NM_000766.5:c.74G>C

Variant names:

• chr19-41088545-G-C
• NM_000766.5:c.74G>C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_000766.5(CYP2A13):​c.74G>C​(p.Arg25Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,694 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 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. R25Q) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: CYP2A13 NM_000766.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.728

Genes affected

CYP2A13 (HGNC:2608): (cytochrome P450 family 2 subfamily A member 13) This gene 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. Although its endogenous substrate has not been determined, it is known to metabolize 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone, a major nitrosamine specific to tobacco. This gene is part of a large cluster of cytochrome P450 genes from the CYP2A, CYP2B and CYP2F subfamilies on chromosome 19q. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.28386554).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CYP2A13	NM_000766.5	c.74G>C	p.Arg25Pro	missense_variant	Exon 1 of 9	ENST00000330436.4	NP_000757.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CYP2A13	ENST00000330436.4	c.74G>C	p.Arg25Pro	missense_variant	Exon 1 of 9	1	NM_000766.5	ENSP00000332679.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461694 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 727166

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000331

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.33
BayesDel_addAF	Benign	-0.043	T
BayesDel_noAF	Benign	-0.30
CADD	Benign	11
DANN	Benign	0.97
DEOGEN2	Benign	0.21	T
Eigen	Benign	-0.58
Eigen_PC	Benign	-0.71
FATHMM_MKL	Benign	0.14	N
LIST_S2	Benign	0.43	T
M_CAP	Benign	0.033	D
MetaRNN	Benign	0.28	T
MetaSVM	Benign	-0.75	T
MutationAssessor	Benign	1.8	L
PrimateAI	Benign	0.34	T
PROVEAN	Uncertain	-2.7	D
REVEL	Uncertain	0.37
Sift	Uncertain	0.0050	D
Sift4G	Uncertain	0.035	D
Polyphen		0.74	P
Vest4		0.40
MutPred		0.54		Loss of MoRF binding (P = 0.0021);
MVP		0.73
MPC		0.33
ClinPred		0.95	D
GERP RS		1.1
Varity_R		0.47
gMVP		0.50

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr19-41594450;