chr2-38068125-T-C

Variant names:

• chr2-38068125-T-C
• rs746236755
• NM_000104.4:c.*2597A>G

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_000104.4(CYP1B1):​c.*2597A>G variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000386 in 207,004 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.

• Frequency:
  • Genomes: 𝑓 0.000046 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000018 (0 hom.)
• Consequence: CYP1B1 NM_000104.4 3_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:2
• Conservation: PhyloP100: -2.16
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• CYP1B1-related glaucoma with or without anterior segment dysgenesis

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen, Ambry Genetics
• glaucoma 3A

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine, G2P
• anterior segment dysgenesis 6

  Inheritance: AD Classification: STRONG Submitted by: PanelApp Australia
• congenital glaucoma

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Peters anomaly

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.92).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CYP1B1	NM_000104.4	c.*2597A>G		3_prime_UTR_variant	Exon 3 of 3	ENST00000610745.5	NP_000095.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CYP1B1	ENST00000610745.5	c.*2597A>G		3_prime_UTR_variant	Exon 3 of 3	1	NM_000104.4	ENSP00000478561.1
CYP1B1	ENST00000490576.2	c.*2597A>G		3_prime_UTR_variant	Exon 3 of 3	4		ENSP00000478839.2
CYP1B1	ENST00000714520.1	c.*2597A>G		3_prime_UTR_variant	Exon 3 of 3			ENSP00000519767.1
CYP1B1	ENST00000491456.1	n.185-1048A>G		intron_variant	Intron 2 of 2	3

Frequencies

GnomAD3 genomes AF: 0.0000460 AC: 7 AN: 152218 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000724

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: 0.0000588

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.0000183 AC: 1 AN: 54786 Hom.: 0 Cov.: 0 AF XY: 0.0000392 AC XY: 1 AN XY: 25526

African (AFR) AF: 0.00 AC: 0 AN: 2422

American (AMR) AF: 0.00 AC: 0 AN: 1540

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3428

East Asian (EAS) AF: 0.00 AC: 0 AN: 8424

South Asian (SAS) AF: 0.00 AC: 0 AN: 478

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 356

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 338

European-Non Finnish (NFE) AF: 0.0000302 AC: 1 AN: 33130

Other (OTH) AF: 0.00 AC: 0 AN: 4670

GnomAD4 genome AF: 0.0000460 AC: 7 AN: 152218 Hom.: 0 Cov.: 33 AF XY: 0.0000269 AC XY: 2 AN XY: 74368

African (AFR) AF: 0.0000724 AC: 3 AN: 41462

American (AMR) AF: 0.00 AC: 0 AN: 15280

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5202

South Asian (SAS) AF: 0.00 AC: 0 AN: 4830

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10620

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000588 AC: 4 AN: 68034

Other (OTH) AF: 0.00 AC: 0 AN: 2092

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000302

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, single submitter

Submissions by phenotype

Glaucoma 3A Uncertain:1

Mar 30, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Irido-corneo-trabecular dysgenesis Uncertain:1

Mar 30, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.92
CADD	Benign	0.099
DANN	Benign	0.54
PhyloP100		-2.2

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

Other links and lift over

dbSNP: rs746236755; hg19: chr2-38295268;