rs34731820

Variant names:

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_000275.3(OCA2):c.1109T>C(p.Ile370Thr) variant causes a missense change. The variant allele was found at a frequency of 0.000613 in 1,614,014 control chromosomes in the GnomAD database, including 9 homozygotes. 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 0.0033 ( 4 hom., cov: 32)

Exomes 𝑓: 0.00033 ( 5 hom. )

Consequence

OCA2
NM_000275.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:3

Conservation

PhyloP100: 6.22

Publications

8 publications found

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 Gene-Disease associations (from GenCC):

oculocutaneous albinism type 2
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, Ambry Genetics, G2P, ClinGen

OCA2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.01856479).

BP6

Variant 15-27990583-A-G is Benign according to our data. Variant chr15-27990583-A-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 419971.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00335 (510/152324) while in subpopulation AFR AF = 0.0119 (494/41580). AF 95% confidence interval is 0.011. There are 4 homozygotes in GnomAd4. There are 232 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 4 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OCA2	NM_000275.3 link	c.1109T>C	p.Ile370Thr	missense_variant	Exon 10 of 24	ENST00000354638.8	NP_000266.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
OCA2	ENST00000354638.8 link	c.1109T>C	p.Ile370Thr	missense_variant	Exon 10 of 24	1	NM_000275.3	ENSP00000346659.3
OCA2	ENST00000353809.9 link	c.1045-917T>C		intron_variant	Intron 9 of 22	1		ENSP00000261276.8

Frequencies

GnomAD3 genomes

AF:

0.00334

AC:

508

AN:

152206

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0119

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00191

GnomAD2 exomes

AF:

0.000868

AC:

218

AN:

251172

AF XY:

0.000604

show subpopulations

Gnomad AFR exome

AF:

0.0126

Gnomad AMR exome

AF:

0.000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000880

Gnomad OTH exome

AF:

0.000489

GnomAD4 exome

AF:

0.000328

AC:

480

AN:

1461690

Hom.:

Cov.:

AF XY:

0.000301

AC XY:

219

AN XY:

727152

show subpopulations

African (AFR)

AF:

0.0125

AC:

417

AN:

33478

American (AMR)

AF:

0.000291

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000464

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53292

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000450

AC:

AN:

1111942

Other (OTH)

AF:

0.000679

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.466

Heterozygous variant carriers

110

137

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00335

AC:

510

AN:

152324

Hom.:

Cov.:

AF XY:

0.00311

AC XY:

232

AN XY:

74492

show subpopulations

African (AFR)

AF:

0.0119

AC:

494

AN:

41580

American (AMR)

AF:

0.000654

AC:

AN:

15302

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5178

South Asian (SAS)

AF:

0.000207

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68028

Other (OTH)

AF:

0.00189

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.507

Heterozygous variant carriers

116

145

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00125

Hom.:

Bravo

AF:

0.00373

ExAC

AF:

0.000997

AC:

121

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:3

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:1

Jan 26, 2017

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The I370T variant in the OCA2 gene has been reported previously in two unrelated individuals of African descent with an unusual hypopigmentation phenotype suggestive of oculocutaneous albinism (OCA). The I370T variant was reported along with a second variant in an individual with light brown eyes and yellow-ish white colored hair. The second individual was heterozygous for the I370T variant, with no second variant identified, and had reddish-brown colored skin (Kerr et al., 2000). The I370T variant is observed in 114/10360 (1.1%) alleles from individuals of African background in the ExAC dataset, and no individuals were reported to be homozygous (Lek et al., 2016). The I370T variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position where amino acids with similar properties to Isoleucine are tolerated across species. In silico analysis predicts this variant is probably damaging to the protein structure/function. We interpret I370T as a variant of uncertain significance. -

Jan 08, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Tyrosinase-positive oculocutaneous albinism

Uncertain:1

Nov 07, 2021

Genome-Nilou Lab

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not specified

Benign:1

Oct 20, 2015

Genetic Services Laboratory, University of Chicago

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

OCA2-related disorder

Benign:1

Aug 01, 2024

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.078

BayesDel_addAF

Benign

-0.23

BayesDel_noAF

Benign

-0.10

CADD

Benign

(source)

DANN

Benign

0.91

DEOGEN2

Uncertain

0.65

Eigen

Benign

-0.25

Eigen_PC

Benign

-0.088

FATHMM_MKL

Uncertain

0.92

LIST_S2

Benign

0.81

MetaRNN

Benign

0.019

MetaSVM

Uncertain

-0.081

MutationAssessor

Benign

1.0

PhyloP100

6.2

PrimateAI

Uncertain

0.55

PROVEAN

Uncertain

-2.6

REVEL

Uncertain

0.52

Sift

Uncertain

0.0060

Sift4G

Uncertain

0.0060

Polyphen

0.0060

Vest4

0.85

MVP

0.96

MPC

0.14

ClinPred

0.042

GERP RS

4.8

Varity_R

0.27

gMVP

0.84

Mutation Taster

=15/85

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

Splicevardb

2.0

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over