chr19-40991670-T-A

Variant names:

• chr19-40991670-T-A
• rs28739581
• NM_000767.5:c.171+194T>A

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_000767.5(CYP2B6):​c.171+194T>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.088 in 151,998 control chromosomes in the GnomAD database, including 1,976 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: 𝑓 0.088 (1976 hom., cov: 31)
• Consequence: CYP2B6 NM_000767.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.308
• Publications: 3 publications found

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]

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.3 is higher than 0.05.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000767.5. 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
	CYP2B6	NM_000767.5	MANE Select	c.171+194T>A		intron	N/A	NP_000758.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CYP2B6	ENST00000324071.10	TSL:1 MANE Select	c.171+194T>A		intron	N/A	ENSP00000324648.2
	CYP2B6	ENST00000598834.2	TSL:5	n.72+194T>A		intron	N/A	ENSP00000496294.1

Frequencies

GnomAD3 genomes AF: 0.0877 AC: 13324 AN: 151878 Hom.: 1961 Cov.: 31

Gnomad AFR AF: 0.304

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0389

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00166

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.0159

Gnomad NFE AF: 0.00118

Gnomad OTH AF: 0.0628

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.0880 AC: 13383 AN: 151998 Hom.: 1976 Cov.: 31 AF XY: 0.0860 AC XY: 6393 AN XY: 74338

African (AFR) AF: 0.304 AC: 12569 AN: 41316

American (AMR) AF: 0.0387 AC: 592 AN: 15278

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5178

South Asian (SAS) AF: 0.00145 AC: 7 AN: 4822

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10612

Middle Eastern (MID) AF: 0.0137 AC: 4 AN: 292

European-Non Finnish (NFE) AF: 0.00118 AC: 80 AN: 68010

Other (OTH) AF: 0.0621 AC: 131 AN: 2108

Alfa AF: 0.0519 Hom.: 137

Bravo AF: 0.101

Asia WGS AF: 0.0200 AC: 71 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	3.3
DANN	Benign	0.67
PhyloP100		0.31
PromoterAI		0.00070	Neutral
Mutation Taster		=100/0	polymorphism (auto)

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: rs28739581; hg19: chr19-41497575;