rs373083392

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP4_ModerateBS2

The NM_020247.5(COQ8A):c.1057C>T(p.Arg353Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000156 in 1,591,862 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. R353R) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00016 ( 0 hom., cov: 34)

Exomes 𝑓: 0.00016 ( 2 hom. )

Consequence

COQ8A
NM_020247.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 2.13

Publications

1 publications found

Variant links:

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]

COQ8A Gene-Disease associations (from GenCC):

autosomal recessive ataxia due to ubiquinone deficiency
Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, G2P
coenzyme Q10 deficiency
Inheritance: AR Classification: DEFINITIVE Submitted by: Illumina

COQ8A links:

ENSG00000288674 (HGNC:):

ENSG00000288674 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.15300548).

BS2

High Homozygotes in GnomAdExome4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COQ8A	NM_020247.5 link	c.1057C>T	p.Arg353Cys	missense_variant	Exon 8 of 15	ENST00000366777.4	NP_064632.2	Q8NI60-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
COQ8A	ENST00000366777.4 link	c.1057C>T	p.Arg353Cys	missense_variant	Exon 8 of 15	1	NM_020247.5	ENSP00000355739.3	Q8NI60-1
ENSG00000288674	ENST00000366779.6 link	n.*5784C>T		non_coding_transcript_exon_variant	Exon 25 of 32	2		ENSP00000355741.2
ENSG00000288674	ENST00000366779.6 link	n.*5784C>T		3_prime_UTR_variant	Exon 25 of 32	2		ENSP00000355741.2

Frequencies

GnomAD3 genomes

AF:

0.000158

AC:

AN:

152232

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000482

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00232

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000147

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000224

AC:

AN:

209744

AF XY:

0.000246

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00183

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000153

Gnomad OTH exome

AF:

0.000189

GnomAD4 exome

AF:

0.000156

AC:

225

AN:

1439512

Hom.:

Cov.:

AF XY:

0.000167

AC XY:

119

AN XY:

714454

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

32930

American (AMR)

AF:

0.00

AC:

AN:

41698

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25782

East Asian (EAS)

AF:

0.000836

AC:

AN:

38298

South Asian (SAS)

AF:

0.000156

AC:

AN:

83530

European-Finnish (FIN)

AF:

0.0000198

AC:

AN:

50498

Middle Eastern (MID)

AF:

0.000197

AC:

AN:

5064

European-Non Finnish (NFE)

AF:

0.000147

AC:

162

AN:

1102236

Other (OTH)

AF:

0.000269

AC:

AN:

59476

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.480

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000158

AC:

AN:

152350

Hom.:

Cov.:

AF XY:

0.000215

AC XY:

AN XY:

74492

show subpopulations

African (AFR)

AF:

0.0000481

AC:

AN:

41588

American (AMR)

AF:

0.00

AC:

AN:

15306

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00232

AC:

AN:

5164

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10626

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000147

AC:

AN:

68046

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000950

Hom.:

Bravo

AF:

0.000159

ExAC

AF:

0.000141

AC:

Asia WGS

AF:

0.00173

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:3

Feb 09, 2024

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Has not been previously published as pathogenic or benign to our knowledge; In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 32958805) -

May 02, 2023

Athena Diagnostics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Available data are insufficient to determine the clinical significance of the variant at this time. The frequency of this variant in the general population is higher than would generally be expected for pathogenic variants in this gene (http://gnomad.broadinstitute.org). Computational tools disagree on the variant's effect on normal protein function. -

Nov 02, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 353 of the COQ8A protein (p.Arg353Cys). This variant is present in population databases (rs373083392, gnomAD 0.2%). This variant has not been reported in the literature in individuals affected with COQ8A-related conditions. ClinVar contains an entry for this variant (Variation ID: 446787). 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. 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. -

not specified

Uncertain:1

Nov 07, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: COQ8A c.1057C>T (p.Arg353Cys) results in a non-conservative amino acid change located in the ADCK3-like domain (IPR034646) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00022 in 209744 control chromosomes (gnomAD). c.1057C>T has been reported in the literature in at least an individual affected with COQ8A-related conditions (Papuc_2019). This report however, does not provide unequivocal conclusions about association of the variant with Autosomal Recessive Ataxia Due To Ubiquinone Deficiency. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 30552426, 23773965). ClinVar contains an entry for this variant (Variation ID: 446787). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.16

BayesDel_addAF

Benign

-0.24

BayesDel_noAF

Benign

-0.14

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.63

D;.;D

Eigen

Uncertain

0.63

Eigen_PC

Uncertain

0.49

FATHMM_MKL

Uncertain

0.86

LIST_S2

Uncertain

0.97

.;D;D

M_CAP

Uncertain

0.093

MetaRNN

Benign

0.15

T;T;T

MetaSVM

Uncertain

0.10

PhyloP100

2.1

PrimateAI

Uncertain

0.57

PROVEAN

Pathogenic

-5.7

D;D;D

REVEL

Uncertain

0.33

Sift

Uncertain

0.0010

D;D;D

Sift4G

Uncertain

0.0020

D;D;D

Polyphen

1.0

D;.;D

Vest4

0.61

MutPred

0.65

Loss of MoRF binding (P = 0.0034);.;Loss of MoRF binding (P = 0.0034);

MVP

0.69

MPC

0.32

ClinPred

0.30

GERP RS

4.7

RBP_binding_hub_radar

1.0

RBP_regulation_power_radar

3.8

Varity_R

0.81

gMVP

0.69

Mutation Taster

=38/62

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over