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The Eya1 Phosphatase Promotes Shh Signaling during Hindbrain Development and Oncogenesis
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Published Date:
Mar 26 2015
Publisher's site:Source:Dev Cell. 2015; 33(1):22-35.
[PDF-2.13 MB]
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Alternative Title:Dev Cell
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Description:Sonic hedgehog (Shh) signaling is critical in development and oncogenesis, but the mechanisms regulating this pathway remain unclear. Although protein phosphorylation clearly affects Shh signaling, little is known about phosphatases governing the pathway. Here, we conducted a small hairpin RNA (shRNA) screen of the phosphatome and identified Eya1 as a positive regulator of Shh signaling. We find that the catalytically active phosphatase Eya1 cooperates with the DNA-binding protein Six1 to promote gene induction in response to Shh and that Eya1/Six1 together regulate Gli transcriptional activators. We show that Eya1, which is mutated in a human deafness disorder, branchio-oto-renal syndrome, is critical for Shh-dependent hindbrain growth and development. Moreover, Eya1 drives the growth of medulloblastoma, a Shh-dependent hindbrain tumor. Together, these results identify Eya1 and Six1 as key components of the Shh transcriptional network in normal development and in oncogenesis.
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Subject:
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Pubmed ID:25816987
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Pubmed Central ID:PMC4418443
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