chrM-9214-A-G

Position:

• chrM-9214-A-G

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 0P and 7B. BP4 BP6_Moderate BS2

The ENST00000362079.2(MT-CO3):​c.8A>G​(p.His3Arg) variant causes a missense change. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Another nucleotide change resulting in same amino acid change has been previously reported as Likely benignin UniProt.

• Frequency: Mitomap GenBank: 𝑓 0.00050 (AC: 30)
• Consequence: MT-CO3 ENST00000362079.2 missense
• Scores: Apogee2 Benign 0.10
• Clinical Significance: Likely benign criteria provided, single submitter B:1 No linked disesase in Mitomap
• Conservation: PhyloP100: 7.17

Genes affected

COX3 (HGNC:):

MT-CO3 (HGNC:7422): (mitochondrially encoded cytochrome c oxidase III) Predicted to enable electron transfer activity and oxidoreduction-driven active transmembrane transporter activity. Involved in respiratory chain complex IV assembly. Part of respiratory chain complex IV. Implicated in MELAS syndrome. [provided by Alliance of Genome Resources, Apr 2022]

MT-ATP6 (HGNC:7414): (mitochondrially encoded ATP synthase 6) Contributes to proton-transporting ATP synthase activity, rotational mechanism. Involved in mitochondrial ATP synthesis coupled proton transport. Part of mitochondrial proton-transporting ATP synthase complex. Implicated in Leber hereditary optic neuropathy; NARP syndrome; Parkinson's disease; multiple sclerosis; and systemic lupus erythematosus. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Benign. Variant got -7 ACMG points.

• BP4: Apogee2 supports a benign effect, 0.103765 < 0.5 .
• BP6: Variant M-9214-A-G is Benign according to our data. Variant chrM-9214-A-G is described in ClinVar as [Likely_benign]. Clinvar id is 693127.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS2: High AC in GnomadMitoHomoplasmic at 19

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COX3	COX3.1	c.8A>G	p.His3Arg	missense_variant	1/1
ATP6	ATP6.1			downstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MT-CO3	ENST00000362079.2	c.8A>G	p.His3Arg	missense_variant	1/1			P1
MT-ATP6	ENST00000361899.2			downstream_gene_variant				P1

Frequencies

GnomAD4 exome Cov.: 0

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

Mitomap GenBank AF: 0.00050 AC: 30

Gnomad homoplasmic AF: 0.00034 AC: 19 AN: 56430

Gnomad heteroplasmic AF: 0.000035 AC: 2 AN: 56430

Alfa AF: 0.00223 Hom.: 9

Mitomap

No disease associated.

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Leigh syndrome Benign:1

Likely benign, 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.9214A>G (YP_003024032.1:p.His3Arg) variant in MTCO3 gene is interpretated to be a Likely Benign variant based on the modified ACMG guidelines (unpublished). This variant meets the following evidence codes: BS1, BP6 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
Apogee2	Benign	0.10
Hmtvar	Pathogenic	0.55
AlphaMissense	Benign	0.16
BayesDel_addAF	Benign	-0.28	T
DEOGEN2	Benign	0.063	T
LIST_S2	Benign	0.72	T
MutationAssessor	Uncertain	2.2	M
MutationTaster	Benign	1.0	N
PROVEAN	Uncertain	-2.4	N
Sift	Uncertain	0.010	D
Sift4G	Uncertain	0.022	D
GERP RS		5.0
Varity_R		0.21

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1556423637; hg19: chrM-9215; COSMIC: COSV62294368; COSMIC: COSV62294368;