1-226961452-G-A

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4_Strong BP6

The NM_020247.5(COQ8A):c.67G>A(p.Val23Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000881 in 1,613,846 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V23A) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.00054 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00092 (2 hom.)
• Consequence: COQ8A NM_020247.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5 B:3
• Conservation: PhyloP100: -0.394

Genes affected

COQ8A (HGNC:16812): (coenzyme Q8A) This gene encodes a mitochondrial protein similar to yeast ABC1, which functions in an electron-transferring membrane protein complex in the respiratory chain. It is not related to the family of ABC transporter proteins. Expression of this gene is induced by the tumor suppressor p53 and in response to DNA damage, and inhibiting its expression partially suppresses p53-induced apoptosis. Alternatively spliced transcript variants have been found; however, their full-length nature has not been determined. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_benign. Variant got -5 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.04414758).
• BP6: Variant 1-226961452-G-A is Benign according to our data. Variant chr1-226961452-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 136295.We mark this variant Likely_benign, oryginal submissions are: {Benign=2, Likely_benign=1, Uncertain_significance=4}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COQ8A	NM_020247.5	c.67G>A	p.Val23Met	missense_variant	2/15	ENST00000366777.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COQ8A	ENST00000366777.4	c.67G>A	p.Val23Met	missense_variant	2/15	1	NM_020247.5	P1
COQ8A	ENST00000366778.5	c.-34-56G>A		intron_variant		1
COQ8A	ENST00000489044.1	n.278G>A		non_coding_transcript_exon_variant	2/5	3
COQ8A	ENST00000478406.5	n.107-15997G>A		intron_variant, non_coding_transcript_variant		2

Frequencies

GnomAD3 genomes AF: 0.000539 AC: 82 AN: 152256 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.000217

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

Gnomad ASJ AF: 0.000288

Gnomad EAS AF: 0.000578

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.0000941

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000941

Gnomad OTH AF: 0.000956

GnomAD3 exomes AF: 0.000526 AC: 132 AN: 251144 Hom.: 1 AF XY: 0.000552 AC XY: 75 AN XY: 135832

Gnomad AFR exome AF: 0.0000616

Gnomad AMR exome AF: 0.000145

Gnomad ASJ exome AF: 0.0000993

Gnomad EAS exome AF: 0.000109

Gnomad SAS exome AF: 0.000131

Gnomad FIN exome AF: 0.000139

Gnomad NFE exome AF: 0.00101

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.000917 AC: 1340 AN: 1461472 Hom.: 2 Cov.: 31 AF XY: 0.000897 AC XY: 652 AN XY: 727060

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.000157

Gnomad4 ASJ exome AF: 0.000115

Gnomad4 EAS exome AF: 0.000327

Gnomad4 SAS exome AF: 0.0000464

Gnomad4 FIN exome AF: 0.0000943

Gnomad4 NFE exome AF: 0.00115

Gnomad4 OTH exome AF: 0.000381

GnomAD4 genome AF: 0.000538 AC: 82 AN: 152374 Hom.: 0 Cov.: 33 AF XY: 0.000537 AC XY: 40 AN XY: 74506

Gnomad4 AFR AF: 0.000216

Gnomad4 AMR AF: 0.000131

Gnomad4 ASJ AF: 0.000288

Gnomad4 EAS AF: 0.000579

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.0000941

Gnomad4 NFE AF: 0.000941

Gnomad4 OTH AF: 0.000946

Alfa AF: 0.000877 Hom.: 0

Bravo AF: 0.000570

TwinsUK AF: 0.00189 AC: 7

ALSPAC AF: 0.000778 AC: 3

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.00105 AC: 9

ExAC AF: 0.000527 AC: 64

EpiCase AF: 0.000818

EpiControl AF: 0.000771

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:5 Benign:3

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:2 Benign:2

Uncertain significance, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Sep 01, 2020	- -
Uncertain significance, no assertion criteria provided	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Feb 24, 2016	- -
Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Nov 26, 2021	- -
Likely benign, criteria provided, single submitter	clinical testing	Invitae	Jan 18, 2024	- -

Autosomal recessive ataxia due to ubiquinone deficiency Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -
Uncertain significance, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Nov 30, 2021	- -

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 15, 2022

The c.67G>A (p.V23M) alteration is located in exon 2 (coding exon 1) of the COQ8A gene. This alteration results from a G to A substitution at nucleotide position 67, causing the valine (V) at amino acid position 23 to be replaced by a methionine (M). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not specified Benign:1

Benign, criteria provided, single submitter

clinical testing

GeneDx

Feb 14, 2013

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.091
BayesDel_addAF	Benign	-0.39	T
BayesDel_noAF	Benign	-0.34
Cadd	Benign	14
Dann	Uncertain	0.99
DEOGEN2	Benign	0.15	T;T
Eigen	Benign	-0.48
Eigen_PC	Benign	-0.61
FATHMM_MKL	Benign	0.037	N
M_CAP	Benign	0.064	D
MetaRNN	Benign	0.044	T;T
MetaSVM	Benign	-0.50	T
MutationTaster	Benign	0.98	D;D;D;N;N;N
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-0.67	N;N
REVEL	Benign	0.23
Sift	Uncertain	0.013	D;D
Sift4G	Uncertain	0.026	D;D
Polyphen		0.92	P;P
Vest4		0.26
MVP		0.73
MPC		0.049
ClinPred		0.022	T
GERP RS		-1.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.084
gMVP		0.24

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: rs35582308; hg19: chr1-227149153;