Highly asynchronous and asymmetric cleavage divisions accompany early transcriptional activity in pre-blastula medaka embryos.

Highly asynchronous and asymmetric cleavage divisions accompany early transcriptional activity in pre-blastula medaka embryos.
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DOI:
10.1371/journal.pone.0021741
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发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Schartl M
Schartl M
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Kraeussling M;Wagner TU;Schartl M

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在鱼类胚胎发育的初始阶段,一个突出和关键的事件是中囊胚转变(MBT)。在MBT之前,细胞周期是快速的,高度同步的,合子基因转录被关闭。只有在MBT期间,细胞周期去激活和转录被激活。多种机制,主要是核质比,应该控制MBT激活。出乎意料的是,我们发现在小硬骨鱼青(Oryzias latipes),在非常早期的阶段,早在midblastula,细胞分裂变得异步和细胞体积分歧。此外,合子转录在64细胞期后已经被广泛激活。因此,至少在青鳉中,从母体转录到合子转录的转变是从中胚阶段解耦的,而不仅仅是由核质比控制的。
In the initial phase of development of fish embryos, a prominent and critical event is the midblastula transition (MBT). Before MBT cell cycle is rapid, highly synchronous and zygotic gene transcription is turned off. Only during MBT the cell cycle desynchronizes and transcription is activated. Multiple mechanisms, primarily the nucleocytoplasmic ratio, are supposed to control MBT activation. Unexpectedly, we find in the small teleost fish medaka (Oryzias latipes) that at very early stages, well before midblastula, cell division becomes asynchronous and cell volumes diverge. Furthermore, zygotic transcription is extensively activated already after the 64-cell stage. Thus, at least in medaka, the transition from maternal to zygotic transcription is uncoupled from the midblastula stage and not solely controlled by the nucleocytoplasmic ratio.
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