Abstract
To conduct a case-control study to investigate the association between the polymorphism rs11656696 located in the growth arrest-specific 7 gene (GAS7)on human chromosome 17p13.1 and primary open angle glaucoma (POAG). The polymorphism rs11656696 was genotyped using the TaqMan® assay in 187 subjects comprising 92 unrelated POAG cases and 95 controls of Saudi Arabian origin. Association analysis between cases and controls revealed no significant genotype distribution under additive (p = 0.225), dominant (p = 0.635), or recessive (p = 0.085) models. Moreover, the allele frequency distribution was also nonsignificant (p = 0.70). The minor "A" allele frequency was 0.35 and 0.41 among POAG cases and controls, respectively. In addition, specific clinical indices used to assess severity of glaucoma such as intraocular pressure (IOP), cup/disk ratio, and number of antiglaucoma medications also did not show any significant genotype distribution in POAG cases. Moreover, a binary logistic regression analysis did not show any significant effect of age, sex, or genotype on disease outcome. Polymorphism rs11656696 is not associated with POAG nor any of its endophenotypic traits such as IOP and cup/disk ratio and is thus not a risk factor for POAG in this Saudi cohort.
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