The A-repeat links ASF/SF2-dependent Xist RNA processing with random choice during X inactivation.

The A-repeat links ASF/SF2-dependent Xist RNA processing with random choice during X inactivation.
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DOI:
10.1038/nsmb.1877
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发表时间:
2010-08
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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--
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在每个雌性哺乳动物细胞中,随机选择一条X染色体沉默。Xist编码一种非编码RNA,影响顺式连锁X染色体沉默的概率。我们发现,A-重复,Xist内的高度保守的元素,是必需的剪接Xist RNA的积累。此外,A重复序列是X失活随机发生所必需的。总之,我们的数据表明,正常的Xist RNA加工在随机X失活的调节中是重要的。我们建议,Xist RNA加工的调制可能是随机过程的一部分,决定哪些X染色体将被灭活。
One X chromosome, selected at random, is silenced in each female mammalian cell. Xist encodes a noncoding RNA that influences the probability that the cis-linked X chromosome will be silenced. We found that the A-repeat, a highly conserved element within Xist, is required for the accumulation of spliced Xist RNA. In addition, the A-repeat is necessary for X-inactivation to occur randomly. In combination, our data suggest that normal Xist RNA processing is important in the regulation of random X-inactivation. We propose that modulation of Xist RNA processing may be part of the stochastic process that determines which X chromosome will be inactivated.
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