X chromosome choice occurs independently of asynchronous replication timing.
X chromosome choice occurs independently of asynchronous replication timing.
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DOI:
10.1083/jcb.200405117
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发表时间:
2005-01-31
期刊:
影响因子:
--
通讯作者:
Jaenisch R
中科院分区:
文献类型:
--
作者:
Gribnau J;Luikenhuis S;Hochedlinger K;Monkhorst K;Jaenisch R
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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