A C. elegans mediator protein confers regulatory selectivity on lineage-specific expression of a transcription factor gene

AUTOR(ES)

Zhang, Hong

FONTE

Cold Spring Harbor Laboratory Press

RESUMO

The Caenorhabditis elegans caudal homolog, pal-1, is required for neurogenesis in the male tail. We show that expression of pal-1 in the postembryonic neuroblast cell V6 can be initiated by two alternate pathways. One pathway, acting in wild type, requires a regulatory element in the fifth pal-1 intron. The other pathway, independent of this element, is normally repressed by the newly identified gene sop-1, which encodes a homolog of the mammalian Mediator complex protein TRAP230. In sop-1 mutants, pal-1 is activated by a pathway that is stimulated by bar-1/β-catenin, a component of the Wnt signal transduction pathway. The results support a physiological role of the Mediator complex in conveying regulatory signals to the transcriptional apparatus.

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