A network of broadly expressed HLH genes regulates tissue-specific cell fates.

A network of broadly expressed HLH genes regulates tissue-specific cell fates.
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广泛表达的HLH基因的网络调节组织特异性细胞命运。

DOI:
10.1016/j.cell.2011.08.055
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发表时间:
2011-11-11
期刊:
影响因子:
64.5
通讯作者:
Baker NE
Baker NE
中科院分区:
生物学1区
文献类型:
--
作者:
Bhattacharya A;Baker NE

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特定的基本螺旋环受阻(bHLH)转录因子的空间和时间表达定义了许多类型的分化。我们发现,这些特定因子的异源二聚体伴侣的更广泛表达也通过不同的机制受到高度调节。一个交叉相互作用的调节网络连接果蝇E-蛋白Daughterless的表达,需要异源二聚体与bHLH蛋白,表达的Id蛋白Extramacrochaetae,bHLH蛋白的拮抗剂。偶联的转录反馈环保持广泛的Extramacrochaetae表达,其抑制Daughterless表达,反对bHLH依赖性分化,同时增强生长和细胞存活。当细胞外信号抑制extramacrochaetae时,Daughterless表达则能够增加。这定义了前神经外胚层的区域,独立于前神经bHLH基因。类似的调节在多种果蝇组织和哺乳动物细胞中被发现,并且可能是HLH蛋白的发育调节的保守的一般特征。
Spatial and temporal expression of specific basic Helix-Loop-Helix (bHLH) transcription factors defines many types of differentiation. We find that the much broader expression of the heterodimer partners of these specific factors is also highly regulated, through a distinct mechanism. A cross-interacting regulatory network links expression of the Drosophila E-protein Daughterless, required to heterodimerize with bHLH proteins, with expression of the Id protein Extramacrochaetae, an antagonist of bHLH proteins. Coupled transcriptional feedback loops maintain the widespread Extramacrochaetae expression that restrains Daughterless expression, opposing bHLH-dependent differentiation while enhancing growth and cell survival. Where extracellular signals repress extramacrochaetae, Daughterless expression is then able to increase. This defines regions of proneural ectoderm, independently from the proneural bHLH genes. Similar regulation is found in multiple Drosophila tissues and in mammalian cells, and may be a conserved general feature of developmental regulation by HLH proteins.
DOI: 10.1126/science.2035025
发表时间: 1991-05-17
期刊: SCIENCE
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