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Departments of Genetics and Development (D.J.W.) and Obstetrics and Gynecology (D.J.W.), Center for Reproductive Sciences (Q.Z., X.W., D.J.W.), The Herbert Irving Comprehensive Cancer Center (D.J.W.), and Institute of Human Nutrition, Columbia University College of Physicians and Surgeons (D.J.W.), New York, New York 10032
Address all correspondence and requests for reprints to: Debra J. Wolgemuth, Ph.D., Department of Genetics and Development, Columbia University College of Physicians and Surgeons, 630 West 168th Street, New York, New York 10032. E-mail: djw3{at}columbia.edu
To begin to assess the function of the cell cycle regulator cyclin D3 during gametogenesis, the present study examined its expression, interacting partners, and associated kinase activity in the murine testis and ovary. In the early stages of postnatal testicular development, cyclin D3 protein was detected in spermatogonia and Leydig cells. In the adult testis, cyclin D3 was also expressed in terminally differentiating spermatids. In the embryonic ovary, detection of cyclin D3 was limited to somatic cells. In the postnatal ovary, its localization was predominantly in the nuclei of oocytes in primordial and small follicles, a localization that diminished with oocyte growth. Cdk4 and p27 were expressed in a similar subset of testicular and ovarian cells, suggesting that they may regulate cyclin D3 function during testicular and ovarian development in a cell type-specific manner. Cyclin D3-associated kinase activity was detected in immature, but not adult, testes and ovaries. These observations suggest unique roles for cyclin D3 in the control of cell division and differentiation in the germ line and the differential regulation of mitotic and meiotic cell cycles during male and female gametogenesis.
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