ClinVar Miner

Submissions for variant NC_012920.1(MT-TG):m.9997T>C

dbSNP: rs121434475
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Total submissions: 3
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
ClinGen Mitochondrial Disease Nuclear and Mitochondrial Variant Curation Expert Panel, ClinGen RCV004691090 SCV005187323 uncertain significance Mitochondrial disease 2024-07-22 reviewed by expert panel curation The m.9997T>C variant in MT-TG has been reported in one large family to date (PMID: 8079988). The most common clinical feature in affected family members was cardiomyopathy, however additional clinical features seen include renal failure, muscle cramps, muscle weakness, exercise intolerance, and gastrointestinal dysmotility. Heteroplasmy levels were variable in affected family members and appeared to segregate with cardiomyopathy but not the other clinical features (PMID: 8079988). This variant is present in population databases (absent in gnomAD v3.1.2; one heteroplasmic in the Helix dataset; one homoplasmic occurrence in the Mitomap GenBank sequences; PM2_supporting). Cybrid studies support the deleterious effect of this variant (PMID: 10090480; PS3_supporting). The computational predictor MitoTIP suggests this variant is deleterious (80.3 percentile) and HmtVAR predicts it to be deleterious with a score of 0.35 (PP3). In summary, this variant meets criteria to be classified as uncertain significance for primary mitochondrial disease inherited in a mitochondrial manner. This classification was approved by the NICHD/NINDS U24 ClinGen Mitochondrial Disease Variant Curation Expert Panel on July 22, 2024. Mitochondrial DNA-specific ACMG/AMP criteria applied (PMID: 32906214): PM2_supporting, PS3_supporting, PP3.
Mendelics RCV002247295 SCV002518303 uncertain significance not specified 2022-05-04 criteria provided, single submitter clinical testing
OMIM RCV000010235 SCV000030459 pathogenic Primary familial hypertrophic cardiomyopathy 1994-09-01 no assertion criteria provided literature only

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