Dual roles of Incenp crucial to the assembly of the acentrosomal metaphase spindle in female meiosis.

Dual roles of Incenp crucial to the assembly of the acentrosomal metaphase spindle in female meiosis.
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incenp对女性减数分裂中腺体中层轴心轴的组装至关重要的双重作用至关重要。

DOI:
10.1242/dev.022624
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发表时间:
2008-10
期刊:
影响因子:
4.6
通讯作者:
Ohkura, Hiroyuki
Ohkura, Hiroyuki
中科院分区:
生物学2区
文献类型:
--
作者:
Colombie, Nathalie;Cullen, C. Fiona;Brittle, Amy L.;Jang, Janet K.;Earnshaw, William C.;Carmena, Mar;Mckim, Kim;Ohkura, Hiroyuki

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雌性减数分裂中的纺锤体形成与许多动物的有丝分裂不同,因为它独立于中心体发生,并且该途径的分子要求仍有待了解。本研究报告了染色体乘客复合体(Aurora B复合体)的重要亚基Incenp在果蝇雌性减数分裂中中心体独立纺锤体形成中的两个关键作用。首先,在突变体中纺锤体微管的初始组装被大大延迟。这清楚地表明,这是第一次,在染色体驱动纺锤体微管组装在活卵母细胞中的关键作用。此外,与有丝分裂不同,在有丝分裂中,有丝分裂的等效功能在后期开始后变得突出,而在中期I纺锤体的赤道区域稳定则是必要的。我们的分析表明,激酶-6蛋白Subito与Incenp合作完成后一种功能,而不是微管组装。我们认为这两种功能是弥补减数分裂纺锤体形成过程中中心体缺失的机制的一部分。
Spindle formation in female meiosis differs from mitosis in many animals, as it takes place independently from centrosomes, and the molecular requirements of this pathway remain to be understood. Here we report two crucial roles of Incenp, an essential subunit of the chromosomal passenger complex (the Aurora B complex), in centrosome-independent spindle formation in Drosophila female meiosis. Firstly, the initial assembly of spindle microtubules is drastically delayed in an incenp mutant. This clearly demonstrates, for the first time, a crucial role for Incenp in chromosome-driven spindle microtubule assembly in living oocytes. Additionally, Incenp is necessary to stabilise the equatorial region of the metaphase I spindle, in contrast to mitosis, where the equivalent function becomes prominent after anaphase onset. Our analysis suggests that Subito, a kinesin-6 protein, cooperates with Incenp for this latter function, but not microtubule assembly. We propose that the two functions of Incenp are part of the mechanisms that compensate for the lack of centrosomes during meiotic spindle formation.
DOI: 10.1083/jcb.153.4.865
发表时间: 2001-05-14
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