M-1624-C-T

Position:

• chrM-1624-C-T

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM2 PP3 PP5_Very_Strong

The ENST00000387342.1(MT-TV):​n.23C>T variant causes a non coding transcript exon change. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency: Mitomap GenBank: 𝑓 0.0 (AC: 0)
• Consequence: MT-TV ENST00000387342.1 non_coding_transcript_exon
• Scores: Mitotip Uncertain 15
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3 O:1 Leigh-Syndrome
• Conservation: PhyloP100: 5.78

Genes affected

MT-TV (HGNC:7500): (mitochondrially encoded tRNA valine)

TRNV (HGNC:):

MT-RNR2 (HGNC:7471): (mitochondrially encoded 16S RNA) Enables G protein-coupled receptor binding activity; protein self-association; and receptor antagonist activity. Involved in several processes, including leukocyte chemotaxis; negative regulation of cell death; and negative regulation of neuroinflammatory response. Located in several cellular components, including mitochondrion; perinuclear region of cytoplasm; and sperm midpiece. [provided by Alliance of Genome Resources, Apr 2022]

MT-RNR1 (HGNC:7470): (mitochondrially encoded 12S RNA) Enables DNA binding activity and DNA-binding transcription factor binding activity. Involved in several processes, including osteoblast proliferation; regulation of carbohydrate utilization; and regulation of phosphate metabolic process. Located in extracellular space; mitochondrion; and nucleus. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Pathogenic. Variant got 11 ACMG points.

• PM2: Very low frequency in mitomap database: 0.0
• PP3: Mitotip and hmtvar scores support pathogenic criterium.
• PP5: Variant M-1624-C-T is Pathogenic according to our data. Variant chrM-1624-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 9549.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TRNV	TRNV.1	n.23C>T		non_coding_transcript_exon_variant	1/1
RNR2	RNR2.1			upstream_gene_variant
RNR1	RNR1.1			downstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MT-TV	ENST00000387342.1	n.23C>T		non_coding_transcript_exon_variant	1/1
MT-RNR2	ENST00000387347.2			upstream_gene_variant
MT-RNR1	ENST00000389680.2			downstream_gene_variant

Frequencies

GnomAD4 exome Cov.: 0

We have no GnomAD4 genomes data on this position. Probably position not covered by the project.

Mitomap GenBank AF: 0.0 AC: 0

Gnomad homoplasmic AF: 0.0 AC: 0 AN: 56433

Gnomad heteroplasmic AF: 0.000018 AC: 1 AN: 56433

Mitomap

Leigh-Syndrome

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Juvenile myopathy, encephalopathy, lactic acidosis AND stroke Pathogenic:2

Likely 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.1624C>T variant in MT-TV gene is interpreted to be a Likely Pathogenic variant based on the modified ACMG guidelines (unpublished). This variant meets the following evidence codes reported in the guidelines: PS3, PP3, PP4 -
Pathogenic, criteria provided, single submitter	clinical testing	Mendelics	May 04, 2022	- -

Leigh syndrome, mitochondrial Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Feb 01, 2002

- -

Leigh syndrome Other:1

not provided, no classification provided

literature only

GeneReviews

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
Mitotip	Uncertain	15
Hmtvar	Pathogenic	0.45

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs199476144; hg19: chrM-1626;