rs28679680

Variant names:

• chrM-6930-G-A
• rs28679680
• unassigned_transcript_4799:c.1027G>A

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM2 PP5_Very_Strong

In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★★).

• Frequency: Mitomap GenBank: Absent
• Consequence: COX1 missense
• Clinical Significance: Likely pathogenic reviewed by expert panel P:2 Multisystem-Disorder
• Conservation: PhyloP100: 9.54

Genes affected

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]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PM2: No frequency data in Mitomap. Probably very rare.
• PP5: Variant M-6930-G-A is Pathogenic according to our data. Variant chrM-6930-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 9668.Status of the report is reviewed_by_expert_panel, 3 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COX1	unassigned_transcript_4799	c.1027G>A	p.Gly343Arg	missense_variant	Exon 1 of 1

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

Multisystem-Disorder

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: reviewed by expert panel

Submissions by phenotype

Mitochondrial disease Pathogenic:1

Jan 22, 2024

ClinGen Mitochondrial Disease Nuclear and Mitochondrial Variant Curation Expert Panel, ClinGen

Significance: Likely pathogenic

Review Status: reviewed by expert panel

Collection Method: curation

The m.6930G>A (p.G343Ter) variant in MT-CO1 has been reported in one individual to date, in a woman with a multisystem disorder (PMID: 10441567). Clinical features included cataracts, profound sensorineural hearing loss, myoclonic epilepsy, cerebellar ataxia, progressive muscle weakness and atrophy, progressive vision loss due to optic atrophy, and a severe sensorimotor neuropathy. Brain imaging showed diffuse cerebellar atrophy and bilateral small symmetrical nodular hyperintensities in the basal ganglia (head of the caudatus and putamen). She had elevated blood lactate (5.8 mM, normal 0.1-2.2) and CK (1000 UI/L; normal <150). Muscle biopsy showed that only 10% of fibers showed normal COX staining and her complex IV activity was 10% of controls. The variant was present at 27% heteroplasmy in blood, 75% in muscle, and 33% in myoblasts. As this is the only case reported to date, PS4 could not be applied. The variant was absent in blood from her mother, sister, and four maternal aunts (PM6_supporting). Computational predictors are not applicable for this variant type precluding consideration for PP3 or BP4. This variant is absent in the GenBank dataset, Helix dataset, and gnomAD v3.1.2 (PM2_supporting). This variant results in loss of the last 170 amino acids (33% of the protein, PVS1_strong). Cybrid studies supported the functional impact of this variant (PS3_supporting; PMIDs: 10441567, 11595737). 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 22, 2024. Mitochondrial DNA-specific ACMG/AMP criteria applied (PMID: 32906214): PM6_supporting, PM2_supporting, PS3_supporting, PVS1_strong. -

Mitochondrial complex IV deficiency, nuclear type 1 Pathogenic:1

Sep 01, 1999

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.69	D
DEOGEN2	Uncertain	0.45	T
LIST_S2	Pathogenic	0.98	D
MutationAssessor	Pathogenic	5.6	H
PROVEAN	Pathogenic	-5.0	D
GERP RS		5.0
Varity_R		0.88

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs28679680; hg19: chrM-6931;