Association between the rs1360780 polymorphism in FKBP5 gene and serum cortisol levels in children with autism spectrum disorder
Abstract The inconsistent results about cortisol levels in individuals with autism spectrum disorder (ASD) may be suggestive of other factors like gen polymorphisms rather than the disorder itself. So we aimed to investigate the rs1360780 polymorphism in FK506 binding protein 5 (FKBP5) gene and its relation to ASD and cortisol levels comparing with that of healthy participants. We have included two main groups as study and control groups in the present study. Eighty nine children with ASD ranging in age from 2 to 15 years were selected for the study group and age-matched 86 healthy children were selected for the control group. Cortisol levels were found to be significantly higher in the study group. However there was no statistically significant difference in terms of allele and genotype frequencies between the groups. Carrying the C allele of FKBP5 seems to increase the cortisol levels in the study group. This is the first clinical study to evaluate the association between rs1360780 polymorphism in FKBP5 gene and serum cortisol levels in children with ASD. Since the prevalence of ASD is gradually increasing in recent years, several endocrine and related genetic factors should be born in mind while examining this population.