Jagunal is required for reorganizing the endoplasmic reticulum during Drosophila oogenesis.

Jagunal is required for reorganizing the endoplasmic reticulum during Drosophila oogenesis.
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在果蝇卵子发生过程中,jagunal是重组内质网所必需的。

DOI:
10.1083/jcb.200701048
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发表时间:
2007-03-26
影响因子:
7.8
通讯作者:
Cooley, Lynn
Cooley, Lynn
中科院分区:
生物学1区
文献类型:
--
作者:
Lee, Sangil;Cooley, Lynn

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果蝇卵母细胞中的囊泡运输在卵黄发生过程中活跃发生。尽管卵母细胞的内吞作用已得到很好的表征,但胞吐囊泡的运输尚不清楚。我们发现卵母细胞内质网(ER)在卵黄发生过程中集中到皮质下簇中。这种内质网重组需要 Jagunal,它是一种进化上保守的内质网膜蛋白。 Jagunal 的缺失减少了卵母细胞侧膜的囊泡运输,但不影响后极化囊泡运输,表明 Jagunal 在促进皮层下囊泡运输中发挥作用。 Jagunal 损失导致膜流量减少,影响卵母细胞和刚毛生长。我们认为内质网重组是细胞为膜运输需求增加做好准备的重要机制,而 Jagunal 通过内质网聚类促进了这一过程。
Vesicular traffic in the Drosophila melanogaster oocyte occurs actively during vitellogenesis. Although endocytosis in the oocyte has been well characterized, exocytic vesicular traffic is less well understood. We show that the oocyte endoplasmic reticulum (ER) becomes concentrated into subcortical clusters during vitellogenesis. This ER reorganization requires Jagunal, which is an evolutionarily conserved ER membrane protein. Loss of Jagunal reduces vesicular traffic to the oocyte lateral membrane, but does not affect posterior polarized vesicular traffic, suggesting a role for Jagunal in facilitating vesicular traffic in the subcortex. Reduced membrane traffic caused by loss of Jagunal affects oocyte and bristle growth. We propose that ER reorganization is an important mechanism used by cells to prepare for an increased demand for membrane traffic, and Jagunal facilitates this process through ER clustering.
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