Genetic Variant CYP2A6:p.Ser426Arg (chr19-40844658-T-G) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_000762.6(CYP2A6):c.1276A>C(p.Ser426Arg) variant causes a missense change. The variant allele was found at a frequency of 0.00000274 in 1,460,214 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/20 in silico tools predict a benign 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. S426G) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

CYP2A6
NM_000762.6 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 3.67

Publications

0 publications found

Variant links:

Genes affected

CYP2A6 (HGNC:2610): (cytochrome P450 family 2 subfamily A member 6) This gene, CYP2A6, 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 hydroxylate coumarin, and also metabolizes nicotine, aflatoxin B1, nitrosamines, and some pharmaceuticals. Individuals with certain allelic variants are said to have a poor metabolizer phenotype, meaning they do not efficiently metabolize coumarin or nicotine. This gene is part of a large cluster of cytochrome P450 genes from the CYP2A, CYP2B and CYP2F subfamilies on chromosome 19q. The gene was formerly referred to as CYP2A3; however, it has been renamed CYP2A6. [provided by RefSeq, Jul 2008]

CYP2A6 Gene-Disease associations (from GenCC):

coumarin resistance
Inheritance: Unknown Classification: NO_KNOWN Submitted by: Labcorp Genetics (formerly Invitae)
nicotine dependence
Inheritance: Unknown Classification: NO_KNOWN Submitted by: Labcorp Genetics (formerly Invitae)

CYP2A6 links:

ENSG00000268797 (HGNC:):

ENSG00000268797 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.22287735).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CYP2A6	NM_000762.6 link	c.1276A>C	p.Ser426Arg	missense_variant	Exon 8 of 9	ENST00000301141.10	NP_000753.3	P11509

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
CYP2A6	ENST00000301141.10 link	c.1276A>C	p.Ser426Arg	missense_variant	Exon 8 of 9	1	NM_000762.6	ENSP00000301141.4	P11509
ENSG00000268797	ENST00000601627.1 link	n.117+43243T>G		intron_variant	Intron 1 of 3	3		ENSP00000469533.1	M0QY20
CYP2A6	ENST00000599960.1 link	n.195A>C		non_coding_transcript_exon_variant	Exon 1 of 2	2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000274

AC:

AN:

1460214

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

726420

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33452

American (AMR)

AF:

0.0000447

AC:

AN:

44718

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

38432

South Asian (SAS)

AF:

0.00

AC:

AN:

86150

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53364

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.00000180

AC:

AN:

1111928

Other (OTH)

AF:

0.00

AC:

AN:

60272

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.53

BayesDel_addAF

Benign

-0.086

BayesDel_noAF

Benign

-0.36

CADD

Uncertain

(source)

DANN

Uncertain

0.99

Eigen

Benign

-0.35

Eigen_PC

Benign

-0.24

FATHMM_MKL

Uncertain

0.94

LIST_S2

Benign

0.31

M_CAP

Benign

0.038

MetaRNN

Benign

0.22

MetaSVM

Benign

-0.81

PhyloP100

3.7

PrimateAI

Benign

0.46

PROVEAN

Uncertain

-2.7

REVEL

Benign

0.17

Sift

Uncertain

0.019

Sift4G

Uncertain

0.042

Vest4

0.12

MutPred

0.59

Gain of methylation at K425 (P = 0.0598);

MVP

0.77

MPC

0.14

ClinPred

0.95

GERP RS

3.2

gMVP

0.51

Mutation Taster

=91/9

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