Local Gurken signaling and dynamic MAPK activation during Drosophila oogenesis

Local Gurken signaling and dynamic MAPK activation during Drosophila oogenesis
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果蝇卵子发生过程中的局部 Gurken 信号传导和动态 MAPK 激活

DOI:
10.1016/s0925-4773(98)00228-7
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发表时间:
1999
影响因子:
2.6
通讯作者:
S. Roth
S. Roth
中科院分区:
生物学4区
文献类型:
--
作者:
F. Peri;Christian Bökel;S. Roth

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在果蝇卵子发生过程中,靠近卵母核的转化生长因子-α样蛋白通过果蝇表皮生长因子受体(DER)激活MAPK级联反应。这一途径的激活诱导了覆盖毛囊上皮的不同细胞命运,指定了两个背侧定位的呼吸附件和分隔它们的最背侧细胞。信号相关的Gurken蛋白内化到卵泡细胞表明,Gurken信号在卵子发生中期是空间受限的,并且强度恒定。与此同时,MAPK的激活在空间和时间上以动态的方式演变,并分解成一种复杂的模式,预示着附件的位置。因此,背部毛囊细胞的不同命运并不是由不同的形态原梯度决定的。相反,它们是由次级信号放大和细化过程指定的,这些过程将Gurken信号与DER途径的目标基因产生的正反馈和负反馈机制整合在一起。
During Drosophila melanogaster oogenesis Gurken, a TGF-α like protein localized close to the oocyte nucleus, activates the MAPK cascade via the Drosophila EGF receptor (DER). Activation of this pathway induces different cell fates in the overlying follicular epithelium, specifying the two dorsolaterally positioned respiratory appendages and the dorsalmost cells separating them. Signal-associated internalization of Gurken protein into follicle cells demonstrates that the Gurken signal is spatially restricted and of constant intensity during mid-oogenesis. At the same time MAPK activation evolves in a spatially and temporally dynamic way and resolves into a complex pattern that presages the position of the appendages. Therefore, different dorsal follicle cell fates are not determined by a Gurken morphogen gradient. Instead they are specified by secondary signal amplification and refinement processes that integrate the Gurken signal with positive and negative feedback mechanisms generated by target genes of the DER pathway.
果蝇背腹轴的形成取决于 gurken 基因的正确剂量。
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