由EZH2抑制引起的表观遗传变化会增加具有高AID活性或DNA修复缺陷的B细胞的转位
Jianli Tao1, Luca Alessandri1, Alessandro Gasparetto1
1Children Hospital Boston and Harvard Medical School, Boston, Massachusetts, United States.
作为B细胞淋巴瘤的单一疗法,EZH2抑制剂是安全的,但将其与PI3Kδ抑制剂结合使用会增加染色体转位风险. 这是因为EZH2抑制增强了敏感细胞中的AID活性和基因组不稳定性.
科学领域:
- 表观遗传学和癌症生物学
- 染色体转位和基因组不稳定性
- B细胞淋巴瘤的发病因子B细胞淋巴瘤的发病因子
背景情况:
- EZH2抑制剂 (tazemetostat,valemetostat) 已被批准用于卵泡淋巴瘤和成人T细胞白血病/淋巴瘤.
- 在毛囊淋巴瘤中,AID表达驱动突变特征和基因组不稳定性.
- EZH2抑制剂诱导B细胞的表观遗传和转录性变化.
研究的目的:
- 调查EZH2抑制剂是否会改变AID介导的染色体转位模式.
- 评估EZH2抑制剂作为单一治疗与联合治疗的安全性.
- 阐明EZH2抑制与转位形成之间的机制联系.
主要方法:
- 用EZH2抑制剂治疗小鼠CH12F3和人类MEC-1 B细胞 (单疗和与PI3Kδ抑制剂联合治疗).
- 评估AID表达和染色体转位频率.
- 分析基因素修饰 (H3K27me3,H3K27ac) 和DNA修复缺陷 (Ligase4缺陷) 的分析.
主要成果:
- 单独使用EZH2抑制剂并没有显著改变AID表达或转位频率.
- 与PI3Kδ抑制剂的联合治疗与单一治疗相比,显著增加了转位频率.
- 抑制EZH2增强了Ligase4缺乏细胞中的转位形成,并增加了H3K27ac,促进转位.
结论:
- EZH2抑制剂在B细胞中作为单一疗法是基因安全的.
- 与PI3Kδ抑制剂的联合治疗增加了基因组不稳定的风险.
- 通过EZH2抑制剂进行表观遗传调节会影响染色体转位风险,特别是在具有高AID或DNA修复缺陷的细胞中.
更多相关视频
11:06Genome-wide Analysis of HDAC Inhibitor-mediated Modulation of microRNAs and mRNAs in B Cells Induced to Undergo Class-switch DNA Recombination and Plasma Cell Differentiation
Published on: September 20, 2017
10:26Toxicological Assays for Testing Effects of an Epigenetic Drug on Development, Fecundity and Survivorship of Malaria Mosquitoes
Published on: January 16, 2015
相关概念视频
Epigenetic Regulation
X-chromosome...
Abnormal Proliferation
Chromatin Modification in iPS Cells
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal
Crossing Over
Nucleotide Excision Repair
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
