X chromosome choice occurs independently of asynchronous replication timing.

X chromosome choice occurs independently of asynchronous replication timing.
复制标题

DOI:
10.1083/jcb.200405117
复制
发表时间:
2005-01-31
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Jaenisch R
Jaenisch R
中科院分区:
其他
文献类型:
--
作者:
Gribnau J;Luikenhuis S;Hochedlinger K;Monkhorst K;Jaenisch R

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在哺乳动物中,剂量补偿是通过雌性细胞中的X染色体失活来实现的。Xist是X失活所必需和足够的,Xist基因缺失导致完全偏斜的X失活。在这项工作中,我们分析了Xist缺失的小鼠中X失活的偏斜,该缺失包含启动子上游5 KB的序列,通过外显子3。我们发现,这种突变导致主要的非随机X染色体失活,其中野生型X染色体总是选择失活。为了了解影响选择的分子机制,我们分析了复制时机在X失活选择中的作用。我们发现,两个Xist等位基因和X染色体上测试的所有区域在X失活开始之前异步复制。然而,在细胞系与偏斜X失活的复制时间的分析表明,没有偏好的两个Xist等位基因之一,复制早期在S期发病前的X失活,表明异步复制时间不发挥作用,在偏斜的X失活。
In mammals, dosage compensation is achieved by X chromosome inactivation in female cells. Xist is required and sufficient for X inactivation, and Xist gene deletions result in completely skewed X inactivation. In this work, we analyzed skewing of X inactivation in mice with an Xist deletion encompassing sequence 5 KB upstream of the promoter through exon 3. We found that this mutation results in primary nonrandom X inactivation in which the wild-type X chromosome is always chosen for inactivation. To understand the molecular mechanisms that affect choice, we analyzed the role of replication timing in X inactivation choice. We found that the two Xist alleles and all regions tested on the X chromosome replicate asynchronously before the start of X inactivation. However, analysis of replication timing in cell lines with skewed X inactivation showed no preference for one of the two Xist alleles to replicate early in S-phase before the onset of X inactivation, indicating that asynchronous replication timing does not play a role in skewing of X inactivation.
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发表时间: 1998-08-01
影响因子: 2.6
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