B细胞超强增强剂和调控集群招募AID瘤原性活动
Jason Qian1, Qiao Wang2, Marei Dose1
1Genomics and Immunity, NIAMS, NIH, Bethesda, MD 20892, USA.
Cell
|December 9, 2014
概括
抗体基因突变体,激活诱导的胺酶 (AID),针对超级增强剂内的瘤基因,而不是随机. 这些3D连接的监管区域合作招募AID,推动瘤发生.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 癌症生物学 癌症生物学
背景情况:
- 激活诱导的cytidine deaminase (AID) 对于抗体多样化至关重要,但也会导致瘤基因突变和瘤发生.
- 对于非免疫球蛋白位点对AID活性的敏感性仍然不太清楚.
- 核架构和B细胞规基因组背景与AID的非目标效应有关.
研究的目的:
- 调查AID目标的基因组分布和监管背景.
- 了解核组织如何影响艾滋病介导的DNA损伤.
- 阐明AID对非免疫球蛋白基因的招募机制.
主要方法:
- 在核架构和B细胞规律的背景下对AID目标的分析.
- 基因组编辑研究3D链接目标在AID招募中的作用.
- 在不同细胞类型 (老鼠B细胞,人类淋巴瘤,MEFs) 中对AID诱导的突变进行比较分析.
主要成果:
- 援助援助目标不是随机分布的,而是集中在超级增强者和监管集群中.
- 在这些域内,AID会去除活跃促进子和eRNA ((+) 增强子,这些增强子可以在很长的基因组距离内相互连接.
- 3D连接的目标合作招募AID介导的休息,突出了核组织的作用.
- 艾滋病针对不同细胞类型的不同基因,但这些目标始终与复杂的,高度转录的超级增强剂有关.
结论:
- 超级增强剂和调控区是对特定基因组位置的AID招募的关键调解者.
- 核架构和3D基因组组织在指导AID活动和随后的瘤发生方面发挥着关键作用.
- 了解AID在这些监管中心中的准机制对于制定癌症预防和治疗策略至关重要.
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