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端粒花束控制减数分裂纺锤体。

The telomere bouquet controls the meiotic spindle.

作者信息

Tomita Kazunori, Cooper Julia Promisel

机构信息

Telomere Biology Laboratory, Cancer Research UK, London WC2A 3PX, UK.

出版信息

Cell. 2007 Jul 13;130(1):113-26. doi: 10.1016/j.cell.2007.05.024.

Abstract

Bouquet formation, in which telomeres gather to a small region of the nuclear membrane in early meiosis, has been observed in diverse eukaryotes, but the function of the bouquet has remained a mystery. Here, we demonstrate that the telomere bouquet plays a crucial role in controlling the behavior of the fission yeast microtubule-organizing center (known as the spindle pole body or SPB) and the meiotic spindle. Using mutations that specifically disrupt the bouquet, we analyze chromosome, SPB, and spindle dynamics throughout meiosis. If the bouquet fails to form, the SPB becomes fragmented at meiosis I, leading to monopolar, multiple, and mislocalized spindles. Correct SPB and spindle behavior require not only the SPB recruitment of telomere proteins but also that the proteins are properly bound to telomeric DNA. This discovery illuminates an unanticipated level of communication between chromosomes and the spindle apparatus that may be widely conserved among eukaryotes.

摘要

在多种真核生物中都观察到了花束形成现象,即在减数分裂早期端粒聚集到核膜的一个小区域,但花束的功能一直是个谜。在这里,我们证明端粒花束在控制裂殖酵母微管组织中心(称为纺锤体极体或SPB)和减数分裂纺锤体的行为中起关键作用。利用特异性破坏花束的突变,我们分析了整个减数分裂过程中的染色体、SPB和纺锤体动态。如果花束未能形成,SPB在减数分裂I时会破碎,导致单极、多个和定位错误的纺锤体。正确的SPB和纺锤体行为不仅需要端粒蛋白被招募到SPB,还需要这些蛋白与端粒DNA正确结合。这一发现揭示了染色体与纺锤体装置之间一种意想不到的通讯水平,这种通讯可能在真核生物中广泛存在。

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