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Association of tumour necrosis factor-alpha -308 G/A polymorphism with primary open-angle glaucoma
Banu Bozkurt1, Lutfiye Mesci, Murat Irkec
1Department of Ophthalmology, Selcuk University, Meram Medical Faculty, Konya, Turkey. drbanubozkurt@yahoo.com
Background:
Tumour necrosis factor-alpha (TNF-α) is an important proinflammatory cytokine driving axonal degeneration and retinal ganglion cell apoptosis in glaucoma. The aim of the study was to evaluate the association of TNF-α -308 G/A and -238 G/A polymorphisms with primary open-angle glaucoma (POAG).
Design:
A prospective, case-control study, university hospital setting.
Participants:
Eighty-six POAG patients and 193 healthy unrelated controls.
Methods:
TNF-α polymorphisms were screened by using direct gene sequencing.
Main Outcome Measures:
Frequency of TNF-α -308 G/A and TNF-α -238 G/A promoter polymorphisms in glaucoma and healthy subjects.
Results:
The frequencies of TNF-α -308 GA genotype and 'A' allele were higher in patients with POAG (22.1% and 12.2%, respectively) in comparison with the control group (10.9% and 6%, respectively) (P = 0.046 and 0.02, respectively), with odds ratios of 2.45 (P = 0.01, 95% CI = 1.23-4.87) and 2.19 (P = 0.013, 95% CI = 1.18-4.08), respectively. Genotype distribution of the TNF-α -238 variants did not yield a statistically significant difference between the two groups (P = 0.87).
Conclusion:
TNF-α -308 G/A polymorphism seems to be associated with POAG in Turkish population. However, population-based studies with large number of subjects and long-term follow-up are needed to verify the association of TNF-α -308 G/A polymorphism with glaucoma susceptibility.
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