Symmetry breaking in the female germline cyst.

Symmetry breaking in the female germline cyst.
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DOI:
10.1126/science.abj3125
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发表时间:
2021-11-12
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
St Johnston D
St Johnston D
中科院分区:
其他
文献类型:
--
作者:
Nashchekin D;Busby L;Jakobs M;Squires I;St Johnston D

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在哺乳动物和苍蝇中,多细胞雌性种系囊肿中只有一个细胞成为卵母细胞,但如何打破对称以选择卵母细胞尚不清楚。本研究表明,微管负端稳定蛋白Patronin/CAMSAP标志着未来的果蝇卵母细胞,并且是卵母细胞规范所必需的。波谱图,Shot,将Patronin招募到梭体,一个延伸到所有囊肿细胞的分支结构。光顾蛋白稳定了细胞中更多的微管。我们的数据表明,这种弱不对称性被动力蛋白依赖的patron稳定微管运输放大。这形成了一个极化的微管网络,动力蛋白沿着这个微管网络将卵母细胞决定因子转运到假定的卵母细胞中。因此,光顾蛋白放大了弱的融合体各向异性,打破了对称性,选择了一个细胞成为卵母细胞。
In mammals and flies, only one cell in a multicellular female germline cyst becomes an oocyte, but how symmetry is broken to select the oocyte is unknown. Here we show that the microtubule minus end-stabilizing protein, Patronin/CAMSAP marks the future Drosophila oocyte and is required for oocyte specification. The spectraplakin, Shot, recruits Patronin to the fusome, a branched structure extending into all cyst cells. Patronin stabilizes more microtubules in the cell with most fusome. Our data suggest that this weak asymmetry is amplified by Dynein-dependent transport of Patronin-stabilized microtubules. This forms a polarized microtubule network, along which Dynein transports oocyte determinants into the presumptive oocyte. Thus, Patronin amplifies a weak fusome anisotropy to break symmetry and select one cell to become the oocyte.
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