Endothelial nitric oxide synthase gene polymorphism and type 2 diabetic retinopathy among Asian Indians.

Abstract:

:Endothelial nitric oxide synthase (eNOS) has been shown to play an essential role in retinal vascular function, and disequilibrium in its production can lead to diabetic retinopathy (DR). Genetic polymorphisms of eNOS gene have been suggested to play a role in nitric oxide (NO) abnormalities which may contribute to the development and progression of DR. In view of the variable results that have been reported for the association between eNOS gene polymorphisms and DR, the present study was designed to study the association and interaction between eNOS gene polymorphisms and the development and progression of DR in Asian Indian type 2 diabetes mellitus patients (T2DM). We screened 1,720 T2DM patients, belonging to two independently ascertained cohorts out of which 1,446 were genotyped for three polymorphisms of eNOS (two SNPs: T-786C, G894T and one 27-bp repeat polymorphism in intron 4 (27VNTR)) using validated PCR-RFLP assays. In both the cohorts, consistently lower prevalence and decreased risk of DR was observed in patients with ba, aa and ba + aa genotype of 27VNTR (a/b), C-a-G and C-a-T haplotype (allele of T-786C, 27VNTR a/b and G894T) carrying "C" allele of T-786C and "a" allele of 27VNTR (a/b). Also, mean NO levels in T2DM subjects carrying ba + aa genotype were higher as compared to bb genotype. Our results suggest that eNOS genotypes 27VNTR carrying "aa" genotype is an independent protective factor for DR and is associated with low risk of DR.

journal_name

Acta Diabetol

journal_title

Acta diabetologica

authors

Cheema BS,kohli HS,Sharma R,Bhansali A,Khullar M

doi

10.1007/s00592-012-0437-7

subject

Has Abstract

pub_date

2012-12-01 00:00:00

pages

481-8

issue

6

eissn

0940-5429

issn

1432-5233

journal_volume

49

pub_type

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