nih-gov/www.ncbi.nlm.nih.gov/omim/607690

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<title>
Entry
- *607690 - SECRETION-ASSOCIATED RAS-RELATED GTPase 1B; SAR1B
- OMIM
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<span class="h4">*607690</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="#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="#molecularGenetics">Molecular Genetics</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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<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=09647&isoform_id=09647_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/SAR1B" 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/5138910,7705827,12224953,12803993,14285769,33150566,48144846,62202470,62898465,75709204,119582653,119582654,193786992,2217356021,2217356023,2462602773,2462602775" 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/Q9Y6B6" 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=51128" 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=ENSG00000152700;t=ENST00000402673" 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=SAR1B" 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=SAR1B" 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+51128" 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/SAR1B" 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:51128" 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/51128" 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=chr5&hgg_gene=ENST00000402673.7&hgg_start=134601149&hgg_end=134632828&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">
<div style="display: table-row">
<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://medlineplus.gov/genetics/gene/sar1b" class="mim-tip-hint" title="Consumer-friendly information about the effects of genetic variation on human health." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'MedlinePlus Genetics', 'domain': 'medlineplus.gov'})">MedlinePlus Genetics</a></div>
<div><a href="https://www.ncbi.nlm.nih.gov/gtr/all/tests/?term=607690[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=607690[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://gnomad.broadinstitute.org/gene/ENSG00000152700" 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=SAR1B" 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=SAR1B" 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=SAR1B" 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="https://evs.gs.washington.edu/EVS/PopStatsServlet?searchBy=Gene+Hugo&target=SAR1B&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/PA34943" 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">
<div style="display: table-row">
<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:10535" 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://flybase.org/reports/FBgn0038947.html" class="mim-tip-hint" title="A Database of Drosophila Genes and Genomes." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'FlyBase', 'domain': 'flybase.org'})">FlyBase</a></div>
<div><a href="https://www.mousephenotype.org/data/genes/MGI:1913647" 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/SAR1B#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:1913647" 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/51128/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://www.orthodb.org/?ncbi=51128" 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="https://wormbase.org/db/gene/gene?name=WBGene00022678;class=Gene" class="mim-tip-hint" title="Database of the biology and genome of Caenorhabditis elegans and related nematodes." target="_blank" onclick="gtag('event', 'mim_outbound', {'name'{'name': 'Wormbase Gene', 'domain': 'wormbase.org'})">Wormbase Gene</a></div>
<div><a href="https://zfin.org/ZDB-GENE-040426-1958" 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:51128" 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=SAR1B&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> 702364003<br />
<strong>ICD10CM:</strong> E78.3<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>
607690
</span>
</span>
</div>
</div>
<div>
<a id="preferredTitle" class="mim-anchor"></a>
<h3>
<span class="mim-font">
SECRETION-ASSOCIATED RAS-RELATED GTPase 1B; SAR1B
</span>
</h3>
</div>
<div>
<br />
</div>
<div>
<a id="alternativeTitles" class="mim-anchor"></a>
<div>
<p>
<span class="mim-font">
<em>Alternative titles; symbols</em>
</span>
</p>
</div>
<div>
<h4>
<span class="mim-font">
SAR1, S. CEREVISIAE, HOMOLOG B<br />
SAR1A, S. CEREVISIAE, HOMOLOG 2; SARA2
</span>
</h4>
</div>
</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=SAR1B" class="mim-tip-hint" title="HUGO Gene Nomenclature Committee." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'HGNC', 'domain': 'genenames.org'})">SAR1B</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/5/471?start=-3&limit=10&highlight=471">5q31.1</a>
&nbsp;
Genomic coordinates <span class="small">(GRCh38)</span> : <a href="https://genome.ucsc.edu/cgi-bin/hgTracks?db=hg38&position=chr5:134601149-134632828&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'})">5:134,601,149-134,632,828</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/5/471?start=-3&limit=10&highlight=471">
5q31.1
</a>
</span>
</td>
<td>
<span class="mim-font">
Chylomicron retention disease
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/246700"> 246700 </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/607690" target="_blank" onclick="gtag('event', 'mim_graph', {'destination': 'Linear'})"> Linear </a></li>
<li><a href="/graph/radial/607690" 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="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>
</span>
</h4>
</div>
<div id="mimCloningFold" class="collapse in mimTextToggleFold">
<span class="mim-text-font">
<p>By searching databases, followed by PCR, <a href="#4" class="mim-tip-reference" title="He, H., Dai, F., Yu, L., She, X., Zhao, Y., Jiang, J., Chen, X., Zhao, S. &lt;strong&gt;Identification and characterization of nine novel human small GTPases showing variable expressions in liver cancer tissues.&lt;/strong&gt; Gene Expr. 10: 231-242, 2002.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/12450215/&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;12450215&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.3727/000000002783992406&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="12450215">He et al. (2002)</a> cloned human SAR1B, which they called SARA1. The deduced 198-amino acid SARA1 protein contains 4 highly conserved GTPase motifs. Northern blot analysis detected strong expression of a major transcript of 2.4 to 4.4 kb in all tissues examined. Smaller and larger variants were also detected in most tissues. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12450215" 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>By a genomewide screen of 6 affected families to find a gene mutant in lipid absorption disorders, <a href="#5" class="mim-tip-reference" title="Jones, B., Jones, E. L., Bonney, S. A., Patel, H. N., Mensenkamp, A. R., Eichenbaum-Voline, S., Rudling, M., Myrdal, U., Annesi, G., Naik, S., Meadows, N., Quattrone, A., and 9 others. &lt;strong&gt;Mutations in a Sar1 GTPase of COPII vesicles are associated with lipid absorption disorders.&lt;/strong&gt; Nature Genet. 34: 29-31, 2003.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/12692552/&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;12692552&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1145&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="12692552">Jones et al. (2003)</a> identified the SAR1B gene, which they called SARA2, in a region of apparent homozygosity on 5q31.1 shared by 4 affected families. SAR1B belongs to the Sar1-ADP-ribosylation factor family of small GTPases (<a href="#7" class="mim-tip-reference" title="Takai, Y., Sasaki, T., Matozaki, T. &lt;strong&gt;Small GTP-binding proteins.&lt;/strong&gt; Physiol. Rev. 81: 154-208, 2001.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/11152757/&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;11152757&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1152/physrev.2001.81.1.153&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="11152757">Takai et al., 2001</a>), which govern the intracellular trafficking of proteins in coat protein (COP)-coated vesicles (<a href="#6" class="mim-tip-reference" title="Schekman, R., Orci, L. &lt;strong&gt;Coat proteins and vesicle budding.&lt;/strong&gt; Science 271: 1526-1533, 1996.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8599108/&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;8599108&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1126/science.271.5255.1526&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="8599108">Schekman and Orci, 1996</a>). The human SARA1B protein shares 99% amino acid identity with hamster Sar1. SARA1B is expressed in many tissues including small intestine, liver, muscle, and brain. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=11152757+8599108+12692552" 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="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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<div id="mimGeneStructureFold" class="collapse in mimTextToggleFold">
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<p><a href="#4" class="mim-tip-reference" title="He, H., Dai, F., Yu, L., She, X., Zhao, Y., Jiang, J., Chen, X., Zhao, S. &lt;strong&gt;Identification and characterization of nine novel human small GTPases showing variable expressions in liver cancer tissues.&lt;/strong&gt; Gene Expr. 10: 231-242, 2002.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/12450215/&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;12450215&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.3727/000000002783992406&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="12450215">He et al. (2002)</a> determined that the SAR1B gene contains 8 exons and spans over 60 kb. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12450215" 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="#5" class="mim-tip-reference" title="Jones, B., Jones, E. L., Bonney, S. A., Patel, H. N., Mensenkamp, A. R., Eichenbaum-Voline, S., Rudling, M., Myrdal, U., Annesi, G., Naik, S., Meadows, N., Quattrone, A., and 9 others. &lt;strong&gt;Mutations in a Sar1 GTPase of COPII vesicles are associated with lipid absorption disorders.&lt;/strong&gt; Nature Genet. 34: 29-31, 2003.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/12692552/&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;12692552&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1145&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="12692552">Jones et al. (2003)</a> determined that the human SAR1B gene comprises 7 exons. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12692552" 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="mapping" class="mim-anchor"></a>
<h4 href="#mimMappingFold" id="mimMappingToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
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<strong>Mapping</strong>
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<span class="mim-text-font">
<p>By radiation hybrid analysis, <a href="#4" class="mim-tip-reference" title="He, H., Dai, F., Yu, L., She, X., Zhao, Y., Jiang, J., Chen, X., Zhao, S. &lt;strong&gt;Identification and characterization of nine novel human small GTPases showing variable expressions in liver cancer tissues.&lt;/strong&gt; Gene Expr. 10: 231-242, 2002.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/12450215/&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;12450215&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.3727/000000002783992406&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="12450215">He et al. (2002)</a> mapped the SAR1B gene to chromosome 5q23-q31.1. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12450215" 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>The SAR1B gene maps to chromosome 5q31.1, within 94 kb of the SEC24A gene (<a href="/entry/607183">607183</a>) (<a href="#5" class="mim-tip-reference" title="Jones, B., Jones, E. L., Bonney, S. A., Patel, H. N., Mensenkamp, A. R., Eichenbaum-Voline, S., Rudling, M., Myrdal, U., Annesi, G., Naik, S., Meadows, N., Quattrone, A., and 9 others. &lt;strong&gt;Mutations in a Sar1 GTPase of COPII vesicles are associated with lipid absorption disorders.&lt;/strong&gt; Nature Genet. 34: 29-31, 2003.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/12692552/&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;12692552&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1145&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="12692552">Jones et al., 2003</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12692552" 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="molecularGenetics" class="mim-anchor"></a>
<h4 href="#mimMolecularGeneticsFold" id="mimMolecularGeneticsToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
<span id="mimMolecularGeneticsToggleTriangle" class="small mimTextToggleTriangle">&#9660;</span>
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<strong>Molecular Genetics</strong>
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<span class="mim-text-font">
<p>Chylomicron retention disease (CMRD; <a href="/entry/246700">246700</a>), also known as Anderson disease, is an autosomal recessive disorder of severe fat malabsorption associated with failure to thrive in infancy. The condition is characterized by deficiency of fat-soluble vitamins, low blood cholesterol levels, and a selective absence of chylomicrons from blood. Affected individuals accumulate chylomicron-like particles in membrane-bound compartments of enterocytes, which contain large cytosolic lipid droplets. In affected members of several families with CMRD, <a href="#5" class="mim-tip-reference" title="Jones, B., Jones, E. L., Bonney, S. A., Patel, H. N., Mensenkamp, A. R., Eichenbaum-Voline, S., Rudling, M., Myrdal, U., Annesi, G., Naik, S., Meadows, N., Quattrone, A., and 9 others. &lt;strong&gt;Mutations in a Sar1 GTPase of COPII vesicles are associated with lipid absorption disorders.&lt;/strong&gt; Nature Genet. 34: 29-31, 2003.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/12692552/&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;12692552&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1145&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="12692552">Jones et al. (2003)</a> identified homozygous or compound heterozygous mutations in the SAR1B gene (<a href="#0001">607690.0001</a>-<a href="#0006">607690.0006</a>). <a href="#5" class="mim-tip-reference" title="Jones, B., Jones, E. L., Bonney, S. A., Patel, H. N., Mensenkamp, A. R., Eichenbaum-Voline, S., Rudling, M., Myrdal, U., Annesi, G., Naik, S., Meadows, N., Quattrone, A., and 9 others. &lt;strong&gt;Mutations in a Sar1 GTPase of COPII vesicles are associated with lipid absorption disorders.&lt;/strong&gt; Nature Genet. 34: 29-31, 2003.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/12692552/&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;12692552&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1145&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="12692552">Jones et al. (2003)</a> found no mutations in a second human isoform SAR1A (<a href="/entry/607691">607691</a>), located on chromosome 10, in families with these disorders. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12692552" 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="#3" class="mim-tip-reference" title="Charcosset, M., Sassolas, A., Peretti, N., Roy, C. C., Deslandres, C., Sinnett, D., Levy, E., Lachaux, A. &lt;strong&gt;Anderson or chylomicron retention disease: molecular impact of five mutations in the SAR1B gene on the structure and the functionality of Sar1b protein.&lt;/strong&gt; Molec. Genet. Metab. 93: 74-84, 2008.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17945526/&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;17945526&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/j.ymgme.2007.08.120&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="17945526">Charcosset et al. (2008)</a> identified mutations in the SAR1B gene (see, e.g., <a href="#0007">607690.0007</a>; <a href="#0008">607690.0008</a>) in families with CMRD. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17945526" 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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<strong>ALLELIC VARIANTS (<a href="/help/faq#1_4"></strong>
</span>
<strong>8 Selected Examples</a>):</strong>
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</h4>
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<div id="mimAllelicVariantsFold" class="collapse in mimTextToggleFold">
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<a href="/allelicVariants/607690" class="btn btn-default" role="button"> Table View </a>
&nbsp;&nbsp;<a href="https://www.ncbi.nlm.nih.gov/clinvar?term=607690[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>
<h4>
<span class="mim-font">
<strong>.0001&nbsp;CHYLOMICRON RETENTION DISEASE</strong>
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SAR1B, GLY37ARG
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<div class="btn-group"> <button type="button" class="btn btn-default btn-xs dropdown-toggle mim-font" data-toggle="dropdown">rs121917846 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs121917846;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=rs121917846" 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=rs121917846" 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=RCV000003056" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000003056" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000003056</a>
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<p>In 2 members of an Algerian family with chylomicron retention disease (CMRD; <a href="/entry/246700">246700</a>), <a href="#5" class="mim-tip-reference" title="Jones, B., Jones, E. L., Bonney, S. A., Patel, H. N., Mensenkamp, A. R., Eichenbaum-Voline, S., Rudling, M., Myrdal, U., Annesi, G., Naik, S., Meadows, N., Quattrone, A., and 9 others. &lt;strong&gt;Mutations in a Sar1 GTPase of COPII vesicles are associated with lipid absorption disorders.&lt;/strong&gt; Nature Genet. 34: 29-31, 2003.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/12692552/&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;12692552&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1145&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="12692552">Jones et al. (2003)</a> identified homozygosity for a 109G-A transition in the SAR1B gene that caused a gly37-to-arg (G37R) amino acid change, with the result that the protein had no affinity for GDP/GTP. Both parents were heterozygous. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12692552" 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>
<h4>
<span class="mim-font">
<strong>.0002&nbsp;CHYLOMICRON RETENTION DISEASE</strong>
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<span class="mim-text-font">
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SAR1B, ASP137ASN
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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> rs28942109 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs28942109;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/rs28942109?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=rs28942109" 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=rs28942109" 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=RCV000003057 OR RCV000725750" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000003057, RCV000725750" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000003057...</a>
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<p>In 2 white Canadian families, <a href="#5" class="mim-tip-reference" title="Jones, B., Jones, E. L., Bonney, S. A., Patel, H. N., Mensenkamp, A. R., Eichenbaum-Voline, S., Rudling, M., Myrdal, U., Annesi, G., Naik, S., Meadows, N., Quattrone, A., and 9 others. &lt;strong&gt;Mutations in a Sar1 GTPase of COPII vesicles are associated with lipid absorption disorders.&lt;/strong&gt; Nature Genet. 34: 29-31, 2003.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/12692552/&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;12692552&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1145&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="12692552">Jones et al. (2003)</a> found that affected individuals with chylomicron retention disease (CMRD; <a href="/entry/246700">246700</a>) were homozygous for a 409G-A transition in the SAR1B gene that resulted in an asp137 amino acid change (D137N) and reduced affinity of the protein for GDP/GTP. In a third white Canadian family, a single affected individual was a compound heterozygote for the D137N mutation and a deletion of 2 nucleotides, 75_76delTG (<a href="#0003">607690.0003</a>). The change occurring in leu28 resulted in frameshift and premature termination at codon 34 (Leu28fsTer34). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12692552" 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="#3" class="mim-tip-reference" title="Charcosset, M., Sassolas, A., Peretti, N., Roy, C. C., Deslandres, C., Sinnett, D., Levy, E., Lachaux, A. &lt;strong&gt;Anderson or chylomicron retention disease: molecular impact of five mutations in the SAR1B gene on the structure and the functionality of Sar1b protein.&lt;/strong&gt; Molec. Genet. Metab. 93: 74-84, 2008.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17945526/&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;17945526&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/j.ymgme.2007.08.120&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="17945526">Charcosset et al. (2008)</a> identified the D137N mutation in 3 additional French Canadian families with chylomicron retention disease. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17945526" 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>.0003&nbsp;CHYLOMICRON RETENTION DISEASE</strong>
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SAR1B, 2-BP DEL, 75TG
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<div class="btn-group"> <button type="button" class="btn btn-default btn-xs dropdown-toggle mim-font" data-toggle="dropdown">rs1580653772 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs1580653772;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=rs1580653772" 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=rs1580653772" 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=RCV000003058" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000003058" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000003058</a>
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<p>For discussion of the 2-bp deletion (75_76delTG) in the SAR1B gene, resulting in a frameshift and premature termination at codon 34 (Leu28fsTer34), that was found in compound heterozygous state in a white Canadian individual with chylomicron retention disease (CMRD; <a href="/entry/246700">246700</a>) by <a href="#5" class="mim-tip-reference" title="Jones, B., Jones, E. L., Bonney, S. A., Patel, H. N., Mensenkamp, A. R., Eichenbaum-Voline, S., Rudling, M., Myrdal, U., Annesi, G., Naik, S., Meadows, N., Quattrone, A., and 9 others. &lt;strong&gt;Mutations in a Sar1 GTPase of COPII vesicles are associated with lipid absorption disorders.&lt;/strong&gt; Nature Genet. 34: 29-31, 2003.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/12692552/&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;12692552&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1145&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="12692552">Jones et al. (2003)</a>, see <a href="#0002">607690.0002</a>. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12692552" 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;CHYLOMICRON RETENTION DISEASE</strong>
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SAR1B, SER179ARG
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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> rs28942110 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs28942110;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/rs28942110?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=rs28942110" 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=rs28942110" 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=RCV000003059 OR RCV003398425" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000003059, RCV003398425" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000003059...</a>
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<p>In a white Canadian family, <a href="#5" class="mim-tip-reference" title="Jones, B., Jones, E. L., Bonney, S. A., Patel, H. N., Mensenkamp, A. R., Eichenbaum-Voline, S., Rudling, M., Myrdal, U., Annesi, G., Naik, S., Meadows, N., Quattrone, A., and 9 others. &lt;strong&gt;Mutations in a Sar1 GTPase of COPII vesicles are associated with lipid absorption disorders.&lt;/strong&gt; Nature Genet. 34: 29-31, 2003.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/12692552/&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;12692552&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1145&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="12692552">Jones et al. (2003)</a> found that chylomicron retention disease (CMRD; <a href="/entry/246700">246700</a>) was associated with homozygosity for a ser179-to-arg (S179R) mutation arising from a 537T-A transversion in the SAR1B gene that resulted in loss of affinity of the protein for GDP/GTP. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12692552" 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="#3" class="mim-tip-reference" title="Charcosset, M., Sassolas, A., Peretti, N., Roy, C. C., Deslandres, C., Sinnett, D., Levy, E., Lachaux, A. &lt;strong&gt;Anderson or chylomicron retention disease: molecular impact of five mutations in the SAR1B gene on the structure and the functionality of Sar1b protein.&lt;/strong&gt; Molec. Genet. Metab. 93: 74-84, 2008.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17945526/&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;17945526&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/j.ymgme.2007.08.120&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="17945526">Charcosset et al. (2008)</a> identified the S179R mutation in 3 additional French Canadian families with chylomicron retention disease. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17945526" 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;CHYLOMICRON RETENTION DISEASE</strong>
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SAR1B, 4-BP DUP, 555TTAC
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<div class="btn-group"> <button type="button" class="btn btn-default btn-xs dropdown-toggle mim-font" data-toggle="dropdown">rs1580645070 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs1580645070;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=rs1580645070" 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=rs1580645070" 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=RCV000003060" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000003060" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000003060</a>
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<p>In a Turkish family, <a href="#5" class="mim-tip-reference" title="Jones, B., Jones, E. L., Bonney, S. A., Patel, H. N., Mensenkamp, A. R., Eichenbaum-Voline, S., Rudling, M., Myrdal, U., Annesi, G., Naik, S., Meadows, N., Quattrone, A., and 9 others. &lt;strong&gt;Mutations in a Sar1 GTPase of COPII vesicles are associated with lipid absorption disorders.&lt;/strong&gt; Nature Genet. 34: 29-31, 2003.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/12692552/&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;12692552&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1145&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="12692552">Jones et al. (2003)</a> demonstrated that 2 children with chylomicron retention disease (CMRD; <a href="/entry/246700">246700</a>) were homozygous for a 4-bp duplication of 555_556dupTTAC in the SAR1B gene. The mutated allele replaced amino acids 187-198 of the SARA2 protein with a new amino acid sequence. The translation was arrested after codon 198. The mutation was predicted to affect helix 6 and to cause reduced affinity for the endoplasmic reticulum (ER) membrane. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12692552" 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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<h4>
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<strong>.0006&nbsp;CHYLOMICRON RETENTION DISEASE</strong>
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SAR1B, 349, G-C, -1
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<div class="btn-group"> <button type="button" class="btn btn-default btn-xs dropdown-toggle mim-font" data-toggle="dropdown">rs1580645999 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs1580645999;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=rs1580645999" 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=rs1580645999" 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=RCV000003061" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000003061" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000003061</a>
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<p>In an Italian family in which 2 brothers had chylomicron retention disease (CMRD; <a href="/entry/246700">246700</a>) and Marinesco-Sjogren syndrome (MSS; <a href="/entry/248800">248800</a>), reported by <a href="#1" class="mim-tip-reference" title="Aguglia, U., Annesi, G., Pasquinelli, G., Spadafora, P., Gambardella, A., Annesi, F., Pasqua, A. A., Cavalcanti, F., Crescibene, L., Bagala, A., Bono, F., Oliveri, R. L., Valentino, P., Zappia, M., Quattrone, A. &lt;strong&gt;Vitamin E deficiency due to chylomicron retention disease in Marinesco-Sjogren syndrome.&lt;/strong&gt; Ann. Neurol. 47: 260-264, 2000.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/10665502/&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;10665502&lt;/a&gt;]" pmid="10665502">Aguglia et al. (2000)</a>, <a href="#5" class="mim-tip-reference" title="Jones, B., Jones, E. L., Bonney, S. A., Patel, H. N., Mensenkamp, A. R., Eichenbaum-Voline, S., Rudling, M., Myrdal, U., Annesi, G., Naik, S., Meadows, N., Quattrone, A., and 9 others. &lt;strong&gt;Mutations in a Sar1 GTPase of COPII vesicles are associated with lipid absorption disorders.&lt;/strong&gt; Nature Genet. 34: 29-31, 2003.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/12692552/&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;12692552&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1145&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="12692552">Jones et al. (2003)</a> found homozygosity for a splice site mutation in the SAR1B gene (349-1G-C). It was predicted that this mutation could cause exon skipping, activation of a nearby cryptic splice site, or production of an unspliced mRNA, any of which would substantially disrupt the protein. In the same patients, <a href="#2" class="mim-tip-reference" title="Annesi, G., Aguglia, U., Tarantino, P., Annesi, F., De Marco, E. V., Civitelli, D., Torroni, A., Quattrone, A. &lt;strong&gt;SIL1 and SARA2 mutations in Marinesco-Sjogren and chylomicron retention disease. (Letter)&lt;/strong&gt; Clin. Genet. 71: 288-289, 2007.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17309654/&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;17309654&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1111/j.1399-0004.2007.00759.x&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="17309654">Annesi et al. (2007)</a> identified a mutation in the SIL1 gene (R111X; <a href="/entry/608005#0004">608005.0004</a>), responsible for MSS. The findings indicated that the patients had 2 distinct diseases due to mutations in 2 different genes, rather than defects in a single gene leading to both disorders. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=10665502+17309654+12692552" 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;CHYLOMICRON RETENTION DISEASE</strong>
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SAR1B, GLU122TER
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&nbsp;&nbsp;
<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> rs137853125 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs137853125;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/rs137853125?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=rs137853125" 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=rs137853125" 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=RCV000003062" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000003062" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000003062</a>
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<p>In affected members of a Turkish family with chylomicron retention disease (CMRD; <a href="/entry/246700">246700</a>), <a href="#3" class="mim-tip-reference" title="Charcosset, M., Sassolas, A., Peretti, N., Roy, C. C., Deslandres, C., Sinnett, D., Levy, E., Lachaux, A. &lt;strong&gt;Anderson or chylomicron retention disease: molecular impact of five mutations in the SAR1B gene on the structure and the functionality of Sar1b protein.&lt;/strong&gt; Molec. Genet. Metab. 93: 74-84, 2008.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17945526/&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;17945526&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/j.ymgme.2007.08.120&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="17945526">Charcosset et al. (2008)</a> identified a homozygous 364G-C transversion in the SAR1B gene, resulting in a glu122-to-ter (E122X) substitution. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17945526" 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>.0008&nbsp;CHYLOMICRON RETENTION DISEASE</strong>
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SAR1B, GLY185VAL
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&nbsp;&nbsp;
<div class="btn-group"> <button type="button" class="btn btn-default btn-xs dropdown-toggle mim-font" data-toggle="dropdown">rs137853126 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs137853126;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=rs137853126" 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=rs137853126" 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=RCV000003063" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000003063" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000003063</a>
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<p>In a Portuguese child with chylomicron retention disease (CMRD; <a href="/entry/246700">246700</a>), <a href="#3" class="mim-tip-reference" title="Charcosset, M., Sassolas, A., Peretti, N., Roy, C. C., Deslandres, C., Sinnett, D., Levy, E., Lachaux, A. &lt;strong&gt;Anderson or chylomicron retention disease: molecular impact of five mutations in the SAR1B gene on the structure and the functionality of Sar1b protein.&lt;/strong&gt; Molec. Genet. Metab. 93: 74-84, 2008.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17945526/&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;17945526&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/j.ymgme.2007.08.120&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="17945526">Charcosset et al. (2008)</a> identified a homozygous 554G-T transversion in the SAR1B gene, resulting in a gly185-to-val (G185V) substitution. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17945526" 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="references"class="mim-anchor"></a>
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<span id="mimReferencesToggleTriangle" class="small mimTextToggleTriangle">&#9660;</span>
<strong>REFERENCES</strong>
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<a id="1" class="mim-anchor"></a>
<a id="Aguglia2000" class="mim-anchor"></a>
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Aguglia, U., Annesi, G., Pasquinelli, G., Spadafora, P., Gambardella, A., Annesi, F., Pasqua, A. A., Cavalcanti, F., Crescibene, L., Bagala, A., Bono, F., Oliveri, R. L., Valentino, P., Zappia, M., Quattrone, A.
<strong>Vitamin E deficiency due to chylomicron retention disease in Marinesco-Sjogren syndrome.</strong>
Ann. Neurol. 47: 260-264, 2000.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/10665502/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">10665502</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10665502" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
</p>
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<a id="2" class="mim-anchor"></a>
<a id="Annesi2007" class="mim-anchor"></a>
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<p class="mim-text-font">
Annesi, G., Aguglia, U., Tarantino, P., Annesi, F., De Marco, E. V., Civitelli, D., Torroni, A., Quattrone, A.
<strong>SIL1 and SARA2 mutations in Marinesco-Sjogren and chylomicron retention disease. (Letter)</strong>
Clin. Genet. 71: 288-289, 2007.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/17309654/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">17309654</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17309654" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1111/j.1399-0004.2007.00759.x" target="_blank">Full Text</a>]
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<a id="3" class="mim-anchor"></a>
<a id="Charcosset2008" class="mim-anchor"></a>
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<p class="mim-text-font">
Charcosset, M., Sassolas, A., Peretti, N., Roy, C. C., Deslandres, C., Sinnett, D., Levy, E., Lachaux, A.
<strong>Anderson or chylomicron retention disease: molecular impact of five mutations in the SAR1B gene on the structure and the functionality of Sar1b protein.</strong>
Molec. Genet. Metab. 93: 74-84, 2008.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/17945526/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">17945526</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17945526" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1016/j.ymgme.2007.08.120" target="_blank">Full Text</a>]
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<a id="He2002" class="mim-anchor"></a>
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He, H., Dai, F., Yu, L., She, X., Zhao, Y., Jiang, J., Chen, X., Zhao, S.
<strong>Identification and characterization of nine novel human small GTPases showing variable expressions in liver cancer tissues.</strong>
Gene Expr. 10: 231-242, 2002.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/12450215/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">12450215</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12450215" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.3727/000000002783992406" target="_blank">Full Text</a>]
</p>
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<a id="Jones2003" class="mim-anchor"></a>
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Jones, B., Jones, E. L., Bonney, S. A., Patel, H. N., Mensenkamp, A. R., Eichenbaum-Voline, S., Rudling, M., Myrdal, U., Annesi, G., Naik, S., Meadows, N., Quattrone, A., and 9 others.
<strong>Mutations in a Sar1 GTPase of COPII vesicles are associated with lipid absorption disorders.</strong>
Nature Genet. 34: 29-31, 2003.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/12692552/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">12692552</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12692552" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1038/ng1145" target="_blank">Full Text</a>]
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<a id="Schekman1996" class="mim-anchor"></a>
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Schekman, R., Orci, L.
<strong>Coat proteins and vesicle budding.</strong>
Science 271: 1526-1533, 1996.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8599108/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8599108</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8599108" 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.271.5255.1526" target="_blank">Full Text</a>]
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<a id="Takai2001" class="mim-anchor"></a>
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Takai, Y., Sasaki, T., Matozaki, T.
<strong>Small GTP-binding proteins.</strong>
Physiol. Rev. 81: 154-208, 2001.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/11152757/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">11152757</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=11152757" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1152/physrev.2001.81.1.153" target="_blank">Full Text</a>]
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<a href="#mimCollapseContributors" role="button" data-toggle="collapse"> Contributors: </a>
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<div class="col-lg-6 col-md-6 col-sm-6 col-xs-6">
<span class="mim-text-font">
Patricia A. Hartz - updated : 7/23/2009
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<span class="mim-text-font">
Cassandra L. Kniffin - updated : 2/23/2009<br>Cassandra L. Kniffin - updated : 8/29/2007
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Creation Date:
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<span class="mim-text-font">
Victor A. McKusick : 4/15/2003
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<a href="#mimCollapseEditHistory" role="button" data-toggle="collapse"> Edit History: </a>
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carol : 12/30/2019
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carol : 06/11/2018<br>carol : 02/17/2014<br>mgross : 8/18/2009<br>terry : 7/23/2009<br>wwang : 4/2/2009<br>ckniffin : 2/23/2009<br>wwang : 9/11/2007<br>ckniffin : 8/29/2007<br>terry : 7/24/2003<br>alopez : 4/30/2003<br>alopez : 4/15/2003
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<strong>*</strong> 607690
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<span class="mim-font">
SECRETION-ASSOCIATED RAS-RELATED GTPase 1B; SAR1B
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<span class="mim-font">
<em>Alternative titles; symbols</em>
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SAR1, S. CEREVISIAE, HOMOLOG B<br />
SAR1A, S. CEREVISIAE, HOMOLOG 2; SARA2
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<strong><em>HGNC Approved Gene Symbol: SAR1B</em></strong>
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<strong>SNOMEDCT:</strong> 702364003; &nbsp;
<strong>ICD10CM:</strong> E78.3; &nbsp;
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<strong>
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Cytogenetic location: 5q31.1
&nbsp;
Genomic coordinates <span class="small">(GRCh38)</span> : 5:134,601,149-134,632,828 </span>
</em>
</strong>
<span class="small">(from NCBI)</span>
</span>
</p>
</div>
<div>
<br />
</div>
<div>
<h4>
<span class="mim-font">
<strong>Gene-Phenotype Relationships</strong>
</span>
</h4>
<div>
<table class="table table-bordered table-condensed 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">
5q31.1
</span>
</td>
<td>
<span class="mim-font">
Chylomicron retention disease
</span>
</td>
<td>
<span class="mim-font">
246700
</span>
</td>
<td>
<span class="mim-font">
Autosomal recessive
</span>
</td>
<td>
<span class="mim-font">
3
</span>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div>
<br />
</div>
<div>
<h4>
<span class="mim-font">
<strong>TEXT</strong>
</span>
</h4>
<div>
<h4>
<span class="mim-font">
<strong>Cloning and Expression</strong>
</span>
</h4>
</div>
<span class="mim-text-font">
<p>By searching databases, followed by PCR, He et al. (2002) cloned human SAR1B, which they called SARA1. The deduced 198-amino acid SARA1 protein contains 4 highly conserved GTPase motifs. Northern blot analysis detected strong expression of a major transcript of 2.4 to 4.4 kb in all tissues examined. Smaller and larger variants were also detected in most tissues. </p><p>By a genomewide screen of 6 affected families to find a gene mutant in lipid absorption disorders, Jones et al. (2003) identified the SAR1B gene, which they called SARA2, in a region of apparent homozygosity on 5q31.1 shared by 4 affected families. SAR1B belongs to the Sar1-ADP-ribosylation factor family of small GTPases (Takai et al., 2001), which govern the intracellular trafficking of proteins in coat protein (COP)-coated vesicles (Schekman and Orci, 1996). The human SARA1B protein shares 99% amino acid identity with hamster Sar1. SARA1B is expressed in many tissues including small intestine, liver, muscle, and brain. </p>
</span>
<div>
<br />
</div>
<div>
<h4>
<span class="mim-font">
<strong>Gene Structure</strong>
</span>
</h4>
</div>
<span class="mim-text-font">
<p>He et al. (2002) determined that the SAR1B gene contains 8 exons and spans over 60 kb. </p><p>Jones et al. (2003) determined that the human SAR1B gene comprises 7 exons. </p>
</span>
<div>
<br />
</div>
<div>
<h4>
<span class="mim-font">
<strong>Mapping</strong>
</span>
</h4>
</div>
<span class="mim-text-font">
<p>By radiation hybrid analysis, He et al. (2002) mapped the SAR1B gene to chromosome 5q23-q31.1. </p><p>The SAR1B gene maps to chromosome 5q31.1, within 94 kb of the SEC24A gene (607183) (Jones et al., 2003). </p>
</span>
<div>
<br />
</div>
<div>
<h4>
<span class="mim-font">
<strong>Molecular Genetics</strong>
</span>
</h4>
</div>
<span class="mim-text-font">
<p>Chylomicron retention disease (CMRD; 246700), also known as Anderson disease, is an autosomal recessive disorder of severe fat malabsorption associated with failure to thrive in infancy. The condition is characterized by deficiency of fat-soluble vitamins, low blood cholesterol levels, and a selective absence of chylomicrons from blood. Affected individuals accumulate chylomicron-like particles in membrane-bound compartments of enterocytes, which contain large cytosolic lipid droplets. In affected members of several families with CMRD, Jones et al. (2003) identified homozygous or compound heterozygous mutations in the SAR1B gene (607690.0001-607690.0006). Jones et al. (2003) found no mutations in a second human isoform SAR1A (607691), located on chromosome 10, in families with these disorders. </p><p>Charcosset et al. (2008) identified mutations in the SAR1B gene (see, e.g., 607690.0007; 607690.0008) in families with CMRD. </p>
</span>
<div>
<br />
</div>
</div>
<div>
<h4>
<span class="mim-font">
<strong>ALLELIC VARIANTS</strong>
</span>
<strong>8 Selected Examples):</strong>
</span>
</h4>
<div>
<p />
</div>
<div>
<div>
<h4>
<span class="mim-font">
<strong>.0001 &nbsp; CHYLOMICRON RETENTION DISEASE</strong>
</span>
</h4>
</div>
<div>
<span class="mim-text-font">
SAR1B, GLY37ARG
<br />
SNP: rs121917846,
ClinVar: RCV000003056
</span>
</div>
<div>
<span class="mim-text-font">
<p>In 2 members of an Algerian family with chylomicron retention disease (CMRD; 246700), Jones et al. (2003) identified homozygosity for a 109G-A transition in the SAR1B gene that caused a gly37-to-arg (G37R) amino acid change, with the result that the protein had no affinity for GDP/GTP. Both parents were heterozygous. </p>
</span>
</div>
<div>
<br />
</div>
</div>
<div>
<div>
<h4>
<span class="mim-font">
<strong>.0002 &nbsp; CHYLOMICRON RETENTION DISEASE</strong>
</span>
</h4>
</div>
<div>
<span class="mim-text-font">
SAR1B, ASP137ASN
<br />
SNP: rs28942109,
gnomAD: rs28942109,
ClinVar: RCV000003057, RCV000725750
</span>
</div>
<div>
<span class="mim-text-font">
<p>In 2 white Canadian families, Jones et al. (2003) found that affected individuals with chylomicron retention disease (CMRD; 246700) were homozygous for a 409G-A transition in the SAR1B gene that resulted in an asp137 amino acid change (D137N) and reduced affinity of the protein for GDP/GTP. In a third white Canadian family, a single affected individual was a compound heterozygote for the D137N mutation and a deletion of 2 nucleotides, 75_76delTG (607690.0003). The change occurring in leu28 resulted in frameshift and premature termination at codon 34 (Leu28fsTer34). </p><p>Charcosset et al. (2008) identified the D137N mutation in 3 additional French Canadian families with chylomicron retention disease. </p>
</span>
</div>
<div>
<br />
</div>
</div>
<div>
<div>
<h4>
<span class="mim-font">
<strong>.0003 &nbsp; CHYLOMICRON RETENTION DISEASE</strong>
</span>
</h4>
</div>
<div>
<span class="mim-text-font">
SAR1B, 2-BP DEL, 75TG
<br />
SNP: rs1580653772,
ClinVar: RCV000003058
</span>
</div>
<div>
<span class="mim-text-font">
<p>For discussion of the 2-bp deletion (75_76delTG) in the SAR1B gene, resulting in a frameshift and premature termination at codon 34 (Leu28fsTer34), that was found in compound heterozygous state in a white Canadian individual with chylomicron retention disease (CMRD; 246700) by Jones et al. (2003), see 607690.0002. </p>
</span>
</div>
<div>
<br />
</div>
</div>
<div>
<div>
<h4>
<span class="mim-font">
<strong>.0004 &nbsp; CHYLOMICRON RETENTION DISEASE</strong>
</span>
</h4>
</div>
<div>
<span class="mim-text-font">
SAR1B, SER179ARG
<br />
SNP: rs28942110,
gnomAD: rs28942110,
ClinVar: RCV000003059, RCV003398425
</span>
</div>
<div>
<span class="mim-text-font">
<p>In a white Canadian family, Jones et al. (2003) found that chylomicron retention disease (CMRD; 246700) was associated with homozygosity for a ser179-to-arg (S179R) mutation arising from a 537T-A transversion in the SAR1B gene that resulted in loss of affinity of the protein for GDP/GTP. </p><p>Charcosset et al. (2008) identified the S179R mutation in 3 additional French Canadian families with chylomicron retention disease. </p>
</span>
</div>
<div>
<br />
</div>
</div>
<div>
<div>
<h4>
<span class="mim-font">
<strong>.0005 &nbsp; CHYLOMICRON RETENTION DISEASE</strong>
</span>
</h4>
</div>
<div>
<span class="mim-text-font">
SAR1B, 4-BP DUP, 555TTAC
<br />
SNP: rs1580645070,
ClinVar: RCV000003060
</span>
</div>
<div>
<span class="mim-text-font">
<p>In a Turkish family, Jones et al. (2003) demonstrated that 2 children with chylomicron retention disease (CMRD; 246700) were homozygous for a 4-bp duplication of 555_556dupTTAC in the SAR1B gene. The mutated allele replaced amino acids 187-198 of the SARA2 protein with a new amino acid sequence. The translation was arrested after codon 198. The mutation was predicted to affect helix 6 and to cause reduced affinity for the endoplasmic reticulum (ER) membrane. </p>
</span>
</div>
<div>
<br />
</div>
</div>
<div>
<div>
<h4>
<span class="mim-font">
<strong>.0006 &nbsp; CHYLOMICRON RETENTION DISEASE</strong>
</span>
</h4>
</div>
<div>
<span class="mim-text-font">
SAR1B, 349, G-C, -1
<br />
SNP: rs1580645999,
ClinVar: RCV000003061
</span>
</div>
<div>
<span class="mim-text-font">
<p>In an Italian family in which 2 brothers had chylomicron retention disease (CMRD; 246700) and Marinesco-Sjogren syndrome (MSS; 248800), reported by Aguglia et al. (2000), Jones et al. (2003) found homozygosity for a splice site mutation in the SAR1B gene (349-1G-C). It was predicted that this mutation could cause exon skipping, activation of a nearby cryptic splice site, or production of an unspliced mRNA, any of which would substantially disrupt the protein. In the same patients, Annesi et al. (2007) identified a mutation in the SIL1 gene (R111X; 608005.0004), responsible for MSS. The findings indicated that the patients had 2 distinct diseases due to mutations in 2 different genes, rather than defects in a single gene leading to both disorders. </p>
</span>
</div>
<div>
<br />
</div>
</div>
<div>
<div>
<h4>
<span class="mim-font">
<strong>.0007 &nbsp; CHYLOMICRON RETENTION DISEASE</strong>
</span>
</h4>
</div>
<div>
<span class="mim-text-font">
SAR1B, GLU122TER
<br />
SNP: rs137853125,
gnomAD: rs137853125,
ClinVar: RCV000003062
</span>
</div>
<div>
<span class="mim-text-font">
<p>In affected members of a Turkish family with chylomicron retention disease (CMRD; 246700), Charcosset et al. (2008) identified a homozygous 364G-C transversion in the SAR1B gene, resulting in a glu122-to-ter (E122X) substitution. </p>
</span>
</div>
<div>
<br />
</div>
</div>
<div>
<div>
<h4>
<span class="mim-font">
<strong>.0008 &nbsp; CHYLOMICRON RETENTION DISEASE</strong>
</span>
</h4>
</div>
<div>
<span class="mim-text-font">
SAR1B, GLY185VAL
<br />
SNP: rs137853126,
ClinVar: RCV000003063
</span>
</div>
<div>
<span class="mim-text-font">
<p>In a Portuguese child with chylomicron retention disease (CMRD; 246700), Charcosset et al. (2008) identified a homozygous 554G-T transversion in the SAR1B gene, resulting in a gly185-to-val (G185V) 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">
Aguglia, U., Annesi, G., Pasquinelli, G., Spadafora, P., Gambardella, A., Annesi, F., Pasqua, A. A., Cavalcanti, F., Crescibene, L., Bagala, A., Bono, F., Oliveri, R. L., Valentino, P., Zappia, M., Quattrone, A.
<strong>Vitamin E deficiency due to chylomicron retention disease in Marinesco-Sjogren syndrome.</strong>
Ann. Neurol. 47: 260-264, 2000.
[PubMed: 10665502]
</p>
</li>
<li>
<p class="mim-text-font">
Annesi, G., Aguglia, U., Tarantino, P., Annesi, F., De Marco, E. V., Civitelli, D., Torroni, A., Quattrone, A.
<strong>SIL1 and SARA2 mutations in Marinesco-Sjogren and chylomicron retention disease. (Letter)</strong>
Clin. Genet. 71: 288-289, 2007.
[PubMed: 17309654]
[Full Text: https://doi.org/10.1111/j.1399-0004.2007.00759.x]
</p>
</li>
<li>
<p class="mim-text-font">
Charcosset, M., Sassolas, A., Peretti, N., Roy, C. C., Deslandres, C., Sinnett, D., Levy, E., Lachaux, A.
<strong>Anderson or chylomicron retention disease: molecular impact of five mutations in the SAR1B gene on the structure and the functionality of Sar1b protein.</strong>
Molec. Genet. Metab. 93: 74-84, 2008.
[PubMed: 17945526]
[Full Text: https://doi.org/10.1016/j.ymgme.2007.08.120]
</p>
</li>
<li>
<p class="mim-text-font">
He, H., Dai, F., Yu, L., She, X., Zhao, Y., Jiang, J., Chen, X., Zhao, S.
<strong>Identification and characterization of nine novel human small GTPases showing variable expressions in liver cancer tissues.</strong>
Gene Expr. 10: 231-242, 2002.
[PubMed: 12450215]
[Full Text: https://doi.org/10.3727/000000002783992406]
</p>
</li>
<li>
<p class="mim-text-font">
Jones, B., Jones, E. L., Bonney, S. A., Patel, H. N., Mensenkamp, A. R., Eichenbaum-Voline, S., Rudling, M., Myrdal, U., Annesi, G., Naik, S., Meadows, N., Quattrone, A., and 9 others.
<strong>Mutations in a Sar1 GTPase of COPII vesicles are associated with lipid absorption disorders.</strong>
Nature Genet. 34: 29-31, 2003.
[PubMed: 12692552]
[Full Text: https://doi.org/10.1038/ng1145]
</p>
</li>
<li>
<p class="mim-text-font">
Schekman, R., Orci, L.
<strong>Coat proteins and vesicle budding.</strong>
Science 271: 1526-1533, 1996.
[PubMed: 8599108]
[Full Text: https://doi.org/10.1126/science.271.5255.1526]
</p>
</li>
<li>
<p class="mim-text-font">
Takai, Y., Sasaki, T., Matozaki, T.
<strong>Small GTP-binding proteins.</strong>
Physiol. Rev. 81: 154-208, 2001.
[PubMed: 11152757]
[Full Text: https://doi.org/10.1152/physrev.2001.81.1.153]
</p>
</li>
</ol>
<div>
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Contributors:
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<span class="mim-text-font">
Patricia A. Hartz - updated : 7/23/2009<br>Cassandra L. Kniffin - updated : 2/23/2009<br>Cassandra L. Kniffin - updated : 8/29/2007
</span>
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Creation Date:
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<span class="mim-text-font">
Victor A. McKusick : 4/15/2003
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carol : 12/30/2019<br>carol : 06/11/2018<br>carol : 02/17/2014<br>mgross : 8/18/2009<br>terry : 7/23/2009<br>wwang : 4/2/2009<br>ckniffin : 2/23/2009<br>wwang : 9/11/2007<br>ckniffin : 8/29/2007<br>terry : 7/24/2003<br>alopez : 4/30/2003<br>alopez : 4/15/2003
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