2-42351347-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_004718.4(COX7A2L):c.217G>A(p.Val73Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,636 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: COX7A2L NM_004718.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.165

Genes affected

COX7A2L (HGNC:2289): (cytochrome c oxidase subunit 7A2 like) Cytochrome c oxidase (COX), the terminal component of the mitochondrial respiratory chain, catalyzes the electron transfer from reduced cytochrome c to oxygen. This component is a heteromeric complex consisting of 3 catalytic subunits encoded by mitochondrial genes and multiple structural subunits encoded by nuclear genes. The mitochondrially-encoded subunits function in electron transfer, and the nuclear-encoded subunits may function in the regulation and assembly of the complex. This nuclear gene encodes a protein similar to polypeptides 1 and 2 of subunit VIIa in the C-terminal region, and also highly similar to the mouse Sig81 protein sequence. This gene is expressed in all tissues, and upregulated in a breast cancer cell line after estrogen treatment. It is possible that this gene represents a regulatory subunit of COX and mediates the higher level of energy production in target cells by estrogen. Several transcript variants, some protein-coding and others non-protein coding, have been found for this gene. [provided by RefSeq, Jan 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.20878461).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COX7A2L	NM_004718.4	c.217G>A	p.Val73Met	missense_variant	3/3	ENST00000234301.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COX7A2L	ENST00000234301.3	c.217G>A	p.Val73Met	missense_variant	3/3	1	NM_004718.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461636 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727100

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.0000448

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.0000340

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 02, 2024

The c.217G>A (p.V73M) alteration is located in exon 3 (coding exon 3) of the COX7A2L gene. This alteration results from a G to A substitution at nucleotide position 217, causing the valine (V) at amino acid position 73 to be replaced by a methionine (M). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.095
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.45
Cadd	Benign	18
Dann	Uncertain	0.98
DEOGEN2	Benign	0.042	T;T
Eigen	Benign	-0.51
Eigen_PC	Benign	-0.52
FATHMM_MKL	Benign	0.13	N
M_CAP	Benign	0.0068	T
MetaRNN	Benign	0.21	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.1	L;L
MutationTaster	Benign	0.96	N;N
PrimateAI	Benign	0.42	T
PROVEAN	Benign	-1.3	N;N
REVEL	Benign	0.055
Sift	Uncertain	0.010	D;D
Sift4G	Benign	0.14	T;T
Polyphen		0.41	B;B
Vest4		0.28
MutPred		0.36		Loss of catalytic residue at V73 (P = 0.0997);Loss of catalytic residue at V73 (P = 0.0997);
MVP		0.52
MPC		0.0078
ClinPred		0.29	T
GERP RS		0.89
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.052
gMVP		0.61

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs1670639457; hg19: chr2-42578487;