The elucidatin of the apoptosis pathway in the nematode C. elegans has been helpful to understand apoptosis signaling pathways in higher eukaryotes. In the worm three genes
ced-3, -4 and -9 are involved in regulating the execution of apoptosis during development. Ced-3 codes for a protease homologous to the caspase family. CED-3 activity is negatively regulated by CED-9 which is homologous both structurally and functionally to Bcl-2 and other Bcl-2 family members such as Bcl-xL. To exert its function CED-9 requires the presence of CED-4, another apoptosis promoting factor....