Acheate-scute like 1 (Ascl1) is required for normal delta-like (Dll) gene expression and notch signaling during retinal development.

Acheate-scute like 1 (Ascl1) is required for normal delta-like (Dll) gene expression and notch signaling during retinal development.
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DOI:
10.1002/dvdy.21848
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发表时间:
2009-09
影响因子:
2.5
通讯作者:
Reh, Thomas A.
Reh, Thomas A.
中科院分区:
生物学3区
文献类型:
--
作者:
Nelson, Branden R.;Hartman, Byron H.;Ray, Catherine A.;Hayashi, Toshinori;Bermingham-McDonogh, Olivia;Reh, Thomas A.

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果蝇中的 Delta 基因表达受到原神经 bHLH 转录因子(例如 acheate-scute)的调节。在脊椎动物中,多个 Delta 样和原神经 bHLH 基因在神经发生过程中表达,尤其是在视网膜中。我们最近在小鸡视网膜祖细胞中发现了 Acheate-scute like 1 (Ascl1)、Delta 样基因和 Notch 之间的关系。在这里,我们报告哺乳动物视网膜祖细胞也是 Delta 样基因的主要来源,可能通过 Notch 在它们之间发出信号,同时分化神经元表达 Jagged2。 Ascl1 在 Delta 样和 Notch 活性祖细胞中共表达,是正常 Delta 样基因表达和 Notch 信号传导所必需的。我们还揭示了 Ascl1 在 Hes6 调节中的作用,Hes6 是一种促神经发生因子,可抑制 Notch 信号传导以促进神经分化而不是神经胶质分化。因此,这些结果表明了一种分子机制,即Notch水平减弱与祖细胞中原神经发生活性降低相结合,导致Ascl1缺陷型视网膜中胶质细胞生成增加和神经发生减少。
Delta gene expression in Drosophila is regulated by proneural bHLH transcription factors, such as acheate-scute. In vertebrates, multiple Delta-like and proneural bHLH genes are expressed during neurogenesis, especially in the retina. We recently uncovered a relationship between Acheate-scute like 1 (Ascl1), Delta-like genes, and Notch in chick retinal progenitors. Here, we report that mammalian retinal progenitors are also the primary source of Delta-like genes, likely signaling through Notch among themselves, while differentiating neurons expressed Jagged2. Ascl1 is co-expressed in Delta-like and Notch active progenitors, and required for normal Delta-like gene expression and Notch signaling. We also reveal a role for Ascl1 in the regulation of Hes6, a pro-neurogenic factor that inhibits Notch signaling to promote neural rather than glial differentiation. Thus, these results suggest a molecular mechanism whereby attenuated Notch levels coupled with reduced proneurogenic activity in progenitors leads to increased gliogenesis and decreased neurogenesis in the Ascl1 deficient retina.
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