title: Androgen receptor CAG repeat polymorphism and epigenetic influence among the south Indian women with Polycystic Ovary Syndrome.
abstract: The present study was carried out to assess the role of androgen receptor CAG repeat polymorphism and X chromosome inactivation (XCI) pattern among Indian PCOS women and controls which has not been hitherto explored and also to test the hypothesis that shorter CAG alleles would be preferentially activated in PCOS. CAG repeat polymorphism and X chromosome methylation patterns were compared between PCOS and non-PCOS women. 250 PCOS women and 299 controls were included for this study. Androgen receptor CAG repeat sizes, XCI percentages, and clinical and biochemical parameters were measured. The mean CAG repeat number is similar between the cases (18.74±0.13) and controls (18.73±0.12). The obese PCOS women were significantly more frequent in the <18 and >20 CAG repeat category than the lean PCOS women, yielding a highly significant odds (p=0.001). Among the women with non-random X-inactivation, alleles with <19 repeats were more frequently activated among cases than controls (p=0.33). CAG repeat polymorphism by itself cannot be considered as a useful marker for discriminating PCOS. We observed a trend of preferential activation of the shorter allele among the PCOS cases with non random XCI pattern. In the obese PCOS women, this microsatellite variation may account for the hyperandrogenicity to a larger extent than the lean PCOS women.
authors.affiliation: Molecular Anthropology Group, Biological Anthropology Unit, Indian Statistical Institute, Habsiguda, Hyderabad, India.
authors.forename: Shilpi
authors.initials: S
authors.lastname: Dasgupta
authors.forename: Pisapati V S
authors.initials: PV
authors.lastname: Sirisha
authors.forename: Kudugunti
authors.initials: K
authors.lastname: Neelaveni
authors.forename: Kathragadda
authors.initials: K
authors.lastname: Anuradha
authors.forename: Alla G
authors.initials: AG
authors.lastname: Reddy
authors.forename: Kumarasamy
authors.initials: K
authors.lastname: Thangaraj
authors.forename: B Mohan
authors.initials: BM
authors.lastname: Reddy
mesh_terms: D000293:Adolescent; D000328:Adult; D000483:Alleles; D016022:Case-Control Studies; D015331:Cohort Studies; D019175:DNA Methylation; D044127:Epigenesis, Genetic; D005260:Female; D006801:Humans; D007194:India; D008875:Middle Aged; D011085:Polycystic Ovary Syndrome / Q000235:genetics*; D011110:Polymorphism, Genetic; D011944:Receptors, Androgen / Q000235:genetics*; D020080:Tandem Repeat Sequences; D055815:Young Adult
chemical_list: D011944:Receptors, Androgen