Genetic Variant NM_000762.6:c.607C>T (chr19-40848266-G-A) – ACMG Classification: Benign (-8 pts)

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BP4_StrongBS2

The NM_000762.6(CYP2A6):c.607C>T(p.Arg203Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000688 in 1,611,504 control chromosomes in the GnomAD database, including 35 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/19 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.0036 ( 16 hom., cov: 31)

Exomes 𝑓: 0.00038 ( 19 hom. )

Consequence

CYP2A6
NM_000762.6 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -1.20

Publications

20 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:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -8 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0065482557).

BS2

High Homozygotes in GnomAd4 at 16 Unknown gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CYP2A6	NM_000762.6 link	c.607C>T	p.Arg203Cys	missense_variant	Exon 4 of 9	ENST00000301141.10	NP_000753.3	P11509

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CYP2A6	ENST00000301141.10 link	c.607C>T	p.Arg203Cys	missense_variant	Exon 4 of 9	1	NM_000762.6	ENSP00000301141.4		P11509
ENSG00000268797	ENST00000601627.1 link	n.118-43725G>A		intron_variant	Intron 1 of 3	3		ENSP00000469533.1		M0QY20

Frequencies

GnomAD3 genomes

AF:

0.00364

AC:

550

AN:

151100

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0127

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00138

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:

0.0000295

Gnomad OTH

AF:

0.00288

GnomAD2 exomes

AF:

0.00110

AC:

275

AN:

251130

AF XY:

0.000833

show subpopulations

Gnomad AFR exome

AF:

0.0145

Gnomad AMR exome

AF:

0.000955

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000176

Gnomad OTH exome

AF:

0.000652

GnomAD4 exome

AF:

0.000382

AC:

558

AN:

1460292

Hom.:

Cov.:

AF XY:

0.000319

AC XY:

232

AN XY:

726454

show subpopulations

African (AFR)

AF:

0.0141

AC:

473

AN:

33452

American (AMR)

AF:

0.000895

AC:

AN:

44716

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26132

East Asian (EAS)

AF:

0.0000520

AC:

AN:

38432

South Asian (SAS)

AF:

0.0000232

AC:

AN:

86152

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53390

Middle Eastern (MID)

AF:

0.000173

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.00000360

AC:

AN:

1111966

Other (OTH)

AF:

0.000597

AC:

AN:

60286

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.468

Heterozygous variant carriers

127

159

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00364

AC:

550

AN:

151212

Hom.:

Cov.:

AF XY:

0.00343

AC XY:

253

AN XY:

73862

show subpopulations

African (AFR)

AF:

0.0127

AC:

521

AN:

41082

American (AMR)

AF:

0.00138

AC:

AN:

15244

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

4904

South Asian (SAS)

AF:

0.00

AC:

AN:

4760

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10550

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000295

AC:

AN:

67898

Other (OTH)

AF:

0.00286

AC:

AN:

2098

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.497

Heterozygous variant carriers

122

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000453

Hom.:

Bravo

AF:

0.00424

ESP6500AA

AF:

0.0159

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.00137

AC:

166

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.23

BayesDel_addAF

Benign

-0.54

BayesDel_noAF

Benign

-0.53

CADD

Benign

(source)

DANN

Benign

0.81

Eigen

Benign

-1.7

Eigen_PC

Benign

-1.8

FATHMM_MKL

Benign

0.052

LIST_S2

Benign

0.097

MetaRNN

Benign

0.0065

MetaSVM

Benign

-0.94

PhyloP100

-1.2

PrimateAI

Benign

0.39

PROVEAN

Uncertain

-2.6

REVEL

Benign

0.14

Sift

Benign

0.058

Sift4G

Benign

0.065

Vest4

0.34

MVP

0.50

MPC

0.12

ClinPred

0.0076

GERP RS

-1.7

gMVP

0.40

Mutation Taster

=98/2

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over