Cytoskeletal forces span the nuclear envelope to coordinate meiotic chromosome pairing and synapsis.

Cytoskeletal forces span the nuclear envelope to coordinate meiotic chromosome pairing and synapsis.
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DOI:
10.1016/j.cell.2009.10.039
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发表时间:
2009-11-25
期刊:
影响因子:
64.5
通讯作者:
Dernburg AF
Dernburg AF
中科院分区:
生物学1区
文献类型:
--
作者:
Sato A;Isaac B;Phillips CM;Rillo R;Carlton PM;Wynne DJ;Kasad RA;Dernburg AF

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有性生殖需要独特的细胞分裂称为减数分裂,其中二倍体细胞经历减数分裂以产生单倍体配子。减数分裂前期的一个标志是同源染色体之间形成成对的连锁,随后使它们能够彼此分离。在大多数生物体中,同源染色体的配对通过联会来加强,联会复合体(SC)在成对的染色体轴之间聚合。这里要解决的主要问题是:1)配对是如何完成的,2)突触是如何调节的,以便它选择性地发生在同源物之间。我们提供的证据表明,染色体和微管细胞骨架之间的连接,通过一个跨核膜的桥梁是至关重要的这两种机制。我们的研究结果表明,存在一种机制,使用动力蛋白,以评估同源性许可SC聚合之前。从真菌到哺乳动物,这种机制的分子组成都是保守的。
Sexual reproduction requires the unique cell division called meiosis, in which a diploid cell undergoes a reductional division to generate haploid gametes. A hallmark of meiotic prophase is the formation of pairwise linkages between homologous chromosomes, which later enable them to segregate from each other. In most organisms the pairing of homologous chromosomes is reinforced by synapsis, the polymerization of the synaptonemal complex (SC) between paired chromosome axes. The primary questions addressed here are: 1) how pairing is accomplished and 2) how synapsis is regulated so that it occurs selectively between homologs. We provide evidence that a connection between the chromosomes and the microtubule cytoskeleton via a bridge across the nuclear envelope is critical for both of these mechanisms. Our results indicate the existence of a mechanism that uses dynein to assess homology before licensing SC polymerization. The molecular components of this mechanism are conserved from fungi to mammals.
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