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Review
. 1996 Oct;6(5):545-54.
doi: 10.1016/s0959-437x(96)80082-7.

Interacting signaling pathways controlling multicellular development in Dictyostelium

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Review

Interacting signaling pathways controlling multicellular development in Dictyostelium

R A Firtel. Curr Opin Genet Dev. 1996 Oct.

Abstract

cAMP functions as the key extracellular signaling molecule controlling Dictyostelium development acting through classic G-protein-coupled/serpentine receptors. Whereas aggregation is controlled by nanomolar pulses of cAMP, a more continuous micromolar signal controls multicellular differentiation by activating a transcriptional cascade via a receptor-mediated but non G-protein-coupled pathway. Potential mechanisms by which extracellular cAMP functions to differentially control aggregation followed by morphogenesis and cell-type differentiation are discussed. This review also summarizes new findings elucidating pathways controlling cell-type regulation in this organism, including signaling cascades mediated by glycogen synthase kinase 3 and cAMP-dependent protein kinase, key regulators of cell-type differentiation in metazoans, and newly identified transcription factors.

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