Lack of association between insulin-like growth factor-I (IGF-I) gene polymorphism (rs35767) and power performance in professional, amateur athletes and non-athlete individuals in Iranian population

Introduction: Genetic variation between individuals may include single nucleotide polymorphisms. These individual differences could change human phenotypes (such as skeletal structure, heart and lung size). Insulinlike growth factorI (IGFI) is a critical factor in growth and exerciseassociated muscle development. In this study we analyzed the frequency of IGFI rs35767 polymorphism in karateKas athletes to find whether there is a difference among professional, amateur athletes and non KarateKas. Materials and methods: Two hundred and fiftyfour athletes (95 professional KarateKas, and 159 amateur KarateKas) and 159 nonathletic healthy individuals participated in the current study. Following provision of informed consent, 2 mL of blood samples were taken. After DNA isolation, the genotyping frequencies of the IGFI gene C/T polymorphism was assessed by restriction fragment length polymorphism (RFLP) analysis. Statistical analyses carried out using SPSS software (version 20) and data with P 0.05 were considered to be significant. Results: Frequency of T/T and C/T genotypes in comparison to C/C genotype was increased in professional KarateKas and amateur KarateKas versus to control volunteer (odd ratio 1) however, was not significant. Odd ratios of T/T and T/C genotypes compared to C/C in professional group versus controls were 1.125 (95%CI: 0.556 2.275) and 1.034 (0.538 1.984), respectively. Also, odd ratio of T/T and T/C in amateur group versus controls were 1.002 (0.535 1.876) and 1.256 (0.715 2.205), respectively. Conclusion: The IGFI gene C/T polymorphism is not significantly associated with the physical performance acute;s levels of karatekas athletes in Iranian population.