Serial specification of diverse neuroblast identities from a neurogenic placode by Notch and Egfr signaling.
Serial specification of diverse neuroblast identities from a neurogenic placode by Notch and Egfr signaling.
复制标题
Notch和EGFR信号传导来自神经源性位置的不同神经细胞身份的序列规范。
DOI:
10.1242/dev.055681
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发表时间:
2011-07
期刊:
影响因子:
--
通讯作者:
Rulifson E
中科院分区:
文献类型:
--
作者:
Hwang HJ;Rulifson E
We used the brain insulin-producing cell (IPC) lineage and its identified neuroblast (IPC NB) as a model to understand a novel example of serial specification of NB identities in the Drosophila dorsomedial protocerebral neuroectoderm. The IPC NB was specified from a small, molecularly identified group of cells comprising an invaginated epithelial placode. By progressive delamination of cells, the placode generated a series of NB identities, including the single IPC NB, a number of other canonical Type I NBs, and a single Type II NB that generates large lineages by transient amplification of neural progenitor cells. Loss of Notch function caused all cells of the placode to form as supernumerary IPC NBs, indicating that the placode is initially a fate equivalence group for the IPC NB fate. Loss of Egfr function caused all placodal cells to apoptose, except for the IPC NB, indicating a requirement of Egfr signaling for specification of alternative NB identities. Indeed, both derepressed Egfr activity in yan mutants and ectopic EGF activity produced supernumerary Type II NBs from the placode. Loss of both Notch and Egfr function caused all placode cells to become IPC NBs and survive, indicating that commitment to NB fate nullified the requirement of Egfr activity for placode cell survival. We discuss the surprising parallels between the serial specification of neural fates from this neurogenic placode and the fly retina.
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