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JOURNAL ARTICLES
A novel WD40 protein, CHE-2, acts cell-autonomously in the formation of C. elegans sensory cilia
M. Fujiwara, T. Ishihara, I. Katsura
Development 1999 126: 4839-4848;

Summary

To elucidate the mechanism of sensory cilium formation, we analyzed mutants in the Caenorhabditis elegans che-2 gene. These mutants have extremely short cilia with an abnormal posterior projection, and show defects in behaviors that are mediated by ciliated sensory neurons. The che-2 gene encodes a new member of the WD40 protein family, suggesting that it acts in protein-protein interaction. Analysis of mutation sites showed that both the amino-terminal WD40 repeats and the carboxyl-terminal non-WD40 domain are necessary for the CHE-2 function. CHE-2-tagged green fluorescent protein is localized at the cilia of almost all the ciliated sensory neurons. Expression of che-2 in a subset of sensory neurons of a che-2 mutant by using a heterologous promoter resulted in restoration of the functions and cilium morphology of only the che-2-expressing neurons. Thus, che-2 acts cell-autonomously. This technique can be used in the future for determining the function of each type of che-2-expressing sensory neuron. Using green fluorescent protein, we found that the extension of cilia in wild-type animals took place at the late embryonic stage, whereas the cilia of che-2 mutant animals remained always short during development. Hence, the abnormal posterior projection is due to the inability of cilia to extend, rather than degeneration of cilia once correctly formed. Expression of che-2 in a che-2 mutant under a heat shock promoter showed that the extension of cilia, surprisingly, can occur even at the adult stage, and that such cilia can function apparently normally in behavior.

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JOURNAL ARTICLES
A novel WD40 protein, CHE-2, acts cell-autonomously in the formation of C. elegans sensory cilia
M. Fujiwara, T. Ishihara, I. Katsura
Development 1999 126: 4839-4848;
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