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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

FGF signaling functions in the hypodermis to regulate fluid balance in C. elegans.

Signaling by the Caenorhabditis elegans fibroblast growth factor receptor EGL-15 is activated by LET-756, a fibroblast growth factor, and attenuated by CLR-1, a receptor tyrosine phosphatase. Hyperactive EGL-15 signaling results in a dramatic Clr phenotype characterized by the accumulation of clear fluid within the pseudocoelomic space, suggesting that regulated EGL-15 signaling is essential for fluid homeostasis in C. elegans. To determine the cellular focus of EGL-15 signaling, we identified an enhancer element (e15) within the egl-15 promoter, which is both necessary for the promoter activity and sufficient when duplicated to drive either egl-15 or clr-1 rescue activity. This enhancer drives GFP expression in hypodermal cells. Consistent with this finding, immunofluorescence studies of EGL-15 indicate that EGL-15 is expressed in hypodermal cells, and hypodermal promoters can drive full clr-1 and egl-15 rescue activity. Moreover, a mosaic analysis of mpk-1, which acts downstream of egl-15, suggests that its suppression of Clr (Soc) function is required in the hypodermis. These results suggest that EGL-15 and CLR-1 act in the hypodermis to regulate fluid homeostasis in worms.[1]


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