Endothelial nitric oxide gene polymorphism and risk of systemic sclerosis: predisposition effect of T-786C promoter and protective effect of 27 bp repeats in Intron 4.

Abstract:

OBJECTIVES:An impaired availability of nitric oxide (NO), related to polymorphisms in endothelial nitric oxide synthase (eNOS) gene, may influence the microvasculature in systemic Sclerosis (SSc). Three potential eNOS gene polymorphisms [tandem 27-bp repeats (VNTR) in intron 4, T786C in promoter region and G894T in exon 7] were investigated to affect the susceptibility to and the clinical course of SSc. METHODS:Fifty-nine patients with SSc (mean age 47,1+/-12,1 years) and 83 control subjects (mean age 41,1+/-12,8 years) were studied. Genotypes were determined through PCR with or without RFLP. RESULTS:Genotype distribution was significantly different between SSc patients and controls for intron 4aa (alleles for four repeats), genotype frequency being 3.4% and 17.1%, respectively (odds ratio for dominant effect, 0.35; 95% CI, 0.17 to 0.78; p=0.004). The CC genotype of the promoter was significantly high in frequency in the SSc patients (16.9%) compared to controls (7.3%) (odds ratio for dominant effect, 2.26; 95% CI: 1.14 to 4.48; p=0.020). CONCLUSIONS:Intron 4 aa genotype of eNOS gene is protective and homozygosity (CC) of T-786C promoter region is a risk factor for SSc in Turkish population. Our results highlight a possible mechanism by which a potential reduced availability of NO, related to VNTR in intron 4 and T-786C promoter polymorphism, may influence the predisposition to SSc.

journal_name

Clin Exp Rheumatol

authors

Sinici I,Kalyoncu U,Karahan S,Kiraz S,Atalar E

subject

Has Abstract

pub_date

2010-03-01 00:00:00

pages

169-75

issue

2

eissn

0392-856X

issn

1593-098X

pii

263

journal_volume

28

pub_type

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