文章基本信息

标题：A multistep mechanism for the activation of rearrangement in the immune system
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作者：Yanhong Ji ; Jianmin Zhang ; Alfred Ian Lee 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2003
卷号：100
期号：13
页码：7557-7562
DOI：10.1073/pnas.0932635100
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Rearrangement of immune receptor loci is a developmentally controlled process that takes place exclusively in lymphoid cells. We have used a stable transfection system in pre-B cells to show that DNA methylation brings about histone underacetylation, histone H3(K9) methylation, DNaseI resistance, and strong inhibition of both transcription and recombination. Strikingly, this repression is maintained in dividing cells even after removal of the original methyl groups responsible for its establishment, but in this state, rearrangement can now be induced by reacetylation of local histones using the drug Trichostatin A. This same combination of demethylation and histone acetylation is also required to activate germline transcription and recombination from the endogenous {kappa} locus in vivo. These results indicate that the regulation of rearrangement is carried out by a multilayered synergistic process.