10-95058391-G-C

Variant summary

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

The NM_000770.3(CYP2C8):c.763C>G(p.Leu255Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,236 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: CYP2C8 NM_000770.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.152

Genes affected

CYP2C8 (HGNC:2622): (cytochrome P450 family 2 subfamily C member 8) This gene encodes a member of the cytochrome P450 superfamily of enzymes. The cytochrome P450 proteins are monooxygenases which catalyze many reactions involved in drug metabolism and synthesis of cholesterol, steroids and other lipids. This protein localizes to the endoplasmic reticulum and its expression is induced by phenobarbital. The enzyme is known to metabolize many xenobiotics, including the anticonvulsive drug mephenytoin, benzo(a)pyrene, 7-ethyoxycoumarin, and the anti-cancer drug taxol. This gene is located within a cluster of cytochrome P450 genes on chromosome 10q24. Several transcript variants encoding a few different isoforms have been found for this gene. [provided by RefSeq, Nov 2010]

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
CYP2C8	NM_000770.3	c.763C>G	p.Leu255Val	missense_variant	5/9	ENST00000371270.6
CYP2C8	NM_001198853.1	c.553C>G	p.Leu185Val	missense_variant	5/9
CYP2C8	NM_001198855.1	c.553C>G	p.Leu185Val	missense_variant	6/10
CYP2C8	NM_001198854.1	c.457C>G	p.Leu153Val	missense_variant	4/8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CYP2C8	ENST00000371270.6	c.763C>G	p.Leu255Val	missense_variant	5/9	1	NM_000770.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461236 Hom.: 0 Cov.: 31 AF XY: 0.00000413 AC XY: 3 AN XY: 726924

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: 0.0000348

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 13, 2023

The c.763C>G (p.L255V) alteration is located in exon 5 (coding exon 5) of the CYP2C8 gene. This alteration results from a C to G substitution at nucleotide position 763, causing the leucine (L) at amino acid position 255 to be replaced by a valine (V). 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	Benign	0.17
BayesDel_addAF	Benign	-0.0028	T
BayesDel_noAF	Benign	-0.24
Cadd	Benign	12
Dann	Uncertain	0.98
Eigen	Benign	-0.77
Eigen_PC	Benign	-0.91
FATHMM_MKL	Benign	0.095	N
M_CAP	Benign	0.0076	T
MetaRNN	Uncertain	0.50	T;T;T;T;T
MetaSVM	Benign	-0.63	T
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.39	T
Sift4G	Uncertain	0.016	D;D;D;D;D
Polyphen		0.16	.;.;.;B;.
Vest4		0.19
MutPred		0.82		.;.;.;Loss of stability (P = 0.1031);.;
MVP		0.57
MPC		0.027
ClinPred		0.40	T
GERP RS		-0.51
Varity_R		0.51
gMVP		0.067

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: chr10-96818148;