These new findings came from the $6 million National Institutes of Health-funded National Centers Program for Infertility Research. The study was led by Northwestern University researcher Andrea Dunaif, M.D., Charles F. Kettering Professor, chief of endocrinology and metabolism and professor of medicine at The Feinberg School of Medicine, and collaborators at Pennsylvania State University and the University of Pennsylvania.
Dunaif and co-investigators believe the location of the PCOS gene mutation is on chromosome 19, near the insulin receptor gene, which plays a key role in allowing insulin to enter cells and metabolize sugar. This marker, called allele 8 of D19S884, was associated with risk factors for diabetes in PCOS women and their brothers.
In recently published studies, approximately 50 percent of the sisters of PCOS women had elevated androgen (so-called "male hormones" that are present in both men and women) levels while the other half of the sisters were unaffected. Of the high-androgen group, half (or 25 percent of the sisters) had PCOS and insulin resistance, while the other 25 percent were insulin resistant but showed no PCOS symptoms and had normal menstrual periods.
The PCOS sisters and those with high androgen levels were more obese than unaffected sisters.
The PCOS brothers also had significantly elevated levels of the androgen DHEAS, which correlated with the high androgen levels in their sisters with PCOS.
These results strongly suggest that the same gene defect is responsible for PCOS and the hormonal abnormalities and other symptoms found in the siblings of PCOS-affected women, but further studies are required, Du
Contact: Elizabeth Crown