Genetic Variant COQ2:p.Ala252Gly (chr4-83269867-G-C) – ACMG Classification: Likely_pathogenic (8 pts)

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM1PM2PP3_Strong

The NM_001358921.2(COQ2):c.755C>G(p.Ala252Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A252V) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

COQ2
NM_001358921.2 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 9.96

Publications

9 publications found

Variant links:

Genes affected

COQ2 (HGNC:25223): (coenzyme Q2, polyprenyltransferase) This gene encodes an enzyme that functions in the final steps in the biosynthesis of CoQ (ubiquinone), a redox carrier in the mitochondrial respiratory chain and a lipid-soluble antioxidant. This enzyme, which is part of the coenzyme Q10 pathway, catalyzes the prenylation of parahydroxybenzoate with an all-trans polyprenyl group. Mutations in this gene cause coenzyme Q10 deficiency, a mitochondrial encephalomyopathy, and also COQ2 nephropathy, an inherited form of mitochondriopathy with primary renal involvement. [provided by RefSeq, Oct 2009]

COQ2 Gene-Disease associations (from GenCC):

coenzyme Q10 deficiency, primary, 1
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
mitochondrial disease
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
multiple system atrophy
Inheritance: AR Classification: MODERATE Submitted by: Genomics England PanelApp
Leigh syndrome with nephrotic syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

COQ2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 6 uncertain in NM_001358921.2

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.945

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COQ2	NM_001358921.2 link	c.755C>G	p.Ala252Gly	missense_variant	Exon 5 of 7	ENST00000647002.2	NP_001345850.1
COQ2	NM_015697.9 link	c.905C>G	p.Ala302Gly	missense_variant	Exon 5 of 7		NP_056512.5	Q96H96-4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COQ2	ENST00000647002.2 link	c.755C>G	p.Ala252Gly	missense_variant	Exon 5 of 7		NM_001358921.2	ENSP00000495761.2		Q96H96-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000432

AC:

AN:

231686

AF XY:

0.00000792

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000615

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AC0

AF:

0.00

AC:

AN:

1435594

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

713798

African (AFR)

AF:

0.00

AC:

AN:

32114

American (AMR)

AF:

0.00

AC:

AN:

40850

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25780

East Asian (EAS)

AF:

0.00

AC:

AN:

38172

South Asian (SAS)

AF:

0.00

AC:

AN:

81108

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53282

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5714

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1099146

Other (OTH)

AF:

0.00

AC:

AN:

59428

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.00000756

ExAC

AF:

0.00000828

AC:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.33

BayesDel_addAF

Pathogenic

0.43

BayesDel_noAF

Pathogenic

0.38

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.79

.;.;D

Eigen

Uncertain

0.62

Eigen_PC

Uncertain

0.66

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.99

D;.;D

M_CAP

Pathogenic

0.30

MetaRNN

Pathogenic

0.95

D;D;D

MetaSVM

Pathogenic

0.83

PhyloP100

PrimateAI

Uncertain

0.63

PROVEAN

Uncertain

-3.1

.;D;D

REVEL

Pathogenic

0.67

Sift

Uncertain

0.021

.;D;D

Sift4G

Uncertain

0.032

.;D;D

Polyphen

0.54

.;.;P

Vest4

0.85, 0.84

MutPred

0.86

Gain of glycosylation at Y251 (P = 0.0239);.;Gain of glycosylation at Y251 (P = 0.0239);

MVP

0.96

MPC

0.34

ClinPred

0.84

GERP RS

6.2

gMVP

0.75

Mutation Taster

=9/91

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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over