title: Maelstrom coordinates microtubule organization during Drosophila oogenesis through interaction with components of the MTOC.
abstract: The establishment of body axes in multicellular organisms requires accurate control of microtubule polarization. Mutations in Drosophila PIWI-interacting RNA (piRNA) pathway genes often disrupt the axes of the oocyte. This results from the activation of the DNA damage checkpoint factor Checkpoint kinase 2 (Chk2) due to transposon derepression. A piRNA pathway gene, maelstrom (mael), is critical for the establishment of oocyte polarity in the developing egg chamber during Drosophila oogenesis. We show that Mael forms complexes with microtubule-organizing center (MTOC) components, including Centrosomin, Mini spindles, and γTubulin. We also show that Mael colocalizes with αTubulin and γTubulin to centrosomes in dividing cyst cells and follicle cells. MTOC components mislocalize in mael mutant germarium and egg chambers, leading to centrosome migration defects. During oogenesis, the loss of mael affects oocyte determination and induces egg chamber fusion. Finally, we show that the axis specification defects in mael mutants are not suppressed by a mutation in mnk, which encodes a Chk2 homolog. These findings suggest a model in which Mael serves as a platform that nucleates other MTOC components to form a functional MTOC in early oocyte development, which is independent of Chk2 activation and DNA damage signaling.
authors.affiliation: Department of Molecular Biology, Keio University School of Medicine, Tokyo, Japan.
authors.forename: Kaoru
authors.initials: K
authors.lastname: Sato
authors.forename: Kazumichi M
authors.initials: KM
authors.lastname: Nishida
authors.forename: Aoi
authors.initials: A
authors.lastname: Shibuya
authors.forename: Mikiko C
authors.initials: MC
authors.lastname: Siomi
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Siomi
mesh_terms: D000818:Animals; D002455:Cell Division; D018385:Centrosome / Q000378:metabolism; D064447:Checkpoint Kinase 2; D004330:Drosophila / Q000235:genetics / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D029721:Drosophila Proteins / Q000235:genetics* / Q000378:metabolism*; D005260:Female; D022101:Microtubule-Organizing Center / Q000378:metabolism; D008870:Microtubules / Q000235:genetics / Q000378:metabolism*; D046912:Multiprotein Complexes; D009866:Oogenesis / Q000235:genetics / Q000502:physiology*; D010053:Ovary / Q000166:cytology / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism; D021381:Protein Transport; D014404:Tubulin / Q000378:metabolism
chemical_list: D029721:Drosophila Proteins; D046912:Multiprotein Complexes; D014404:Tubulin; C109767:mael protein, Drosophila; D064447:Checkpoint Kinase 2; D017346:Protein Serine-Threonine Kinases; C112435:lok protein, Drosophila
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