rs121434474
Variant summary
Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM2PP3PP5_Very_Strong
The ENST00000387441.1(MT-TH):n.10G>A variant causes a non coding transcript exon change. Variant has been reported in ClinVar as Likely pathogenic (★★★).
Frequency
Mitomap GenBank:
Absent
Consequence
MT-TH
ENST00000387441.1 non_coding_transcript_exon
ENST00000387441.1 non_coding_transcript_exon
Scores
Mitotip
Pathogenic
Clinical Significance
MERRF-MELAS-/-Encephalopathy
Conservation
PhyloP100: 6.27
Genes affected
MT-TH (HGNC:7487): (mitochondrially encoded tRNA histidine)
MT-ND4 (HGNC:7459): (mitochondrially encoded NADH dehydrogenase 4) Enables NADH dehydrogenase (ubiquinone) activity. Involved in mitochondrial electron transport, NADH to ubiquinone and mitochondrial respiratory chain complex I assembly. Part of mitochondrial respiratory chain complex I. Implicated in Leber hereditary optic neuropathy; Parkinson's disease; macular degeneration; and schizophrenia. Biomarker of Alzheimer's disease. [provided by Alliance of Genome Resources, Apr 2022]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 11 ACMG points.
PM2
?
No frequency data in Mitomap. Probably very rare.
PP3
?
Mitotip and hmtvar scores support pathogenic criterium.
PP5
?
Variant M-12147-G-A is Pathogenic according to our data. Variant chrM-12147-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 9610.Status of the report is reviewed_by_expert_panel, 3 stars.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
TRNH | TRNH.1 use as main transcript | n.10G>A | non_coding_transcript_exon_variant | 1/1 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
MT-TH | ENST00000387441.1 | n.10G>A | non_coding_transcript_exon_variant | 1/1 | |||||
MT-ND4 | ENST00000361381.2 | downstream_gene_variant | P1 |
Frequencies
GnomAD4 exome Cov.: 0
GnomAD4 exome
Cov.:
0
We have no GnomAD4 genomes data on this position. Probably position not covered by the project.
Mitomap
MERRF-MELAS-/-Encephalopathy
ClinVar
Significance: Likely pathogenic
Submissions summary: Pathogenic:4Other:1
Revision: reviewed by expert panel
LINK: link
Submissions by phenotype
Mitochondrial disease Pathogenic:2
Likely pathogenic, reviewed by expert panel | curation | ClinGen Mitochondrial Disease Nuclear and Mitochondrial Variant Curation Expert Panel, ClinGen | Jan 09, 2023 | The m.12147G>A variant in MT-TH has been reported in two unrelated probands with features of primary mitochondrial disease. Both individuals were males with symptom onset in late teens to early 20s, developed seizures, and had COX-negative fibers identified on muscle biopsy. One individual also had ragged red fibers, and complex I and IV deficiencies. Additional features seen include sensorineural hearing loss, optic atrophy, ptosis, migraines, ataxia, myoclonus, muscle weakness, hepatic failure consistent with Reye syndrome, lactic acidosis, and hyperCKemia. Heteroplasmy in the affected individuals ranged from 86% in muscle to undetectable in hair (PS4_supporting; PMIDs: 14967777, 15111688). This variant occurred de novo in one individual (absent in blood, urine, hair, and muscle from mother as well as two sisters, two maternal aunts, and two maternal uncles; PM6, PMID: 15111688). The computational predictor MitoTIP suggests this variant is pathogenic (93.5 percentile) and HmtVAR predicts it to be pathogenic score of 1 (PP3). This variant is absent in the GenBank dataset, Helix dataset, and gnomAD v3.1.2 (PM2_supporting). Single fiber testing was performed in muscle fibers from both affected individuals, supporting the functional impact of this variant (PS3_supporting). In one individual, the mean heteroplasmy level in abnormal fibers was 90% ± 2% (n=22) and in normal fibers was 58% ± 6% (n=15; P = 0.007). Furthermore, in ragged red fibers, the mean heteroplasmy level was 94% (PMID: 14967777). In the other individual, the mean heteroplasmy level in COX-deficient fibers was 94.6 ± 1.53% (n = 12) and in COX-positive fibers was 32.5 ± 6.18% (n = 10; p < 0.0001; PMID: 15111688). In summary, this variant meets criteria to be classified as likely pathogenic 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 January 9, 2023. Mitochondrial DNA-specific ACMG/AMP criteria applied (PMID: 32906214): PS4_supporting, PM6, PM2_supporting, PP3, PS3_supporting. - |
Pathogenic, criteria provided, single submitter | clinical testing | Mendelics | May 04, 2022 | - - |
Juvenile myopathy, encephalopathy, lactic acidosis AND stroke Pathogenic:1Other:1
Pathogenic, criteria provided, single submitter | clinical testing | Wong Mito Lab, Molecular and Human Genetics, Baylor College of Medicine | Jul 12, 2019 | The NC_012920.1:m.12147G>A variant in MT-TH gene is interpreted to be a Pathogenic variant based on the modified ACMG guidelines (unpublished). This variant meets the following evidence codes reported in the guidelines: PS3, PM7, PM8, PM9 - |
not provided, no classification provided | literature only | GeneReviews | - | - - |
MERRF/MELAS overlap syndrome Pathogenic:1
Pathogenic, no assertion criteria provided | literature only | OMIM | Apr 27, 2004 | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
Mitotip
Pathogenic
Hmtvar
Pathogenic
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at