Cytoplasmic streaming drifts the polarity cue and specifies the cell polarity in Caenorhabditis elegans zygotes

Cytoplasmic streaming drifts the polarity cue and specifies the cell polarity in Caenorhabditis elegans zygotes
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细胞质流漂移极性提示并指定秀丽隐杆线虫受精卵的细胞极性

DOI:
10.1101/2019.12.23.887620
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发表时间:
2019
期刊:
bioRxiv
影响因子:
--
通讯作者:
Kimura Akatsuki
Kimura Akatsuki
中科院分区:
--
文献类型:
--
作者:
Kimura Kenji;Kimura Akatsuki

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在发育过程中,需要细胞极化来确定体轴。极化的空间线索的位置对于引导身体轴是至关重要的。在秀丽隐杆线虫受精卵中,精子来源的原核/中心体复合体(SPCC)作为空间线索来指定前后轴。受精后大约30分钟,细胞皮层的收缩性在SPCC附近放松,这是极化的最早迹象,称为对称性破缺(SB)。目前还不清楚SPCC在SB中的位置是如何在受精后确定的。在这里,我们表明,SPCC漂移动态地通过细胞的细胞质,称为减数分裂细胞质流的流动。这种流动偶尔会带来SPCC到对面的精子进入网站之前SB。我们的研究结果表明,细胞质流决定随机的位置的空间线索的身体轴,即使在一个有机体像C。elegans优雅for which哪一个development发展is stereotyped定型.
Cell polarisation is required to define body axes during development. The position of spatial cues for polarisation is critical to direct the body axes. InCaenorhabditis eleganszygotes, the sperm-derived pronucleus/centrosome complex (SPCC) serves as the spatial cue to specify the anterior–posterior axis. Approximately 30 minutes after fertilisation, the contractility of the cell cortex is relaxed near the SPCC, which is the earliest sign of polarisation and called symmetry breaking (SB). It is unclear how the position of SPCC at SB is determined after fertilisation. Here, we show that SPCC drifts dynamically through the cell-wide flow of the cytoplasm, called meiotic cytoplasmic streaming. This flow occasionally brings SPCC to the opposite side of the sperm entry site before SB. Our results demonstrate that cytoplasmic flow determines stochastically the position of the spatial cue of the body axis, even in an organism likeC. elegansfor which development is stereotyped.
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