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The development of asthma and its related phenotypes is most likely due to the polymorphism of the so-called modifier genes. The goal of this study was to evaluate the polymorphic locus rs1695 of the  GSTP1  gene association with risk factors for developing asthma and its phenotypic manifestations. This case-control study involved 164 patients with confirmed asthma diagnosis and 147 age- and sex-matched controls. Patients were divided into two groups: with ( n  = 121) and without complications ( n  = 43). Among asthmatic patients, 34 manifested hypersensitivity to household allergens. The  GSTP1  rs1695 polymorphism was genotyped using the technique of polymerase chain reaction-restriction fragment length polymorphism. There were no differences between patients and controls in allelic or genotype frequencies of polymorphic locus rs1695 of the  GSTP1  gene. However, the frequency of the A/A genotype in the patient group with complications was significantly lower than that in complication-free patients ( p  = 0.040), while the frequency of the G allele was higher in patients with complications ( p  = 0.030). The frequency of the A/A genotype was decreased in the patient group with an allergic reaction to household allergens in comparison with controls ( p  = 0.037). These results suggest that the carriage of the A/A genotype of polymorphic locus rs1695 of the  GSTP1  gene is a protective factor in the development of complications and an allergic reaction to house allergens among asthmatics, while the carriage of the G allele is associated with an increased risk for asthma complications.

Analysis of the GSTP1 rs1695 polymorphism association with the development of asthma and phenotypic manifestations