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A three-single-nucleotide polymorphism haplotype in intron 1 of OCA2 explains most human eye-color variation.

Abstract：

:We have previously shown that a quantitative-trait locus linked to the OCA2 region of 15q accounts for 74% of variation in human eye color. We conducted additional genotyping to clarify the role of the OCA2 locus in the inheritance of eye color and other pigmentary traits associated with skin-cancer risk in white populations. Fifty-eight synonymous and nonsynonymous exonic single-nucleotide polymorphisms (SNPs) and tagging SNPs were typed in a collection of 3,839 adolescent twins, their siblings, and their parents. The highest association for blue/nonblue eye color was found with three OCA2 SNPs: rs7495174 T/C, rs6497268 G/T, and rs11855019 T/C (P values of 1.02x10(-61), 1.57x10(-96), and 4.45x10(-54), respectively) in intron 1. These three SNPs are in one major haplotype block, with TGT representing 78.4% of alleles. The TGT/TGT diplotype found in 62.2% of samples was the major genotype seen to modify eye color, with a frequency of 0.905 in blue or green compared with only 0.095 in brown eye color. This genotype was also at highest frequency in subjects with light brown hair and was more frequent in fair and medium skin types, consistent with the TGT haplotype acting as a recessive modifier of lighter pigmentary phenotypes. Homozygotes for rs11855019 C/C were predominantly without freckles and had lower mole counts. The minor population impact of the nonsynonymous coding-region polymorphisms Arg305Trp and Arg419Gln associated with nonblue eyes and the tight linkage of the major TGT haplotype within the intron 1 of OCA2 with blue eye color and lighter hair and skin tones suggest that differences within the 5' proximal regulatory control region of the OCA2 gene alter expression or messenger RNA-transcript levels and may be responsible for these associations.

journal_name

Am J Hum Genet

journal_title

American journal of human genetics

authors

Duffy DL,Montgomery GW,Chen W,Zhao ZZ,Le L,James MR,Hayward NK,Martin NG,Sturm RA

doi

10.1086/510885

subject

Has Abstract

pub_date

2007-02-01 00:00:00

pages

241-52

issue

2

eissn

0002-9297

issn

1537-6605

pii

S0002-9297(07)62682-2

journal_volume

80

pub_type

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