Cohesin Smc1beta determines meiotic chromatin axis loop organization.

Cohesin Smc1beta determines meiotic chromatin axis loop organization.
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DOI:
10.1083/jcb.200706136
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发表时间:
2008-01-14
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Höög C
Höög C
中科院分区:
其他
文献类型:
--
作者:
Novak I;Wang H;Revenkova E;Jessberger R;Scherthan H;Höög C

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减数分裂染色体由蛋白质轴向结构组成,染色质环从中出现。虽然我们知道,环密度沿着减数分裂染色体轴是保守的生物体具有不同的基因组大小,染色质环的规则间距和他们的组织的基础是在很大程度上是未知的。我们使用两种小鼠模型系统,其中突变卵母细胞中的postreplicative减数分裂染色体轴比野生型卵母细胞更长或更短。我们观察到一个严格的相关性染色体轴的延伸和一般和相互缩短染色质环的大小。然而,在具有较短染色体轴的卵母细胞中,只有一部分染色质环延伸。我们发现,在具有较短或较长染色体轴的卵母细胞中观察到的染色质环大小的变化依赖于染色体1β(Smc 1 β)的结构维持,Smc 1 β是哺乳动物染色体相关减数分裂特异性粘附素。我们的研究结果表明,除了在姐妹染色单体凝聚中的作用,Smc 1 β决定减数分裂染色质环的组织。
Meiotic chromosomes consist of proteinaceous axial structures from which chromatin loops emerge. Although we know that loop density along the meiotic chromosome axis is conserved in organisms with different genome sizes, the basis for the regular spacing of chromatin loops and their organization is largely unknown. We use two mouse model systems in which the postreplicative meiotic chromosome axes in the mutant oocytes are either longer or shorter than in wild-type oocytes. We observe a strict correlation between chromosome axis extension and a general and reciprocal shortening of chromatin loop size. However, in oocytes with a shorter chromosome axis, only a subset of the chromatin loops is extended. We find that the changes in chromatin loop size observed in oocytes with shorter or longer chromosome axes depend on the structural maintenance of chromosomes 1β (Smc1β), a mammalian chromosome–associated meiosis-specific cohesin. Our results suggest that in addition to its role in sister chromatid cohesion, Smc1β determines meiotic chromatin loop organization.
DOI: 10.1128/mcb.21.20.6984-6998.2001
发表时间: 2001-10-01
影响因子: 5.3
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影响因子: 5.3
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