rs199476105
Variant summary
Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PP3PS4PM6PS3_SupportingPP1_Moderate
This summary comes from the ClinGen Evidence Repository: The m.14459G>A (p.A72V) variant in MT-ND6 was reviewed by the Mitochondrial Disease Nuclear and Mitochondrial Variant Curation Expert Panel as part of the variant pilot for mitochondrial DNA variant specifications (McCormick et al., 2020; PMID:32906214). This variant has been reported in >16 individuals with primary mitochondrial disease with variable features ranging from Leber Hereditary Optic Neuropathy (LHON) with or without dystonia, Leigh syndrome, bilateral basal ganglia lesions, ataxia, and migraines (PS4; PMIDs: 8016139, 7654063, 16380132, 10894222, 14735584, 21749722, 14735585, 28503604, 32045392, 29408632, 22426787). This variant has been identified as a de novo occurrence in at least 2 probands with primary mitochondrial disease (PM6; PMIDs: 14735584, 10894222). This variant heteroplasmy level segregated with severity in six family members from four families (PP1_moderate; PMIDs: 22426787, 21749722, 7654063, 8016139). The computational predictor APOGEE gives a consensus rating of pathogenic with a score of 0.93 (Min=0, Max=1), which predicts a damaging effect on gene function (PP3). Cybrid studies supported the functional impact of this variant including a deficiency seen in patient cell line that was transferred to cybrids with a high mutant load and study was reproducible (PS3_supporting; PMID:8622678). In summary, this variant meets criteria to be classified as pathogenic for primary mitochondrial disease inherited in a mitochondrial manner. This classification was approved by the NICHD U24 ClinGen Mitochondrial Disease Variant Curation Expert Panel as of August 20, 2020. Mitochondrial DNA-specific ACMG/AMP criteria applied: PS4, PM6, PP1_moderate, PP3, PS3_supporting. LINK:https://erepo.genome.network/evrepo/ui/classification/CA120625/MONDO:0044970/014
Frequency
Consequence
ENST00000361681.2 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Pathogenic. Variant got 10 ACMG points.
Transcripts
RefSeq
| Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
|---|
Ensembl
| Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
|---|---|---|---|---|---|---|---|---|---|
| MT-ND6 | ENST00000361681.2 | c.215C>T | p.Ala72Val | missense_variant | 1/1 | P1 |
Frequencies
GnomAD4 exome Cov.: 0
Mitomap
ClinVar
Submissions by phenotype
Leber optic atrophy Pathogenic:3Other:1
| Pathogenic, criteria provided, single submitter | clinical testing | Mendelics | May 04, 2022 | - - |
| Pathogenic, no assertion criteria provided | literature only | OMIM | Apr 15, 2006 | - - |
| Pathogenic, no assertion criteria provided | clinical testing | Genomics England Pilot Project, Genomics England | - | - - |
| not provided, no classification provided | literature only | GeneReviews | - | This mitochondrial DNA variant affects function. It hase been identified in at least two independent LHON pedigrees and segregates with affected disease status. - |
Leigh syndrome Pathogenic:2Other:1
| not provided, no classification provided | literature only | GeneReviews | - | - - |
| Pathogenic, criteria provided, single submitter | clinical testing | Breda Genetics srl | Feb 11, 2021 | The variant m.14459G> A (p.Ala72Val) in the MT-ND6 gene is reported as pathogenic for Leigh syndrome and Leber hereditary optic neuropathy (LHON) in ClinVar (Variation ID: 9689) and is cited as pathogenic mutation in MITOMAP. The variant was identified in three out of 51836 sequences of the entire mitochondrial DNA (frequency 0.006%, GenBank, MITOMAP). This variant has previously been reported in patients with phenotypes ranging from Leigh or Leigh-like syndrome to Leber Hereditary Optic Neuropathy (LHON) plus dystonia, pure dystonia, pure LHON, or clinically asymptomatic. Jun et al. (1994) identified the variant m.14459G> A in heteroplasmy in a family with LHON and dystonia. Shoffner et al. (1995) identified the m.14459G> A mutation in a mother and daughter with isolated LHON (the daughter also had unilateral basal ganglia lesions on MRI). Kirby et al. (2000) identified the homoplasmic variant m.14459G> A in 3 patients with Leigh syndrome in whom there was no evidence of LHON or dystonia. Gropman and colleagues (2004) identified the m.14459G> A variant in a family with a broad spectrum of clinical manifestations. The proband presented with anarthria, dystonia, spasticity, and mild encephalopathy; MRI showed symmetrical and bilateral hyperintense lesions in the basal ganglia associated with cerebral and systemic lactic acidosis. Among other family members with the mutation, some were asymptomatic and others were symptomatic with varying clinical and laboratory characteristics, confirming the heterogeneous phenotype of this mutation even within the same family (OMIM * 516006). - |
| Pathogenic, criteria provided, single submitter | clinical testing | Wong Mito Lab, Molecular and Human Genetics, Baylor College of Medicine | Oct 17, 2019 | The NC_012920.1:m.14459G>A (YP_003024037.1:p.Ala72Val) variant in MTND6 gene is interpretated to be a Pathogenic variant based on the modified ACMG guidelines (unpublished). This variant meets the following evidence codes: PS1, PM9, PM10, PP4, PP6 - |
Leber optic atrophy and dystonia Pathogenic:1
| Pathogenic, no assertion criteria provided | literature only | OMIM | Apr 15, 2006 | - - |
Leigh syndrome due to mitochondrial complex I deficiency Pathogenic:1
| Pathogenic, no assertion criteria provided | literature only | OMIM | Apr 15, 2006 | - - |
Mitochondrial disease Pathogenic:1
| Pathogenic, reviewed by expert panel | curation | ClinGen Mitochondrial Disease Nuclear and Mitochondrial Variant Curation Expert Panel, ClinGen | Nov 01, 2021 | The m.14459G>A (p.A72V) variant in MT-ND6 was reviewed by the Mitochondrial Disease Nuclear and Mitochondrial Variant Curation Expert Panel as part of the variant pilot for mitochondrial DNA variant specifications (McCormick et al., 2020; PMID: 32906214). This variant has been reported in >16 individuals with primary mitochondrial disease with variable features ranging from Leber Hereditary Optic Neuropathy (LHON) with or without dystonia, Leigh syndrome, bilateral basal ganglia lesions, ataxia, and migraines (PS4; PMIDs: 8016139, 7654063, 16380132, 10894222, 14735584, 21749722, 14735585, 28503604, 32045392, 29408632, 22426787). This variant has been identified as a de novo occurrence in at least 2 probands with primary mitochondrial disease (PM6; PMIDs: 14735584, 10894222). This variant heteroplasmy level segregated with severity in six family members from four families (PP1_moderate; PMIDs: 22426787, 21749722, 7654063, 8016139). The computational predictor APOGEE gives a consensus rating of pathogenic with a score of 0.93 (Min=0, Max=1), which predicts a damaging effect on gene function (PP3). Cybrid studies supported the functional impact of this variant including a deficiency seen in patient cell line that was transferred to cybrids with a high mutant load and study was reproducible (PS3_supporting; PMID: 8622678). In summary, this variant meets criteria to be classified as pathogenic for primary mitochondrial disease inherited in a mitochondrial manner. This classification was approved by the NICHD U24 ClinGen Mitochondrial Disease Variant Curation Expert Panel as of August 20, 2020. Mitochondrial DNA-specific ACMG/AMP criteria applied: PS4, PM6, PP1_moderate, PP3, PS3_supporting. - |
not provided Pathogenic:1
| Pathogenic, criteria provided, single submitter | clinical testing | Clinical Genetics Laboratory, Skane University Hospital Lund | Sep 18, 2023 | - - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at