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Genetic Analysis of Myoblast Fusion: blown fuse Is Required for Progression Beyond the Prefusion Complex

机译:成肌细胞融合的遗传分析:超越融合前复合体需要使用熔断器进行融合

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摘要

The events of myoblast fusion in Drosophila are dissected here by combining genetic analysis with light and electron microscopy. We describe a new and essential intermediate step in the process, the formation of a prefusion complex consisting of “paired vesicles.” These pairs of vesicles from different cells align with each other across apposed plasma membranes. This prefusion complex resolves into dense membrane plaques between apposed cells; these cells then establish cytoplasmic continuity by fusion of small areas of plasma membrane followed by vesiculation of apposed membranes. Different steps in this process are specifically blocked by mutations in four genes required for myoblast fusion. One of these genes, blown fuse, encodes a novel cytoplasmic protein expressed in unfused myoblasts that is essential for progression beyond the prefusion complex stage.
机译:在果蝇中成肌细胞融合的事件在这里通过结合遗传学分析与光镜和电镜观察。我们描述了该过程中一个新的必不可少的中间步骤,即由“成对的囊泡”组成的预融合复合物的形成。来自不同细胞的这些成对的囊泡在并置的质膜上彼此对齐。这种融合前的复合物分解为并置细胞之间的致密膜斑。然后这些细胞通过融合小面积的质膜,然后囊泡对置的膜而建立细胞质的连续性。该过程中的不同步骤被成肌细胞融合所需的四个基因的突变特异地阻断。这些基因之一是熔丝,其编码在未融合的成肌细胞中表达的新型胞质蛋白,这对于超过融合前复杂阶段的进展至关重要。

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