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Título : Drosophila mus301/spindle-C Encodes a Helicase With an Essential Role in Double-Strand DNA Break Repair and Meiotic Progression
Autor : McCaffrey, Ruth; St Johnston, Daniel; González-Reyes, Acaimo
Palabras clave : mus301
Drosophila
Chromosome segregation
Meiosis
DNA breaks
Recombination
Oogenesis
Fecha de publicación : nov-2006
Editor: Genetics Society of America
Citación : Genetics. 2006 November; 174(3): 1273–1285.
http://dx.doi.org/10.1534/genetics.106.058289
Resumen: mus301 was identified independently in two genetic screens, one for mutants hypersensitive to chemical mutagens and another for maternal mutants with eggshell defects. mus301 is required for the proper specification of the oocyte and for progression through meiosis in the Drosophila ovary. We have cloned mus301 and show that it is a member of the Mus308 subfamily of ATP-dependent helicases and the closest homolog of human and mouse HEL308. Functional analyses demonstrate that Mus301 is involved in chromosome segregation in meiosis and in the repair of double-strand-DNA breaks in both meiotic and mitotic cells. Most of the oogenesis defects of mus301 mutants are suppressed by mutants in the checkpoint kinase Mei41 and in MeiW68, the Spo11 homolog that is thought to generate the dsDNA breaks that initiate recombination, indicating that these phenotypes are caused by activation of the DNA damage checkpoint in response to unrepaired Mei-W68-induced dsDNA breaks. However, neither mei-W68 nor mei-41 rescue the defects in oocyte specification of mus301 mutants, suggesting that this helicase has another function in oocyte selection that is independent from its role in meiotic recombination.
Descripción : PMCID: PMC1667076
URI : http://hdl.handle.net/10261/4047
DOI: 10.1534/genetics.106.058289
ISSN: 0016-6731
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