rs767298430

Variant names:

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 8P and 1B. PVS1BS1_Supporting

The ENST00000311469.9(COQ2):c.48dupC(p.Ala17ArgfsTer76) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000763 in 1,532,820 control chromosomes in the GnomAD database, including 1 homozygotes. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. T16T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000078 ( 1 hom. )

Consequence

COQ2
ENST00000311469.9 frameshift

Scores

Not classified

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3U:3B:1

Conservation

PhyloP100: -0.488

Publications

1 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 7 ACMG points.

PVS1

Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 36 pathogenic variants in the truncated region.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.0000657 (10/152230) while in subpopulation SAS AF = 0.00208 (10/4810). AF 95% confidence interval is 0.00113. There are 0 homozygotes in GnomAd4. There are 4 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COQ2	NM_015697.9 link	c.48dupC	p.Ala17ArgfsTer76	frameshift_variant	Exon 1 of 7		NP_056512.5	Q96H96-4
COQ2	NM_001358921.2 link	c.-103dupC		upstream_gene_variant		ENST00000647002.2	NP_001345850.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
COQ2	ENST00000311469.9 link	c.48dupC	p.Ala17ArgfsTer76	frameshift_variant	Exon 1 of 7	1		ENSP00000310873.4	Q96H96-4
COQ2	ENST00000647002.2 link	c.-103dupC		upstream_gene_variant			NM_001358921.2	ENSP00000495761.2	Q96H96-1
COQ2	ENST00000311461.7 link	c.-103dupC		upstream_gene_variant		5		ENSP00000311835.7	Q96H96-3E2QRG7
COQ2	ENST00000503391.5 link	n.-103dupC		upstream_gene_variant		2		ENSP00000426242.1	E7EPM7

Frequencies

GnomAD3 genomes

AF:

0.0000657

AC:

AN:

152114

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00208

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000173

AC:

AN:

138354

AF XY:

0.000240

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000775

AC:

107

AN:

1380590

Hom.:

Cov.:

AF XY:

0.000113

AC XY:

AN XY:

681674

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

30864

American (AMR)

AF:

0.00

AC:

AN:

35074

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25076

East Asian (EAS)

AF:

0.00

AC:

AN:

34900

South Asian (SAS)

AF:

0.00136

AC:

106

AN:

78212

European-Finnish (FIN)

AF:

0.00

AC:

AN:

34792

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5692

European-Non Finnish (NFE)

AF:

9.28e-7

AC:

AN:

1078138

Other (OTH)

AF:

0.00

AC:

AN:

57842

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.489

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:

0.0000657

AC:

AN:

152230

Hom.:

Cov.:

AF XY:

0.0000537

AC XY:

AN XY:

74430

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41542

American (AMR)

AF:

0.00

AC:

AN:

15310

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5170

South Asian (SAS)

AF:

0.00208

AC:

AN:

4810

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10606

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68006

Other (OTH)

AF:

0.00

AC:

AN:

2108

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.490

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:

0.00

Hom.:

Bravo

AF:

0.0000113

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:3Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Pathogenic:2Uncertain:1

Jul 14, 2015

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Sep 01, 2023

GeneDx

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Frameshift variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss of function is a known mechanism of disease; Has not been previously published as pathogenic or benign to our knowledge; This variant is associated with the following publications: (PMID: 29255295) -

Jul 12, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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. ClinVar contains an entry for this variant (Variation ID: 235473). This variant has not been reported in the literature in individuals affected with COQ2-related conditions. This variant is present in population databases (rs767298430, gnomAD 0.1%). This sequence change creates a premature translational stop signal (p.Ala17Argfs*76) in the COQ2 gene. However, it is currently unclear if variants that occur in this region of the gene cause disease. -

Focal segmental glomerulosclerosis

Pathogenic:1

Aug 04, 2021

Genome Diagnostics Laboratory, The Hospital for Sick Children

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Coenzyme Q10 deficiency, primary, 1;C3714927:Multiple system atrophy 1, susceptibility to

Uncertain:1

Jun 19, 2024

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Coenzyme Q10 deficiency, primary, 1

Uncertain:1

Nov 22, 2023

Revvity Omics, Revvity

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Inborn genetic diseases

Benign:1

Nov 08, 2022

Ambry Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

-0.49

Mutation Taster

=123/77

disease causing (ClinVar)

(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