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The Caenorhabditis elegans homologue of deleted in azoospermia is involved in the sperm/oocyte switch.

Mol. Biol. Cell. 2006 Jul;17(7):3147-55. Epub 2006 Apr 26
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摘要


The Deleted in Azoospermia (DAZ) gene family encodes putative translational activators that are required for meiosis and other aspects of gametogenesis in animals. The single Caenorhabditis elegans homologue of DAZ, daz-1, is an essential factor for female meiosis. Here, we show that daz-1 is important for the switch from spermatogenesis to oogenesis (the sperm/oocyte switch), which is an essential step for the hermaphrodite germline to produce oocytes. RNA interference of the daz-1 orthologue in a related nematode, Caenorhabditis briggsae, resulted in a complete loss of the sperm/oocyte switch. The C. elegans hermaphrodite deficient in daz-1 also revealed a failure in the sperm/oocyte switch if the genetic background was conditional masculinization of germline. DAZ-1 could bind specifically to mRNAs encoding the FBF proteins, which are translational regulators for the sperm/oocyte switch and germ stem cell proliferation. Expression of the FBF proteins seemed to be lowered in the daz-1 mutant at the stage for the sperm/oocyte switch. Conversely, a mutation in gld-3, a gene that functionally counteracts FBF, could partially restore oogenesis in the daz-1 mutant. Together, we propose that daz-1 plays a role upstream of the pathway for germ cell sex determination.

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