A system of repressor gradients spatially organizes the boundaries of Bicoid-dependent target genes.

A system of repressor gradients spatially organizes the boundaries of Bicoid-dependent target genes.
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DOI:
10.1016/j.cell.2012.03.018
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发表时间:
2012-04-27
期刊:
影响因子:
64.5
通讯作者:
Small S
Small S
中科院分区:
生物学1区
文献类型:
--
作者:
Chen H;Xu Z;Mei C;Yu D;Small S

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同源结构域(HD)蛋白Bicoid(Bcd)被认为是通过阈值依赖性激活机制定位靶基因边界的梯度形态原。在这里,我们分析了66 Bcd依赖的调控元件,并表明,它们的边界定位主要是由抑制梯度拮抗Bcd介导的激活。一个主要的阻遏物是成对规则蛋白Runt,它以相反的梯度表达,并且对于限制Bcd依赖性激活是必要的和足够的。有证据表明,Runt功能与母亲的阻遏Capicua和差距蛋白Kruppel作为一个镇压系统的主要组成部分,正确地命令整个胚胎的前半部分的边界。这些结果在概念上限制了Bcd形态发生假说,并证明了Bcd梯度如何在基因网络中发挥作用,从而形成胚胎。
The homeodomain (HD) protein Bicoid (Bcd) is thought to function as a gradient morphogen that positions boundaries of target genes via threshold-dependent activation mechanisms. Here we analyze 66 Bcd-dependent regulatory elements, and show that their boundaries are positioned primarily by repressive gradients that antagonize Bcd-mediated activation. A major repressor is the pair-rule protein Runt, which is expressed in an opposing gradient, and is necessary and sufficient for limiting Bcd-dependent activation. Evidence is presented that Runt functions with the maternal repressor Capicua and the gap protein Kruppel as the principal components of a repression system that correctly orders boundaries throughout the anterior half of the embryo. These results put conceptual limits on the Bcd morphogen hypothesis, and demonstrate how the Bcd gradient functions within the gene network that patterns the embryo.
DOI: 10.1002/j.1460-2075.1990.tb07440.x
发表时间: 1990-08-01
期刊: EMBO JOURNAL
影响因子: 11.4
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