Integral bHLH factor regulation of cell cycle exit and RGC differentiation.

Integral bHLH factor regulation of cell cycle exit and RGC differentiation.
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DOI:
10.1002/dvdy.24638
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发表时间:
2018-08
期刊:
Developmental dynamics : an official publication of the American Association of Anatomists
影响因子:
--
通讯作者:
Brown NL
Brown NL
中科院分区:
其他
文献类型:
--
作者:
Maurer KA;Kowalchuk A;Shoja-Taheri F;Brown NL

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在发育中的小鼠胚胎中,bHLH转录因子Neurog2由视网膜前体细胞瞬时表达,是神经发生的初始波所必需的。值得注意的是,另一种bHLH因子Ascl1,通常不存在于胚胎Neurog2视网膜谱系中,可以挽救Neurog2突变体的时间表型。在这里,我们使用有丝分裂窗标记并将这些结果与视网膜标记物定量相结合,表明Neurog2同时促进了细胞周期末期退出和视网膜神经节细胞的分化。我们还分析了Neurog2GFP/+、Neurog2GFP/GFP和Neurog2Ascl1KI/GFP眼的E12.5 GFP表达细胞的转录,并用qPCR方法验证了受影响最显著的基因。我们的数据支持这样的假设,即Neurog2在视网膜bHLH转录因子层次结构的顶端发挥作用。这些下游因子的联合表达水平足以被异位Ascl1诱导以恢复RGC的发生,突显了该基因网络在视网膜神经节细胞神经发生中的健壮性。
In the developing mouse embryo, the bHLH transcription factor Neurog2 is transiently expressed by retinal progenitor cells and required for the initial wave of neurogenesis. Remarkably, another bHLH factor, Ascl1, normally not present in the embryonic Neurog2 retinal lineage, can rescue the temporal phenotypes of Neurog2 mutants. Here we show that Neurog2 simultaneously promotes terminal cell cycle exit and retinal ganglion cell differentiation, using mitotic window labeling and integrating these results with retinal marker quantifications. We also analyzed the transcriptomes of E12.5 GFP-expressing cells from Neurog2GFP/+, Neurog2GFP/GFP, and Neurog2Ascl1KI/GFP eyes, and validated the most significantly affected genes using qPCR assays. Our data support the hypothesis that Neurog2 acts at the top of a retinal bHLH transcription factor hierarchy. The combined expression levels of these downstream factors are sufficiently induced by ectopic Ascl1 to restore RGC genesis, highlighting the robustness of this gene network during retinal ganglion cell neurogenesis.
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