1-226961447-C-A

Variant summary

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

The NM_020247.5(COQ8A):c.62C>A(p.Ala21Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000479 in 1,461,450 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A21V) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: COQ8A NM_020247.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.20

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 Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COQ8A	NM_020247.5	c.62C>A	p.Ala21Glu	missense_variant	2/15	ENST00000366777.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COQ8A	ENST00000366777.4	c.62C>A	p.Ala21Glu	missense_variant	2/15	1	NM_020247.5	P1
COQ8A	ENST00000366778.5	c.-34-61C>A		intron_variant		1
COQ8A	ENST00000489044.1	n.273C>A		non_coding_transcript_exon_variant	2/5	3
COQ8A	ENST00000478406.5	n.107-16002C>A		intron_variant, non_coding_transcript_variant		2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000479 AC: 7 AN: 1461450 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 727042

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000629

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Mar 03, 2023

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on COQ8A protein function. This variant has not been reported in the literature in individuals affected with COQ8A-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces alanine, which is neutral and non-polar, with glutamic acid, which is acidic and polar, at codon 21 of the COQ8A protein (p.Ala21Glu). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.51
BayesDel_addAF	Uncertain	0.038	T
BayesDel_noAF	Benign	-0.18
Cadd	Benign	20
Dann	Uncertain	0.99
DEOGEN2	Benign	0.23	T;T
Eigen	Benign	-0.023
Eigen_PC	Benign	-0.070
FATHMM_MKL	Benign	0.71	D
M_CAP	Uncertain	0.13	D
MetaRNN	Uncertain	0.73	D;D
MetaSVM	Uncertain	-0.21	T
MutationTaster	Benign	1.0	D;D;D;D;D;N
PrimateAI	Benign	0.38	T
PROVEAN	Benign	-1.4	N;N
REVEL	Uncertain	0.42
Sift	Uncertain	0.0040	D;D
Sift4G	Uncertain	0.0070	D;D
Polyphen		0.97	D;D
Vest4		0.70
MutPred		0.46		Gain of helix (P = 0.0022);Gain of helix (P = 0.0022);
MVP		0.88
MPC		0.30
ClinPred		0.91	D
GERP RS		3.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.1
Varity_R		0.26
gMVP		0.77

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr1-227149148;