19-40850474-A-G

Variant names:

• chr19-40850474-A-G
• rs28399433
• ENST00000601627.1:n.118-41517A>G

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The ENST00000601627.1(ENSG00000268797):​n.118-41517A>G variant causes a intron change. The variant allele was found at a frequency of 0.00000498 in 1,406,036 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 30)
  • Exomes 𝑓: 0.0000050 (1 hom.)
• Consequence: ENSG00000268797 ENST00000601627.1 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.68
• Publications: 157 publications found

Genes affected

ENSG00000268797 (HGNC:):

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)

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.52).

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000601627.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CYP2A6	NM_000762.6	MANE Select	c.-48T>C		upstream_gene	N/A	NP_000753.3

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ENSG00000268797	ENST00000601627.1	TSL:3	n.118-41517A>G		intron	N/A	ENSP00000469533.1
	CYP2A6	ENST00000301141.10	TSL:1 MANE Select	c.-48T>C		upstream_gene	N/A	ENSP00000301141.4
	CYP2A6	ENST00000596719.5	TSL:1	n.-34T>C		upstream_gene	N/A

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD2 exomes AF: 0.00000443 AC: 1 AN: 225772 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000318

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: 0.00

GnomAD4 exome AF: 0.00000498 AC: 7 AN: 1406036 Hom.: 1 Cov.: 29 AF XY: 0.00000287 AC XY: 2 AN XY: 696474

African (AFR) AF: 0.00 AC: 0 AN: 32290

American (AMR) AF: 0.0000241 AC: 1 AN: 41428

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 23800

East Asian (EAS) AF: 0.0000267 AC: 1 AN: 37388

South Asian (SAS) AF: 0.00 AC: 0 AN: 80452

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51806

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5546

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1075376

Other (OTH) AF: 0.0000863 AC: 5 AN: 57950

GnomAD4 genome Cov.: 30

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.52
CADD	Benign	20
DANN	Benign	0.63
PhyloP100		4.7
PromoterAI		0.066	Neutral

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

Other links and lift over

dbSNP: rs28399433; hg19: chr19-41356379;