Genetic Variant CYP2B6:p.Gly110Ala (chr19-41004158-G-C) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_000767.5(CYP2B6):c.329G>C(p.Gly110Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000116 in 858,816 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. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G110V) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 28)

Exomes 𝑓: 0.0000012 ( 0 hom. )

Consequence

CYP2B6
NM_000767.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 2.56

Publications

9 publications found

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 was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.868

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CYP2B6	NM_000767.5 link	c.329G>C	p.Gly110Ala	missense_variant	Exon 2 of 9	ENST00000324071.10	NP_000758.1	P20813-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
CYP2B6	ENST00000324071.10 link	c.329G>C	p.Gly110Ala	missense_variant	Exon 2 of 9	1	NM_000767.5	ENSP00000324648.2	P20813-1
CYP2B6	ENST00000593831.1 link	c.101G>C	p.Gly34Ala	missense_variant	Exon 1 of 5	2		ENSP00000470582.1	M0QZJ2
CYP2B6	ENST00000598834.2 link	n.230G>C		non_coding_transcript_exon_variant	Exon 2 of 10	5		ENSP00000496294.1	A0A2R8YFA4
CYP2B6	ENST00000594187.1 link	n.-221G>C		upstream_gene_variant		5

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000399

AC:

AN:

250694

AF XY:

0.00000737

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:

0.000164

GnomAD4 exome

AF:

0.00000116

AC:

AN:

858816

Hom.:

Cov.:

AF XY:

0.00000228

AC XY:

AN XY:

438768

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

19738

American (AMR)

AF:

0.00

AC:

AN:

36946

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

14892

East Asian (EAS)

AF:

0.00

AC:

AN:

15438

South Asian (SAS)

AF:

0.00

AC:

AN:

76320

European-Finnish (FIN)

AF:

0.00

AC:

AN:

32674

Middle Eastern (MID)

AF:

0.00

AC:

AN:

3766

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

626648

Other (OTH)

AF:

0.0000309

AC:

AN:

32394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000135

Hom.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.41

BayesDel_addAF

Benign

-0.041

BayesDel_noAF

Benign

-0.30

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.030

T;T;T

Eigen

Benign

0.10

Eigen_PC

Benign

-0.10

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.88

.;D;D

M_CAP

Benign

0.0078

MetaRNN

Pathogenic

0.87

D;D;D

MetaSVM

Benign

-0.48

MutationAssessor

Pathogenic

3.0

M;M;.

PhyloP100

2.6

PrimateAI

Uncertain

0.51

PROVEAN

Uncertain

-4.2

.;D;.

REVEL

Benign

0.13

Sift

Uncertain

0.0050

.;D;.

Sift4G

Uncertain

0.025

.;D;D

Polyphen

0.94

P;P;.

Vest4

0.45, 0.44

MutPred

0.75

Loss of methylation at R109 (P = 0.0885);Loss of methylation at R109 (P = 0.0885);.;

MVP

0.71

MPC

0.22

ClinPred

0.92

GERP RS

1.9

PromoterAI

-0.032

Neutral

(source)

Varity_R

0.71

gMVP

0.38

Mutation Taster

=69/31

polymorphism

(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