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Open Access Highly Accessed Research article

YA is needed for proper nuclear organization to transition between meiosis and mitosis in Drosophila

Katharine L Sackton, Jacqueline M Lopez, Cindy L Berman and Mariana F Wolfner*

Author Affiliations

Dept of Molecular Biology and Genetics, Cornell University, Ithaca NY 14853, USA

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BMC Developmental Biology 2009, 9:43  doi:10.1186/1471-213X-9-43

Published: 23 July 2009

Abstract

Background

The Drosophila YA protein is required to initiate the embryonic cleavage divisions. After egg activation, YA enters nuclei and interacts with chromatin and the nuclear lamina. This study was designed to define more precisely the events prior to the first cleavage division that are dependent upon YA.

Results

We find that meiosis is completed normally in the absence of YA function. The first defects in embryos and eggs from mutant mothers first appear just after the completion of meiosis, and are seen as abnormal associations among the resultant haploid nuclei. These defects are associated with asynchronies in the cell cycle-dependent chromatin condensation state of the haploid nuclei. However, we find evidence of DNA replication in the absence of YA function.

Conclusion

Our data suggest YA function is needed at a control point, following meiosis II and the initiation of the first postmeiotic S phase, which is sensitive to the chromatin condensation state of the haploid meiotic products.