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  • Title: Mosaic analysis of the let-23 gene function in vulval induction of Caenorhabditis elegans.
    Author: Koga M, Ohshima Y.
    Journal: Development; 1995 Aug; 121(8):2655-66. PubMed ID: 7671826.
    Abstract:
    The let-23 receptor tyrosine kinase gene is required for vulval induction and larval survival in the nematode Caenorhabditis elegans. We carried out genetic mosaic analyses of the let-23 gene function by using the cloned let-23 and ncl-1 genes. The wild-type let-23 gene was required in a vulval precursor cell to adopt the 1 degree vulval fate in animals carrying a let-23 vulvaless or lethal chromosomal mutation. In almost all the animals, vulval precursor cells adjacent to a 1 degree fate cell were induced to the 2 degrees vulval fate regardless of the let-23 genotypes. These findings indicate that the vulval induction signal from an anchor cell induces a vulval precursor cell to adopt the 1 degree fate through LET-23, and then a 1 degree fate cell induces adjacent cells to adopt the 2 degrees fate, for which LET-23 is not required. Foci of lethality of the let-23 (mn23) mutation were found in ABal and ABplp lineages.
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