTextToggleFold">
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<p><a href="#22" class="mim-tip-reference" title="Shi, G.-P., Chapman, H. A., Bhairi, S. M., DeLeeuw, C., Reddy, V. Y., Weiss, S. J. &lt;strong&gt;Molecular cloning of human cathepsin O, a novel endoproteinase and homologue of rabbit OC2.&lt;/strong&gt; FEBS Lett. 357: 129-134, 1995.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/7805878/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;7805878&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/0014-5793(94)01349-6&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="7805878">Shi et al. (1995)</a> isolated a cysteine proteinase, the expression of which was dramatically upregulated during the in vitro maturation of peripheral blood monocytes into macrophages. Because the human macrophage-derived cDNA bore strong homology to a putative cysteine protease isolated from rabbit osteoclasts called OC2, they called the human enzyme cathepsin O (CTSO). Because this designation had been used for a different gene (see <a href="/entry/600550">600550</a>), the official name of the gene identified by <a href="#22" class="mim-tip-reference" title="Shi, G.-P., Chapman, H. A., Bhairi, S. M., DeLeeuw, C., Reddy, V. Y., Weiss, S. J. &lt;strong&gt;Molecular cloning of human cathepsin O, a novel endoproteinase and homologue of rabbit OC2.&lt;/strong&gt; FEBS Lett. 357: 129-134, 1995.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/7805878/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;7805878&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/0014-5793(94)01349-6&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="7805878">Shi et al. (1995)</a> became cathepsin K. The cathepsin K cDNA produces a single 1.7-kb transcript as detected on Northern blots of 15-day-old monocyte-derived macrophage RNA, but was not expressed in human monocytes or alveolar macrophages. The cDNA predicted a 329-amino acid preprocathepsin with more than 50% identity to both cathepsin S (CTSS; <a href="/entry/116845">116845</a>) and cathepsin L (CTSL; <a href="/entry/116880">116880</a>) of the human and 94% identity to rabbit OC2. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7805878" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#11" class="mim-tip-reference" title="Inaoka, T., Bilbe, G., Ishibashi, O., Tezuka, K., Kumegawa, M., Kokubo, T. &lt;strong&gt;Molecular cloning of human cDNA for cathepsin K: novel cysteine proteinase predominantly expressed in bone.&lt;/strong&gt; Biochem. Biophys. Res. Commun. 206: 89-96, 1995.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/7818555/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;7818555&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1006/bbrc.1995.1013&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="7818555">Inaoka et al. (1995)</a> also cloned a human cDNA for cathepsin K using a probe for the previously isolated rabbit sequence. Highest expression was noted in osteoarthritic hip bones and especially in an osteoclastoma. The authors proposed that this cathepsin may be an important component of human osteoclastic bone resorption whose pathologies include osteoporosis and osteoarthritis. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7818555" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#19" class="mim-tip-reference" title="Rantakokko, J., Aro, H. T., Savontaus, M., Vuorio, E. &lt;strong&gt;Mouse cathepsin K: cDNA cloning and predominant expression of the gene in osteoclasts, and in some hypertrophying chondrocytes during mouse development.&lt;/strong&gt; FEBS Lett. 393: 307-313, 1996.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8814310/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8814310&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/0014-5793(96)00907-6&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="8814310">Rantakokko et al. (1996)</a> used Northern blot analysis and in situ hybridization of mouse tissues to identify the specific cell types expressing cathepsin K. They found the highest levels of expression in musculoskeletal tissues: bone, cartilage, and skeletal muscle. The strongest in situ signals were seen in osteoclasts and, to a lesser extent, in some hypertrophic chondrocytes. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8814310" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
</span>
<div>
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</div>
<div>
<a id="geneStructure" class="mim-anchor"></a>
<h4 href="#mimGeneStructureFold" id="mimGeneStructureToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
<span id="mimGeneStructureToggleTriangle" class="small mimTextToggleTriangle">&#9660;</span>
<span class="mim-font">
<strong>Gene Structure</strong>
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</h4>
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<div id="mimGeneStructureFold" class="collapse in mimTextToggleFold">
<span class="mim-text-font">
<p><a href="#4" class="mim-tip-reference" title="Gelb, B. D., Shi, G.-P., Heller, M., Weremowicz, S., Morton, C., Desnick, R. J., Chapman, H. A. &lt;strong&gt;Structure and chromosomal assignment of the human cathepsin K gene.&lt;/strong&gt; Genomics 41: 258-262, 1997.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/9143502/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;9143502&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1006/geno.1997.4631&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="9143502">Gelb et al. (1997)</a> and <a href="#20" class="mim-tip-reference" title="Rood, J. A., Van Horn, S., Drake, F. H., Gowen, M., Debouck, C. &lt;strong&gt;Genomic organization and chromosome localization of the human cathepsin K gene (CTSK).&lt;/strong&gt; Genomics 41: 169-176, 1997.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/9143491/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;9143491&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1006/geno.1997.4614&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="9143491">Rood et al. (1997)</a> described the genomic organization of the CTSK gene. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=9143491+9143502" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
</span>
<div>
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</div>
</div>
<div>
<a id="mapping" class="mim-anchor"></a>
<h4 href="#mimMappingFold" id="mimMappingToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
<span id="mimMappingToggleTriangle" class="small mimTextToggleTriangle">&#9660;</span>
<span class="mim-font">
<strong>Mapping</strong>
</span>
</h4>
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<div id="mimMappingFold" class="collapse in mimTextToggleFold">
<span class="mim-text-font">
<p><a href="#4" class="mim-tip-reference" title="Gelb, B. D., Shi, G.-P., Heller, M., Weremowicz, S., Morton, C., Desnick, R. J., Chapman, H. A. &lt;strong&gt;Structure and chromosomal assignment of the human cathepsin K gene.&lt;/strong&gt; Genomics 41: 258-262, 1997.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/9143502/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;9143502&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1006/geno.1997.4631&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="9143502">Gelb et al. (1997)</a> and <a href="#20" class="mim-tip-reference" title="Rood, J. A., Van Horn, S., Drake, F. H., Gowen, M., Debouck, C. &lt;strong&gt;Genomic organization and chromosome localization of the human cathepsin K gene (CTSK).&lt;/strong&gt; Genomics 41: 169-176, 1997.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/9143491/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;9143491&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1006/geno.1997.4614&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="9143491">Rood et al. (1997)</a> mapped the CTSK gene to chromosome 1q21 by fluorescence in situ hybridization. <a href="#4" class="mim-tip-reference" title="Gelb, B. D., Shi, G.-P., Heller, M., Weremowicz, S., Morton, C., Desnick, R. J., Chapman, H. A. &lt;strong&gt;Structure and chromosomal assignment of the human cathepsin K gene.&lt;/strong&gt; Genomics 41: 258-262, 1997.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/9143502/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;9143502&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1006/geno.1997.4631&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="9143502">Gelb et al. (1997)</a> mapped CTSK within 150 kb of CTSS. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=9143491+9143502" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
</span>
<div>
<br />
</div>
</div>
<div>
<a id="geneFunction" class="mim-anchor"></a>
<h4 href="#mimGeneFunctionFold" id="mimGeneFunctionToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
<span id="mimGeneFunctionToggleTriangle" class="small mimTextToggleTriangle">&#9660;</span>
<span class="mim-font">
<strong>Gene Function</strong>
</span>
</h4>
</div>
<div id="mimGeneFunctionFold" class="collapse in mimTextToggleFold">
<span class="mim-text-font">
<p><a href="#22" class="mim-tip-reference" title="Shi, G.-P., Chapman, H. A., Bhairi, S. M., DeLeeuw, C., Reddy, V. Y., Weiss, S. J. &lt;strong&gt;Molecular cloning of human cathepsin O, a novel endoproteinase and homologue of rabbit OC2.&lt;/strong&gt; FEBS Lett. 357: 129-134, 1995.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/7805878/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;7805878&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/0014-5793(94)01349-6&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="7805878">Shi et al. (1995)</a> found that human CTSK displayed potent endoprotease activity against fibrinogen at acid pH when expressed in COS-7 cells. They speculated that this endoprotease may play a role in extracellular matrix degradation. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7805878" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#19" class="mim-tip-reference" title="Rantakokko, J., Aro, H. T., Savontaus, M., Vuorio, E. &lt;strong&gt;Mouse cathepsin K: cDNA cloning and predominant expression of the gene in osteoclasts, and in some hypertrophying chondrocytes during mouse development.&lt;/strong&gt; FEBS Lett. 393: 307-313, 1996.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8814310/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8814310&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/0014-5793(96)00907-6&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="8814310">Rantakokko et al. (1996)</a> suggested that cathepsin K is associated with the degradation of bone and cartilage. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8814310" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In addition to its high expression in osteoclasts, where it plays an essential role in the degradation of protein components of bone matrix, cathepsin K is expressed in a significant fraction of human breast cancers, where it could contribute to tumor invasiveness (<a href="#15" class="mim-tip-reference" title="Littlewood-Evans, A. J., Bilbe, G., Bowler, W. B., Farley, D., Wlodarski, B., Kokubo, T., Inaoka, T., Sloane, J., Evans, D. B., Gallagher, J. A. &lt;strong&gt;The osteoclast-associated protease cathepsin K is expressed in human breast carcinoma.&lt;/strong&gt; Cancer Res. 57: 5386-5390, 1997.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/9393764/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;9393764&lt;/a&gt;]" pmid="9393764">Littlewood-Evans et al., 1997</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=9393764" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>Using transcriptomic analysis, <a href="#13" class="mim-tip-reference" title="Kubler, A., Larsson, C., Luna, B., Andrade, B. B., Amaral, E. P., Urbanowski, M., Orandle, M., Bock, K., Ammerman, N. C., Cheung, L. S., Winglee, K., Halushka, M., Park, J. K., Sher, A., Friedland, J. S., Elkington, P. T., Bishai, W. R. &lt;strong&gt;Cathepsin K contributes to cavitation and collagen turnover in pulmonary tuberculosis.&lt;/strong&gt; J. Infect. Dis. 213: 618-626, 2016.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/26416658/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;26416658&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=26416658[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1093/infdis/jiv458&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="26416658">Kubler et al. (2016)</a> showed that several collagen-degrading proteases, including Mmp1 (<a href="/entry/120353">120353</a>), Mmp13 (<a href="/entry/600108">600108</a>), Mmp14 (<a href="/entry/600754">600754</a>), Cma1 (<a href="/entry/118938">118938</a>), and Ctsk, were highly upregulated in a rabbit cavitary tuberculosis (TB; see <a href="/entry/607948">607948</a>) model. Ctsk was the most upregulated type I collagenase in both cavitary and granulomatous tissue, as assessed by RT-PCR and immunohistochemical analysis, and the authors noted that it is unique in its ability to cleave type I collagen (see COL1A1, <a href="/entry/120150">120150</a>) inside and outside the helical region. Serum levels of CICP and free urinary deoxypyridinoline, turnover products of type I collagen, were increased, whereas urinary helical peptide was decreased, in rabbits with terminal cavities. Expression of Col1a1, Col1a2 (<a href="/entry/120160">120160</a>), and Col3a1 (<a href="/entry/120180">120180</a>) was increased in cavity wall tissue. Immunohistochemical analysis demonstrated CTSK expression in mononuclear and multinucleated giant cells at the periphery of pulmonary lesions and cavity surfaces in patients with TB. Plasma CTSK was significantly higher in patients with active TB compared with healthy controls. <a href="#13" class="mim-tip-reference" title="Kubler, A., Larsson, C., Luna, B., Andrade, B. B., Amaral, E. P., Urbanowski, M., Orandle, M., Bock, K., Ammerman, N. C., Cheung, L. S., Winglee, K., Halushka, M., Park, J. K., Sher, A., Friedland, J. S., Elkington, P. T., Bishai, W. R. &lt;strong&gt;Cathepsin K contributes to cavitation and collagen turnover in pulmonary tuberculosis.&lt;/strong&gt; J. Infect. Dis. 213: 618-626, 2016.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/26416658/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;26416658&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=26416658[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1093/infdis/jiv458&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="26416658">Kubler et al. (2016)</a> proposed that CTSK-mediated collagen degradation plays an important role in cavity formation in TB. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=26416658" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p>Pycnodysostosis (<a href="/entry/265800">265800</a>), an autosomal recessive osteochondrodysplasia characterized by osteosclerosis and short stature, maps to 1q21 in the same region as cathepsin K. In this disorder, osteoclasts, which are involved in bone resorption, are normal in numbers as are their ruffled borders and clear zones, but the region of demineralized bone surrounding individual osteoclasts is increased. Ultrastructural studies demonstrate that pycnodysostosis osteoclasts function normally in demineralizing bone but do not adequately degrade the organic matrix. Cathepsin K, a cysteine protease that is highly expressed in osteoclasts, was a logical candidate for the site of the defect in this skeletal dysplasia. <a href="#3" class="mim-tip-reference" title="Gelb, B. D., Shi, G.-P., Chapman, H. A., Desnick, R. J. &lt;strong&gt;Pycnodysostosis, a lysosomal disease caused by cathepsin K deficiency.&lt;/strong&gt; Science 273: 1236-1238, 1996.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8703060/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8703060&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1126/science.273.5279.1236&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="8703060">Gelb et al. (1996)</a> identified nonsense, missense, and stop codon mutations in the gene encoding cathepsin K in patients with pycnodysostosis. Transient expression of complementary DNA containing the stop codon mutation resulted in mRNA but no immunologically detectable protein. The findings suggested that cathepsin K is a major lysosomal protease in bone resorption, providing a possible rationale for the treatment of disorders such as osteoporosis and certain forms of arthritis. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8703060" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In affected individuals from 8 unrelated families with pycnodysostosis, <a href="#10" class="mim-tip-reference" title="Hou, W.-S., Bromme, D., Zhao, Y., Mehler, E., Dushey, C., Weinstein, H., Miranda, C. S., Fraga, C., Greig, F., Carey, J., Rimoin, D. L., Desnick, R. J., Gelb, B. D. &lt;strong&gt;Characterization of novel cathepsin K mutations in the pro and mature polypeptide regions causing pycnodysostosis.&lt;/strong&gt; J. Clin. Invest. 103: 731-738, 1999.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/10074491/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;10074491&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=10074491[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1172/JCI653&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="10074491">Hou et al. (1999)</a> identified homozygosity for 8 different mutations in the cathepsin K gene. Functional studies of mutant and wildtype enzyme suggested that the cathepsin K active site contains a critical collagen-binding domain. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10074491" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In Denmark, <a href="#8" class="mim-tip-reference" title="Haagerup, A., Hertz, J. M., Christensen, M. F., Binderup, H., Kruse, T. A. &lt;strong&gt;Cathepsin K gene mutations and 1q21 haplotypes in patients with pycnodysostosis in an outbred population.&lt;/strong&gt; Europ. J. Hum. Genet. 8: 431-436, 2000.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/10878663/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;10878663&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/sj.ejhg.5200481&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="10878663">Haagerup et al. (2000)</a> studied pycnodysostosis in 5 independent families. They found 2 new mutations and 1 previously described mutation. In 3 of the families, patients were homozygous for a 926T-C transition in exon 8, causing a leu309-to-pro amino acid substitution (<a href="#0007">601105.0007</a>). In the remaining 2 families, the patients were compound heterozygous for the 926T-C mutation and another novel mutation in each case. In a study of 150 healthy controls, <a href="#8" class="mim-tip-reference" title="Haagerup, A., Hertz, J. M., Christensen, M. F., Binderup, H., Kruse, T. A. &lt;strong&gt;Cathepsin K gene mutations and 1q21 haplotypes in patients with pycnodysostosis in an outbred population.&lt;/strong&gt; Europ. J. Hum. Genet. 8: 431-436, 2000.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/10878663/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;10878663&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/sj.ejhg.5200481&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="10878663">Haagerup et al. (2000)</a> found a frequency of 1 in 150 for the 926T-C mutation and below 1 in 300 for the other 2 mutations. One patient from each family was haplotyped with 8 microsatellite markers surrounding the cathepsin K gene on 1q21. A very rare haplotype constituted a highly conserved area around the disease locus in all patients. This haplotype was found on 7 chromosomes identical by state out of the possible 8 carrying the 926T-C mutation. Founder effect and locus homogeneity within this population were discussed. The first pregnancy and delivery in a patient with pycnodysostosis was reported. Despite the common haplotype, the 5 nuclear families could not be shown to be related on tracing 4 generations back. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10878663" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p><a href="#14" class="mim-tip-reference" title="Lazner, F., Gowen, M., Pavasovic, D., Kola, I. &lt;strong&gt;Osteopetrosis and osteoporosis: two sides of the same coin.&lt;/strong&gt; Hum. Molec. Genet. 8: 1839-1846, 1999.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/10469835/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;10469835&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1093/hmg/8.10.1839&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="10469835">Lazner et al. (1999)</a> reviewed their own work and that of others on the cathepsin K knockout mouse. Targeted mutation of the Ctsk gene in mice resulted in many of the phenotypic features of pycnodysostosis, including increased bone density and bone deformity. Radiographic analysis of these mice revealed that the phenotype also became progressively pronounced with age, as does the osteopetrosis associated with pycnodysostosis. Both the human disease and the cathepsin K knockout mouse display a bias towards abnormalities in bones that are rapidly remodeled during normal bone development and homeostasis. The bones that are more resistant to osteoporotic changes following ovariectomy and orchidectomy in mice are the same as those that do not appear to be susceptible to osteopetrosis in the cathepsin K knockout mouse and in pycnodysostosis. Splenomegaly was observed in a subset of the cathepsin K knockout mice; splenomegaly and anemia have been described in pycnodysostosis (<a href="#17" class="mim-tip-reference" title="Norman, C. H., Jr., Dubowy, J. &lt;strong&gt;Pycnodysostosis with splenomegaly and anemia.&lt;/strong&gt; NY State J. Med. 71: 2419-2421, 1971."None>Norman and Dubowy, 1971</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10469835" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>MITF (<a href="/entry/156845">156845</a>) is a member of a helix-loop-helix transcription factor subfamily, which contains the potential dimerization partners TFE3 (<a href="/entry/314310">314310</a>), TFEB (<a href="/entry/600744">600744</a>), and TFEC (<a href="/entry/604732">604732</a>). In mice, dominant-negative, but not recessive, mutations of Mitf produce osteopetrosis (see <a href="/entry/166600">166600</a>), suggesting a functional requirement for other family members. MITF also has been found--and TFE3 has been suggested--to modulate age-dependent changes in osteoclast function. There is a phenotypic similarity between microphthalmia Mitf mi/mi mutant mice and cathepsin K-null mice (<a href="#21" class="mim-tip-reference" title="Saftig, P., Hunziker, E., Wehmeyer, O., Jones, S., Boyde, A., Rommerskirch, W., Moritz, J. D., Schu, P., von Figura, K. &lt;strong&gt;Impaired osteoclastic bone resorption leads to osteopetrosis in cathepsin-K-deficient mice.&lt;/strong&gt; Proc. Nat. Acad. Sci. 95: 13453-13458, 1998.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/9811821/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;9811821&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=9811821[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1073/pnas.95.23.13453&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="9811821">Saftig et al., 1998</a>; <a href="#7" class="mim-tip-reference" title="Gowen, M., Lazner, F., Dodds, R., Kapadia, R., Feild, J., Tavaria, M., Bertoncello, I., Drake, F., Zavarselk, S., Tellis, I., Hertzog, P., Debouck, C., Kola, I. &lt;strong&gt;Cathepsin K knockout mice develop osteopetrosis due to a deficit in matrix degradation but not demineralization.&lt;/strong&gt; J. Bone Miner. Res. 14: 1654-1663, 1999.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/10491212/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;10491212&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1359/jbmr.1999.14.10.1654&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="10491212">Gowen et al., 1999</a>), as well as the human disease pycnodysostosis caused by deficiency of cathepsin K. <a href="#16" class="mim-tip-reference" title="Motyckova, G., Weilbaecher, K. N., Horstmann, M., Rieman, D. J., Fisher, D. Z., Fisher, D. E. &lt;strong&gt;Linking osteopetrosis and pycnodysostosis: regulation of cathepsin K expression by the microphthalmia transcription factor family.&lt;/strong&gt; Proc. Nat. Acad. Sci. 98: 5798-5803, 2001.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/11331755/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;11331755&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=11331755[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1073/pnas.091479298&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="11331755">Motyckova et al. (2001)</a> identified cathepsin K as a transcriptional target of MITF and TFE3 via 3 consensus elements in the cathepsin K promoter. Additionally, cathepsin K mRNA and protein were deficient in Mitf mutant osteoclasts, and overexpression in wildtype Mitf dramatically upregulated expression of endogenous cathepsin K in cultured human osteoclasts. Cathepsin K promoter activity was disrupted by dominant-negative, but not recessive, mouse alleles of Mitf in a pattern that closely matches their osteopetrotic phenotypes. This relationship between cathepsin K and the Mitf family helps explain the phenotypic overlap of their corresponding deficiencies in pycnodysostosis and osteopetrosis and identifies likely regulators of cathepsin K expression in bone homeostasis and human malignancy. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=11331755+9811821+10491212" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#2" class="mim-tip-reference" title="Chen, W., Yang, S., Abe, Y., Li, M., Wang, Y., Shao, J., Li, E., Li, Y.-P. &lt;strong&gt;Novel pycnodysostosis mouse model uncovers cathepsin K function as a potential regulator of osteoclast apoptosis and senescence.&lt;/strong&gt; Hum. Molec. Genet. 16: 410-423, 2007.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17210673/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;17210673&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=17210673[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1093/hmg/ddl474&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="17210673">Chen et al. (2007)</a> found that development of pycnodysostosis in cathepsin K -/- mice depended on the genetic background. Cathepsin K knockout in the 129/Sv inbred strain, but not in the C57BL/6J inbred strain, resulted in features that mimicked human pycnodysostosis, including short stature, osteopetrosis, acroosteolysis, bone fragility, separated cranial sutures with open fontanelles, and loss of mandibular angle. 129/Sv cathepsin K -/- mice also exhibited spondylolysis in vertebrae, thin calvarial bones, abnormal tooth development, and lack of occlusion due to an enhanced open bite. 129/Sv cathepsin K -/- mice showed significantly increased numbers of osteoclasts compared with wildtype mice, and bone resorption appeared to be downregulated in long bones and upregulated in calvaria, phalanges, and vertebrae of 129/Sv cathepsin K -/- mice. Cathepsin K knockout did not alter osteoclast-mediated extracellular acidification, but it impaired the ability of osteoclasts to degrade collagen. Cathepsin K -/- preosteoclasts were resistant to apoptosis and showed impaired senescence and an enhanced ability to tolerate passage in culture compared with wildtype preosteoclasts. Overexpression of cathepsin K initiated senescence in mouse preosteoclasts and rat osteosarcoma cells and increased expression of p19 (<a href="/entry/600160">600160</a>), p53 (<a href="/entry/191170">191170</a>), and p21 (CDKN1A; <a href="/entry/116899">116899</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17210673" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#1" class="mim-tip-reference" title="Asagiri, M., Hirai, T., Kunigami, T., Kamano, S., Gober, H.-J., Okamoto, K., Nishikawa, K., Latz, E., Golenbock, D. T., Aoki, K., Ohya, K., Imai, Y., Morishita, Y., Miyazono, K., Kato, S., Saftig, P., Takayanagi, H. &lt;strong&gt;Cathepsin K-dependent Toll-like receptor 9 signaling revealed in experimental arthritis.&lt;/strong&gt; Science 319: 624-627, 2008.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/18239127/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;18239127&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1126/science.1150110&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="18239127">Asagiri et al. (2008)</a> showed that inhibition of cathepsin K could potently suppress autoimmune inflammation of the joints as well as osteoclastic bone resorption in autoimmune arthritis. Furthermore, cathepsin K-null mice were resistant to experimental autoimmune encephalomyelitis. Pharmacologic inhibition or targeted disruption of cathepsin K resulted in defective Toll-like receptor-9 (TLR9; <a href="/entry/605474">605474</a>) signaling in dendritic cells in response to unmethylated CpG cDNA, which in turn led to attenuated induction of T helper-17 (Th17) cells without affecting the antigen-presenting ability of dendritic cells. <a href="#1" class="mim-tip-reference" title="Asagiri, M., Hirai, T., Kunigami, T., Kamano, S., Gober, H.-J., Okamoto, K., Nishikawa, K., Latz, E., Golenbock, D. T., Aoki, K., Ohya, K., Imai, Y., Morishita, Y., Miyazono, K., Kato, S., Saftig, P., Takayanagi, H. &lt;strong&gt;Cathepsin K-dependent Toll-like receptor 9 signaling revealed in experimental arthritis.&lt;/strong&gt; Science 319: 624-627, 2008.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/18239127/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;18239127&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1126/science.1150110&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="18239127">Asagiri et al. (2008)</a> suggested that cathepsin K plays an important role in the immune system and may serve as a valid therapeutic target in autoimmune diseases. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=18239127" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#23" class="mim-tip-reference" title="Yang, W., Wang, J., Moore, D. C., Liang, H., Dooner, M., Wu, Q., Terek, R., Chen, Q., Ehrlich, M. G., Quesenberry, P. J., Neel, B. G. &lt;strong&gt;Ptpn11 deletion in a novel progenitor causes metachondromatosis by inducing hedgehog signalling.&lt;/strong&gt; Nature 499: 491-495, 2013. Note: Erratum: Nature 508: 420 only, 2014.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/23863940/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;23863940&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=23863940[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/nature12396&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="23863940">Yang et al. (2013)</a> crossed conditional Ptpn11 (<a href="/entry/176876">176876</a>) knockout (Ptpn11(fl)) mice expressing Cre under the control of the endogenous lysozyme (LysM; <a href="/entry/153450">153450</a>) or cathepsin K (Ctsk) promoter. The LysM promoter is active in monocytes, macrophages, and osteoclast precursors, whereas the Ctsk promoter was thought to be active only in mature osteoclasts. While LysMCre;Ptpn11(fl/fl) mice had mild osteopetrosis, CtskCre;Ptpn11(fl/fl) mice developed features very similar to metachondromatosis (<a href="/entry/156250">156250</a>), caused by mutation in the PTPN11 gene. Lineage tracing revealed a novel population of CtskCre-expressing cells in the perichondrial groove of Ranvier that display markers and functional properties consistent with mesenchymal progenitors (Ctsk+ chondroid progenitors, or CCPs). Chondroid neoplasms arise from these cells and show decreased extracellular signal-regulated kinase (ERK) pathway activation, increased Indian hedgehog (Ihh; <a href="/entry/600726">600726</a>) and parathyroid hormone-related protein (Pthrp; <a href="/entry/168470">168470</a>) expression and excessive proliferation. Shp2-deficient chondroprogenitors had decreased fibroblast growth factor (FGF)-evoked ERK activation and enhanced Ihh and Pthrp expression, whereas fibroblast growth factor receptor (FGFR; see <a href="/entry/136350">136350</a>) or mitogen-activated protein kinase kinase (MEK; see <a href="/entry/176872">176872</a>) inhibitor treatment of chondroid cells increased Ihh and Pthrp expression. Importantly, smoothened (<a href="/entry/601500">601500</a>) inhibitor treatment ameliorated metachondromatosis features in the CtskCre;Ptpn11(fl/fl) mice. <a href="#23" class="mim-tip-reference" title="Yang, W., Wang, J., Moore, D. C., Liang, H., Dooner, M., Wu, Q., Terek, R., Chen, Q., Ehrlich, M. G., Quesenberry, P. J., Neel, B. G. &lt;strong&gt;Ptpn11 deletion in a novel progenitor causes metachondromatosis by inducing hedgehog signalling.&lt;/strong&gt; Nature 499: 491-495, 2013. Note: Erratum: Nature 508: 420 only, 2014.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/23863940/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;23863940&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=23863940[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/nature12396&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="23863940">Yang et al. (2013)</a> concluded that thus, in contrast to its prooncogenic role in hematopoietic and epithelial cells, Ptpn11 is a tumor suppressor in cartilage, acting through a FGFR/MEK/ERK-dependent pathway in a novel progenitor cell population (CCPs) to prevent excessive Ihh production. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=23863940" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<a id="allelicVariants" class="mim-anchor"></a>
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<span id="mimAllelicVariantsToggleTriangle" class="small mimTextToggleTriangle">&#9660;</span>
<strong>ALLELIC VARIANTS (<a href="/help/faq#1_4"></strong>
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<strong>7 Selected Examples</a>):</strong>
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<a href="/allelicVariants/601105" class="btn btn-default" role="button"> Table View </a>
&nbsp;&nbsp;<a href="https://www.ncbi.nlm.nih.gov/clinvar?term=601105[MIM]" class="btn btn-default mim-tip-hint" role="button" title="ClinVar aggregates information about sequence variation and its relationship to human health." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">ClinVar</a>
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<a id="0001" class="mim-anchor"></a>
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<strong>.0001&nbsp;PYCNODYSOSTOSIS</strong>
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CTSK, TER330TRP
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<div class="btn-group"> <button type="button" class="btn btn-default btn-xs dropdown-toggle mim-font" data-toggle="dropdown">rs74315301 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs74315301;toggle_HGVS_names=open" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'ensembl.org'})">Ensembl</a></li> <li><a href="https://www.ncbi.nlm.nih.gov/snp/?term=rs74315301" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'www.ncbi.nlm.nih.gov'})">NCBI</a></li> <li><a href="https://genome.ucsc.edu/cgi-bin/hgTracks?org=Human&db=hg38&clinvar=pack&omimAvSnp=pack&position=rs74315301" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'genome.ucsc.edu'})">UCSC</a></li> </ul> </div>
<span class="mim-text-font">
<a href="https://www.ncbi.nlm.nih.gov/clinvar?term=RCV000008931" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000008931" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000008931</a>
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<p>In 2 Israeli Arab pycnodysostosis (<a href="/entry/265800">265800</a>) patients, <a href="#3" class="mim-tip-reference" title="Gelb, B. D., Shi, G.-P., Chapman, H. A., Desnick, R. J. &lt;strong&gt;Pycnodysostosis, a lysosomal disease caused by cathepsin K deficiency.&lt;/strong&gt; Science 273: 1236-1238, 1996.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8703060/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8703060&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1126/science.273.5279.1236&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="8703060">Gelb et al. (1996)</a> used RT-PCR amplification and sequencing of the cathepsin K transcript from lymphoblast total RNA to demonstrate an A-to-G transition at cDNA nucleotide 1095, which predicted the substitution of the termination codon by a tryptophan residue (X330W) and the elongation of the C terminus by 19 additional amino acids. Evaluation of the X330W allele in the entire Israeli Arab pycnodysostosis family and in 43 unrelated normal Arab control individuals revealed that it cosegregated with disease in the pycnodysostosis family and was not present in any of the 86 Arab control alleles. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8703060" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<a id="0002" class="mim-anchor"></a>
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<strong>.0002&nbsp;PYCNODYSOSTOSIS</strong>
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CTSK, GLY146ARG
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<div class="btn-group"> <button type="button" class="btn btn-default btn-xs dropdown-toggle mim-font" data-toggle="dropdown"><span class="text-primary">&#x25cf;</span> rs74315302 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs74315302;toggle_HGVS_names=open" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'ensembl.org'})">Ensembl</a></li> <li><a href="https://gnomad.broadinstitute.org/variant/rs74315302?dataset=gnomad_r2_1" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'gnomad.broadinstitute.org'})" style="padding-left: 8px;"><span class="text-primary">&#x25cf;</span> gnomAD</a></li> <li><a href="https://www.ncbi.nlm.nih.gov/snp/?term=rs74315302" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'www.ncbi.nlm.nih.gov'})">NCBI</a></li> <li><a href="https://genome.ucsc.edu/cgi-bin/hgTracks?org=Human&db=hg38&clinvar=pack&omimAvSnp=pack&position=rs74315302" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'genome.ucsc.edu'})">UCSC</a></li> </ul> </div>
<span class="mim-text-font">
<a href="https://www.ncbi.nlm.nih.gov/clinvar?term=RCV000008932 OR RCV000623420 OR RCV001206530" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000008932, RCV000623420, RCV001206530" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000008932...</a>
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<p>In 2 Moroccan Arab sibs with pycnodysostosis (<a href="/entry/265800">265800</a>), <a href="#3" class="mim-tip-reference" title="Gelb, B. D., Shi, G.-P., Chapman, H. A., Desnick, R. J. &lt;strong&gt;Pycnodysostosis, a lysosomal disease caused by cathepsin K deficiency.&lt;/strong&gt; Science 273: 1236-1238, 1996.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8703060/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8703060&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1126/science.273.5279.1236&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="8703060">Gelb et al. (1996)</a> demonstrated a missense mutation, a G-to-C transversion at nucleotide 541, predicting a gly146-to-arg (G146R) substitution. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8703060" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<a id="0003" class="mim-anchor"></a>
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<strong>.0003&nbsp;PYCNODYSOSTOSIS</strong>
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CTSK, ARG241TER
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<div class="btn-group"> <button type="button" class="btn btn-default btn-xs dropdown-toggle mim-font" data-toggle="dropdown"><span class="text-primary">&#x25cf;</span> rs74315303 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs74315303;toggle_HGVS_names=open" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'ensembl.org'})">Ensembl</a></li> <li><a href="https://gnomad.broadinstitute.org/variant/rs74315303?dataset=gnomad_r2_1" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'gnomad.broadinstitute.org'})" style="padding-left: 8px;"><span class="text-primary">&#x25cf;</span> gnomAD</a></li> <li><a href="https://www.ncbi.nlm.nih.gov/snp/?term=rs74315303" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'www.ncbi.nlm.nih.gov'})">NCBI</a></li> <li><a href="https://genome.ucsc.edu/cgi-bin/hgTracks?org=Human&db=hg38&clinvar=pack&omimAvSnp=pack&position=rs74315303" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'genome.ucsc.edu'})">UCSC</a></li> </ul> </div>
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<a href="https://www.ncbi.nlm.nih.gov/clinvar?term=RCV000008933 OR RCV001036147" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000008933, RCV001036147" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000008933...</a>
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<p>In an American Hispanic pycnodysostosis (<a href="/entry/265800">265800</a>) patient with nonconsanguineous parents, <a href="#3" class="mim-tip-reference" title="Gelb, B. D., Shi, G.-P., Chapman, H. A., Desnick, R. J. &lt;strong&gt;Pycnodysostosis, a lysosomal disease caused by cathepsin K deficiency.&lt;/strong&gt; Science 273: 1236-1238, 1996.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8703060/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8703060&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1126/science.273.5279.1236&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="8703060">Gelb et al. (1996)</a> found heteroallelism for the G146R mutation (<a href="#0002">601105.0002</a>) and a C-to-T transition of a CpG dinucleotide at nucleotide 826 of their cDNA sequence, predicting an arg241-to-ter (R241X) nonsense mutation. Restriction analysis of amplified segments from genomic DNA with BamI for G146R and AvaI for R241X confirmed the RT-PCR results. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8703060" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#12" class="mim-tip-reference" title="Johnson, M. R., Polymeropoulos, M. H., Vos, H. L., Ortiz de Luna, R. I., Francomano, C. A. &lt;strong&gt;A nonsense mutation in the cathepsin K gene observed in a family with pycnodysostosis.&lt;/strong&gt; Genome Res. 6: 1050-1055, 1996.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8938428/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8938428&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1101/gr.6.11.1050&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="8938428">Johnson et al. (1996)</a> found this same mutation in homozygous state in a consanguineous Mexican kindred in which <a href="#18" class="mim-tip-reference" title="Polymeropoulos, M. H., Ortiz De Luna, R. I., Ide, S. E., Torres, R., Rubenstein, J., Francomano, C. A. &lt;strong&gt;The gene for pycnodysostosis maps to human chromosome 1cen-q21.&lt;/strong&gt; Nature Genet. 10: 238-239, 1995.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/7663522/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;7663522&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng0695-238&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="7663522">Polymeropoulos et al. (1995)</a> mapped pycnodysostosis to 1q21. <a href="#12" class="mim-tip-reference" title="Johnson, M. R., Polymeropoulos, M. H., Vos, H. L., Ortiz de Luna, R. I., Francomano, C. A. &lt;strong&gt;A nonsense mutation in the cathepsin K gene observed in a family with pycnodysostosis.&lt;/strong&gt; Genome Res. 6: 1050-1055, 1996.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8938428/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8938428&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1101/gr.6.11.1050&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="8938428">Johnson et al. (1996)</a> stated that codon 241 was affected but designated the point mutation as being at nucleotide 862 of the gene sequence they used (GenBank <a href="https://www.ncbi.nlm.nih.gov/search/all/?term=S79895" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'GENBANK\', \'domain\': \'ncbi.nlm.nih.gov\'})">S79895</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?term=8938428+7663522" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<strong>.0004&nbsp;PYCNODYSOSTOSIS</strong>
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CTSK, ALA277VAL
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<div class="btn-group"> <button type="button" class="btn btn-default btn-xs dropdown-toggle mim-font" data-toggle="dropdown"><span class="text-primary">&#x25cf;</span> rs74315304 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs74315304;toggle_HGVS_names=open" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'ensembl.org'})">Ensembl</a></li> <li><a href="https://gnomad.broadinstitute.org/variant/rs74315304?dataset=gnomad_r2_1" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'gnomad.broadinstitute.org'})" style="padding-left: 8px;"><span class="text-primary">&#x25cf;</span> gnomAD</a></li> <li><a href="https://www.ncbi.nlm.nih.gov/snp/?term=rs74315304" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'www.ncbi.nlm.nih.gov'})">NCBI</a></li> <li><a href="https://genome.ucsc.edu/cgi-bin/hgTracks?org=Human&db=hg38&clinvar=pack&omimAvSnp=pack&position=rs74315304" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'genome.ucsc.edu'})">UCSC</a></li> </ul> </div>
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<a href="https://www.ncbi.nlm.nih.gov/clinvar?term=RCV000008934" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000008934" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000008934</a>
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<p>In a 7-year-old boy with pycnodysostosis (<a href="/entry/265800">265800</a>), Gelb et al. (<a href="#6" class="mim-tip-reference" title="Gelb, B. D., Willner, J. P., Verloes, A., Herens, C., Desnick, R. J. &lt;strong&gt;Mutation analysis of pycnodysostosis reveals uniparental disomy of chromosome 1. (Abstract)&lt;/strong&gt; Am. J. Hum. Genet. 61 (suppl.): A28 only, 1997."None>1997</a>, <a href="#5" class="mim-tip-reference" title="Gelb, B. D., Willner, J. P., Dunn, T. M., Kardon, N. B., Verloes, A., Poncin, J., Desnick, R. J. &lt;strong&gt;Paternal uniparental disomy for chromosome 1 revealed by molecular analysis of a patient with pycnodysostosis.&lt;/strong&gt; Am. J. Hum. Genet. 62: 848-854, 1998.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/9529353/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;9529353&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1086/301795&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="9529353">1998</a>) identified the first example of uniparental disomy (UPD) involving chromosome 1. The child had typical features of pycnodysostosis, although he had nearly normal stature. He had idiopathic hypercalciuria, also present in the father, but no other medical problems and was developmentally normal. Informative simple tandem repeat markers (STRs), from 1q21 and later from the entire chromosome 1, showed a single paternal allele but no maternal allele in the patient. Sequencing of the cathepsin K gene in the patient revealed a C-to-T transition of nucleotide 935, predicting the substitution of an alanine by a valine at residue 277. Using an AciI site destroyed by the mutation, the patient was confirmed as a homozygote; the father was a heterozygote, and the mother was normal. The lack of an observable phenotype that could be attributed to the UPD confirmed previous predictions that human chromosome 1 is not imprinted. The UPD was thought to have resulted from nondisjunction secondary to a meiosis II error since STRs close to the centromere were homoallelic while more telomeric markers were heteroallelic. The ala277-to-val cathepsin K mutation, affecting a highly conserved residue, appeared to be a minor substitution, perhaps explaining the nearly normal stature of the patient. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=9529353" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<strong>.0005&nbsp;PYCNODYSOSTOSIS</strong>
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CTSK, GLY79GLU
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<div class="btn-group"> <button type="button" class="btn btn-default btn-xs dropdown-toggle mim-font" data-toggle="dropdown">rs74315305 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs74315305;toggle_HGVS_names=open" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'ensembl.org'})">Ensembl</a></li> <li><a href="https://www.ncbi.nlm.nih.gov/snp/?term=rs74315305" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'www.ncbi.nlm.nih.gov'})">NCBI</a></li> <li><a href="https://genome.ucsc.edu/cgi-bin/hgTracks?org=Human&db=hg38&clinvar=pack&omimAvSnp=pack&position=rs74315305" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'genome.ucsc.edu'})">UCSC</a></li> </ul> </div>
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<a href="https://www.ncbi.nlm.nih.gov/clinvar?term=RCV000008935" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000008935" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000008935</a>
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<p>In 2 sibs with pycnodysostosis (<a href="/entry/265800">265800</a>), <a href="#9" class="mim-tip-reference" title="Ho, N., Punturieri, A., Wilkin, D., Szabo, J., Johnson, M., Whaley, J., Davis, J., Clark, A., Weiss, S., Francomano, C. &lt;strong&gt;Mutations of CTSK result in pycnodysostosis via a reduction in cathepsin K protein.&lt;/strong&gt; J. Bone Miner. Res. 14: 1649-1653, 1999.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/10491211/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;10491211&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1359/jbmr.1999.14.10.1649&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="10491211">Ho et al. (1999)</a> identified compound heterozygosity for 2 mutations in the CTSK gene: a G-to-A transition at nucleotide 236, resulting in a gly79-to-glu substitution, and an A-to-T transition at nucleotide 154, resulting in a lys52-to-ter substitution (<a href="#0006">601105.0006</a>). Sequencing of genomic and cDNA from the parents demonstrated that the missense mutation was inherited from the father and the nonsense mutation from the mother. Protein expression in both affected children was virtually absent, while in the parents it was reduced by 50 to 80% compared with controls. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10491211" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<strong>.0006&nbsp;PYCNODYSOSTOSIS</strong>
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CTSK, LYS52TER
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<div class="btn-group"> <button type="button" class="btn btn-default btn-xs dropdown-toggle mim-font" data-toggle="dropdown">rs74315306 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs74315306;toggle_HGVS_names=open" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'ensembl.org'})">Ensembl</a></li> <li><a href="https://www.ncbi.nlm.nih.gov/snp/?term=rs74315306" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'www.ncbi.nlm.nih.gov'})">NCBI</a></li> <li><a href="https://genome.ucsc.edu/cgi-bin/hgTracks?org=Human&db=hg38&clinvar=pack&omimAvSnp=pack&position=rs74315306" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'genome.ucsc.edu'})">UCSC</a></li> </ul> </div>
<span class="mim-text-font">
<a href="https://www.ncbi.nlm.nih.gov/clinvar?term=RCV000008936" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000008936" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000008936</a>
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<p>For discussion of the lys52-to-ter (K52X) mutation in the CTSK gene that was found in compound heterozygous state in 2 sibs with pycnodysostosis (<a href="/entry/265800">265800</a>) by <a href="#9" class="mim-tip-reference" title="Ho, N., Punturieri, A., Wilkin, D., Szabo, J., Johnson, M., Whaley, J., Davis, J., Clark, A., Weiss, S., Francomano, C. &lt;strong&gt;Mutations of CTSK result in pycnodysostosis via a reduction in cathepsin K protein.&lt;/strong&gt; J. Bone Miner. Res. 14: 1649-1653, 1999.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/10491211/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;10491211&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1359/jbmr.1999.14.10.1649&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="10491211">Ho et al. (1999)</a>, see <a href="#0005">601105.0005</a>. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10491211" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<strong>.0007&nbsp;PYCNODYSOSTOSIS</strong>
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CTSK, LEU309PRO
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<div class="btn-group"> <button type="button" class="btn btn-default btn-xs dropdown-toggle mim-font" data-toggle="dropdown"><span class="text-primary">&#x25cf;</span> rs29001685 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs29001685;toggle_HGVS_names=open" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'ensembl.org'})">Ensembl</a></li> <li><a href="https://gnomad.broadinstitute.org/variant/rs29001685?dataset=gnomad_r2_1" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'gnomad.broadinstitute.org'})" style="padding-left: 8px;"><span class="text-primary">&#x25cf;</span> gnomAD</a></li> <li><a href="https://www.ncbi.nlm.nih.gov/snp/?term=rs29001685" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'www.ncbi.nlm.nih.gov'})">NCBI</a></li> <li><a href="https://genome.ucsc.edu/cgi-bin/hgTracks?org=Human&db=hg38&clinvar=pack&omimAvSnp=pack&position=rs29001685" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'dbSNP', 'domain': 'genome.ucsc.edu'})">UCSC</a></li> </ul> </div>
<span class="mim-text-font">
<a href="https://www.ncbi.nlm.nih.gov/clinvar?term=RCV000008937 OR RCV001851751" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000008937, RCV001851751" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000008937...</a>
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<p>Of 5 ostensibly unrelated pycnodysostosis (<a href="/entry/265800">265800</a>) families in Denmark, <a href="#8" class="mim-tip-reference" title="Haagerup, A., Hertz, J. M., Christensen, M. F., Binderup, H., Kruse, T. A. &lt;strong&gt;Cathepsin K gene mutations and 1q21 haplotypes in patients with pycnodysostosis in an outbred population.&lt;/strong&gt; Europ. J. Hum. Genet. 8: 431-436, 2000.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/10878663/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;10878663&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/sj.ejhg.5200481&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="10878663">Haagerup et al. (2000)</a> found that affected members in 3 families were homozygous for a 926T-C transition in exon 8 of the CTSK gene, resulting in a leu309-to-pro (L309P) mutation, whereas affected members in the 2 other families were compound heterozygotes with this mutation and, in each case, a second novel mutation. A very rare haplotype was found in 7 of 8 chromosomes carrying the 926T-C mutation underlying the L309P amino acid substitution. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10878663" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<strong>REFERENCES</strong>
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<a id="Asagiri2008" class="mim-anchor"></a>
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Asagiri, M., Hirai, T., Kunigami, T., Kamano, S., Gober, H.-J., Okamoto, K., Nishikawa, K., Latz, E., Golenbock, D. T., Aoki, K., Ohya, K., Imai, Y., Morishita, Y., Miyazono, K., Kato, S., Saftig, P., Takayanagi, H.
<strong>Cathepsin K-dependent Toll-like receptor 9 signaling revealed in experimental arthritis.</strong>
Science 319: 624-627, 2008.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/18239127/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">18239127</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=18239127" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1126/science.1150110" target="_blank">Full Text</a>]
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<a id="Chen2007" class="mim-anchor"></a>
<div class="">
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[<a href="https://doi.org/10.1093/hmg/ddl474" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1126/science.273.5279.1236" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1006/geno.1997.4631" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1086/301795" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1359/jbmr.1999.14.10.1654" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1038/sj.ejhg.5200481" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1359/jbmr.1999.14.10.1649" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1172/JCI653" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1006/bbrc.1995.1013" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1101/gr.6.11.1050" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1093/infdis/jiv458" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1093/hmg/8.10.1839" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1073/pnas.091479298" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1016/0014-5793(96)00907-6" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1006/geno.1997.4614" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1073/pnas.95.23.13453" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1016/0014-5793(94)01349-6" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1038/nature12396" target="_blank">Full Text</a>]
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<div class="col-lg-6 col-md-6 col-sm-6 col-xs-6">
<span class="mim-text-font">
Paul J. Converse - updated : 2/12/2016
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<div class="col-lg-offset-2 col-md-offset-4 col-sm-offset-4 col-xs-offset-2 col-lg-6 col-md-6 col-sm-6 col-xs-6">
<span class="mim-text-font">
Ada Hamosh - updated : 10/1/2013<br>Patricia A. Hartz - updated : 6/25/2010<br>Ada Hamosh - updated : 2/21/2008<br>Marla J. F. O'Neill - updated : 7/13/2005<br>Victor A. McKusick - updated : 6/1/2001<br>Victor A. McKusick - updated : 3/15/2001<br>Victor A. McKusick - updated : 1/6/2000<br>Victor A. McKusick - updated : 10/12/1999<br>Victor A. McKusick - updated : 5/12/1998<br>Victor A. McKusick - updated : 10/24/1997<br>Mark H. Paalman - edited : 10/2/1997<br>Mark H. Paalman - updated : 9/9/1997<br>Jennifer P. Macke - updated : 7/29/1997
</span>
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<div>
<a id="creationDate" class="mim-anchor"></a>
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<div class="col-lg-2 col-md-2 col-sm-4 col-xs-4">
<span class="text-nowrap mim-text-font">
Creation Date:
</span>
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<div class="col-lg-6 col-md-6 col-sm-6 col-xs-6">
<span class="mim-text-font">
Alan F. Scott : 3/6/1996
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<a id="editHistory" class="mim-anchor"></a>
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<a href="#mimCollapseEditHistory" role="button" data-toggle="collapse"> Edit History: </a>
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<div class="col-lg-6 col-md-6 col-sm-6 col-xs-6">
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carol : 09/16/2016
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<div class="col-lg-offset-2 col-md-offset-2 col-sm-offset-4 col-xs-offset-4 col-lg-6 col-md-6 col-sm-6 col-xs-6">
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carol : 08/02/2016<br>joanna : 07/01/2016<br>carol : 4/13/2016<br>mgross : 2/12/2016<br>mcolton : 8/19/2015<br>alopez : 4/25/2014<br>alopez : 10/1/2013<br>alopez : 10/1/2013<br>mgross : 7/7/2010<br>terry : 6/25/2010<br>terry : 1/20/2010<br>carol : 1/15/2009<br>carol : 2/21/2008<br>terry : 2/21/2008<br>carol : 7/15/2005<br>terry : 7/13/2005<br>mcapotos : 1/2/2002<br>mcapotos : 6/7/2001<br>mcapotos : 6/4/2001<br>terry : 6/1/2001<br>mcapotos : 3/26/2001<br>mcapotos : 3/22/2001<br>terry : 3/15/2001<br>mgross : 1/12/2000<br>terry : 1/6/2000<br>carol : 10/12/1999<br>alopez : 5/19/1998<br>terry : 5/12/1998<br>terry : 5/12/1998<br>terry : 10/28/1997<br>alopez : 10/27/1997<br>terry : 10/24/1997<br>mark : 10/2/1997<br>terry : 10/2/1997<br>jenny : 9/10/1997<br>mark : 9/9/1997<br>mark : 9/9/1997<br>terry : 7/29/1997<br>mark : 12/17/1996<br>terry : 12/17/1996<br>terry : 12/10/1996<br>mark : 8/29/1996<br>mark : 8/29/1996<br>mark : 8/28/1996<br>terry : 8/28/1996<br>joanna : 3/8/1996<br>mark : 3/6/1996
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<h3>
<span class="mim-font">
<strong>*</strong> 601105
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<h3>
<span class="mim-font">
CATHEPSIN K; CTSK
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<p>
<span class="mim-text-font">
<strong><em>HGNC Approved Gene Symbol: CTSK</em></strong>
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</p>
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<p>
<span class="mim-text-font">
<strong>SNOMEDCT:</strong> 89647000; &nbsp;
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<span class="mim-text-font">
<strong>
<em>
Cytogenetic location: 1q21.3
&nbsp;
Genomic coordinates <span class="small">(GRCh38)</span> : 1:150,796,208-150,808,260 </span>
</em>
</strong>
<span class="small">(from NCBI)</span>
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</p>
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<h4>
<span class="mim-font">
<strong>Gene-Phenotype Relationships</strong>
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<table class="table table-bordered table-condensed small mim-table-padding">
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<th>
Location
</th>
<th>
Phenotype
</th>
<th>
Phenotype <br /> MIM number
</th>
<th>
Inheritance
</th>
<th>
Phenotype <br /> mapping key
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</thead>
<tbody>
<tr>
<td rowspan="1">
<span class="mim-font">
1q21.3
</span>
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<td>
<span class="mim-font">
Pycnodysostosis
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<td>
<span class="mim-font">
265800
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<span class="mim-font">
Autosomal recessive
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<span class="mim-font">
3
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<h4>
<span class="mim-font">
<strong>TEXT</strong>
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<span class="mim-font">
<strong>Description</strong>
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<p>Cathepsin K (EC 3.4.22.38), a member of the papain family of cysteine proteinases, plays an important role in osteoclast function (Gelb et al., 1996). </p>
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<strong>Cloning and Expression</strong>
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<p>Shi et al. (1995) isolated a cysteine proteinase, the expression of which was dramatically upregulated during the in vitro maturation of peripheral blood monocytes into macrophages. Because the human macrophage-derived cDNA bore strong homology to a putative cysteine protease isolated from rabbit osteoclasts called OC2, they called the human enzyme cathepsin O (CTSO). Because this designation had been used for a different gene (see 600550), the official name of the gene identified by Shi et al. (1995) became cathepsin K. The cathepsin K cDNA produces a single 1.7-kb transcript as detected on Northern blots of 15-day-old monocyte-derived macrophage RNA, but was not expressed in human monocytes or alveolar macrophages. The cDNA predicted a 329-amino acid preprocathepsin with more than 50% identity to both cathepsin S (CTSS; 116845) and cathepsin L (CTSL; 116880) of the human and 94% identity to rabbit OC2. </p><p>Inaoka et al. (1995) also cloned a human cDNA for cathepsin K using a probe for the previously isolated rabbit sequence. Highest expression was noted in osteoarthritic hip bones and especially in an osteoclastoma. The authors proposed that this cathepsin may be an important component of human osteoclastic bone resorption whose pathologies include osteoporosis and osteoarthritis. </p><p>Rantakokko et al. (1996) used Northern blot analysis and in situ hybridization of mouse tissues to identify the specific cell types expressing cathepsin K. They found the highest levels of expression in musculoskeletal tissues: bone, cartilage, and skeletal muscle. The strongest in situ signals were seen in osteoclasts and, to a lesser extent, in some hypertrophic chondrocytes. </p>
</span>
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<h4>
<span class="mim-font">
<strong>Gene Structure</strong>
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</h4>
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<span class="mim-text-font">
<p>Gelb et al. (1997) and Rood et al. (1997) described the genomic organization of the CTSK gene. </p>
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<h4>
<span class="mim-font">
<strong>Mapping</strong>
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</h4>
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<span class="mim-text-font">
<p>Gelb et al. (1997) and Rood et al. (1997) mapped the CTSK gene to chromosome 1q21 by fluorescence in situ hybridization. Gelb et al. (1997) mapped CTSK within 150 kb of CTSS. </p>
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<h4>
<span class="mim-font">
<strong>Gene Function</strong>
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<p>Shi et al. (1995) found that human CTSK displayed potent endoprotease activity against fibrinogen at acid pH when expressed in COS-7 cells. They speculated that this endoprotease may play a role in extracellular matrix degradation. </p><p>Rantakokko et al. (1996) suggested that cathepsin K is associated with the degradation of bone and cartilage. </p><p>In addition to its high expression in osteoclasts, where it plays an essential role in the degradation of protein components of bone matrix, cathepsin K is expressed in a significant fraction of human breast cancers, where it could contribute to tumor invasiveness (Littlewood-Evans et al., 1997). </p><p>Using transcriptomic analysis, Kubler et al. (2016) showed that several collagen-degrading proteases, including Mmp1 (120353), Mmp13 (600108), Mmp14 (600754), Cma1 (118938), and Ctsk, were highly upregulated in a rabbit cavitary tuberculosis (TB; see 607948) model. Ctsk was the most upregulated type I collagenase in both cavitary and granulomatous tissue, as assessed by RT-PCR and immunohistochemical analysis, and the authors noted that it is unique in its ability to cleave type I collagen (see COL1A1, 120150) inside and outside the helical region. Serum levels of CICP and free urinary deoxypyridinoline, turnover products of type I collagen, were increased, whereas urinary helical peptide was decreased, in rabbits with terminal cavities. Expression of Col1a1, Col1a2 (120160), and Col3a1 (120180) was increased in cavity wall tissue. Immunohistochemical analysis demonstrated CTSK expression in mononuclear and multinucleated giant cells at the periphery of pulmonary lesions and cavity surfaces in patients with TB. Plasma CTSK was significantly higher in patients with active TB compared with healthy controls. Kubler et al. (2016) proposed that CTSK-mediated collagen degradation plays an important role in cavity formation in TB. </p>
</span>
<div>
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<h4>
<span class="mim-font">
<strong>Molecular Genetics</strong>
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</h4>
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<span class="mim-text-font">
<p>Pycnodysostosis (265800), an autosomal recessive osteochondrodysplasia characterized by osteosclerosis and short stature, maps to 1q21 in the same region as cathepsin K. In this disorder, osteoclasts, which are involved in bone resorption, are normal in numbers as are their ruffled borders and clear zones, but the region of demineralized bone surrounding individual osteoclasts is increased. Ultrastructural studies demonstrate that pycnodysostosis osteoclasts function normally in demineralizing bone but do not adequately degrade the organic matrix. Cathepsin K, a cysteine protease that is highly expressed in osteoclasts, was a logical candidate for the site of the defect in this skeletal dysplasia. Gelb et al. (1996) identified nonsense, missense, and stop codon mutations in the gene encoding cathepsin K in patients with pycnodysostosis. Transient expression of complementary DNA containing the stop codon mutation resulted in mRNA but no immunologically detectable protein. The findings suggested that cathepsin K is a major lysosomal protease in bone resorption, providing a possible rationale for the treatment of disorders such as osteoporosis and certain forms of arthritis. </p><p>In affected individuals from 8 unrelated families with pycnodysostosis, Hou et al. (1999) identified homozygosity for 8 different mutations in the cathepsin K gene. Functional studies of mutant and wildtype enzyme suggested that the cathepsin K active site contains a critical collagen-binding domain. </p><p>In Denmark, Haagerup et al. (2000) studied pycnodysostosis in 5 independent families. They found 2 new mutations and 1 previously described mutation. In 3 of the families, patients were homozygous for a 926T-C transition in exon 8, causing a leu309-to-pro amino acid substitution (601105.0007). In the remaining 2 families, the patients were compound heterozygous for the 926T-C mutation and another novel mutation in each case. In a study of 150 healthy controls, Haagerup et al. (2000) found a frequency of 1 in 150 for the 926T-C mutation and below 1 in 300 for the other 2 mutations. One patient from each family was haplotyped with 8 microsatellite markers surrounding the cathepsin K gene on 1q21. A very rare haplotype constituted a highly conserved area around the disease locus in all patients. This haplotype was found on 7 chromosomes identical by state out of the possible 8 carrying the 926T-C mutation. Founder effect and locus homogeneity within this population were discussed. The first pregnancy and delivery in a patient with pycnodysostosis was reported. Despite the common haplotype, the 5 nuclear families could not be shown to be related on tracing 4 generations back. </p>
</span>
<div>
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</div>
<div>
<h4>
<span class="mim-font">
<strong>Animal Model</strong>
</span>
</h4>
</div>
<span class="mim-text-font">
<p>Lazner et al. (1999) reviewed their own work and that of others on the cathepsin K knockout mouse. Targeted mutation of the Ctsk gene in mice resulted in many of the phenotypic features of pycnodysostosis, including increased bone density and bone deformity. Radiographic analysis of these mice revealed that the phenotype also became progressively pronounced with age, as does the osteopetrosis associated with pycnodysostosis. Both the human disease and the cathepsin K knockout mouse display a bias towards abnormalities in bones that are rapidly remodeled during normal bone development and homeostasis. The bones that are more resistant to osteoporotic changes following ovariectomy and orchidectomy in mice are the same as those that do not appear to be susceptible to osteopetrosis in the cathepsin K knockout mouse and in pycnodysostosis. Splenomegaly was observed in a subset of the cathepsin K knockout mice; splenomegaly and anemia have been described in pycnodysostosis (Norman and Dubowy, 1971). </p><p>MITF (156845) is a member of a helix-loop-helix transcription factor subfamily, which contains the potential dimerization partners TFE3 (314310), TFEB (600744), and TFEC (604732). In mice, dominant-negative, but not recessive, mutations of Mitf produce osteopetrosis (see 166600), suggesting a functional requirement for other family members. MITF also has been found--and TFE3 has been suggested--to modulate age-dependent changes in osteoclast function. There is a phenotypic similarity between microphthalmia Mitf mi/mi mutant mice and cathepsin K-null mice (Saftig et al., 1998; Gowen et al., 1999), as well as the human disease pycnodysostosis caused by deficiency of cathepsin K. Motyckova et al. (2001) identified cathepsin K as a transcriptional target of MITF and TFE3 via 3 consensus elements in the cathepsin K promoter. Additionally, cathepsin K mRNA and protein were deficient in Mitf mutant osteoclasts, and overexpression in wildtype Mitf dramatically upregulated expression of endogenous cathepsin K in cultured human osteoclasts. Cathepsin K promoter activity was disrupted by dominant-negative, but not recessive, mouse alleles of Mitf in a pattern that closely matches their osteopetrotic phenotypes. This relationship between cathepsin K and the Mitf family helps explain the phenotypic overlap of their corresponding deficiencies in pycnodysostosis and osteopetrosis and identifies likely regulators of cathepsin K expression in bone homeostasis and human malignancy. </p><p>Chen et al. (2007) found that development of pycnodysostosis in cathepsin K -/- mice depended on the genetic background. Cathepsin K knockout in the 129/Sv inbred strain, but not in the C57BL/6J inbred strain, resulted in features that mimicked human pycnodysostosis, including short stature, osteopetrosis, acroosteolysis, bone fragility, separated cranial sutures with open fontanelles, and loss of mandibular angle. 129/Sv cathepsin K -/- mice also exhibited spondylolysis in vertebrae, thin calvarial bones, abnormal tooth development, and lack of occlusion due to an enhanced open bite. 129/Sv cathepsin K -/- mice showed significantly increased numbers of osteoclasts compared with wildtype mice, and bone resorption appeared to be downregulated in long bones and upregulated in calvaria, phalanges, and vertebrae of 129/Sv cathepsin K -/- mice. Cathepsin K knockout did not alter osteoclast-mediated extracellular acidification, but it impaired the ability of osteoclasts to degrade collagen. Cathepsin K -/- preosteoclasts were resistant to apoptosis and showed impaired senescence and an enhanced ability to tolerate passage in culture compared with wildtype preosteoclasts. Overexpression of cathepsin K initiated senescence in mouse preosteoclasts and rat osteosarcoma cells and increased expression of p19 (600160), p53 (191170), and p21 (CDKN1A; 116899). </p><p>Asagiri et al. (2008) showed that inhibition of cathepsin K could potently suppress autoimmune inflammation of the joints as well as osteoclastic bone resorption in autoimmune arthritis. Furthermore, cathepsin K-null mice were resistant to experimental autoimmune encephalomyelitis. Pharmacologic inhibition or targeted disruption of cathepsin K resulted in defective Toll-like receptor-9 (TLR9; 605474) signaling in dendritic cells in response to unmethylated CpG cDNA, which in turn led to attenuated induction of T helper-17 (Th17) cells without affecting the antigen-presenting ability of dendritic cells. Asagiri et al. (2008) suggested that cathepsin K plays an important role in the immune system and may serve as a valid therapeutic target in autoimmune diseases. </p><p>Yang et al. (2013) crossed conditional Ptpn11 (176876) knockout (Ptpn11(fl)) mice expressing Cre under the control of the endogenous lysozyme (LysM; 153450) or cathepsin K (Ctsk) promoter. The LysM promoter is active in monocytes, macrophages, and osteoclast precursors, whereas the Ctsk promoter was thought to be active only in mature osteoclasts. While LysMCre;Ptpn11(fl/fl) mice had mild osteopetrosis, CtskCre;Ptpn11(fl/fl) mice developed features very similar to metachondromatosis (156250), caused by mutation in the PTPN11 gene. Lineage tracing revealed a novel population of CtskCre-expressing cells in the perichondrial groove of Ranvier that display markers and functional properties consistent with mesenchymal progenitors (Ctsk+ chondroid progenitors, or CCPs). Chondroid neoplasms arise from these cells and show decreased extracellular signal-regulated kinase (ERK) pathway activation, increased Indian hedgehog (Ihh; 600726) and parathyroid hormone-related protein (Pthrp; 168470) expression and excessive proliferation. Shp2-deficient chondroprogenitors had decreased fibroblast growth factor (FGF)-evoked ERK activation and enhanced Ihh and Pthrp expression, whereas fibroblast growth factor receptor (FGFR; see 136350) or mitogen-activated protein kinase kinase (MEK; see 176872) inhibitor treatment of chondroid cells increased Ihh and Pthrp expression. Importantly, smoothened (601500) inhibitor treatment ameliorated metachondromatosis features in the CtskCre;Ptpn11(fl/fl) mice. Yang et al. (2013) concluded that thus, in contrast to its prooncogenic role in hematopoietic and epithelial cells, Ptpn11 is a tumor suppressor in cartilage, acting through a FGFR/MEK/ERK-dependent pathway in a novel progenitor cell population (CCPs) to prevent excessive Ihh production. </p>
</span>
<div>
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<div>
<h4>
<span class="mim-font">
<strong>ALLELIC VARIANTS</strong>
</span>
<strong>7 Selected Examples):</strong>
</span>
</h4>
<div>
<p />
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<h4>
<span class="mim-font">
<strong>.0001 &nbsp; PYCNODYSOSTOSIS</strong>
</span>
</h4>
</div>
<div>
<span class="mim-text-font">
CTSK, TER330TRP
<br />
SNP: rs74315301,
ClinVar: RCV000008931
</span>
</div>
<div>
<span class="mim-text-font">
<p>In 2 Israeli Arab pycnodysostosis (265800) patients, Gelb et al. (1996) used RT-PCR amplification and sequencing of the cathepsin K transcript from lymphoblast total RNA to demonstrate an A-to-G transition at cDNA nucleotide 1095, which predicted the substitution of the termination codon by a tryptophan residue (X330W) and the elongation of the C terminus by 19 additional amino acids. Evaluation of the X330W allele in the entire Israeli Arab pycnodysostosis family and in 43 unrelated normal Arab control individuals revealed that it cosegregated with disease in the pycnodysostosis family and was not present in any of the 86 Arab control alleles. </p>
</span>
</div>
<div>
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<h4>
<span class="mim-font">
<strong>.0002 &nbsp; PYCNODYSOSTOSIS</strong>
</span>
</h4>
</div>
<div>
<span class="mim-text-font">
CTSK, GLY146ARG
<br />
SNP: rs74315302,
gnomAD: rs74315302,
ClinVar: RCV000008932, RCV000623420, RCV001206530
</span>
</div>
<div>
<span class="mim-text-font">
<p>In 2 Moroccan Arab sibs with pycnodysostosis (265800), Gelb et al. (1996) demonstrated a missense mutation, a G-to-C transversion at nucleotide 541, predicting a gly146-to-arg (G146R) substitution. </p>
</span>
</div>
<div>
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<div>
<div>
<h4>
<span class="mim-font">
<strong>.0003 &nbsp; PYCNODYSOSTOSIS</strong>
</span>
</h4>
</div>
<div>
<span class="mim-text-font">
CTSK, ARG241TER
<br />
SNP: rs74315303,
gnomAD: rs74315303,
ClinVar: RCV000008933, RCV001036147
</span>
</div>
<div>
<span class="mim-text-font">
<p>In an American Hispanic pycnodysostosis (265800) patient with nonconsanguineous parents, Gelb et al. (1996) found heteroallelism for the G146R mutation (601105.0002) and a C-to-T transition of a CpG dinucleotide at nucleotide 826 of their cDNA sequence, predicting an arg241-to-ter (R241X) nonsense mutation. Restriction analysis of amplified segments from genomic DNA with BamI for G146R and AvaI for R241X confirmed the RT-PCR results. </p><p>Johnson et al. (1996) found this same mutation in homozygous state in a consanguineous Mexican kindred in which Polymeropoulos et al. (1995) mapped pycnodysostosis to 1q21. Johnson et al. (1996) stated that codon 241 was affected but designated the point mutation as being at nucleotide 862 of the gene sequence they used (GenBank S79895). </p>
</span>
</div>
<div>
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</div>
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<div>
<div>
<h4>
<span class="mim-font">
<strong>.0004 &nbsp; PYCNODYSOSTOSIS</strong>
</span>
</h4>
</div>
<div>
<span class="mim-text-font">
CTSK, ALA277VAL
<br />
SNP: rs74315304,
gnomAD: rs74315304,
ClinVar: RCV000008934
</span>
</div>
<div>
<span class="mim-text-font">
<p>In a 7-year-old boy with pycnodysostosis (265800), Gelb et al. (1997, 1998) identified the first example of uniparental disomy (UPD) involving chromosome 1. The child had typical features of pycnodysostosis, although he had nearly normal stature. He had idiopathic hypercalciuria, also present in the father, but no other medical problems and was developmentally normal. Informative simple tandem repeat markers (STRs), from 1q21 and later from the entire chromosome 1, showed a single paternal allele but no maternal allele in the patient. Sequencing of the cathepsin K gene in the patient revealed a C-to-T transition of nucleotide 935, predicting the substitution of an alanine by a valine at residue 277. Using an AciI site destroyed by the mutation, the patient was confirmed as a homozygote; the father was a heterozygote, and the mother was normal. The lack of an observable phenotype that could be attributed to the UPD confirmed previous predictions that human chromosome 1 is not imprinted. The UPD was thought to have resulted from nondisjunction secondary to a meiosis II error since STRs close to the centromere were homoallelic while more telomeric markers were heteroallelic. The ala277-to-val cathepsin K mutation, affecting a highly conserved residue, appeared to be a minor substitution, perhaps explaining the nearly normal stature of the patient. </p>
</span>
</div>
<div>
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</div>
</div>
<div>
<div>
<h4>
<span class="mim-font">
<strong>.0005 &nbsp; PYCNODYSOSTOSIS</strong>
</span>
</h4>
</div>
<div>
<span class="mim-text-font">
CTSK, GLY79GLU
<br />
SNP: rs74315305,
ClinVar: RCV000008935
</span>
</div>
<div>
<span class="mim-text-font">
<p>In 2 sibs with pycnodysostosis (265800), Ho et al. (1999) identified compound heterozygosity for 2 mutations in the CTSK gene: a G-to-A transition at nucleotide 236, resulting in a gly79-to-glu substitution, and an A-to-T transition at nucleotide 154, resulting in a lys52-to-ter substitution (601105.0006). Sequencing of genomic and cDNA from the parents demonstrated that the missense mutation was inherited from the father and the nonsense mutation from the mother. Protein expression in both affected children was virtually absent, while in the parents it was reduced by 50 to 80% compared with controls. </p>
</span>
</div>
<div>
<br />
</div>
</div>
<div>
<div>
<h4>
<span class="mim-font">
<strong>.0006 &nbsp; PYCNODYSOSTOSIS</strong>
</span>
</h4>
</div>
<div>
<span class="mim-text-font">
CTSK, LYS52TER
<br />
SNP: rs74315306,
ClinVar: RCV000008936
</span>
</div>
<div>
<span class="mim-text-font">
<p>For discussion of the lys52-to-ter (K52X) mutation in the CTSK gene that was found in compound heterozygous state in 2 sibs with pycnodysostosis (265800) by Ho et al. (1999), see 601105.0005. </p>
</span>
</div>
<div>
<br />
</div>
</div>
<div>
<div>
<h4>
<span class="mim-font">
<strong>.0007 &nbsp; PYCNODYSOSTOSIS</strong>
</span>
</h4>
</div>
<div>
<span class="mim-text-font">
CTSK, LEU309PRO
<br />
SNP: rs29001685,
gnomAD: rs29001685,
ClinVar: RCV000008937, RCV001851751
</span>
</div>
<div>
<span class="mim-text-font">
<p>Of 5 ostensibly unrelated pycnodysostosis (265800) families in Denmark, Haagerup et al. (2000) found that affected members in 3 families were homozygous for a 926T-C transition in exon 8 of the CTSK gene, resulting in a leu309-to-pro (L309P) mutation, whereas affected members in the 2 other families were compound heterozygotes with this mutation and, in each case, a second novel mutation. A very rare haplotype was found in 7 of 8 chromosomes carrying the 926T-C mutation underlying the L309P amino acid substitution. </p>
</span>
</div>
<div>
<br />
</div>
</div>
</div>
<div>
<h4>
<span class="mim-font">
<strong>REFERENCES</strong>
</span>
</h4>
<div>
<p />
</div>
<div>
<ol>
<li>
<p class="mim-text-font">
Asagiri, M., Hirai, T., Kunigami, T., Kamano, S., Gober, H.-J., Okamoto, K., Nishikawa, K., Latz, E., Golenbock, D. T., Aoki, K., Ohya, K., Imai, Y., Morishita, Y., Miyazono, K., Kato, S., Saftig, P., Takayanagi, H.
<strong>Cathepsin K-dependent Toll-like receptor 9 signaling revealed in experimental arthritis.</strong>
Science 319: 624-627, 2008.
[PubMed: 18239127]
[Full Text: https://doi.org/10.1126/science.1150110]
</p>
</li>
<li>
<p class="mim-text-font">
Chen, W., Yang, S., Abe, Y., Li, M., Wang, Y., Shao, J., Li, E., Li, Y.-P.
<strong>Novel pycnodysostosis mouse model uncovers cathepsin K function as a potential regulator of osteoclast apoptosis and senescence.</strong>
Hum. Molec. Genet. 16: 410-423, 2007.
[PubMed: 17210673]
[Full Text: https://doi.org/10.1093/hmg/ddl474]
</p>
</li>
<li>
<p class="mim-text-font">
Gelb, B. D., Shi, G.-P., Chapman, H. A., Desnick, R. J.
<strong>Pycnodysostosis, a lysosomal disease caused by cathepsin K deficiency.</strong>
Science 273: 1236-1238, 1996.
[PubMed: 8703060]
[Full Text: https://doi.org/10.1126/science.273.5279.1236]
</p>
</li>
<li>
<p class="mim-text-font">
Gelb, B. D., Shi, G.-P., Heller, M., Weremowicz, S., Morton, C., Desnick, R. J., Chapman, H. A.
<strong>Structure and chromosomal assignment of the human cathepsin K gene.</strong>
Genomics 41: 258-262, 1997.
[PubMed: 9143502]
[Full Text: https://doi.org/10.1006/geno.1997.4631]
</p>
</li>
<li>
<p class="mim-text-font">
Gelb, B. D., Willner, J. P., Dunn, T. M., Kardon, N. B., Verloes, A., Poncin, J., Desnick, R. J.
<strong>Paternal uniparental disomy for chromosome 1 revealed by molecular analysis of a patient with pycnodysostosis.</strong>
Am. J. Hum. Genet. 62: 848-854, 1998.
[PubMed: 9529353]
[Full Text: https://doi.org/10.1086/301795]
</p>
</li>
<li>
<p class="mim-text-font">
Gelb, B. D., Willner, J. P., Verloes, A., Herens, C., Desnick, R. J.
<strong>Mutation analysis of pycnodysostosis reveals uniparental disomy of chromosome 1. (Abstract)</strong>
Am. J. Hum. Genet. 61 (suppl.): A28 only, 1997.
</p>
</li>
<li>
<p class="mim-text-font">
Gowen, M., Lazner, F., Dodds, R., Kapadia, R., Feild, J., Tavaria, M., Bertoncello, I., Drake, F., Zavarselk, S., Tellis, I., Hertzog, P., Debouck, C., Kola, I.
<strong>Cathepsin K knockout mice develop osteopetrosis due to a deficit in matrix degradation but not demineralization.</strong>
J. Bone Miner. Res. 14: 1654-1663, 1999.
[PubMed: 10491212]
[Full Text: https://doi.org/10.1359/jbmr.1999.14.10.1654]
</p>
</li>
<li>
<p class="mim-text-font">
Haagerup, A., Hertz, J. M., Christensen, M. F., Binderup, H., Kruse, T. A.
<strong>Cathepsin K gene mutations and 1q21 haplotypes in patients with pycnodysostosis in an outbred population.</strong>
Europ. J. Hum. Genet. 8: 431-436, 2000.
[PubMed: 10878663]
[Full Text: https://doi.org/10.1038/sj.ejhg.5200481]
</p>
</li>
<li>
<p class="mim-text-font">
Ho, N., Punturieri, A., Wilkin, D., Szabo, J., Johnson, M., Whaley, J., Davis, J., Clark, A., Weiss, S., Francomano, C.
<strong>Mutations of CTSK result in pycnodysostosis via a reduction in cathepsin K protein.</strong>
J. Bone Miner. Res. 14: 1649-1653, 1999.
[PubMed: 10491211]
[Full Text: https://doi.org/10.1359/jbmr.1999.14.10.1649]
</p>
</li>
<li>
<p class="mim-text-font">
Hou, W.-S., Bromme, D., Zhao, Y., Mehler, E., Dushey, C., Weinstein, H., Miranda, C. S., Fraga, C., Greig, F., Carey, J., Rimoin, D. L., Desnick, R. J., Gelb, B. D.
<strong>Characterization of novel cathepsin K mutations in the pro and mature polypeptide regions causing pycnodysostosis.</strong>
J. Clin. Invest. 103: 731-738, 1999.
[PubMed: 10074491]
[Full Text: https://doi.org/10.1172/JCI653]
</p>
</li>
<li>
<p class="mim-text-font">
Inaoka, T., Bilbe, G., Ishibashi, O., Tezuka, K., Kumegawa, M., Kokubo, T.
<strong>Molecular cloning of human cDNA for cathepsin K: novel cysteine proteinase predominantly expressed in bone.</strong>
Biochem. Biophys. Res. Commun. 206: 89-96, 1995.
[PubMed: 7818555]
[Full Text: https://doi.org/10.1006/bbrc.1995.1013]
</p>
</li>
<li>
<p class="mim-text-font">
Johnson, M. R., Polymeropoulos, M. H., Vos, H. L., Ortiz de Luna, R. I., Francomano, C. A.
<strong>A nonsense mutation in the cathepsin K gene observed in a family with pycnodysostosis.</strong>
Genome Res. 6: 1050-1055, 1996.
[PubMed: 8938428]
[Full Text: https://doi.org/10.1101/gr.6.11.1050]
</p>
</li>
<li>
<p class="mim-text-font">
Kubler, A., Larsson, C., Luna, B., Andrade, B. B., Amaral, E. P., Urbanowski, M., Orandle, M., Bock, K., Ammerman, N. C., Cheung, L. S., Winglee, K., Halushka, M., Park, J. K., Sher, A., Friedland, J. S., Elkington, P. T., Bishai, W. R.
<strong>Cathepsin K contributes to cavitation and collagen turnover in pulmonary tuberculosis.</strong>
J. Infect. Dis. 213: 618-626, 2016.
[PubMed: 26416658]
[Full Text: https://doi.org/10.1093/infdis/jiv458]
</p>
</li>
<li>
<p class="mim-text-font">
Lazner, F., Gowen, M., Pavasovic, D., Kola, I.
<strong>Osteopetrosis and osteoporosis: two sides of the same coin.</strong>
Hum. Molec. Genet. 8: 1839-1846, 1999.
[PubMed: 10469835]
[Full Text: https://doi.org/10.1093/hmg/8.10.1839]
</p>
</li>
<li>
<p class="mim-text-font">
Littlewood-Evans, A. J., Bilbe, G., Bowler, W. B., Farley, D., Wlodarski, B., Kokubo, T., Inaoka, T., Sloane, J., Evans, D. B., Gallagher, J. A.
<strong>The osteoclast-associated protease cathepsin K is expressed in human breast carcinoma.</strong>
Cancer Res. 57: 5386-5390, 1997.
[PubMed: 9393764]
</p>
</li>
<li>
<p class="mim-text-font">
Motyckova, G., Weilbaecher, K. N., Horstmann, M., Rieman, D. J., Fisher, D. Z., Fisher, D. E.
<strong>Linking osteopetrosis and pycnodysostosis: regulation of cathepsin K expression by the microphthalmia transcription factor family.</strong>
Proc. Nat. Acad. Sci. 98: 5798-5803, 2001.
[PubMed: 11331755]
[Full Text: https://doi.org/10.1073/pnas.091479298]
</p>
</li>
<li>
<p class="mim-text-font">
Norman, C. H., Jr., Dubowy, J.
<strong>Pycnodysostosis with splenomegaly and anemia.</strong>
NY State J. Med. 71: 2419-2421, 1971.
</p>
</li>
<li>
<p class="mim-text-font">
Polymeropoulos, M. H., Ortiz De Luna, R. I., Ide, S. E., Torres, R., Rubenstein, J., Francomano, C. A.
<strong>The gene for pycnodysostosis maps to human chromosome 1cen-q21.</strong>
Nature Genet. 10: 238-239, 1995.
[PubMed: 7663522]
[Full Text: https://doi.org/10.1038/ng0695-238]
</p>
</li>
<li>
<p class="mim-text-font">
Rantakokko, J., Aro, H. T., Savontaus, M., Vuorio, E.
<strong>Mouse cathepsin K: cDNA cloning and predominant expression of the gene in osteoclasts, and in some hypertrophying chondrocytes during mouse development.</strong>
FEBS Lett. 393: 307-313, 1996.
[PubMed: 8814310]
[Full Text: https://doi.org/10.1016/0014-5793(96)00907-6]
</p>
</li>
<li>
<p class="mim-text-font">
Rood, J. A., Van Horn, S., Drake, F. H., Gowen, M., Debouck, C.
<strong>Genomic organization and chromosome localization of the human cathepsin K gene (CTSK).</strong>
Genomics 41: 169-176, 1997.
[PubMed: 9143491]
[Full Text: https://doi.org/10.1006/geno.1997.4614]
</p>
</li>
<li>
<p class="mim-text-font">
Saftig, P., Hunziker, E., Wehmeyer, O., Jones, S., Boyde, A., Rommerskirch, W., Moritz, J. D., Schu, P., von Figura, K.
<strong>Impaired osteoclastic bone resorption leads to osteopetrosis in cathepsin-K-deficient mice.</strong>
Proc. Nat. Acad. Sci. 95: 13453-13458, 1998.
[PubMed: 9811821]
[Full Text: https://doi.org/10.1073/pnas.95.23.13453]
</p>
</li>
<li>
<p class="mim-text-font">
Shi, G.-P., Chapman, H. A., Bhairi, S. M., DeLeeuw, C., Reddy, V. Y., Weiss, S. J.
<strong>Molecular cloning of human cathepsin O, a novel endoproteinase and homologue of rabbit OC2.</strong>
FEBS Lett. 357: 129-134, 1995.
[PubMed: 7805878]
[Full Text: https://doi.org/10.1016/0014-5793(94)01349-6]
</p>
</li>
<li>
<p class="mim-text-font">
Yang, W., Wang, J., Moore, D. C., Liang, H., Dooner, M., Wu, Q., Terek, R., Chen, Q., Ehrlich, M. G., Quesenberry, P. J., Neel, B. G.
<strong>Ptpn11 deletion in a novel progenitor causes metachondromatosis by inducing hedgehog signalling.</strong>
Nature 499: 491-495, 2013. Note: Erratum: Nature 508: 420 only, 2014.
[PubMed: 23863940]
[Full Text: https://doi.org/10.1038/nature12396]
</p>
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