4-83264275-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_001358921.2(COQ2):​c.1040T>C​(p.Ile347Thr) 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. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Consequence

COQ2
NM_001358921.2 missense

Scores

8
8
1

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 8.94
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]

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2
Very rare variant in population databases, with high coverage;
PP3
MetaRNN computational evidence supports a deleterious effect, 0.883

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect Exon rank MANE Protein UniProt
COQ2NM_001358921.2 linkc.1040T>C p.Ile347Thr missense_variant Exon 7 of 7 ENST00000647002.2 NP_001345850.1
COQ2NM_015697.9 linkc.1190T>C p.Ile397Thr missense_variant Exon 7 of 7 NP_056512.5 Q96H96-4

Ensembl

Gene Transcript HGVSc HGVSp Effect Exon rank TSL MANE Protein Appris UniProt
COQ2ENST00000647002.2 linkc.1040T>C p.Ile347Thr missense_variant Exon 7 of 7 NM_001358921.2 ENSP00000495761.2 Q96H96-1

Frequencies

GnomAD3 genomes
Cov.:
32
GnomAD4 exome
Cov.:
30
GnomAD4 genome
Cov.:
32

ClinVar

Significance: Uncertain significance
Submissions summary: Uncertain:1
Revision: criteria provided, single submitter
LINK: link

Submissions by phenotype

Inborn genetic diseases Uncertain:1
Mar 15, 2024
Ambry Genetics
Significance: Uncertain significance
Review Status: criteria provided, single submitter
Collection Method: clinical testing

The c.1190T>C (p.I397T) alteration is located in exon 7 (coding exon 7) of the COQ2 gene. This alteration results from a T to C substitution at nucleotide position 1190, causing the isoleucine (I) at amino acid position 397 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
AlphaMissense
Uncertain
0.50
BayesDel_addAF
Pathogenic
0.43
D
BayesDel_noAF
Pathogenic
0.38
CADD
Uncertain
24
DANN
Uncertain
1.0
Eigen
Pathogenic
0.83
Eigen_PC
Pathogenic
0.75
FATHMM_MKL
Pathogenic
0.99
D
LIST_S2
Uncertain
0.97
D;.
M_CAP
Uncertain
0.25
D
MetaRNN
Pathogenic
0.88
D;D
MetaSVM
Uncertain
0.64
D
PrimateAI
Uncertain
0.73
T
PROVEAN
Pathogenic
-4.4
.;D
REVEL
Pathogenic
0.76
Sift
Uncertain
0.0010
.;D
Sift4G
Uncertain
0.0020
.;D
Vest4
0.81
MutPred
0.61
Gain of catalytic residue at I347 (P = 0.0046);.;
MVP
0.86
MPC
0.74
ClinPred
1.0
D
GERP RS
6.2
gMVP
0.67

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: chr4-84185428; API