Association of HSP70-2 Gene 1267A/G Polymorphism With Cataract Incidence Among Guilan Population

Cataract is a visible opacity of the eye lens and it is the main reason of reversible blindness in the world. Oxidative stress is known as a major factor in cataract formation HSP70-2 protein is a molecular chaperone which is essential for cell survival in stress conditions. HSP70-2 gene is located in the human leukocyte antigen class ΙΙΙ region. This gene encodes an inducible protein. One of the common polymorphism of HSP70-2 is 1267A/G which is located in coding region. The aim of this study was to analysis of 1267A/G polymorphism of hsp70-2 gene in cataract patients.
Material and This case-control study included 118 cataract patients and 122 healthy people as a control groups. Genomic DNA was extracted from peripheral blood leukocytes and genotyping determination was performed by the polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method. Statistical analysis was performed by using the MedCalc software (Version 12.1).
The frequency of G allele was significantly higher in patients than the controls, (0.36 and 0.24, respectively). A higher frequency of the GG genotype of the HSP70-2 1267A/G polymorphism was found in the patients compared with controls (21.19% and 8.20%, respectively). The patients carrying the GG genotype were 3.2-fold at a higher risk of cataract compared with AA genotype (P=0.005).
The finding of this study suggested that the HSP70-2 1267A/G may affect the susceptibility to cataract in the studied population. Anyway the randomized multicenter studies with greater sample size still need to confirmed our results.