Ascl1 and Neurog2 form novel complexes and regulate Delta-like3 (Dll3) expression in the neural tube.

Ascl1 and Neurog2 form novel complexes and regulate Delta-like3 (Dll3) expression in the neural tube.
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DOI:
10.1016/j.ydbio.2009.01.007
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发表时间:
2009-04-15
影响因子:
2.7
通讯作者:
Johnson, Jane E.
Johnson, Jane E.
中科院分区:
生物学3区
文献类型:
--
作者:
Henke, R. Michael;Meredith, David M.;Borromeo, Mark D.;Savage, Trisha K.;Johnson, Jane E.

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Delta样3(Dll 3)是Delta家族成员,随着神经祖细胞启动分化,其在发育中的神经系统中广泛表达。Dll 3的近端启动子序列在多个物种中是保守的,并且足以在转基因小鼠的神经管中以Dll 3样模式指导GFP表达。该启动子包含多个E盒,bHLH因子的共有结合位点。Dll 3在背神经管中的表达和Dll 3启动子的活性取决于碱性螺旋-环-螺旋(bHLH)转录因子Ascl 1(Mash 1)和Neurog 2(Ngn 2)。在Dll 3启动子中鉴定的每个E盒中的突变允许将不同的增强子或阻遏子特性单独或组合分配给每个位点。此外,每个E-box相对于bHLH因子Ascl 1、Neurog 1和Neurog 2的结合具有不同的特征。令人惊讶的是,新的Ascl 1含有DNA结合复合物的鉴定,在体外与特定的E-box网站内的Dll 3启动子。这些复合物包括Ascl 1/Ascl 1同源二聚体和Ascl 1/Neurog 2异源二聚体,在某些情况下,复合物需要额外的未定义因子来有效地结合DNA。因此,在神经管发育过程中,E-box结合蛋白的复杂相互作用在空间和时间上调节Dll 3水平。
Delta-like 3 (Dll3) is a Delta family member expressed broadly in the developing nervous system as neural progenitor cells initiate differentiation. A proximal promoter sequence for Dll3 is conserved across multiple species and is sufficient to direct GFP expression in a Dll3-like pattern in the neural tube of transgenic mice. This promoter contains multiple E-boxes, the consensus binding site for bHLH factors. Dll3 expression and the activity of the Dll3-promoter in the dorsal neural tube depends on the basic helix-loop-helix (bHLH) transcription factors Ascl1 (Mash1) and Neurog2 (Ngn2). Mutations in each E-box identified in the Dll3-promoter allowed distinct enhancer or repressor properties to be assigned to each site individually or in combination. In addition, each E-box has distinct characteristics relative to binding of bHLH factors Ascl1, Neurog1, and Neurog2. Surprisingly, novel Ascl1 containing DNA binding complexes are identified that interact with specific E-box sites within the Dll3-promoter in vitro. These complexes include Ascl1/Ascl1 homodimers and Ascl1/Neurog2 heterodimers, complexes that in some cases require additional undefined factors for efficient DNA binding. Thus, a complex interplay of E-box binding proteins spatially and temporally regulate Dll3 levels during neural tube development.
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