Bqt2p is essential for initiating telomere clustering upon pheromone sensing in fission yeast.

Bqt2p is essential for initiating telomere clustering upon pheromone sensing in fission yeast.
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DOI:
10.1083/jcb.200602152
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发表时间:
2006-06-19
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Cande WZ
Cande WZ
中科院分区:
其他
文献类型:
--
作者:
Tang X;Jin Y;Cande WZ

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端粒花束,即,在减数分裂前期,端粒聚集在核膜上,被认为促进同源染色体配对。使用视觉屏幕,我们确定了bqt 2/im 295,一个突变体,破坏分裂酵母端粒聚类。Bqt 2 p是连接端粒的减数分裂纺锤体极体(SPB),但不为附件的端粒或SPB的NE所需。Bqt 2 p在信息素感测后表达,并随后共定位于Sad 1 p,SPB蛋白。这种定位仅依赖于Bqt 1 p,而不依赖于端粒聚集所需的其他已鉴定蛋白。在信息素传感,生成的Sad 1 p焦点旁边的端粒取决于Bqt 2 p。然而,在减数分裂前期结束时,从SPB中消耗Bqt 2 p对于溶解端粒花束是不利的。因此,端粒花束的形成需要Bqt 2 p作为连接组件,并在减数分裂进程中进行精细调控。
The telomere bouquet, i.e., telomere clustering on the nuclear envelope (NE) during meiotic prophase, is thought to promote homologous chromosome pairing. Using a visual screen, we identified bqt2/im295, a mutant that disrupts telomere clustering in fission yeast. Bqt2p is required for linking telomeres to the meiotic spindle pole body (SPB) but not for attachment of telomeres or the SPB to the NE. Bqt2p is expressed upon pheromone sensing and colocalizes thereafter to Sad1p, an SPB protein. This localization only depends on Bqt1p, not on other identified proteins required for telomere clustering. Upon pheromone sensing, generation of Sad1p foci next to telomeres depends on Bqt2p. However, depletion of Bqt2p from the SPB is dispensable for dissolving the telomere bouquet at the end of meiotic prophase. Therefore, telomere bouquet formation requires Bqt2p as a linking component and is finely regulated during meiotic progression.
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