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unc-83 encodes a novel component of the ... al for proper nuclear migration
unc-83 encodes a novel component of the nuclear envelope and is essential for proper nuclear migration.
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Nuclear migration plays an essential role in the growth and development of a wide variety of eukaryotes. Mutations in unc-84, which encodes a conserved component of the nuclear envelope, have been shown to disrupt nuclear migration in two C. elegans tissues. We show that mutations in unc-83 disrupt nuclear migration in a similar manner in migrating P cells, hyp7 precursors and the intestinal primordium, but have no obvious defects in the association of centrosomes with nuclei or the structure of the nuclear lamina of migrating nuclei. We also show that unc-83 encodes a novel transmembrane protein. We identified three unc-83 transcripts that are expressed in a tissue-specific manner. Antibodies against UNC-83 co-localized to the nuclear envelope with lamin and UNC-84. Unlike UNC-84, UNC-83 localized to only specific nuclei, many of which were migratory. UNC-83 failed to localize to the nuclear envelope in unc-84 mutants with lesions in the conserved SUN domain of UNC-84, and UNC-83 interacted with the SUN domain of UNC-84 in vitro, suggesting that these two proteins function together during nuclear migration. We favor a model in which UNC-84 directly recruits UNC-83 to the nuclear envelope where they help transfer force between the cytoskeleton and the nucleus.
Starr DA, Hermann GJ, Malone CJ, Fixsen W, Priess JR, Horvitz HR, Han M
Development (Cambridge, England)
2001-12-01 00:00
128
24
5039-50
Active Transport, Cell Nucleus,Animals,Caenorhabditis elegans,Caenorhabditis elegans Proteins,Cell Compartmentation,Cell Nucleus,Centrosome,Cloning, Molecular,Intestines,Membrane Glycoproteins,Membrane Proteins,Microtubules,Movement,Nuclear Envelope,Nuclear Matrix,Nuclear Proteins,RNA, Antisense,RNA, Small Interfering,Caenorhabditis elegans Proteins,Membrane Glycoproteins,Membrane Proteins,Nuclear Proteins,RNA, Antisense,RNA, Small Interfering,Unc-83 protein, C elegans,Unc-84 protein, C elegans
Howard Hughes Medical Institute and Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, CO 80309, USA
Development
NHLBI F32-HL10449, NIGMS GM24663, NIGMS GM47869, NCI P30-CA46934
0950-1991
538
True
11748140
