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MAP kinase signaling specificity mediated by the LIN-1 Ets/LIN-31 WH transcription factor complex during C. elegans vulval induction.

Cell. 1998 May 15;93(4):569-80
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摘要


The let-23 receptor/mpk-1 MAP kinase signaling pathway induces the vulva in C. elegans. We show that MPK-1 directly regulates both the LIN-31 winged-helix and the LIN-1 Ets transcription factors to specify the vulval cell fate. lin-31 and lin-1 act genetically downstream of mpk-1, and both proteins can be directly phosphorylated by MAP kinase. LIN-31 binds to LIN-1, and the LIN-1/LIN-31 complex inhibits vulval induction. Phosphorylation of LIN-31 by MPK-1 disrupts the LIN-1/LIN-31 complex, relieving vulval inhibition. Phosphorylated LIN-31 may also act as a transcriptional activator, promoting vulval cell fates. LIN-31 is a vulval-specific effector of MPK-1, while LIN-1 acts as a general effector. The partnership of tissue-specific and general effectors may confer specificity onto commonly used signaling pathways, creating distinct tissue-specific outcomes.

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