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Originally published as Genetics Published Articles Ahead of Print on April 19, 2006.
Genetics, Vol. 173, 839-847, June 2006, Copyright © 2006
doi:10.1534/genetics.105.053272
A Genetic Test of the Role of the Maternal Pronucleus in Wolbachia-Induced Cytoplasmic Incompatibility in Drosophila melanogaster
Patrick M. Ferree and William Sullivan1
Department of Molecular, Cell and Developmental Biology, University of California, Santa Cruz, California 95064
1 Corresponding author: Department of Molecular, Cell and Developmental Biology, 319 Sinsheimer Bldg., 1156 High St., University of California, Santa Cruz, CA 95064.
E-mail: sullivan{at}biology.ucsc.edu
Cytoplasmic incompatibility (CI) is a reproductive sterility found in arthropods that is caused by the endoparasitic bacteria Wolbachia. In CI, host progeny fail to develop during early embryogenesis if Wolbachia-infected males fertilize uninfected females. It is widely accepted that this lethality is caused by some unknown Wolbachia-induced modification of the paternal nuclear material in the host testes. However, the direct means by which this modification leads to early embryonic death are currently unresolved. Results from previous studies suggested that CI lethality occurs as a result of asynchrony in cell cycle timing between the paternal and maternal pronuclei. This hypothesis can be tested experimentally by the prediction that the Wolbachia-modified paternal pronucleus should support androgenetic development (i.e., from the paternal pronucleus only). Using specific mutations in Drosophila melanogaster that produce androgenetic progeny, we demonstrate that the Wolbachia-induced modification inhibits this type of development. This result suggests that CI occurs independently of the maternal pronucleus and argues against pronuclear asynchrony as the primary cause of CI lethality. We propose that CI occurs instead as the result of either a developmentally incompetent paternal pronucleus or asynchrony between the paternal pronucleus and the cell cycle of the egg cytoplasm.
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