nih-gov/www.ncbi.nlm.nih.gov/omim/613289

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Entry
- *613289 - ATAXIN 8; ATXN8
- OMIM
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<span class="h4">*613289</span>
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<strong>Table of Contents</strong>
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<a href="#geneMap"><strong>Gene-Phenotype Relationships</strong></a>
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<a href="#description">Description</a>
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<a href="#cloning">Cloning and Expression</a>
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<a href="#mapping">Mapping</a>
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<a href="#molecularGenetics">Molecular Genetics</a>
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<a href="#animalModel">Animal Model</a>
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<a href="#allelicVariants"><strong>Allelic Variants</strong></a>
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<div><a href="https://www.gwascentral.org/search?q=ATXN8" 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>
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<a id="title" class="mim-anchor"></a>
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<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> 715753001<br />
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<span class="h3">
<span class="mim-font mim-tip-hint" title="Gene description">
<span class="text-danger"><strong>*</strong></span>
613289
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<a id="preferredTitle" class="mim-anchor"></a>
<h3>
<span class="mim-font">
ATAXIN 8; ATXN8
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</h3>
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<br />
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<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=ATXN8" class="mim-tip-hint" title="HUGO Gene Nomenclature Committee." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'HGNC', 'domain': 'genenames.org'})">ATXN8</a></em></strong>
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<a id="cytogeneticLocation" class="mim-anchor"></a>
<p>
<span class="mim-text-font">
<strong>
<em>
Cytogenetic location: <a href="/geneMap/13/204?start=-3&limit=10&highlight=204">13q21</a>
&nbsp;
Genomic coordinates <span class="small">(GRCh38)</span> : <a href="https://genome.ucsc.edu/cgi-bin/hgTracks?db=hg38&position=chr13:54700001-72800000&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'})">13:54,700,001-72,800,000</a> </span>
</em>
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<br />
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<strong>Gene-Phenotype Relationships</strong>
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Phenotype <br /> MIM number
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Inheritance
</th>
<th>
Phenotype <br /> mapping key
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</tr>
</thead>
<tbody>
<tr>
<td rowspan="1">
<span class="mim-font">
<a href="/geneMap/13/204?start=-3&limit=10&highlight=204">
13q21
</a>
</span>
</td>
<td>
<span class="mim-font">
Spinocerebellar ataxia 8
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608768"> 608768 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</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>
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<p />
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<strong>TEXT</strong>
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<p>Spinocerebellar ataxia-8 (SCA8; <a href="/entry/608768">608768</a>) is a neurodegenerative disorder caused by a CTG/CAG trinucleotide repeat expansion on chromosome 13q21 (see <a href="/entry/603680#0001">603680.0001</a> and <a href="#0001">613289.0001</a>). Two genes span the CTG/CAG repeat and are expressed in opposite directions: ATXN8, which encodes a nearly pure polyglutamine expansion protein in the CAG direction, and ATXN8OS (<a href="/entry/603680">603680</a>), which, when transcribed, produces a noncoding CUG expansion RNA (<a href="#2" class="mim-tip-reference" title="Moseley, M. L., Zu, T., Ikeda, Y., Gao, W., Mosemiller, A. K., Daughters, R. S., Chen, G., Weatherspoon, M. R., Clark, H. B., Ebner, T. J., Day, J. W., Ranum. L. P. W. &lt;strong&gt;Bidirectional expression of CUG and CAG expansion transcripts and intranuclear polyglutamine inclusions in spinocerebellar ataxia type 8.&lt;/strong&gt; Nature Genet. 38: 758-769, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16804541/&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;16804541&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1827&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="16804541">Moseley et al., 2006</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16804541" 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>Cloning and Expression</strong>
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<p>Using transgenic mice expressing human BAC clones with and without the SCA8 CTG expansion, <a href="#2" class="mim-tip-reference" title="Moseley, M. L., Zu, T., Ikeda, Y., Gao, W., Mosemiller, A. K., Daughters, R. S., Chen, G., Weatherspoon, M. R., Clark, H. B., Ebner, T. J., Day, J. W., Ranum. L. P. W. &lt;strong&gt;Bidirectional expression of CUG and CAG expansion transcripts and intranuclear polyglutamine inclusions in spinocerebellar ataxia type 8.&lt;/strong&gt; Nature Genet. 38: 758-769, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16804541/&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;16804541&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1827&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="16804541">Moseley et al. (2006)</a> found that the BAC was transcribed in both directions, resulting in both CAG-containing ATXN8 transcripts and CUG-containing ATXN8OS transcripts. Only ATXN8 was translated into protein, which was predicted to contain an initiating methionine followed by a polyglutamine repeat broken only by 2 arg residues near its C terminus. Western blot analysis of transfected HEK293 cells detected ATXN8 at an apparent molecular mass of 40 kD, with variations in size dependent upon the length of the polyglutamine repeat. Immunohistochemical analysis showed that ATXN8 accumulated in nuclear inclusions in Purkinje, medullary, and dentate neurons from human SCA8 autopsy tissue, but not in normal control tissue. ATXN8 intranuclear inclusions were also detected in Purkinje cells and other neurons of SCA8 BAC expansion mice. <a href="#2" class="mim-tip-reference" title="Moseley, M. L., Zu, T., Ikeda, Y., Gao, W., Mosemiller, A. K., Daughters, R. S., Chen, G., Weatherspoon, M. R., Clark, H. B., Ebner, T. J., Day, J. W., Ranum. L. P. W. &lt;strong&gt;Bidirectional expression of CUG and CAG expansion transcripts and intranuclear polyglutamine inclusions in spinocerebellar ataxia type 8.&lt;/strong&gt; Nature Genet. 38: 758-769, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16804541/&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;16804541&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1827&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="16804541">Moseley et al. (2006)</a> noted that the SCA8 repeat region is not conserved in mice. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16804541" 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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<br />
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<strong>Mapping</strong>
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<span class="mim-text-font">
<p>By genomic sequence analysis, <a href="#2" class="mim-tip-reference" title="Moseley, M. L., Zu, T., Ikeda, Y., Gao, W., Mosemiller, A. K., Daughters, R. S., Chen, G., Weatherspoon, M. R., Clark, H. B., Ebner, T. J., Day, J. W., Ranum. L. P. W. &lt;strong&gt;Bidirectional expression of CUG and CAG expansion transcripts and intranuclear polyglutamine inclusions in spinocerebellar ataxia type 8.&lt;/strong&gt; Nature Genet. 38: 758-769, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16804541/&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;16804541&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1827&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="16804541">Moseley et al. (2006)</a> mapped the ATXN8 gene to chromosome 13q21, where it overlaps the ATXN8OS gene in the opposite orientation. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16804541" 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>Molecular Genetics</strong>
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<p><a href="#2" class="mim-tip-reference" title="Moseley, M. L., Zu, T., Ikeda, Y., Gao, W., Mosemiller, A. K., Daughters, R. S., Chen, G., Weatherspoon, M. R., Clark, H. B., Ebner, T. J., Day, J. W., Ranum. L. P. W. &lt;strong&gt;Bidirectional expression of CUG and CAG expansion transcripts and intranuclear polyglutamine inclusions in spinocerebellar ataxia type 8.&lt;/strong&gt; Nature Genet. 38: 758-769, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16804541/&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;16804541&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1827&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="16804541">Moseley et al. (2006)</a> identified IC2-immunoreactive intranuclear inclusions, detecting polyglutamine expansions, in brain tissue from patients with SCA8, but not in normal controls. The polyglutamine protein was determined to be ATXN8 resulting from an expanded CAG repeat (<a href="#0001">613289.0001</a>). A complementary expanded CTG repeat in the opposite strand, encoded by the ATXN8OS gene (<a href="/entry/603680#0001">603680.0001</a>), was identified in patients with SCA8 and shown to result in transcription of a toxic mRNA with an expanded CUG repeat (<a href="#1" class="mim-tip-reference" title="Koob, M. D., Moseley, M. L., Schut, L. J., Benzow, K. A., Bird, T. D., Day, J. W., Ranum, L. P. W. &lt;strong&gt;An untranslated CTG expansion causes a novel form of spinocerebellar ataxia (SCA8).&lt;/strong&gt; Nature Genet. 21: 379-384, 1999.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/10192387/&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;10192387&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/7710&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="10192387">Koob et al., 1999</a>). Thus, the findings of <a href="#2" class="mim-tip-reference" title="Moseley, M. L., Zu, T., Ikeda, Y., Gao, W., Mosemiller, A. K., Daughters, R. S., Chen, G., Weatherspoon, M. R., Clark, H. B., Ebner, T. J., Day, J. W., Ranum. L. P. W. &lt;strong&gt;Bidirectional expression of CUG and CAG expansion transcripts and intranuclear polyglutamine inclusions in spinocerebellar ataxia type 8.&lt;/strong&gt; Nature Genet. 38: 758-769, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16804541/&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;16804541&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1827&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="16804541">Moseley et al. (2006)</a> indicated that bidirectional transcription at the SCA8 locus results in expression of both a polyglutamine protein and a CUG expansion transcript, which may represent a toxic gain of function at both the protein and RNA levels. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=16804541+10192387" 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>Animal Model</strong>
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<p>For further information on the SCA8 transgenic mouse model reported by <a href="#2" class="mim-tip-reference" title="Moseley, M. L., Zu, T., Ikeda, Y., Gao, W., Mosemiller, A. K., Daughters, R. S., Chen, G., Weatherspoon, M. R., Clark, H. B., Ebner, T. J., Day, J. W., Ranum. L. P. W. &lt;strong&gt;Bidirectional expression of CUG and CAG expansion transcripts and intranuclear polyglutamine inclusions in spinocerebellar ataxia type 8.&lt;/strong&gt; Nature Genet. 38: 758-769, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16804541/&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;16804541&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1827&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="16804541">Moseley et al. (2006)</a>, see <a href="/entry/603680">603680</a>. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16804541" 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>1 Selected Example</a>):</strong>
</span>
</h4>
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<p />
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<div>
<a href="/allelicVariants/613289" class="btn btn-default" role="button"> Table View </a>
&nbsp;&nbsp;<a href="https://www.ncbi.nlm.nih.gov/clinvar?term=613289[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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<p />
</div>
<div>
<div>
<a id="0001" class="mim-anchor"></a>
<h4>
<span class="mim-font">
<strong>.0001&nbsp;SPINOCEREBELLAR ATAXIA 8</strong>
</span>
</h4>
</div>
<div>
<span class="mim-text-font">
<div style="float: left;">
ATXN8, (CAG)n REPEAT EXPANSION
</div>
</span>
&nbsp;&nbsp;
<span class="mim-text-font">
<a href="https://www.ncbi.nlm.nih.gov/clinvar?term=RCV000000215 OR RCV000006519 OR RCV001260914" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000000215, RCV000006519, RCV001260914" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000000215...</a>
</span>
</div>
<div>
<span class="mim-text-font">
<p><a href="#2" class="mim-tip-reference" title="Moseley, M. L., Zu, T., Ikeda, Y., Gao, W., Mosemiller, A. K., Daughters, R. S., Chen, G., Weatherspoon, M. R., Clark, H. B., Ebner, T. J., Day, J. W., Ranum. L. P. W. &lt;strong&gt;Bidirectional expression of CUG and CAG expansion transcripts and intranuclear polyglutamine inclusions in spinocerebellar ataxia type 8.&lt;/strong&gt; Nature Genet. 38: 758-769, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16804541/&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;16804541&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1827&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="16804541">Moseley et al. (2006)</a> identified IC2-immunoreactive intranuclear inclusions, detecting polyglutamine expansions, in brain tissue from patients with spinocerebellar ataxia-8 (SCA8; <a href="/entry/608768">608768</a>), but not in normal controls. The polyglutamine protein was determined to be ATXN8 resulting from an expanded CAG repeat. A complementary expanded CTG repeat in the opposite strand, encoded by the ATXN8OS gene (<a href="/entry/603680#0001">603680.0001</a>), was identified in patients with SCA8 and shown to result in transcription of a toxic mRNA with an expanded CUG repeat (<a href="#1" class="mim-tip-reference" title="Koob, M. D., Moseley, M. L., Schut, L. J., Benzow, K. A., Bird, T. D., Day, J. W., Ranum, L. P. W. &lt;strong&gt;An untranslated CTG expansion causes a novel form of spinocerebellar ataxia (SCA8).&lt;/strong&gt; Nature Genet. 21: 379-384, 1999.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/10192387/&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;10192387&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/7710&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="10192387">Koob et al., 1999</a>). Thus, the findings of <a href="#2" class="mim-tip-reference" title="Moseley, M. L., Zu, T., Ikeda, Y., Gao, W., Mosemiller, A. K., Daughters, R. S., Chen, G., Weatherspoon, M. R., Clark, H. B., Ebner, T. J., Day, J. W., Ranum. L. P. W. &lt;strong&gt;Bidirectional expression of CUG and CAG expansion transcripts and intranuclear polyglutamine inclusions in spinocerebellar ataxia type 8.&lt;/strong&gt; Nature Genet. 38: 758-769, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16804541/&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;16804541&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1827&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="16804541">Moseley et al. (2006)</a> indicated that bidirectional transcription at the SCA8 locus results in expression of both a polyglutamine protein and a CUG expansion transcript, which may represent a toxic gain of function at both the protein and RNA levels. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=16804541+10192387" 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>
</span>
</h4>
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<p />
</div>
<div id="mimReferencesFold" class="collapse in mimTextToggleFold">
<ol>
<li>
<a id="1" class="mim-anchor"></a>
<a id="Koob1999" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Koob, M. D., Moseley, M. L., Schut, L. J., Benzow, K. A., Bird, T. D., Day, J. W., Ranum, L. P. W.
<strong>An untranslated CTG expansion causes a novel form of spinocerebellar ataxia (SCA8).</strong>
Nature Genet. 21: 379-384, 1999.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/10192387/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">10192387</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10192387" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1038/7710" target="_blank">Full Text</a>]
</p>
</div>
</li>
<li>
<a id="2" class="mim-anchor"></a>
<a id="Moseley2006" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Moseley, M. L., Zu, T., Ikeda, Y., Gao, W., Mosemiller, A. K., Daughters, R. S., Chen, G., Weatherspoon, M. R., Clark, H. B., Ebner, T. J., Day, J. W., Ranum. L. P. W.
<strong>Bidirectional expression of CUG and CAG expansion transcripts and intranuclear polyglutamine inclusions in spinocerebellar ataxia type 8.</strong>
Nature Genet. 38: 758-769, 2006.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/16804541/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">16804541</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16804541" 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/ng1827" target="_blank">Full Text</a>]
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<a id="contributors" class="mim-anchor"></a>
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<a href="#mimCollapseContributors" role="button" data-toggle="collapse"> Contributors: </a>
</span>
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<div class="col-lg-6 col-md-6 col-sm-6 col-xs-6">
<span class="mim-text-font">
Cassandra L. Kniffin - updated : 3/3/2010
</span>
</div>
</div>
<div class="row collapse" id="mimCollapseContributors">
<div class="col-lg-offset-2 col-md-offset-4 col-sm-offset-4 col-xs-offset-2 col-lg-6 col-md-6 col-sm-6 col-xs-6">
<span class="mim-text-font">
Matthew B. Gross - updated : 3/1/2010
</span>
</div>
</div>
</div>
<div>
<a id="creationDate" class="mim-anchor"></a>
<div class="row">
<div class="col-lg-2 col-md-2 col-sm-4 col-xs-4">
<span class="text-nowrap mim-text-font">
Creation Date:
</span>
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<div class="col-lg-6 col-md-6 col-sm-6 col-xs-6">
<span class="mim-text-font">
Patricia A. Hartz : 3/1/2010
</span>
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<a id="editHistory" class="mim-anchor"></a>
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<a href="#mimCollapseEditHistory" role="button" data-toggle="collapse"> Edit History: </a>
</span>
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<div class="col-lg-6 col-md-6 col-sm-6 col-xs-6">
<span class="mim-text-font">
carol : 11/01/2019
</span>
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<div class="row collapse" id="mimCollapseEditHistory">
<div class="col-lg-offset-2 col-md-offset-2 col-sm-offset-4 col-xs-offset-4 col-lg-6 col-md-6 col-sm-6 col-xs-6">
<span class="mim-text-font">
mgross : 03/03/2010<br>mgross : 3/3/2010<br>ckniffin : 3/3/2010<br>mgross : 3/1/2010
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<h3>
<span class="mim-font">
<strong>*</strong> 613289
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<h3>
<span class="mim-font">
ATAXIN 8; ATXN8
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<p>
<span class="mim-text-font">
<strong><em>HGNC Approved Gene Symbol: ATXN8</em></strong>
</span>
</p>
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<p>
<span class="mim-text-font">
<strong>SNOMEDCT:</strong> 715753001; &nbsp;
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</p>
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<p>
<span class="mim-text-font">
<strong>
<em>
Cytogenetic location: 13q21
&nbsp;
Genomic coordinates <span class="small">(GRCh38)</span> : 13:54,700,001-72,800,000 </span>
</em>
</strong>
</span>
</p>
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<h4>
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<strong>Gene-Phenotype Relationships</strong>
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<table class="table table-bordered table-condensed small mim-table-padding">
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<th>
Location
</th>
<th>
Phenotype
</th>
<th>
Phenotype <br /> MIM number
</th>
<th>
Inheritance
</th>
<th>
Phenotype <br /> mapping key
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</tr>
</thead>
<tbody>
<tr>
<td rowspan="1">
<span class="mim-font">
13q21
</span>
</td>
<td>
<span class="mim-font">
Spinocerebellar ataxia 8
</span>
</td>
<td>
<span class="mim-font">
608768
</span>
</td>
<td>
<span class="mim-font">
Autosomal dominant
</span>
</td>
<td>
<span class="mim-font">
3
</span>
</td>
</tr>
</tbody>
</table>
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</div>
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<h4>
<span class="mim-font">
<strong>TEXT</strong>
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<h4>
<span class="mim-font">
<strong>Description</strong>
</span>
</h4>
</div>
<span class="mim-text-font">
<p>Spinocerebellar ataxia-8 (SCA8; 608768) is a neurodegenerative disorder caused by a CTG/CAG trinucleotide repeat expansion on chromosome 13q21 (see 603680.0001 and 613289.0001). Two genes span the CTG/CAG repeat and are expressed in opposite directions: ATXN8, which encodes a nearly pure polyglutamine expansion protein in the CAG direction, and ATXN8OS (603680), which, when transcribed, produces a noncoding CUG expansion RNA (Moseley et al., 2006). </p>
</span>
<div>
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</div>
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<h4>
<span class="mim-font">
<strong>Cloning and Expression</strong>
</span>
</h4>
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<span class="mim-text-font">
<p>Using transgenic mice expressing human BAC clones with and without the SCA8 CTG expansion, Moseley et al. (2006) found that the BAC was transcribed in both directions, resulting in both CAG-containing ATXN8 transcripts and CUG-containing ATXN8OS transcripts. Only ATXN8 was translated into protein, which was predicted to contain an initiating methionine followed by a polyglutamine repeat broken only by 2 arg residues near its C terminus. Western blot analysis of transfected HEK293 cells detected ATXN8 at an apparent molecular mass of 40 kD, with variations in size dependent upon the length of the polyglutamine repeat. Immunohistochemical analysis showed that ATXN8 accumulated in nuclear inclusions in Purkinje, medullary, and dentate neurons from human SCA8 autopsy tissue, but not in normal control tissue. ATXN8 intranuclear inclusions were also detected in Purkinje cells and other neurons of SCA8 BAC expansion mice. Moseley et al. (2006) noted that the SCA8 repeat region is not conserved in mice. </p>
</span>
<div>
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<h4>
<span class="mim-font">
<strong>Mapping</strong>
</span>
</h4>
</div>
<span class="mim-text-font">
<p>By genomic sequence analysis, Moseley et al. (2006) mapped the ATXN8 gene to chromosome 13q21, where it overlaps the ATXN8OS gene in the opposite orientation. </p>
</span>
<div>
<br />
</div>
<div>
<h4>
<span class="mim-font">
<strong>Molecular Genetics</strong>
</span>
</h4>
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<span class="mim-text-font">
<p>Moseley et al. (2006) identified IC2-immunoreactive intranuclear inclusions, detecting polyglutamine expansions, in brain tissue from patients with SCA8, but not in normal controls. The polyglutamine protein was determined to be ATXN8 resulting from an expanded CAG repeat (613289.0001). A complementary expanded CTG repeat in the opposite strand, encoded by the ATXN8OS gene (603680.0001), was identified in patients with SCA8 and shown to result in transcription of a toxic mRNA with an expanded CUG repeat (Koob et al., 1999). Thus, the findings of Moseley et al. (2006) indicated that bidirectional transcription at the SCA8 locus results in expression of both a polyglutamine protein and a CUG expansion transcript, which may represent a toxic gain of function at both the protein and RNA levels. </p>
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<strong>Animal Model</strong>
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<p>For further information on the SCA8 transgenic mouse model reported by Moseley et al. (2006), see 603680. </p>
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<strong>ALLELIC VARIANTS</strong>
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<strong>1 Selected Example):</strong>
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<strong>.0001 &nbsp; SPINOCEREBELLAR ATAXIA 8</strong>
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<span class="mim-text-font">
ATXN8, (CAG)n REPEAT EXPANSION
<br />
ClinVar: RCV000000215, RCV000006519, RCV001260914
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<span class="mim-text-font">
<p>Moseley et al. (2006) identified IC2-immunoreactive intranuclear inclusions, detecting polyglutamine expansions, in brain tissue from patients with spinocerebellar ataxia-8 (SCA8; 608768), but not in normal controls. The polyglutamine protein was determined to be ATXN8 resulting from an expanded CAG repeat. A complementary expanded CTG repeat in the opposite strand, encoded by the ATXN8OS gene (603680.0001), was identified in patients with SCA8 and shown to result in transcription of a toxic mRNA with an expanded CUG repeat (Koob et al., 1999). Thus, the findings of Moseley et al. (2006) indicated that bidirectional transcription at the SCA8 locus results in expression of both a polyglutamine protein and a CUG expansion transcript, which may represent a toxic gain of function at both the protein and RNA levels. </p>
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<h4>
<span class="mim-font">
<strong>REFERENCES</strong>
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<p />
</div>
<div>
<ol>
<li>
<p class="mim-text-font">
Koob, M. D., Moseley, M. L., Schut, L. J., Benzow, K. A., Bird, T. D., Day, J. W., Ranum, L. P. W.
<strong>An untranslated CTG expansion causes a novel form of spinocerebellar ataxia (SCA8).</strong>
Nature Genet. 21: 379-384, 1999.
[PubMed: 10192387]
[Full Text: https://doi.org/10.1038/7710]
</p>
</li>
<li>
<p class="mim-text-font">
Moseley, M. L., Zu, T., Ikeda, Y., Gao, W., Mosemiller, A. K., Daughters, R. S., Chen, G., Weatherspoon, M. R., Clark, H. B., Ebner, T. J., Day, J. W., Ranum. L. P. W.
<strong>Bidirectional expression of CUG and CAG expansion transcripts and intranuclear polyglutamine inclusions in spinocerebellar ataxia type 8.</strong>
Nature Genet. 38: 758-769, 2006.
[PubMed: 16804541]
[Full Text: https://doi.org/10.1038/ng1827]
</p>
</li>
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Cassandra L. Kniffin - updated : 3/3/2010<br>Matthew B. Gross - updated : 3/1/2010
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carol : 11/01/2019<br>mgross : 03/03/2010<br>mgross : 3/3/2010<br>ckniffin : 3/3/2010<br>mgross : 3/1/2010
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