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Fine Mapping of Genetic Susceptibility to Polycystic Ovary Syndrome on Chromosome 19p13.2 and Tests for Regulatory Activity

Department of Genetics (D.R.S., B.A.D., W.A., K.G.E., R.S.S.), Center for Research on Reproduction and Women’s Health, and Department of Obstetrics and Gynecology (J.F.S., J.R.W.), University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104; Division of Endocrinology, Metabolism, and Molecular Medicine (M.U., A.D.), Northwestern University Medical School, Chicago, Illinois 60611; and Department of Obstetrics and Gynecology (R.S.L.), Pennsylvania State University, Hershey, Pennsylvania 17033

Address all correspondence and requests for reprints to: Dr. Richard Spielman, Department of Genetics, University of Pennsylvania. School of Medicine, Philadelphia, Pennsylvania 19104-6145. E-mail: spielman{at}pobox.upenn.edu.

Context: Little is known about genes that contribute to polycystic ovary syndrome (PCOS). We previously found linkage and association of PCOS with the dinucleotide marker D19S884 in two independent sets of families; allele 8 of D19S884 confers increased risk.

Objective/Design: The objectives of the study were: 1) use the transmission/disequilibrium test (TDT) to assess linkage and association between PCOS and D19S884 (and nearby markers) in a third set of families; and 2) test D19S884 and surrounding DNA sequence for in vitro regulatory activity in lymphoblastoid cell lines (LCLs) and granulosa cells.

Setting/Subjects: We studied 98 new families with a PCOS proband, father, mother, and other available offspring. We analyzed data from these families separately and in combination with data obtained previously.

Interventions: Interventions were venipuncture.

Main Outcome Measures: Measures were transmission frequencies and in vitro functional studies.

Results: The first result we found was that in the 98 new families, the TDT was significant for allele 8 of D19S884 (P = 0.043). In the total collection of 465 families, the TDT evidence is very strong (nominal P < 7 x 10^–5). Results for all other genetic markers near D19S884 were nonsignificant after correction for multiple testing. The second result was that an approximately 800-bp fragment containing various alleles of D19S884 showed modest but reproducible promoter activity in LCLs. However, no allelic differences were detected. No activity of this fragment was detected in granulosa cells.

Conclusions: This is the second independent confirmation of linkage and association of D19S884 with PCOS. We found in addition that some sequence in the region of D19S884 confers in vitro promoter activity in LCLs.

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