Coordinate involvement of Nodal-dependent inhibition and Wnt-dependent activation in the maintenance of organizer-specific bmp2b in zebrafish

文献类型： 外文期刊

第一作者： Xue, Yu

作者： Xue, Yu;Zhang, Wenjuan;Chen, Canbin;Xu, Jingjin;Pan, Yutian;Xing, Cencan;Xing, Cencan;Meng, Anming

作者机构：

关键词： zebrafish;organizer-specific bmp2b;transcriptional regulation;Nodal;Wnt

期刊名称：INTERNATIONAL JOURNAL OF DEVELOPMENTAL BIOLOGY （ 影响因子：2.203； 五年影响因子：2.08 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： A vertebrate signaling center, known in zebrafish as the organizer, is essential for axis patterning and formation and is regulated by multiple cell signaling pathways, including Wnt, Nodal, and Bmp. Organizer-specific Bmp2b plays important roles in the maintenance of the Bmp activity gradient and dorsal-ventral patterning. However, it is unknown how transcription of bmp2b in the organizer is regulated. In this study, we generated a bmp2b transgenic line Tsg(-2.272bmp2b: gfp) that reproduced organizer-specific bmp2b expression. Dissection analysis revealed that a 0.273-kb minimal promoter was indispensable for bmp2b expression in the dorsal organizer. Reporter assays showed that organizer-specific bmp2b is negatively regulated by the Nodal signal and positively regulated by the Wnt signal in both embryos and cell lines. Promoter analysis and chromatin-immunoprecipitation (ChIP) indicated that one consensus Smad-binding element (SBE) (CAGAC) and one Lef/Tcf-binding element (LBE) (AGATAA) were present in the 0.273-kb promoter, and could be directly bound by Smad2 and beta-catenin proteins. Together, these results suggest that maintenance of organizer-specific bmp2b expression involves opposite and concerted regulation by Nodal and Wnt signaling.

分类号： Q132

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