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Tight control of cell proliferation is essential for proper growth during development and for tissue homeostasis in mature animals. The evolutionarily conserved Hippo pathway restrains proliferation through a kinase cascade that culminates in the inhibition of the transcriptional coactivator YAP. Unphosphorylated YAP activates genes involved in cell proliferation and survival by interacting with a DNA-binding factor. Here we show that during vertebrate neural tube development, the TEA domain transcription factor (TEAD) is the cognate DNA-binding partner of YAP. YAP and TEAD gain of function causes marked expansion of the neural progenitor population, partly owing to their ability to promote cell cycle progression by inducing  cyclin D1  and to inhibit differentiation by suppressing  NeuroM . Their loss of function results in increased apoptosis, whereas repressing their target genes leads to premature neuronal differentiation. Inhibiting the upstream kinases of the Hippo pathway also causes neural progenitor overproliferation. Thus, the Hippo pathway plays critical roles in regulating neural progenitor cell number by affecting proliferation, fate choice, and cell survival.

YAP regulates neural progenitor cell number via the TEA domain transcription factor