在B细胞淋巴瘤中,超增强剂高突变改变了瘤基因表达
Elodie Bal1, Rahul Kumar1,2, Mohammad Hadigol3
1Institute for Cancer Genetics, Columbia University, New York, NY, USA.
Nature
|July 6, 2022
概括
扩散性大B细胞淋巴瘤 (DLBCL) 涉及超级增强剂的突变,对基因调节至关重要. 这些突变会影响BCL6,BCL2和CXCR4等基因,为这种常见的非霍奇金淋巴瘤提供新的治疗点.
科学领域:
- 基因组学
- 癌症生物学
- 血液学
背景情况:
- 扩散性大B细胞淋巴瘤 (DLBCL) 是最常见的B细胞非霍奇金淋巴瘤,大约40%的患者仍然无法治愈.
- 虽然DLBCL的编码基因组已被广泛研究,但非编码基因组仍然在很大程度上未被探索.
- 鉴定新的基因变异和治疗点对于改善DLBCL治疗结果至关重要.
研究的目的:
- 研究非编码基因组,特别是超级增强剂在DLBCL病变发生中的作用.
- 确定超级增强剂是否在DLBCL中发生变化,以及这些变化是否具有功能后果.
- 在DLBCL的非编码基因组中识别潜在的新治疗点.
主要方法:
- 使用全基因组测序对DLBCL患者样本中的活性超强剂进行分析.
- 对突变特征的评估,包括激活诱导的cytidine deaminase活动.
- 功能性研究评估超增强基因突变对基因调节和瘤基因表达的影响.
- 对突变进行基因校正以评估致癌性依赖性.
主要成果:
- 在92%的DLBCL样本中,活性超级增强剂具有特异性和高度突变.
- 这些超突变超增强剂显示激活诱导的cytidine deaminase活动的特征.
- 与BCL6,BCL2和CXCR4相关的超级增强剂的突变阻止了转录抑制剂的结合,导致瘤基因的上调.
- 这些突变的基因纠正恢复了抑制剂结合,降低了目标基因的调节,并导致突变的等位基因的反选择,表明了瘤性依赖.
结论:
- 一个普遍的超级增强剂突变机制通过调节基因表达来促进DLBCL的发病.
- 这些发现扩大了已知瘤基因在DLBCL中的参与,并确定了新的放松基因标.
- 超增强基因突变是DLBCL的一个重要的基因病变类别,具有潜在的治疗意义.
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