chr19-41004015-T-A

Variant names:

• chr19-41004015-T-A
• rs281864907
• NM_000767.5:c.186T>A

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_000767.5(CYP2B6):​c.186T>A​(p.Tyr62*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as drug response (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 31)
• Consequence: CYP2B6 NM_000767.5 stop_gained
• Clinical Significance: drug response no assertion criteria provided O:1
• Conservation: PhyloP100: -3.41
• Publications: 2 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: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CYP2B6	NM_000767.5	MANE Select	c.186T>A	p.Tyr62*	stop_gained	Exon 2 of 9	NP_000758.1	P20813-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CYP2B6	ENST00000324071.10	TSL:1 MANE Select	c.186T>A	p.Tyr62*	stop_gained	Exon 2 of 9	ENSP00000324648.2	P20813-1
	CYP2B6	ENST00000593831.1	TSL:2	c.-43T>A		5_prime_UTR	Exon 1 of 5	ENSP00000470582.1	M0QZJ2
	CYP2B6	ENST00000863358.1		c.172-2922T>A		intron	N/A	ENSP00000533417.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

ClinVar

ClinVar submissions

Significance: drug response

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
-	-	-	Efavirenz response (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Uncertain	0.16	D
BayesDel_noAF	Uncertain	-0.010
CADD	Uncertain	24
DANN	Uncertain	0.98
Eigen	Benign	-0.61
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.13	N
PhyloP100		-3.4
Vest4		0.69
GERP RS		-5.2
PromoterAI		-0.0051	Neutral
Mutation Taster		=56/144	disease causing (fs/PTC)

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

Other links and lift over

dbSNP: rs281864907; hg19: chr19-41509920;