Abstract
CYP2D6 is one of the most widely investigated CYPs in relation to gene polymorphism. This study analyzed the relationship between CYP2D6 rs35742686 and rs3892097 single-nucleotide polymorphisms (SNPs) and potential risk factors in the development of acute lymphoblastic leukemia (ALL) in Kashmiri children. We recruited 300 cases and 600 controls for genotyping and risk factors assessment. Genotypes of rs35742686 and rs3892097 were analyzed by polymerase chain reaction-restriction fragment length polymorphism method. CYP2D6 expression analysis was done by quantitative reverse transcription polymerase chain reaction in ALL cases. Conditional logistic regression models were used to calculate odds ratios (OR) and 95% confidence intervals (CI). High risk of ALL was observed in cases who carried the mutant genotypes of rs35742686 (OR = 18.15; 95% CI = 4.13-79.66, p < 0.0001) or rs3892097 (OR = 24.06; 95% CI = 10.23-56.53, p < 0.0001). Significant interaction was observed between rs35742686 and rs3892097 SNPs (P interaction = 0.001). The risk associated with the variant genotypes of rs35742686 and rs3892097 was retained in the cases whose fathers were smokers or had maternal X-ray exposure ( p < 0.001). Relative messenger ribonucleic acid expression across genotypes was significantly decreased in cases carrying rs35742686 3 (*3/*3) ( n -fold = 0.37 ± 0.156, p < 0.0079) and rs3892097 SNPs (*4/*4) ( n -fold = 0.02 ± 0.0075, p < 0.0001) suggesting these two events are independent in ALL cases. The study concluded that rs35742686 and rs3892097 SNPs are significantly associated with ALL risk in Kashmiri children.
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