Abdominal-B and caudal inhibit the formation of specific neuroblasts in the Drosophila tail region.

Abdominal-B and caudal inhibit the formation of specific neuroblasts in the Drosophila tail region.
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DOI:
10.1242/dev.096099
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发表时间:
2013-09
期刊:
Development (Cambridge, England)
影响因子:
--
通讯作者:
Technau GM
Technau GM
中科院分区:
其他
文献类型:
--
作者:
Birkholz O;Vef O;Rogulja-Ortmann A;Berger C;Technau GM

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黑腹果蝇的中枢神经系统由融合的节段单位(神经粒)组成,每个节段单位由特定数量的神经干细胞(神经母细胞)产生。在胚胎中,胸神经粒和腹前神经粒大小几乎相同,由重复的神经母细胞形成,而腹末梢神经粒则由明显较小的祖细胞群产生。在这里,我们研究了Hox基因腹部- b在末梢神经粒形成中的作用。我们发现,abdm - b (Abd-B.r)的调节异构体不仅赋予特定的神经母细胞腹部命运(如NB6-4),并调节14准段中某些神经母细胞谱系(如NB3-3)中几个子代细胞的程序性细胞死亡,而且还抑制15准段中一组特定神经母细胞的形成(包括NB7-3)。我们进一步证明了d- b。r需要副hox尾侧基因的合作,以展现其在神经母细胞抑制和规范方面的全部能力。因此,我们的研究结果表明,腹侧- b和尾侧的联合作用通过调节特定神经母细胞的数量和谱系来影响末梢神经粒的大小和组成。
The central nervous system of Drosophila melanogaster consists of fused segmental units (neuromeres), each generated by a characteristic number of neural stem cells (neuroblasts). In the embryo, thoracic and anterior abdominal neuromeres are almost equally sized and formed by repetitive sets of neuroblasts, whereas the terminal abdominal neuromeres are generated by significantly smaller populations of progenitor cells. Here we investigated the role of the Hox gene Abdominal-B in shaping the terminal neuromeres. We show that the regulatory isoform of Abdominal-B (Abd-B.r) not only confers abdominal fate to specific neuroblasts (e.g. NB6-4) and regulates programmed cell death of several progeny cells within certain neuroblast lineages (e.g. NB3-3) in parasegment 14, but also inhibits the formation of a specific set of neuroblasts in parasegment 15 (including NB7-3). We further show that Abd-B.r requires cooperation of the ParaHox gene caudal to unfold its full competence concerning neuroblast inhibition and specification. Thus, our findings demonstrate that combined action of Abdominal-B and caudal contributes to the size and composition of the terminal neuromeres by regulating both the number and lineages of specific neuroblasts.
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