Genetic Variant CYP2B6:p.Gly14Glu (chr19-40991346-G-A) – ACMG Classification: Uncertain_significance (3 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP3

The NM_000767.5(CYP2B6):c.41G>A(p.Gly14Glu) variant causes a missense change. The variant allele was found at a frequency of 0.00000658 in 152,058 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 31)

Consequence

CYP2B6
NM_000767.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.24

Variant links:

Genes affected

CYP2B6 (HGNC:2615): (cytochrome P450 family 2 subfamily B member 6) This gene, CYP2B6, 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 some xenobiotics, such as the anti-cancer drugs cyclophosphamide and ifosphamide. Transcript variants for this gene have been described; however, it has not been resolved whether these transcripts are in fact produced by this gene or by a closely related pseudogene, CYP2B7. Both the gene and the pseudogene are located in the middle of a CYP2A pseudogene found in a large cluster of cytochrome P450 genes from the CYP2A, CYP2B and CYP2F subfamilies on chromosome 19q. [provided by RefSeq, Jul 2008]

CYP2B6 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.809

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CYP2B6	NM_000767.5 link	c.41G>A	p.Gly14Glu	missense_variant	Exon 1 of 9	ENST00000324071.10	NP_000758.1	P20813-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CYP2B6	ENST00000324071.10 link	c.41G>A	p.Gly14Glu	missense_variant	Exon 1 of 9	1	NM_000767.5	ENSP00000324648.2		P20813-1
CYP2B6	ENST00000598834.2 link	n.-59G>A		upstream_gene_variant		5		ENSP00000496294.1		A0A2R8YFA4

Frequencies

GnomAD3 genomes

AF:

0.00000658

AC:

AN:

152058

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

Cov.:

GnomAD4 genome

AF:

0.00000658

AC:

AN:

152058

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74264

show subpopulations

Gnomad4 AFR

AF:

0.0000242

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Feb 12, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.41G>A (p.G14E) alteration is located in exon 1 (coding exon 1) of the CYP2B6 gene. This alteration results from a G to A substitution at nucleotide position 41, causing the glycine (G) at amino acid position 14 to be replaced by a glutamic acid (E). 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

Pathogenic

0.64

BayesDel_addAF

Uncertain

0.060

BayesDel_noAF

Benign

-0.15

CADD

Benign

DANN

Benign

0.82

DEOGEN2

Benign

0.044

T;T

Eigen

Benign

-0.063

Eigen_PC

Benign

-0.21

FATHMM_MKL

Benign

0.51

LIST_S2

Benign

0.34

.;T

M_CAP

Benign

0.0049

MetaRNN

Pathogenic

0.81

D;D

MetaSVM

Benign

-0.40

MutationAssessor

Benign

0.81

L;L

PrimateAI

Uncertain

0.56

PROVEAN

Uncertain

-3.7

.;D

REVEL

Uncertain

0.47

Sift

Benign

0.11

.;T

Sift4G

Benign

0.20

.;T

Polyphen

1.0

D;D

Vest4

0.54

MutPred

0.66

Gain of relative solvent accessibility (P = 0.09);Gain of relative solvent accessibility (P = 0.09);

MVP

0.82

MPC

0.083

ClinPred

0.73

GERP RS

3.1

Varity_R

0.15

gMVP

0.59

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over