S region sequence, RNA polymerase II, and histone modifications create chromatin accessibility during class switch recombination.
S region sequence, RNA polymerase II, and histone modifications create chromatin accessibility during class switch recombination.
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S 区序列、RNA 聚合酶 II 和组蛋白修饰在类别转换重组过程中创建染色质可及性。
DOI:
10.1084/jem.20081678
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
Kenter,AmyL
中科院分区:
文献类型:
--
作者:
Wang,Lili;Wuerffel,Robert;Feldman,Scott;Khamlichi,AhmedAmine;Kenter,AmyL
Immunoglobulin class switch recombination is governed by long-range interactions between enhancers and germline transcript promoters to activate transcription and modulate chromatin accessibility to activation-induced cytidine deaminase (AID). However, mechanisms leading to the differential targeting of AID to switch (S) regions but not to constant (CH) regions remain unclear. We show that S and CHregions are dynamically modified with histone marks that are associated with active and repressed chromatin states, respectively. Chromatin accessibility is superimposable with the activating histone modifications, which extend throughout S regions irrespective of length. High density elongating RNA polymerase II (RNAP II) is detected in S regions, suggesting that the transcription machinery has paused and stalling is abolished by deletion of the S region. We propose that RNAP II enrichment facilitates recruitment of histone modifiers to generate accessibility. Thus, the histone methylation pattern produced by transcription localizes accessible chromatin to S regions, thereby focusing AID attack.
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