YY1 regulates the neural crest-associated slug gene in Xenopus laevis

被引:36
作者
Morgan, MJ
Woltering, JM
Rieden, PMJID
Durston, AJ
Thiery, JP
机构
[1] Inst Curie, CNRS, UMR 144, F-75248 Paris 05, France
[2] Netherlands Inst Dev Biol, Hubrecht Lab, NL-3584 CT Utrecht, Netherlands
关键词
D O I
10.1074/jbc.M406140200
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
slug gene expression is associated with the specification and migration of neural crest cells in the African clawed frog Xenopus laevis. We provide evidence that the protein Ying-Yang 1 (YY1) regulates the slug gene expression both indirectly and directly, via a YY1 cis-element in the slug promoter, during Xenopus development. The ability of the YY1 to bind this YY1 cis-element was confirmed by electromobility shift assays and reporter assays. YY1 was detected in the nuclei of ectodermal cells contemporaneously with the process of neural crest specification. The injection of anti-YY1 morpholino, which targeted both YY1alpha and YY1beta gene products, depleted YY1 expression below 20% and was lethal at gastrulation. Sublethal depletion of YY1 reduced the length of the anterior-posterior axis and severely inhibited the expression of the neural marker Nrp1 and of the slug gene. Overexpression of YY1 or mutation of the YY1 cis-element reduced the restricted spatial expression of the slug reporter gene in the neural ectoderm border and provoked its expression in the nonneural ectoderm. Chromatin immunoprecipitation indicated that endogenous YY1 interacts directly with the YY1 cis-element of the endogenous slug gene and with the slug gene reporter sequence injected into embryos. The results suggest that YY1 is essential for Xenopus development; is necessary for neural ectoderm differentiation, a prerequisite for neural crest specification; and restricts which cells can form neural crest mesenchyme through directly blocking slug gene activity.
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页码:46826 / 46834
页数:9
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