CELL CYCLE REGULATION
IN OOGENESIS
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Mary
Lilly, Ph.D., Principal Investigator Amy Hong, Ph.D., Postdoctoral Fellow Takako Iida, Ph.D., Postdoctoral Fellow Isamu Sugimura, Ph.D., Postdoctoral Fellow Julia Fisher, Predoctoral Fellow |
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The Unit on Cell Cycle Regulation uses Drosophila oogenesis as a model system to examine the developmental regulation of the cell cycle. Current research in the unit focuses on two problems: the switch from the mitotic cycle to the meiotic cycle and the relationship between cell cycle regulation and oocyte differentiation. Animal oocytes undergo a highly conserved developmental arrest in prophase
of meiosis I. Often this stage marks a period of rapid growth for the
oocyte and is necessary to coordinate meiotic progression with the developmental
events of oogenesis. In Drosophila, a single oocyte develops within a
16-cell germline cyst. Throughout much of oogenesis, the oocyte remains
arrested in prophase of meiosis I. In contrast, its 15 mitotic sisters
enter the endocycle and become polyploid in preparation for their role
as nutritive nurse cells. How germline cysts establish and maintain these
two independent cell cycles is unknown. We have demonstrated a role for
the p21CIP/p27Kip1/p57Kip2-like cyclin-dependent kinase inhibitor (cki)
dacapo (Dap) in the maintenance of the prophase I meiotic arrest of the
Drosophila oocyte. In Drosophila cyclinE-Cdk2, activity is required for
entry into S phase. In the absence of Dap, the oocyte enters the endocycle
and develops as a nurse cell. These studies have revealed a novel meiotic
function for the Cip/Kip family of Cdk inhibitors. We are continuing to
examine how Dap is spatially and temporally regulated during germline
cyst formation and maturation.
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PUBLICATIONS 1. Calvi B, Lilly M, Spradling AC. Cell cycle regulation of chorion gene amplification. Genes Dev 1998;12:734-744.2. Lilly MA, de Cuevas M, Spradling AC. Cyclin A associates with the fusome during germline cyst formation in the Drosophila ovary. Dev Biol 2000; 218:53-63. |
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