nih-gov/www.ncbi.nlm.nih.gov/omim/590070

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Entry
- *590070 - TRANSFER RNA, MITOCHONDRIAL, PHENYLALANINE; MTTF
- OMIM
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<span class="h4">*590070</span>
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<a href="#geneFunction">Gene Function</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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<div><a href="http://biogps.org/#goto=genereport&id=4558" 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=ENSG00000210049;t=-" 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=MT-TF" 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>
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<a href="#" class="mim-tip-icd" qtip_title="<strong>ICD+</strong>" qtip_text="
<strong>SNOMEDCT:</strong> 230426003, 39925003, 428255004<br />
<strong>ICD10CM:</strong> E88.41, E88.42, N10-N16, N15.9, N16<br />
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<span class="mim-font mim-tip-hint" title="Gene description">
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590070
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<a id="preferredTitle" class="mim-anchor"></a>
<h3>
<span class="mim-font">
TRANSFER RNA, MITOCHONDRIAL, PHENYLALANINE; MTTF
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tRNA-PHE, MITOCHONDRIAL
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<strong><em>HGNC Approved Gene Symbol: <a href="https://www.genenames.org/tools/search/#!/genes?query=MT-TF" class="mim-tip-hint" title="HUGO Gene Nomenclature Committee." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'HGNC', 'domain': 'genenames.org'})">MT-TF</a></em></strong>
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<p>The mitochondrial tRNA for phenylalanine is encoded by nucleotides 577-647.</p>
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<p><a href="#10" class="mim-tip-reference" title="Zaganelli, S., Rebelo-Guiomar, P., Maundrell, K., Rozanska, A., Pierredon, S., Powell, C. A., Jourdain, A. A., Hulo, N., Lightowlers, R. N., Chrzanowska-Lightowlers, Z. M., Minczuk, M., Martinou, J.-C. &lt;strong&gt;The pseudouridine synthase RPUSD4 is an essential component of mitochondrial RNA granules.&lt;/strong&gt; J. Biol. Chem. 292: 4519-4532, 2017.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/28082677/&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;28082677&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=28082677[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1074/jbc.M116.771105&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="28082677">Zaganelli et al. (2017)</a> found that RPUSD4 (<a href="/entry/617488">617488</a>) coprecipitated with mitochondrial tRNA(phe) and mitochondrial tRNA(met) (MTTM; <a href="/entry/590065">590065</a>) and bound specifically to the pseudouridine at universal tRNA sites 39 and 50. Depletion of RPUSD4 significantly reduced pseudouridine-39 in mitochondrial tRNA(phe), but not in mitochondrial tRNA(gly) (MTTG; <a href="/entry/590035">590035</a>). The pseudouridines in mitochondrial tRNA(met) were unaffected by RPUSD4 depletion. RPUSD4 depletion had no effect on mitochondrial tRNA(phe) steady-state levels or aminoacylation. <a href="#10" class="mim-tip-reference" title="Zaganelli, S., Rebelo-Guiomar, P., Maundrell, K., Rozanska, A., Pierredon, S., Powell, C. A., Jourdain, A. A., Hulo, N., Lightowlers, R. N., Chrzanowska-Lightowlers, Z. M., Minczuk, M., Martinou, J.-C. &lt;strong&gt;The pseudouridine synthase RPUSD4 is an essential component of mitochondrial RNA granules.&lt;/strong&gt; J. Biol. Chem. 292: 4519-4532, 2017.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/28082677/&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;28082677&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=28082677[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1074/jbc.M116.771105&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="28082677">Zaganelli et al. (2017)</a> concluded that RPUSD4 is responsible for formation of pseudouridine-39 in mitochondrial tRNA(phe). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=28082677" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p>In patients with MELAS syndrome (mitochondrial encephalomyopathy with lactic acidosis and stroke-like episodes) (<a href="/entry/540000">540000</a>), <a href="#3" class="mim-tip-reference" title="Hanna, M. G., Nelson, I. P., Morgan-Hughes, J. A., Wood, N. W. &lt;strong&gt;MELAS: a new disease associated mitochondrial DNA mutation and evidence for further genetic heterogeneity.&lt;/strong&gt; J. Neurol. Neurosurg. Psychiat. 65: 512-517, 1998.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/9771776/&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;9771776&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1136/jnnp.65.4.512&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="9771776">Hanna et al. (1998)</a> and <a href="#5" class="mim-tip-reference" title="Mancuso, M., Filosto, M., Mootha, V. K., Rocchi, A., Pistolesi, S., Murri, L., DiMauro, S., Siciliano, G. &lt;strong&gt;A novel mitochondrial tRNA-phe mutation causes MERRF syndrome.&lt;/strong&gt; Neurology 62: 2119-2121, 2004.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/15184630/&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;15184630&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1212/01.wnl.0000127608.48406.f1&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="15184630">Mancuso et al. (2004)</a> identified mutations in the MTTF gene (<a href="#0001">590070.0001</a> and <a href="#0002">590070.0002</a>, respectively). <a href="https://pubmed.ncbi.nlm.nih.gov/?term=9771776+15184630" 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 in vitro studies, <a href="#4" class="mim-tip-reference" title="Ling, J., Roy, H., Qin, D., Rubio, M. A. T., Alfonzo, J. D., Fredrick, K., Ibba, M. &lt;strong&gt;Pathogenic mechanism of a human mitochondrial tRNA-Phe mutation associated with myoclonic epilepsy with ragged red fibers syndrome.&lt;/strong&gt; Proc. Nat. Acad. Sci. 104: 15299-15304, 2007.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17878308/&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;17878308&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=17878308[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1073/pnas.0704441104&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="17878308">Ling et al. (2007)</a> found that different pathogenic mutations in the MTTF gene resulted in aminoacylation defects, primarily by affecting the secondary or tertiary structure of the protein. The exception was the G34A mutation (<a href="#0002">590070.0002</a>), which was not involved in global structure but resulted in decreased aminoacylation because it affected the tRNA anticodon. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17878308" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<a id="allelicVariants" class="mim-anchor"></a>
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<span id="mimAllelicVariantsToggleTriangle" class="small mimTextToggleTriangle">&#9660;</span>
<strong>ALLELIC VARIANTS (<a href="/help/faq#1_4"></strong>
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<strong>7 Selected Examples</a>):</strong>
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<a href="/allelicVariants/590070" class="btn btn-default" role="button"> Table View </a>
&nbsp;&nbsp;<a href="https://www.ncbi.nlm.nih.gov/clinvar?term=590070[MIM]" class="btn btn-default mim-tip-hint" role="button" title="ClinVar aggregates information about sequence variation and its relationship to human health." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">ClinVar</a>
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<a id="0001" class="mim-anchor"></a>
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<strong>.0001&nbsp;MELAS SYNDROME</strong>
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MTTF, 583G-A
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<div class="btn-group"> <button type="button" class="btn btn-default btn-xs dropdown-toggle mim-font" data-toggle="dropdown">rs118203885 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs118203885;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=rs118203885" 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=rs118203885" 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=RCV000010186 OR RCV003153296" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000010186, RCV003153296" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000010186...</a>
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<p><a href="#7" class="mim-tip-reference" title="Shapira, Y., Cederbaum, S. D., Cancilla, P. A., Nielsen, D., Lippe, B. M. &lt;strong&gt;Familial poliodystrophy, mitochondrial myopathy, and lactic acidemia.&lt;/strong&gt; Neurology 25: 614-621, 1975.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/1171391/&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;1171391&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1212/wnl.25.7.614&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="1171391">Shapira et al. (1975)</a> provided the first description of a disorder that includes stroke-like episodes, lactic acidemia, and ragged-red fibers. <a href="#6" class="mim-tip-reference" title="Pavlakis, S. G., Phillips, P. C., DiMauro, S., De Vivo, D. C., Rowland, L. P. &lt;strong&gt;Mitochondrial myopathy, encephalopathy, lactic acidosis, and strokelike episodes: a distinctive clinical syndrome.&lt;/strong&gt; Ann. Neurol. 16: 481-488, 1984.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/6093682/&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;6093682&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1002/ana.410160409&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="6093682">Pavlakis et al. (1984)</a> described further cases, introduced the acronym MELAS (mitochondrial encephalomyopathy with lactic acidosis and stroke-like episodes) (<a href="/entry/540000">540000</a>), and suggested that this represents a distinct mitochondrial disorder. <a href="#2" class="mim-tip-reference" title="Goto, Y., Nonaka, I., Horai, S. &lt;strong&gt;A mutation in the tRNA-leu (UUR) gene associated with the MELAS subgroup of mitochondrial encephalomyopathies.&lt;/strong&gt; Nature 348: 651-653, 1990.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/2102678/&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;2102678&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/348651a0&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="2102678">Goto et al. (1990)</a> identified a point mutation in the gene encoding mtRNA leucine (UUR) (MTTL1; <a href="/entry/590050#0001">590050.0001</a>) in some patients with MELAS. <a href="#3" class="mim-tip-reference" title="Hanna, M. G., Nelson, I. P., Morgan-Hughes, J. A., Wood, N. W. &lt;strong&gt;MELAS: a new disease associated mitochondrial DNA mutation and evidence for further genetic heterogeneity.&lt;/strong&gt; J. Neurol. Neurosurg. Psychiat. 65: 512-517, 1998.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/9771776/&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;9771776&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1136/jnnp.65.4.512&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="9771776">Hanna et al. (1998)</a> analyzed the sequence of mitochondrial DNA in 5 patients with the MELAS phenotype. In one of the patients, a novel heteroplasmic mitochondrial DNA mutation was identified in the tRNA gene for phenylalanine in skeletal muscle. This mutation was not detected in the patient's blood or in her mother's blood. No pathogenic mutations were identified in the other patients. The mutation was a G-to-A transition at position 583 in the aminoacyl acceptor stem region of the MTTF gene. The proportion of the 583G-A mutation in the patient's muscle was 58%. Evolutionary comparisons showed that the 583G-A nucleotide is highly conserved. The patient was a 32-year-old woman who developed normally until the age of 12 years when she had an acute episode of headache, photophobia, vomiting, and left arm focal motor fitting from which she fully recovered. She experienced 2 further similar episodes and after the second developed a dense left hemiplegia which subsequently resolved. There followed progressive cognitive decline, cerebellar ataxia, and complex partial seizures. At the age of 29 years, a salt and pepper type retinopathy, cerebellar ataxia, mild spasticity in all 4 limbs, and intermittent dystonic posturing of her upper limbs as she walked were found. There was no limb weakness. Brain CT showed extensive low density areas involving both gray and white matter, most marked posteriorly. These were consistent with areas of infarction. Plasma lactate was raised. Muscle biopsy at age 12 years showed 3% ragged-red fibers. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=6093682+2102678+1171391+9771776" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<a id="0002" class="mim-anchor"></a>
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<strong>.0002&nbsp;MERRF SYNDROME</strong>
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MTTF, 611G-A
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<div class="btn-group"> <button type="button" class="btn btn-default btn-xs dropdown-toggle mim-font" data-toggle="dropdown">rs118203886 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs118203886;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=rs118203886" 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=rs118203886" 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=RCV000010187" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000010187" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000010187</a>
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<p>In a patient with MERRF syndrome (<a href="/entry/545000">545000</a>), <a href="#5" class="mim-tip-reference" title="Mancuso, M., Filosto, M., Mootha, V. K., Rocchi, A., Pistolesi, S., Murri, L., DiMauro, S., Siciliano, G. &lt;strong&gt;A novel mitochondrial tRNA-phe mutation causes MERRF syndrome.&lt;/strong&gt; Neurology 62: 2119-2121, 2004.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/15184630/&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;15184630&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1212/01.wnl.0000127608.48406.f1&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="15184630">Mancuso et al. (2004)</a> identified a heteroplasmic 611G-A transition in the MTTF gene, resulting in a gly34-to-ala (G34A) substitution. The mutation was abundant in muscle (91%), particularly in COX-negative fibers, but undetectable in the patient's blood, urinary sediment, skin fibroblasts, and buccal smear. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=15184630" 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="#4" class="mim-tip-reference" title="Ling, J., Roy, H., Qin, D., Rubio, M. A. T., Alfonzo, J. D., Fredrick, K., Ibba, M. &lt;strong&gt;Pathogenic mechanism of a human mitochondrial tRNA-Phe mutation associated with myoclonic epilepsy with ragged red fibers syndrome.&lt;/strong&gt; Proc. Nat. Acad. Sci. 104: 15299-15304, 2007.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17878308/&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;17878308&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=17878308[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1073/pnas.0704441104&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="17878308">Ling et al. (2007)</a> demonstrated that the G34A mutation affects the anticodon of the protein and therefore results in decreased aminoacylation activity in vitro by 100-fold, but does not affect global folding or recognition by elongation factor. Modification of the tRNA binding region of nuclear-encoded human mitochondrial PheRS (<a href="/entry/611592">611592</a>) was able to partially restore aminoacylation efficiency for the G34A mutation in vitro. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17878308" 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;MYOPATHY, MITOCHONDRIAL, LATE-ONSET</strong>
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MTTF, 622G-A
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<div class="btn-group"> <button type="button" class="btn btn-default btn-xs dropdown-toggle mim-font" data-toggle="dropdown">rs118203887 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs118203887;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=rs118203887" 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=rs118203887" 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=RCV000010188 OR RCV002247289" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000010188, RCV002247289" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000010188...</a>
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<p>In a 66-year-old woman with a 4-year history of walking difficulties due to exercise intolerance and paresthesias in the feet, <a href="#1" class="mim-tip-reference" title="Deschauer, M., Swalwell, H., Strauss, M., Zierz, S., Taylor, R. W. &lt;strong&gt;Novel mitochondrial transfer RNA-phe gene mutation associated with late-onset neuromuscular disease.&lt;/strong&gt; Arch. Neurol. 63: 902-905, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16769874/&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;16769874&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1001/archneur.63.6.902&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="16769874">Deschauer et al. (2006)</a> identified a heteroplasmic 622G-A transition in the MTTF gene. The mutation occurs in a highly conserved nucleotide within the variable loop of the protein. The patient also had mild sensorineural hearing impairment with a loss of up to 60 dB at higher frequencies. Resting serum lactate levels were normal but increased significantly after gentle exercise. Skeletal muscle biopsy detected atrophic muscle fibers, and histochemical analysis showed over 35% COX-negative fibers. Enzyme assay showed decreased activity of several respiratory chain complexes. The 622G-A transition was detected in skeletal muscle (88%), hair (70%), urinary epithelia (66%), buccal epithelia (63%), and blood (36%). The patient's mother reportedly had walking difficulties later in life, and tissues from the patient's asymptomatic daughter showed low levels of the mutation (10 to 20%). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16769874" 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;EPILEPSY, MITOCHONDRIAL</strong>
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MTTF, 616T-C
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<div class="btn-group"> <button type="button" class="btn btn-default btn-xs dropdown-toggle mim-font" data-toggle="dropdown">rs387906420 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs387906420;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=rs387906420" 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=rs387906420" 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=RCV000010189 OR RCV000850644 OR RCV001804724 OR RCV002247290" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000010189, RCV000850644, RCV001804724, RCV002247290" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000010189...</a>
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<p>In a patient with severe epilepsy, <a href="#11" class="mim-tip-reference" title="Zsurka, G., Hampel, K. G., Nelson, I., Jardel, C., Mirandola, S. R., Sassen, R., Kornblum, C., Marcorelles, P., Lavoue, S., Lombes, A., Kunz, W. S. &lt;strong&gt;Severe epilepsy as the major symptom of new mutations in the mitochondrial tRNA(Phe) gene.&lt;/strong&gt; Neurology 74: 507-512, 2010.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/20142618/&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;20142618&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1212/WNL.0b013e3181cef7ab&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="20142618">Zsurka et al. (2010)</a> identified a homoplasmic 616T-C transition in the MTTF gene in a highly conserved position in the anticodon stem. She had her first epileptic seizure at age 10 months, with a left-sided complex partial seizure followed by a transient paresis of the left arm. At age 2 years she had status epilepticus with bilateral myoclonus. She continued to have drug-resistant seizures, with myoclonus, complex partial seizures, and episodes of status epilepticus and epilepsia partialis continua. She also had chronic renal insufficiency and delayed psychomotor development. She died of heart failure after status epilepticus at the age of 17 years. There was no evidence of cerebellar ataxia, polyneuropathy, myopathy, or visual or hearing loss. A maternal cousin also had epileptic seizures starting in early childhood and died of kidney failure. Skeletal muscle biopsy of the proband did not show ragged red fibers, but did show a combined respiratory chain defect with reduced complex IV activity. Family members who were heteroplasmic for the mutation had no clinical symptoms. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=20142618" 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;EPILEPSY, MITOCHONDRIAL</strong>
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MTTF, 616T-G
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<div class="btn-group"> <button type="button" class="btn btn-default btn-xs dropdown-toggle mim-font" data-toggle="dropdown">rs387906420 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs387906420;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=rs387906420" 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=rs387906420" 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=RCV000010190" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000010190" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000010190</a>
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<p>In a patient with severe epilepsy, <a href="#11" class="mim-tip-reference" title="Zsurka, G., Hampel, K. G., Nelson, I., Jardel, C., Mirandola, S. R., Sassen, R., Kornblum, C., Marcorelles, P., Lavoue, S., Lombes, A., Kunz, W. S. &lt;strong&gt;Severe epilepsy as the major symptom of new mutations in the mitochondrial tRNA(Phe) gene.&lt;/strong&gt; Neurology 74: 507-512, 2010.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/20142618/&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;20142618&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1212/WNL.0b013e3181cef7ab&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="20142618">Zsurka et al. (2010)</a> identified a homoplasmic 616T-G transversion in the MTTF gene in a highly conserved position in the anticodon stem. The male proband presented at age 15 years with generalized tonic-clonic seizures rapidly followed by continuous partial seizures affecting the left hemiface and myoclonus. He had status epilepticus at age 17 years and died of infection in intensive care unit after 4 months in status epilepticus. The patient's mother and maternal aunt both presented with status epilepticus at age 15 years. Skeletal muscle biopsy of the proband did not show ragged red fibers, but did show a combined respiratory chain defect with reduced complex IV activity. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=20142618" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<strong>.0006&nbsp;ENCEPHALOPATHY, MITOCHONDRIAL</strong>
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MTTF, 586G-A
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<div class="btn-group"> <button type="button" class="btn btn-default btn-xs dropdown-toggle mim-font" data-toggle="dropdown">rs387906734 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs387906734;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=rs387906734" 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=rs387906734" 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=RCV000022903 OR RCV000850632" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000022903, RCV000850632" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000022903...</a>
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<p>In a 57-year-old woman with a progressive neurodegenerative disorder, <a href="#9" class="mim-tip-reference" title="Young, T. M., Blakely, E. L., Swalwell, H., Carter, J. E., Kartsounis, L. D., O&#x27;Donovan, D. G., Turnbull, D. M., Taylor, R. W., de Silva, R. N. &lt;strong&gt;Mitochondrial transfer RNA(Phe) mutation associated with a progressive neurodegenerative disorder characterized by psychiatric disturbance, dementia, and akinesia-rigidity.&lt;/strong&gt; Arch. Neurol. 67: 1399-1402, 2010.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/21060018/&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;21060018&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1001/archneurol.2010.283&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="21060018">Young et al. (2010)</a> identified a heteroplasmic 586G-A transition in the MTTF gene. The phenotype was characterized by frontotemporal dementia, auditory hallucinations, sensorineural deafness, and akinesia-rigidity. The mutation level was highest in patient muscle (85%), with lower levels in urinary epithelia (29%) and blood (3%). Muscle biopsy showed ragged red fibers and decreased COX-positive fibers. Extraction of DNA from her deceased mother's paraffin-embedded tissue showed that the mother was heteroplasmic for the mutation (13% in breast tissue). <a href="#9" class="mim-tip-reference" title="Young, T. M., Blakely, E. L., Swalwell, H., Carter, J. E., Kartsounis, L. D., O&#x27;Donovan, D. G., Turnbull, D. M., Taylor, R. W., de Silva, R. N. &lt;strong&gt;Mitochondrial transfer RNA(Phe) mutation associated with a progressive neurodegenerative disorder characterized by psychiatric disturbance, dementia, and akinesia-rigidity.&lt;/strong&gt; Arch. Neurol. 67: 1399-1402, 2010.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/21060018/&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;21060018&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1001/archneurol.2010.283&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="21060018">Young et al. (2010)</a> emphasized that the mutation appeared to cause an extrapyramidal symptom in this patient. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=21060018" 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;NEPHROPATHY, TUBULOINTERSTITIAL</strong>
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MTTF, 608A-G
</div>
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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">rs387906735 <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs387906735;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=rs387906735" 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=rs387906735" 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=RCV000022904 OR RCV002247380" target="_blank" class="btn btn-default btn-xs mim-tip-hint" title="RCV000022904, RCV002247380" onclick="gtag('event', 'mim_outbound', {'name': 'ClinVar', 'domain': 'ncbi.nlm.nih.gov'})">RCV000022904...</a>
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<p>In 2 sibs with infantile onset of progressive renal failure due to tubulointerstitial nephropathy, <a href="#8" class="mim-tip-reference" title="Tzen, C.-Y., Tsai, J.-D., Wu, T.-Y., Chen, B.-F., Chen, M.-L., Lin, S.-P., Chen, S.-C. &lt;strong&gt;Tubulointerstitial nephritis associated with a novel mitochondrial point mutation.&lt;/strong&gt; Kidney Int. 59: 846-854, 2001.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/11231339/&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;11231339&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1046/j.1523-1755.2001.059003846.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="11231339">Tzen et al. (2001)</a> identified a homoplasmic 608A-G transition in a conserved nucleotide in the MTTF gene that affects the anticodon stem and loop of the tRNA, potentially altering the tertiary structure. The mutation was not found in 97 controls. Leukocyte mtDNA of the unaffected mother carried the same mutation. The disorder was multisystemic, but both patients were brought to medical attention for failure to thrive and chronic renal insufficiency. Additional features included delayed development, brain atrophy, ataxia, anemia, muscle weakness and atrophy, and lesions suggestive of stroke in deep brain regions. Renal ultrasound showed increased echogenicity, and biopsy showed tubulointerstitial nephropathy with sclerotic tufts and thickening of Bowman's capsule with evidence of fibrosis. Electron microscopy showed irregular mitochondria with crystalline inclusions and abnormal morphology, such as swollen intracristal spaces. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=11231339" 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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<div id="mimReferencesFold" class="collapse in mimTextToggleFold">
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<a id="1" class="mim-anchor"></a>
<a id="Deschauer2006" class="mim-anchor"></a>
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Deschauer, M., Swalwell, H., Strauss, M., Zierz, S., Taylor, R. W.
<strong>Novel mitochondrial transfer RNA-phe gene mutation associated with late-onset neuromuscular disease.</strong>
Arch. Neurol. 63: 902-905, 2006.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/16769874/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">16769874</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16769874" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1001/archneur.63.6.902" target="_blank">Full Text</a>]
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<a id="Goto1990" class="mim-anchor"></a>
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Goto, Y., Nonaka, I., Horai, S.
<strong>A mutation in the tRNA-leu (UUR) gene associated with the MELAS subgroup of mitochondrial encephalomyopathies.</strong>
Nature 348: 651-653, 1990.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/2102678/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">2102678</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=2102678" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1038/348651a0" target="_blank">Full Text</a>]
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<a id="Hanna1998" class="mim-anchor"></a>
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Hanna, M. G., Nelson, I. P., Morgan-Hughes, J. A., Wood, N. W.
<strong>MELAS: a new disease associated mitochondrial DNA mutation and evidence for further genetic heterogeneity.</strong>
J. Neurol. Neurosurg. Psychiat. 65: 512-517, 1998.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9771776/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9771776</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=9771776" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1136/jnnp.65.4.512" target="_blank">Full Text</a>]
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<a id="Ling2007" class="mim-anchor"></a>
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Ling, J., Roy, H., Qin, D., Rubio, M. A. T., Alfonzo, J. D., Fredrick, K., Ibba, M.
<strong>Pathogenic mechanism of a human mitochondrial tRNA-Phe mutation associated with myoclonic epilepsy with ragged red fibers syndrome.</strong>
Proc. Nat. Acad. Sci. 104: 15299-15304, 2007.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/17878308/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">17878308</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=17878308[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17878308" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1073/pnas.0704441104" target="_blank">Full Text</a>]
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<a id="Mancuso2004" class="mim-anchor"></a>
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Mancuso, M., Filosto, M., Mootha, V. K., Rocchi, A., Pistolesi, S., Murri, L., DiMauro, S., Siciliano, G.
<strong>A novel mitochondrial tRNA-phe mutation causes MERRF syndrome.</strong>
Neurology 62: 2119-2121, 2004.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/15184630/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">15184630</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=15184630" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1212/01.wnl.0000127608.48406.f1" target="_blank">Full Text</a>]
</p>
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<a id="Pavlakis1984" class="mim-anchor"></a>
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<p class="mim-text-font">
Pavlakis, S. G., Phillips, P. C., DiMauro, S., De Vivo, D. C., Rowland, L. P.
<strong>Mitochondrial myopathy, encephalopathy, lactic acidosis, and strokelike episodes: a distinctive clinical syndrome.</strong>
Ann. Neurol. 16: 481-488, 1984.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/6093682/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">6093682</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=6093682" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1002/ana.410160409" target="_blank">Full Text</a>]
</p>
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<a id="Shapira1975" class="mim-anchor"></a>
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Shapira, Y., Cederbaum, S. D., Cancilla, P. A., Nielsen, D., Lippe, B. M.
<strong>Familial poliodystrophy, mitochondrial myopathy, and lactic acidemia.</strong>
Neurology 25: 614-621, 1975.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/1171391/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">1171391</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=1171391" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1212/wnl.25.7.614" target="_blank">Full Text</a>]
</p>
</div>
</li>
<li>
<a id="8" class="mim-anchor"></a>
<a id="Tzen2001" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Tzen, C.-Y., Tsai, J.-D., Wu, T.-Y., Chen, B.-F., Chen, M.-L., Lin, S.-P., Chen, S.-C.
<strong>Tubulointerstitial nephritis associated with a novel mitochondrial point mutation.</strong>
Kidney Int. 59: 846-854, 2001.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/11231339/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">11231339</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=11231339" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1046/j.1523-1755.2001.059003846.x" target="_blank">Full Text</a>]
</p>
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<a id="9" class="mim-anchor"></a>
<a id="Young2010" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Young, T. M., Blakely, E. L., Swalwell, H., Carter, J. E., Kartsounis, L. D., O'Donovan, D. G., Turnbull, D. M., Taylor, R. W., de Silva, R. N.
<strong>Mitochondrial transfer RNA(Phe) mutation associated with a progressive neurodegenerative disorder characterized by psychiatric disturbance, dementia, and akinesia-rigidity.</strong>
Arch. Neurol. 67: 1399-1402, 2010.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/21060018/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">21060018</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=21060018" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1001/archneurol.2010.283" target="_blank">Full Text</a>]
</p>
</div>
</li>
<li>
<a id="10" class="mim-anchor"></a>
<a id="Zaganelli2017" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Zaganelli, S., Rebelo-Guiomar, P., Maundrell, K., Rozanska, A., Pierredon, S., Powell, C. A., Jourdain, A. A., Hulo, N., Lightowlers, R. N., Chrzanowska-Lightowlers, Z. M., Minczuk, M., Martinou, J.-C.
<strong>The pseudouridine synthase RPUSD4 is an essential component of mitochondrial RNA granules.</strong>
J. Biol. Chem. 292: 4519-4532, 2017.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/28082677/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">28082677</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=28082677[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=28082677" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1074/jbc.M116.771105" target="_blank">Full Text</a>]
</p>
</div>
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<a id="11" class="mim-anchor"></a>
<a id="Zsurka2010" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Zsurka, G., Hampel, K. G., Nelson, I., Jardel, C., Mirandola, S. R., Sassen, R., Kornblum, C., Marcorelles, P., Lavoue, S., Lombes, A., Kunz, W. S.
<strong>Severe epilepsy as the major symptom of new mutations in the mitochondrial tRNA(Phe) gene.</strong>
Neurology 74: 507-512, 2010.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/20142618/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">20142618</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=20142618" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1212/WNL.0b013e3181cef7ab" target="_blank">Full Text</a>]
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<a id="contributors" class="mim-anchor"></a>
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<div class="col-lg-6 col-md-6 col-sm-6 col-xs-6">
<span class="mim-text-font">
Elizabeth S. Partan - updated : 05/22/2017
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Cassandra L. Kniffin - updated : 3/30/2011<br>Cassandra L. Kniffin - updated : 1/21/2011<br>Cassandra L. Kniffin - updated : 5/5/2010<br>Cassandra L. Kniffin - updated : 10/16/2007<br>Cassandra L. Kniffin - updated : 2/13/2007<br>Cassandra L. Kniffin - updated : 1/31/2005<br>Victor A. McKusick - updated : 2/15/1999
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Creation Date:
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Victor A. McKusick : 3/2/1993
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mgross : 05/22/2017
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wwang : 04/12/2011<br>ckniffin : 3/30/2011<br>wwang : 2/16/2011<br>ckniffin : 1/21/2011<br>wwang : 5/10/2010<br>ckniffin : 5/5/2010<br>wwang : 11/19/2007<br>ckniffin : 10/16/2007<br>wwang : 2/19/2007<br>ckniffin : 2/13/2007<br>ckniffin : 1/31/2005<br>mgross : 3/10/1999<br>carol : 2/16/1999<br>terry : 2/15/1999<br>terry : 2/15/1999<br>carol : 5/26/1993<br>carol : 5/17/1993<br>carol : 3/2/1993
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<h3>
<span class="mim-font">
<strong>*</strong> 590070
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<h3>
<span class="mim-font">
TRANSFER RNA, MITOCHONDRIAL, PHENYLALANINE; MTTF
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<span class="mim-font">
<em>Alternative titles; symbols</em>
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<span class="mim-font">
tRNA-PHE, MITOCHONDRIAL
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<strong><em>HGNC Approved Gene Symbol: MT-TF</em></strong>
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<span class="mim-text-font">
<strong>SNOMEDCT:</strong> 230426003, 39925003, 428255004; &nbsp;
<strong>ICD10CM:</strong> E88.41, E88.42, N10-N16, N15.9, N16; &nbsp;
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<strong>TEXT</strong>
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<p>The mitochondrial tRNA for phenylalanine is encoded by nucleotides 577-647.</p>
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<span class="mim-font">
<strong>Gene Function</strong>
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<p>Zaganelli et al. (2017) found that RPUSD4 (617488) coprecipitated with mitochondrial tRNA(phe) and mitochondrial tRNA(met) (MTTM; 590065) and bound specifically to the pseudouridine at universal tRNA sites 39 and 50. Depletion of RPUSD4 significantly reduced pseudouridine-39 in mitochondrial tRNA(phe), but not in mitochondrial tRNA(gly) (MTTG; 590035). The pseudouridines in mitochondrial tRNA(met) were unaffected by RPUSD4 depletion. RPUSD4 depletion had no effect on mitochondrial tRNA(phe) steady-state levels or aminoacylation. Zaganelli et al. (2017) concluded that RPUSD4 is responsible for formation of pseudouridine-39 in mitochondrial tRNA(phe). </p>
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<strong>Molecular Genetics</strong>
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<p>In patients with MELAS syndrome (mitochondrial encephalomyopathy with lactic acidosis and stroke-like episodes) (540000), Hanna et al. (1998) and Mancuso et al. (2004) identified mutations in the MTTF gene (590070.0001 and 590070.0002, respectively). </p><p>By in vitro studies, Ling et al. (2007) found that different pathogenic mutations in the MTTF gene resulted in aminoacylation defects, primarily by affecting the secondary or tertiary structure of the protein. The exception was the G34A mutation (590070.0002), which was not involved in global structure but resulted in decreased aminoacylation because it affected the tRNA anticodon. </p>
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<h4>
<span class="mim-font">
<strong>ALLELIC VARIANTS</strong>
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<strong>7 Selected Examples):</strong>
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<strong>.0001 &nbsp; MELAS SYNDROME</strong>
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MTTF, 583G-A
<br />
SNP: rs118203885,
ClinVar: RCV000010186, RCV003153296
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<p>Shapira et al. (1975) provided the first description of a disorder that includes stroke-like episodes, lactic acidemia, and ragged-red fibers. Pavlakis et al. (1984) described further cases, introduced the acronym MELAS (mitochondrial encephalomyopathy with lactic acidosis and stroke-like episodes) (540000), and suggested that this represents a distinct mitochondrial disorder. Goto et al. (1990) identified a point mutation in the gene encoding mtRNA leucine (UUR) (MTTL1; 590050.0001) in some patients with MELAS. Hanna et al. (1998) analyzed the sequence of mitochondrial DNA in 5 patients with the MELAS phenotype. In one of the patients, a novel heteroplasmic mitochondrial DNA mutation was identified in the tRNA gene for phenylalanine in skeletal muscle. This mutation was not detected in the patient's blood or in her mother's blood. No pathogenic mutations were identified in the other patients. The mutation was a G-to-A transition at position 583 in the aminoacyl acceptor stem region of the MTTF gene. The proportion of the 583G-A mutation in the patient's muscle was 58%. Evolutionary comparisons showed that the 583G-A nucleotide is highly conserved. The patient was a 32-year-old woman who developed normally until the age of 12 years when she had an acute episode of headache, photophobia, vomiting, and left arm focal motor fitting from which she fully recovered. She experienced 2 further similar episodes and after the second developed a dense left hemiplegia which subsequently resolved. There followed progressive cognitive decline, cerebellar ataxia, and complex partial seizures. At the age of 29 years, a salt and pepper type retinopathy, cerebellar ataxia, mild spasticity in all 4 limbs, and intermittent dystonic posturing of her upper limbs as she walked were found. There was no limb weakness. Brain CT showed extensive low density areas involving both gray and white matter, most marked posteriorly. These were consistent with areas of infarction. Plasma lactate was raised. Muscle biopsy at age 12 years showed 3% ragged-red fibers. </p>
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<strong>.0002 &nbsp; MERRF SYNDROME</strong>
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<div>
<span class="mim-text-font">
MTTF, 611G-A
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SNP: rs118203886,
ClinVar: RCV000010187
</span>
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<div>
<span class="mim-text-font">
<p>In a patient with MERRF syndrome (545000), Mancuso et al. (2004) identified a heteroplasmic 611G-A transition in the MTTF gene, resulting in a gly34-to-ala (G34A) substitution. The mutation was abundant in muscle (91%), particularly in COX-negative fibers, but undetectable in the patient's blood, urinary sediment, skin fibroblasts, and buccal smear. </p><p>Ling et al. (2007) demonstrated that the G34A mutation affects the anticodon of the protein and therefore results in decreased aminoacylation activity in vitro by 100-fold, but does not affect global folding or recognition by elongation factor. Modification of the tRNA binding region of nuclear-encoded human mitochondrial PheRS (611592) was able to partially restore aminoacylation efficiency for the G34A mutation in vitro. </p>
</span>
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<div>
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<h4>
<span class="mim-font">
<strong>.0003 &nbsp; MYOPATHY, MITOCHONDRIAL, LATE-ONSET</strong>
</span>
</h4>
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<div>
<span class="mim-text-font">
MTTF, 622G-A
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SNP: rs118203887,
ClinVar: RCV000010188, RCV002247289
</span>
</div>
<div>
<span class="mim-text-font">
<p>In a 66-year-old woman with a 4-year history of walking difficulties due to exercise intolerance and paresthesias in the feet, Deschauer et al. (2006) identified a heteroplasmic 622G-A transition in the MTTF gene. The mutation occurs in a highly conserved nucleotide within the variable loop of the protein. The patient also had mild sensorineural hearing impairment with a loss of up to 60 dB at higher frequencies. Resting serum lactate levels were normal but increased significantly after gentle exercise. Skeletal muscle biopsy detected atrophic muscle fibers, and histochemical analysis showed over 35% COX-negative fibers. Enzyme assay showed decreased activity of several respiratory chain complexes. The 622G-A transition was detected in skeletal muscle (88%), hair (70%), urinary epithelia (66%), buccal epithelia (63%), and blood (36%). The patient's mother reportedly had walking difficulties later in life, and tissues from the patient's asymptomatic daughter showed low levels of the mutation (10 to 20%). </p>
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<div>
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<span class="mim-font">
<strong>.0004 &nbsp; EPILEPSY, MITOCHONDRIAL</strong>
</span>
</h4>
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<div>
<span class="mim-text-font">
MTTF, 616T-C
<br />
SNP: rs387906420,
ClinVar: RCV000010189, RCV000850644, RCV001804724, RCV002247290
</span>
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<div>
<span class="mim-text-font">
<p>In a patient with severe epilepsy, Zsurka et al. (2010) identified a homoplasmic 616T-C transition in the MTTF gene in a highly conserved position in the anticodon stem. She had her first epileptic seizure at age 10 months, with a left-sided complex partial seizure followed by a transient paresis of the left arm. At age 2 years she had status epilepticus with bilateral myoclonus. She continued to have drug-resistant seizures, with myoclonus, complex partial seizures, and episodes of status epilepticus and epilepsia partialis continua. She also had chronic renal insufficiency and delayed psychomotor development. She died of heart failure after status epilepticus at the age of 17 years. There was no evidence of cerebellar ataxia, polyneuropathy, myopathy, or visual or hearing loss. A maternal cousin also had epileptic seizures starting in early childhood and died of kidney failure. Skeletal muscle biopsy of the proband did not show ragged red fibers, but did show a combined respiratory chain defect with reduced complex IV activity. Family members who were heteroplasmic for the mutation had no clinical symptoms. </p>
</span>
</div>
<div>
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<h4>
<span class="mim-font">
<strong>.0005 &nbsp; EPILEPSY, MITOCHONDRIAL</strong>
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</h4>
</div>
<div>
<span class="mim-text-font">
MTTF, 616T-G
<br />
SNP: rs387906420,
ClinVar: RCV000010190
</span>
</div>
<div>
<span class="mim-text-font">
<p>In a patient with severe epilepsy, Zsurka et al. (2010) identified a homoplasmic 616T-G transversion in the MTTF gene in a highly conserved position in the anticodon stem. The male proband presented at age 15 years with generalized tonic-clonic seizures rapidly followed by continuous partial seizures affecting the left hemiface and myoclonus. He had status epilepticus at age 17 years and died of infection in intensive care unit after 4 months in status epilepticus. The patient's mother and maternal aunt both presented with status epilepticus at age 15 years. Skeletal muscle biopsy of the proband did not show ragged red fibers, but did show a combined respiratory chain defect with reduced complex IV activity. </p>
</span>
</div>
<div>
<br />
</div>
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<div>
<div>
<h4>
<span class="mim-font">
<strong>.0006 &nbsp; ENCEPHALOPATHY, MITOCHONDRIAL</strong>
</span>
</h4>
</div>
<div>
<span class="mim-text-font">
MTTF, 586G-A
<br />
SNP: rs387906734,
ClinVar: RCV000022903, RCV000850632
</span>
</div>
<div>
<span class="mim-text-font">
<p>In a 57-year-old woman with a progressive neurodegenerative disorder, Young et al. (2010) identified a heteroplasmic 586G-A transition in the MTTF gene. The phenotype was characterized by frontotemporal dementia, auditory hallucinations, sensorineural deafness, and akinesia-rigidity. The mutation level was highest in patient muscle (85%), with lower levels in urinary epithelia (29%) and blood (3%). Muscle biopsy showed ragged red fibers and decreased COX-positive fibers. Extraction of DNA from her deceased mother's paraffin-embedded tissue showed that the mother was heteroplasmic for the mutation (13% in breast tissue). Young et al. (2010) emphasized that the mutation appeared to cause an extrapyramidal symptom in this patient. </p>
</span>
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<div>
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<h4>
<span class="mim-font">
<strong>.0007 &nbsp; NEPHROPATHY, TUBULOINTERSTITIAL</strong>
</span>
</h4>
</div>
<div>
<span class="mim-text-font">
MTTF, 608A-G
<br />
SNP: rs387906735,
ClinVar: RCV000022904, RCV002247380
</span>
</div>
<div>
<span class="mim-text-font">
<p>In 2 sibs with infantile onset of progressive renal failure due to tubulointerstitial nephropathy, Tzen et al. (2001) identified a homoplasmic 608A-G transition in a conserved nucleotide in the MTTF gene that affects the anticodon stem and loop of the tRNA, potentially altering the tertiary structure. The mutation was not found in 97 controls. Leukocyte mtDNA of the unaffected mother carried the same mutation. The disorder was multisystemic, but both patients were brought to medical attention for failure to thrive and chronic renal insufficiency. Additional features included delayed development, brain atrophy, ataxia, anemia, muscle weakness and atrophy, and lesions suggestive of stroke in deep brain regions. Renal ultrasound showed increased echogenicity, and biopsy showed tubulointerstitial nephropathy with sclerotic tufts and thickening of Bowman's capsule with evidence of fibrosis. Electron microscopy showed irregular mitochondria with crystalline inclusions and abnormal morphology, such as swollen intracristal spaces. </p>
</span>
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<div>
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<div>
<h4>
<span class="mim-font">
<strong>REFERENCES</strong>
</span>
</h4>
<div>
<p />
</div>
<div>
<ol>
<li>
<p class="mim-text-font">
Deschauer, M., Swalwell, H., Strauss, M., Zierz, S., Taylor, R. W.
<strong>Novel mitochondrial transfer RNA-phe gene mutation associated with late-onset neuromuscular disease.</strong>
Arch. Neurol. 63: 902-905, 2006.
[PubMed: 16769874]
[Full Text: https://doi.org/10.1001/archneur.63.6.902]
</p>
</li>
<li>
<p class="mim-text-font">
Goto, Y., Nonaka, I., Horai, S.
<strong>A mutation in the tRNA-leu (UUR) gene associated with the MELAS subgroup of mitochondrial encephalomyopathies.</strong>
Nature 348: 651-653, 1990.
[PubMed: 2102678]
[Full Text: https://doi.org/10.1038/348651a0]
</p>
</li>
<li>
<p class="mim-text-font">
Hanna, M. G., Nelson, I. P., Morgan-Hughes, J. A., Wood, N. W.
<strong>MELAS: a new disease associated mitochondrial DNA mutation and evidence for further genetic heterogeneity.</strong>
J. Neurol. Neurosurg. Psychiat. 65: 512-517, 1998.
[PubMed: 9771776]
[Full Text: https://doi.org/10.1136/jnnp.65.4.512]
</p>
</li>
<li>
<p class="mim-text-font">
Ling, J., Roy, H., Qin, D., Rubio, M. A. T., Alfonzo, J. D., Fredrick, K., Ibba, M.
<strong>Pathogenic mechanism of a human mitochondrial tRNA-Phe mutation associated with myoclonic epilepsy with ragged red fibers syndrome.</strong>
Proc. Nat. Acad. Sci. 104: 15299-15304, 2007.
[PubMed: 17878308]
[Full Text: https://doi.org/10.1073/pnas.0704441104]
</p>
</li>
<li>
<p class="mim-text-font">
Mancuso, M., Filosto, M., Mootha, V. K., Rocchi, A., Pistolesi, S., Murri, L., DiMauro, S., Siciliano, G.
<strong>A novel mitochondrial tRNA-phe mutation causes MERRF syndrome.</strong>
Neurology 62: 2119-2121, 2004.
[PubMed: 15184630]
[Full Text: https://doi.org/10.1212/01.wnl.0000127608.48406.f1]
</p>
</li>
<li>
<p class="mim-text-font">
Pavlakis, S. G., Phillips, P. C., DiMauro, S., De Vivo, D. C., Rowland, L. P.
<strong>Mitochondrial myopathy, encephalopathy, lactic acidosis, and strokelike episodes: a distinctive clinical syndrome.</strong>
Ann. Neurol. 16: 481-488, 1984.
[PubMed: 6093682]
[Full Text: https://doi.org/10.1002/ana.410160409]
</p>
</li>
<li>
<p class="mim-text-font">
Shapira, Y., Cederbaum, S. D., Cancilla, P. A., Nielsen, D., Lippe, B. M.
<strong>Familial poliodystrophy, mitochondrial myopathy, and lactic acidemia.</strong>
Neurology 25: 614-621, 1975.
[PubMed: 1171391]
[Full Text: https://doi.org/10.1212/wnl.25.7.614]
</p>
</li>
<li>
<p class="mim-text-font">
Tzen, C.-Y., Tsai, J.-D., Wu, T.-Y., Chen, B.-F., Chen, M.-L., Lin, S.-P., Chen, S.-C.
<strong>Tubulointerstitial nephritis associated with a novel mitochondrial point mutation.</strong>
Kidney Int. 59: 846-854, 2001.
[PubMed: 11231339]
[Full Text: https://doi.org/10.1046/j.1523-1755.2001.059003846.x]
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</li>
<li>
<p class="mim-text-font">
Young, T. M., Blakely, E. L., Swalwell, H., Carter, J. E., Kartsounis, L. D., O'Donovan, D. G., Turnbull, D. M., Taylor, R. W., de Silva, R. N.
<strong>Mitochondrial transfer RNA(Phe) mutation associated with a progressive neurodegenerative disorder characterized by psychiatric disturbance, dementia, and akinesia-rigidity.</strong>
Arch. Neurol. 67: 1399-1402, 2010.
[PubMed: 21060018]
[Full Text: https://doi.org/10.1001/archneurol.2010.283]
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<li>
<p class="mim-text-font">
Zaganelli, S., Rebelo-Guiomar, P., Maundrell, K., Rozanska, A., Pierredon, S., Powell, C. A., Jourdain, A. A., Hulo, N., Lightowlers, R. N., Chrzanowska-Lightowlers, Z. M., Minczuk, M., Martinou, J.-C.
<strong>The pseudouridine synthase RPUSD4 is an essential component of mitochondrial RNA granules.</strong>
J. Biol. Chem. 292: 4519-4532, 2017.
[PubMed: 28082677]
[Full Text: https://doi.org/10.1074/jbc.M116.771105]
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</li>
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<p class="mim-text-font">
Zsurka, G., Hampel, K. G., Nelson, I., Jardel, C., Mirandola, S. R., Sassen, R., Kornblum, C., Marcorelles, P., Lavoue, S., Lombes, A., Kunz, W. S.
<strong>Severe epilepsy as the major symptom of new mutations in the mitochondrial tRNA(Phe) gene.</strong>
Neurology 74: 507-512, 2010.
[PubMed: 20142618]
[Full Text: https://doi.org/10.1212/WNL.0b013e3181cef7ab]
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Elizabeth S. Partan - updated : 05/22/2017<br>Cassandra L. Kniffin - updated : 3/30/2011<br>Cassandra L. Kniffin - updated : 1/21/2011<br>Cassandra L. Kniffin - updated : 5/5/2010<br>Cassandra L. Kniffin - updated : 10/16/2007<br>Cassandra L. Kniffin - updated : 2/13/2007<br>Cassandra L. Kniffin - updated : 1/31/2005<br>Victor A. McKusick - updated : 2/15/1999
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Victor A. McKusick : 3/2/1993
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