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Timing Requirements for Insulin/IGF-1 Signaling in C. elegans
Andrew Dillin,*Douglas K. Crawford,Cynthia Kenyon
The insulin/IGF-1 (where IGF-1 is insulin-like growth
factor-1) signaling pathway influences longevity, reproduction, anddiapause in many organisms. Because of the fundamental importanceof
this system in animal physiology, we asked when during theanimal's
life it is required to regulate these different processes.We find that
in Caenorhabditis elegans, the pathway acts duringadulthood, to relatively advanced ages, to influence aging. Incontrast, it regulates diapause during development. In addition,the
pathway controls longevity and reproduction independentlyof one
another. Together our findings show that life-span regulationcan be
dissociated temporally from phenotypes that might seemto decrease the
quality of life.
Department of Biochemistry and Biophysics, University of
California, San Francisco, San Francisco, CA 94143-0448, USA.
*
Present address: Molecular and Cell Biology Laboratory, The Salk
Institute for Biological Studies, La Jolla, CA 92037, USA.
To whom correspondence should be addressed. E-mail:
ckenyon{at}biochem.ucsf.edu
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