M-5705-A-G

Variant names:

• chrM-5705-A-G
• rs1556423024
• unassigned_transcript_4796:c.25T>C

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP6_Moderate BS2

Variant has been reported in ClinVar as Likely benign (★).

• Frequency: Mitomap GenBank: 𝑓 0.00020 (AC: 12)
• Consequence: TRNN missense
• Scores: Mitotip Benign 0.37
• Clinical Significance: Likely benign criteria provided, single submitter B:1 No linked disesase in Mitomap
• Conservation: PhyloP100: 2.73

Genes affected

TRNN (HGNC:7493): (mitochondrially encoded tRNA asparagine)

COX1 (HGNC:7419): (mitochondrially encoded cytochrome c oxidase I) Contributes to cytochrome-c oxidase activity. Predicted to be involved in electron transport coupled proton transport and mitochondrial electron transport, cytochrome c to oxygen. Part of mitochondrial respiratory chain complex III and mitochondrial respiratory chain complex IV. [provided by Alliance of Genome Resources, Apr 2022]

TRNA (HGNC:7475): (mitochondrially encoded tRNA alanine)

ND2 (HGNC:7456): (mitochondrially encoded NADH dehydrogenase 2) 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; multiple sclerosis; myocardial infarction; neurodegenerative disease (multiple); and urinary bladder cancer. [provided by Alliance of Genome Resources, Apr 2022]

TRNW (HGNC:7501): (mitochondrially encoded tRNA tryptophan)

TRNC (HGNC:7477): (mitochondrially encoded tRNA cysteine)

TRNY (HGNC:7502): (mitochondrially encoded tRNA tyrosine)

ACMG classification

Verdict is Likely_benign. Variant got -6 ACMG points.

• BP6: Variant M-5705-A-G is Benign according to our data. Variant chrM-5705-A-G is described in ClinVar as [Likely_benign]. Clinvar id is 689977.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS2: High AC in GnomadMitoHomoplasmic at 12

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TRNN	unassigned_transcript_4796	c.25T>C	p.Cys9Arg	missense_variant	Exon 1 of 1
COX1	unassigned_transcript_4799	c.-199A>G		upstream_gene_variant
TRNA	unassigned_transcript_4795	c.-50T>C		upstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt

Frequencies

GnomAD4 exome Cov.: 0

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

Mitomap GenBank AF: 0.00020 AC: 12

Gnomad homoplasmic AF: 0.00021 AC: 12 AN: 56433

Gnomad heteroplasmic AF: 0.000018 AC: 1 AN: 56433

Mitomap

No disease associated.

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

MELAS syndrome Benign:1

Jul 12, 2019

Wong Mito Lab, Molecular and Human Genetics, Baylor College of Medicine

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The NC_012920.1:m.5705A>G variant in MT-TN gene is interpreted to be a Likely Benign variant based on the modified ACMG guidelines (unpublished). This variant meets the following evidence codes reported in the guidelines: BS1, BP4, BP5, BP6 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
Mitotip	Benign	0.37
Hmtvar	Benign	0.050

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1556423024; hg19: chrM-5706;