rs121918168

Positions:

chr15-28014819-G-A

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM5PP3_StrongPP5_Very_Strong

The ENST00000354638.8(OCA2):c.1001C>T(p.Ala334Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000991 in 1,613,900 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A334T) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000010 ( 0 hom. )

Consequence

OCA2
ENST00000354638.8 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:5U:1

Conservation

PhyloP100: 8.43

Variant links:

Genes affected

OCA2 (HGNC:8101): (OCA2 melanosomal transmembrane protein) This gene encodes the human homolog of the mouse p (pink-eyed dilution) gene. The encoded protein is believed to be an integral membrane protein involved in small molecule transport, specifically tyrosine, which is a precursor to melanin synthesis. It is involved in mammalian pigmentation, where it may control skin color variation and act as a determinant of brown or blue eye color. Mutations in this gene result in type 2 oculocutaneous albinism. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2014]

OCA2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 14 ACMG points.

PM5

Other missense variant is known to change same aminoacid residue: Variant chr15-28014820-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 522150.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.982

PP5

Variant 15-28014819-G-A is Pathogenic according to our data. Variant chr15-28014819-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 958.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr15-28014819-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
OCA2	NM_000275.3 linkuse as main transcript	c.1001C>T	p.Ala334Val	missense_variant	9/24	ENST00000354638.8	NP_000266.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
OCA2	ENST00000354638.8 linkuse as main transcript	c.1001C>T	p.Ala334Val	missense_variant	9/24	1	NM_000275.3	ENSP00000346659	P1	Q04671-1
OCA2	ENST00000353809.9 linkuse as main transcript	c.1001C>T	p.Ala334Val	missense_variant	9/23	1		ENSP00000261276		Q04671-2

Frequencies

GnomAD3 genomes

AF:

0.00000658

AC:

AN:

152088

Hom.:

Cov.:

show subpopulations

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000797

AC:

AN:

251086

Hom.:

AF XY:

0.00000737

AC XY:

AN XY:

135748

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000880

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000103

AC:

AN:

1461812

Hom.:

Cov.:

AF XY:

0.00000825

AC XY:

AN XY:

727196

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000117

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000658

AC:

AN:

152088

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74264

show subpopulations

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:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000113

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:5Uncertain:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Tyrosinase-positive oculocutaneous albinism

Pathogenic:3

Pathogenic, no assertion criteria provided	literature only	OMIM	Jan 01, 2000	- -
Pathogenic, criteria provided, single submitter	clinical testing	Centre for Human Genetics, University of Kinshasa	Aug 06, 2022	This missense variant replaces a conserved Alanine residue with a Valine. This change is predicted damaging by the vast majority of prediction algorithms. This variant is very rare with no homozygous in gnomAD (AF: 0.00000797), was submited in ClinVar by multiple submitters without conflicting interpretation (VCV000000958.3), and is mentioned in at least two publications (PMID: 29345414‚ PMID: 10649493). We identified this variant in a heterozygous state in one patient with Tyrosinase-positive oculocutaneous albinism in the Democratic Republic of Congo (DRC). This patient was heterozygous for the classic 2.7 deletion in the OCA2 gene. Segregation analysis was not performed to unequivocally establish co-segregation with the 2.7 deletion. This variant was classified as pathogenic according to the ACMG guidelines. -
Likely pathogenic, criteria provided, single submitter	clinical testing	3billion	Mar 22, 2022	Same nucleotide change resulting in same amino acid change has been previously reported as pathogenic/likely pathogenic (ClinVar ID: VCV000000958, PMID:10649493). In silico tool predictions suggest damaging effect of the variant on gene or gene product(REVEL: 0.742>=0.6). A missense variant is a common mechanism. The variant is observed at an extremely low frequency in the gnomAD v2.1.1 dataset (total allele frequency: 0.0000080). Therefore, this variant is classified as likely pathogenic according to the recommendation of ACMG/AMP guideline. -

not provided

Pathogenic:1Uncertain:1

Uncertain significance, flagged submission	clinical testing	Revvity Omics, Revvity	Apr 16, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Sep 24, 2021	This sequence change replaces alanine with valine at codon 334 of the OCA2 protein (p.Ala334Val). The alanine residue is highly conserved and there is a small physicochemical difference between alanine and valine. This variant is not present in population databases (ExAC no frequency). This missense change has been observed in individual(s) with ocular albinism (PMID: 10649493, 29345414). In at least one individual the data is consistent with the variant being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 958). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt OCA2 protein function. For these reasons, this variant has been classified as Pathogenic. -

SKIN/HAIR/EYE PIGMENTATION 1, BLUE/NONBLUE EYES

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Baylor Genetics

Mar 04, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.82

BayesDel_addAF

Pathogenic

0.40

BayesDel_noAF

Pathogenic

0.44

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.71

.;D

Eigen

Uncertain

0.54

Eigen_PC

Uncertain

0.43

FATHMM_MKL

Uncertain

0.96

LIST_S2

Benign

0.84

T;D

M_CAP

Benign

0.080

MetaRNN

Pathogenic

0.98

D;D

MetaSVM

Pathogenic

0.83

MutationAssessor

Pathogenic

3.0

M;M

MutationTaster

Benign

1.0

A;A;A

PrimateAI

Uncertain

0.58

PROVEAN

Uncertain

-2.9

D;D

REVEL

Pathogenic

0.74

Sift

Benign

0.033

D;D

Sift4G

Uncertain

0.0080

D;D

Polyphen

1.0

D;D

Vest4

0.89

MutPred

0.81

Gain of catalytic residue at A334 (P = 0.1549);Gain of catalytic residue at A334 (P = 0.1549);

MVP

0.98

MPC

0.48

ClinPred

0.95

GERP RS

5.5

Varity_R

0.50

gMVP

0.85

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