chrM-15437-G-A

Variant names:

• chrM-15437-G-A
• rs878853058
• ENST00000361789.2:c.691G>A

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4 BS2

The ENST00000361789.2(MT-CYB):​c.691G>A​(p.Gly231Ser) variant causes a missense change involving the alteration of a conserved nucleotide. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency: Mitomap GenBank: 𝑓 0.0 (AC: 0)
• Consequence: MT-CYB ENST00000361789.2 missense
• Scores: Apogee2 Benign 0.25
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3 No linked disesase in Mitomap
• Conservation: PhyloP100: 7.40
• Publications: 1 publications found

Genes affected

MT-CYB (HGNC:7427): (mitochondrially encoded cytochrome b) Predicted to enable metal ion binding activity. Predicted to be involved in several processes, including electron transport coupled proton transport; response to cobalamin; and response to glucagon. Located in mitochondrion. Implicated in ovarian carcinoma and urinary bladder cancer. [provided by Alliance of Genome Resources, Apr 2022]

MT-CYB Gene-Disease associations (from GenCC):

• mitochondrial disease

  Inheritance: Mitochondrial Classification: DEFINITIVE Submitted by: ClinGen
• mitochondrial complex III deficiency

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• Leber hereditary optic neuropathy

  Inheritance: Mitochondrial Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very low frequency in mitomap database: 0.0
• BP4: Apogee2 supports a benign effect, 0.24851789 < 0.5 .
• BS2: High AC in GnomadMitoHomoplasmic at 4

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CYTB	unassigned_transcript_4818	c.691G>A	p.Gly231Ser	missense_variant	Exon 1 of 1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MT-CYB	ENST00000361789.2	c.691G>A	p.Gly231Ser	missense_variant	Exon 1 of 1	6		ENSP00000354554.2

Frequencies

Mitomap GenBank AF: 0.0 AC: 0

Gnomad homoplasmic AF: 0.000071 AC: 4 AN: 56418

Gnomad heteroplasmic AF: 0.00011 AC: 6 AN: 56418

Mitomap

No disease associated.

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Leigh syndrome Uncertain:1

Oct 17, 2019

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

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The NC_012920.1:m.15437G>A (YP_003024038.1:p.Gly231Ser) variant in MTCYB gene is interpretated to be a Uncertain Significance variant based on the modified ACMG guidelines (unpublished). This variant meets the following evidence codes: PM9, PP6, PP7 -

MELAS syndrome;C0917796:Leber optic atrophy Uncertain:1

Oct 31, 2018

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Uncertain:1

Sep 25, 2015

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
Apogee2	Benign	0.25
Hmtvar	Pathogenic	0.78
AlphaMissense	Benign	0.32
PhyloP100		7.4
Mutation Taster		=26/74	disease causing

Other links and lift over

dbSNP: rs878853058; hg19: chrM-15438;