2-38075070-G-C

Position:

chr2-38075070-G-C

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_000104.4(CYP1B1):c.319C>G(p.Leu107Val) variant causes a missense change. The variant allele was found at a frequency of 0.0001 in 1,583,766 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00012 ( 0 hom., cov: 34)

Exomes 𝑓: 0.000099 ( 0 hom. )

Consequence

CYP1B1
NM_000104.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1

Conservation

PhyloP100: 3.73

Variant links:

Genes affected

CYP1B1 (HGNC:2597): (cytochrome P450 family 1 subfamily B member 1) 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. The enzyme encoded by this gene localizes to the endoplasmic reticulum and metabolizes procarcinogens such as polycyclic aromatic hydrocarbons and 17beta-estradiol. Mutations in this gene have been associated with primary congenital glaucoma; therefore it is thought that the enzyme also metabolizes a signaling molecule involved in eye development, possibly a steroid. [provided by RefSeq, Jul 2008]

CYP1B1 links:

CYP1B1-AS1 (HGNC:28543): (CYP1B1 antisense RNA 1)

CYP1B1-AS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.012887776).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CYP1B1	NM_000104.4 linkuse as main transcript	c.319C>G	p.Leu107Val	missense_variant	2/3	ENST00000610745.5	NP_000095.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CYP1B1	ENST00000610745.5 linkuse as main transcript	c.319C>G	p.Leu107Val	missense_variant	2/3	1	NM_000104.4	ENSP00000478561	P1

Frequencies

GnomAD3 genomes

AF:

0.000118

AC:

AN:

152248

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00308

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000341

AC:

AN:

196756

Hom.:

AF XY:

0.000311

AC XY:

AN XY:

109400

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00424

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000114

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000985

AC:

141

AN:

1431400

Hom.:

Cov.:

AF XY:

0.0000985

AC XY:

AN XY:

710964

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00343

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

9.05e-7

Gnomad4 OTH exome

AF:

0.000117

GnomAD4 genome

AF:

0.000118

AC:

AN:

152366

Hom.:

Cov.:

AF XY:

0.000148

AC XY:

AN XY:

74510

show subpopulations

Gnomad4 AFR

AF:

0.0000240

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00309

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.000196

ExAC

AF:

0.000392

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

May 13, 2022

Variant summary: CYP1B1 c.319C>G (p.Leu107Val) results in a conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00034 in 196756 control chromosomes, predominantly at a frequency of 0.0042 within the East Asian subpopulation in the gnomAD database. This frequency similar to the expected for a pathogenic variant in CYP1B1 causing Primary Congenital Glaucoma (0.00034 vs 0.0043), suggesting the variant might be a polymorphism found in the East Asian population. c.319C>G has been reported in the literature in individuals affected with Primary Congenital Glaucoma without strong evidence for causality, as well as in controls and unaffected individuals (eg. Chen_2008, Kim_2011, Chen_2014, Chen_2015, Gong_2015, Qiao_2021). These reports do not provide unequivocal conclusions about association of the variant with Primary Congenital Glaucoma. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Four clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. Three submitters classified the variant as VUS while one classified as benign. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Glaucoma 3A

Uncertain:1

Uncertain significance, criteria provided, single submitter

reference population

Soonchunhyang University Bucheon Hospital, Soonchunhyang University Medical Center

Mar 18, 2016

- -

Irido-corneo-trabecular dysgenesis

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Congenital glaucoma

Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 31, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.39

BayesDel_addAF

Benign

0.0091

BayesDel_noAF

Pathogenic

0.24

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.59

D;D;.

Eigen

Uncertain

0.54

Eigen_PC

Uncertain

0.36

FATHMM_MKL

Uncertain

0.93

LIST_S2

Uncertain

0.91

.;D;D

M_CAP

Pathogenic

0.78

MetaRNN

Benign

0.013

T;T;T

MetaSVM

Uncertain

0.39

MutationAssessor

Pathogenic

3.9

H;H;.

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.51

Sift4G

Pathogenic

0.0

D;D;.

Vest4

0.87

MVP

0.36

ClinPred

0.38

GERP RS

2.7

Varity_R

0.54

gMVP

0.82

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over