Genetic Variant CYP2C18:p.Asn202Ile (chr10-94695040-A-T) – ACMG Classification: Uncertain_significance (1 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2BP4

The NM_000772.3(CYP2C18):c.605A>T(p.Asn202Ile) 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 1,460,764 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts 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. N202S) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

CYP2C18
NM_000772.3 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.452

Publications

0 publications found

Variant links:

Genes affected

CYP2C18 (HGNC:2620): (cytochrome P450 family 2 subfamily C member 18) 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 but its specific substrate has not yet been determined. The gene is located within a cluster of cytochrome P450 genes on chromosome 10q24. An additional gene, CYP2C17, was once thought to exist; however, CYP2C17 is now considered an artefact based on a chimera of CYP2C18 and CYP2C19. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

CYP2C18 links:

ENSG00000276490 (HGNC:):

ENSG00000276490 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.41127256).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CYP2C18	NM_000772.3 link	c.605A>T	p.Asn202Ile	missense_variant	Exon 4 of 9	ENST00000285979.11	NP_000763.1	P33260-1Q7Z348
CYP2C18	NM_001128925.2 link	c.605A>T	p.Asn202Ile	missense_variant	Exon 4 of 8		NP_001122397.1	P33260-2Q7Z348

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
CYP2C18	ENST00000285979.11 link	c.605A>T	p.Asn202Ile	missense_variant	Exon 4 of 9	1	NM_000772.3	ENSP00000285979.6	P33260-1
CYP2C18	ENST00000339022.6 link	c.605A>T	p.Asn202Ile	missense_variant	Exon 4 of 8	1		ENSP00000341293.5	P33260-2
ENSG00000276490	ENST00000464755.1 link	n.245A>T		non_coding_transcript_exon_variant	Exon 2 of 14	2		ENSP00000483243.1	A0A087X0B3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1460764

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

726684

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33458

American (AMR)

AF:

0.00

AC:

AN:

44678

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26128

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39618

South Asian (SAS)

AF:

0.00

AC:

AN:

86154

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53400

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5210

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111798

Other (OTH)

AF:

0.00

AC:

AN:

60320

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.43

BayesDel_addAF

Benign

-0.048

BayesDel_noAF

Benign

-0.31

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.25

T;.

Eigen

Benign

-0.14

Eigen_PC

Benign

-0.30

FATHMM_MKL

Benign

0.36

LIST_S2

Uncertain

0.93

D;D

M_CAP

Uncertain

0.092

MetaRNN

Benign

0.41

T;T

MetaSVM

Uncertain

-0.27

MutationAssessor

Pathogenic

3.2

M;M

PhyloP100

0.45

PROVEAN

Pathogenic

-7.2

D;D

REVEL

Benign

0.22

Sift

Uncertain

0.011

D;T

Sift4G

Uncertain

0.038

D;D

Polyphen

0.57

P;.

Vest4

0.41

MutPred

0.56

Gain of catalytic residue at N202 (P = 0.0055);Gain of catalytic residue at N202 (P = 0.0055);

MVP

0.78

MPC

0.025

ClinPred

0.89

GERP RS

2.2

Varity_R

0.48

gMVP

0.25

Mutation Taster

=99/1

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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10-94695040-A-T

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over