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2017 ; 7
(ä): 46135
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Notch and Hippo signaling converge on Strawberry Notch 1 (Sbno1) to
synergistically activate Cdx2 during specification of the trophectoderm
#MMPMID28401892
Watanabe Y
; Miyasaka KY
; Kubo A
; Kida YS
; Nakagawa O
; Hirate Y
; Sasaki H
; Ogura T
Sci Rep
2017[Apr]; 7
(ä): 46135
PMID28401892
show ga
The first binary cell fate decision occurs at the morula stage and gives rise to
two distinct types of cells that constitute the trophectoderm (TE) and inner cell
mass (ICM). The cell fate determinant, Cdx2, is induced in TE cells and plays an
essential role in their differentiation and maintenance. Notch and Hippo
signaling cascades are assumed to converge onto regulatory elements of Cdx2,
however, the underlying molecular mechanisms are largely unknown. Here, we show
involvement of Strawberry Notch1 (Sbno1), a novel chromatin factor of the
helicase superfamily 2, during preimplantation development. Sbno1 knockout
embryos die at the preimplantation stage without forming a blastocoel, and Cdx2
is not turned on even though both Yap and Tead4 reside normally in nuclei.
Accordingly, Sbno1 acts on the trophectoderm-enhancer (TEE) of Cdx2, ensuring its
robust and synergistic activation by the Yap/Tead4 and NICD/Rbpj complexes.
Interestingly, this synergism is enhanced when cells are mechanically stretched,
which might reflect that TE cells are continuously stretched by the expanding ICM
and blastocoel cavity. In addition, the histone chaperone, FACT (FAcilitates
Chromatin Transcription) physically interacts with Sbno1. Our data provide new
evidence on TE specification, highlighting unexpected but essential functions of
the highly conserved chromatin factor, Sbno1.