Rsx is a metatherian RNA with Xist-like properties in X-chromosome inactivation.
Rsx is a metatherian RNA with Xist-like properties in X-chromosome inactivation.
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DOI:
10.1038/nature11171
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发表时间:
2012-07-12
期刊:
影响因子:
64.8
通讯作者:
Turner, James M. A.
中科院分区:
文献类型:
--
作者:
Grant, Jennifer;Mahadevaiah, Shantha K.;Khil, Pavel;Sangrithi, Mahesh N.;Royo, Helene;Duckworth, Janine;McCarrey, John R.;VandeBerg, John L.;Renfree, Marilyn B.;Taylor, Willie;Elgar, Greg;Camerini-Otero, R. Daniel;Gilchrist, Mike J.;Turner, James M. A.
In female (XX) mammals one of the two X chromosomes is inactivated to ensure an equal dose of X-linked genes with males (XY). X-inactivation in eutherian mammals is mediated by the non-coding RNA Xist. Xist is not found in metatherians and how X-inactivation is initiated in these mammals has been the subject of speculation for decades. Using the marsupial Monodelphis domestica we identify Rsx (RNA-on-the-silent X), an RNA that exhibits properties consistent with a role in X-inactivation. Rsx is a large, repeat-rich RNA that is expressed only in females and is transcribed from, and coats, the inactive X chromosome. In female germ cells, where both X chromosomes are active, Rsx is silenced, linking Rsx expression to X-inactivation and reactivation. Integration of an Rsx transgene on an autosome in mouse embryonic stem cells leads to gene silencing in cis. Our findings permit comparative studies of X-inactivation in mammals and pose questions about the mechanisms by which X-inactivation is achieved in eutherians.
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