| Nek2B, a novel maternal form of Nek2 kinase, is essential for the assembly or maintenance of centrosomes in early Xenopus embryos. | |
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MedLine Citation:
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PMID: 10775266 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Nek2, a NIMA-related kinase, has been postulated to play a role in both the meiotic and mitotic cell cycles in vertebrates. Xenopus has two Nek2 splice variants, Nek2A and Nek2B, which are zygotic and maternal forms, respectively. Here we have examined the role of Nek2B 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. |
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Authors:
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K Uto; N Sagata |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The EMBO journal Volume: 19 ISSN: 0261-4189 ISO Abbreviation: EMBO J. Publication Date: 2000 Apr |
Date Detail:
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Created Date: 2000-06-13 Completed Date: 2000-06-13 Revised Date: 2009-11-19 |
Medline Journal Info:
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Nlm Unique ID: 8208664 Medline TA: EMBO J Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 1816-26 Citation Subset: IM |
Affiliation:
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Department of Biology, Graduate School of Science, Kyushu University, Hakozaki 6-10-1, Fukuoka 812-8581, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Blotting, Western CDC2 Protein Kinase / metabolism Cell Cycle Centrosome / physiology* Cycloheximide / pharmacology Embryo, Nonmammalian / physiology Enzyme Activation Female Isoenzymes* Meiosis Microscopy, Confocal Mitosis Oocytes / physiology Progesterone / metabolism Protein Biosynthesis Protein Synthesis Inhibitors / pharmacology Protein-Serine-Threonine Kinases / chemistry* Time Factors Transcription, Genetic Xenopus / embryology* Xenopus Proteins* |
| Chemical | |
Reg. No./Substance:
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0/Isoenzymes; 0/Protein Synthesis Inhibitors; 0/Xenopus Proteins; 57-83-0/Progesterone; 66-81-9/Cycloheximide; EC 2.7.1.-/Nek2A protein, Xenopus; EC 2.7.1.-/Nek2B protein, Xenopus; EC 2.7.11.1/Protein-Serine-Threonine Kinases; EC 2.7.11.22/CDC2 Protein Kinase |
| Comments/Corrections | |
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