chr7-99768448-G-C

Position:

• chr7-99768448-G-C

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_Moderate BS2

The NM_017460.6(CYP3A4):​c.576C>G​(p.Asn192Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000558 in 1,613,946 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: CYP3A4 NM_017460.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.254

Genes affected

CYP3A4 (HGNC:2637): (cytochrome P450 family 3 subfamily A member 4) This gene encodes a member of the cytochrome P450 superfamily of enzymes. The cytochrome P450 proteins are monooxygenases that 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 glucocorticoids and some pharmacological agents. This enzyme is involved in the metabolism of approximately half the drugs in use today, including acetaminophen, codeine, cyclosporin A, diazepam, erythromycin, and chloroquine. The enzyme also metabolizes some steroids and carcinogens. This gene is part of a cluster of cytochrome P450 genes on chromosome 7q21.1. Previously another CYP3A gene, CYP3A3, was thought to exist; however, it is now thought that this sequence represents a transcript variant of CYP3A4. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Aug 2020]

ACMG classification

Verdict is Likely_benign. Variant got -6 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.14752537).
• BS2: High AC in GnomAdExome4 at 7 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CYP3A4	NM_017460.6	c.576C>G	p.Asn192Lys	missense_variant	7/13	ENST00000651514.1	NP_059488.2
CYP3A4	NM_001202855.3	c.576C>G	p.Asn192Lys	missense_variant	7/13		NP_001189784.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CYP3A4	ENST00000651514.1	c.576C>G	p.Asn192Lys	missense_variant	7/13		NM_017460.6	ENSP00000498939.1
CYP3A4	ENST00000336411.7	c.576C>G	p.Asn192Lys	missense_variant	7/14	1		ENSP00000337915.3
CYP3A4	ENST00000652018.1	c.429C>G	p.Asn143Lys	missense_variant	5/11			ENSP00000498733.1
CYP3A4	ENST00000354593.6	c.126C>G	p.Asn42Lys	missense_variant	2/8	5		ENSP00000346607.2

Frequencies

GnomAD3 genomes AF: 0.0000131 AC: 2 AN: 152180 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

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: 0.0000294

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.00000479 AC: 7 AN: 1461766 Hom.: 0 Cov.: 32 AF XY: 0.00000413 AC XY: 3 AN XY: 727196

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: 0.00000630

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0000131 AC: 2 AN: 152180 Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2 AN XY: 74346

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000294

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000108 Hom.: 0

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 18, 2021

The c.576C>G (p.N192K) alteration is located in exon 7 (coding exon 7) of the CYP3A4 gene. This alteration results from a C to G substitution at nucleotide position 576, causing the asparagine (N) at amino acid position 192 to be replaced by a lysine (K). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.28
BayesDel_addAF	Benign	-0.26	T
BayesDel_noAF	Benign	-0.61
CADD	Benign	2.7
DANN	Benign	0.97
DEOGEN2	Benign	0.076	T;T
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.18	N
LIST_S2	Uncertain	0.87	D;D
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.15	T;T
MetaSVM	Benign	-0.95	T
MutationAssessor	Benign	1.4	.;L
MutationTaster	Benign	1.0	N;N
PrimateAI	Uncertain	0.48	T
PROVEAN	Uncertain	-3.9	D;D
REVEL	Benign	0.12
Sift	Uncertain	0.013	D;D
Sift4G	Benign	0.20	T;T
Polyphen		0.25	B;B
Vest4		0.19
MutPred		0.52		.;Gain of ubiquitination at N192 (P = 0.0138);
MVP		0.46
MPC		0.38
ClinPred		0.87	D
GERP RS		-4.2
Varity_R		0.67

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

LitVar

Other links and lift over

dbSNP: rs906783396; hg19: chr7-99366071;