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Genes Dev. 2004 Oct 15;18(20):2529-44.

Identification of C. elegans DAF-12-binding sites, response elements, and target genes.

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  • 1Program in Biochemistry and Molecular Biology, University of California, San Francisco, California 94143-2280, USA.


Intracellular receptor DAF-12 regulates dauer formation and developmental age and affects Caenorhabditis elegans lifespan. Genetic analyses place DAF-12 at the convergence of several signal transduction pathways; however, the downstream effectors and the molecular basis for the receptor's multiple physiological outputs are unknown. Beginning with C. elegans genomic DNA, we devised a procedure for multiple rounds of selection and amplification that yielded fragments bearing DAF-12-binding sites. These genomic fragments mediated DAF-12-dependent transcriptional regulation both in Saccharomyces cerevisiae and in C. elegans; that is, they served as functional DAF-12 response elements. We determined that most of the genomic fragments that displayed DAF-12 response element activity in yeast were linked to genes that were regulated by DAF-12 in C. elegans; indeed, the response element-containing fragments typically resided within clusters of DAF-12-regulated genes. DAF-12 target gene regulation was developmental program and stage specific, potentially predicting a fit of these targets into regulatory networks governing aspects of C. elegans reproductive development and dauer formation.

[PubMed - indexed for MEDLINE]
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