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- Title
Nek2B, a novel maternal form of Nek2 kinase, is essential for the assembly or maintenance of centrosomes in early Xenopus embryos.
- Authors
Uto, Katsuhiro; Sagata, Noriyuki
- Abstract
Nek2, a NIMA-related kinase, has been postulated to play a role in both the meiotic and mitotic cell cycles in vertebrates. Xeopus has two Nek2 splice variants, Nck2A and Nek2B, which are zygotic and maternal forms, respectively. Here we have examined the role of Nck2B in oocyte meiosis and early embryonic mitosis. Specific inhibition of Nek2B function does not interfere with the oscillation of Cdc2 activity in either the meiotic or mitotic cell cycles; however, it does cause abortive cleavage of early embryos, in which bipolar spindle formation is severely impaired due to fragmentation or dispersal of the centrosomes, to which endogenous Nek2B protein localizes. In contrast, inhibition of Nek2B function does not affect meiotic spindle formation in oocytes, in which functional centrosomes are absent. Thus, strikingly, Nek2B is specifically required for centrosome assembly and/or maintenance (and hence for normal bipolar spindle formation and cleavage) in early Xenopus embryos. Finally, (ectopic) Nek2A but not Nek2B is very labile in cleaving embryos, suggesting that Nek2A cannot replace the centrosomal function of Nek2B in early embryos.
- Subjects
CELL cycle; CENTROSOMES; SPINDLE apparatus; PROTEINS; VERTEBRATES; PROTEIN kinases; MICROTUBULES
- Publication
EMBO Journal, 2000, Vol 19, Issue 8, p1816
- ISSN
0261-4189
- Publication type
Article
- DOI
10.1093/emboj/19.8.1816