在多发性骨髓瘤中甲基化变异性和LINE-1激活
Qianhui Wan1, Amy Leung1, Mahek Vinod Bhandari1
1Department of Diabetes Complications and Metabolism, Beckman Research Institute.
bioRxiv : the preprint server for biology
|August 8, 2025
概括
多发性骨髓瘤 (MM) 涉及表观遗传变化,包括DNA甲基化损失,激活LINE-1逆转移子. 这种激活与增加的细胞增殖和抑制KRAB-指蛋白 (KZFPS) 的表达减少相关.
科学领域:
- 血液瘤学 血液瘤学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 癌症基因组学 癌症基因组学
背景情况:
- 多发性骨髓瘤 (MM) 是一种血细胞癌,其特征是遗传突变和表观遗传改变.
- 恶性血细胞表现出全基因组DNA低甲基化和活性染色体标记的增加.
- 癌症中的表观遗传重塑可以导致沉默的可移植元素的重新激活,从而影响基因组调节.
研究的目的:
- 研究多发性骨髓瘤中DNA甲基化损失和可转移元素激活的作用.
- 描述MM的表观遗传变化,基因表达和细胞状态之间的关系.
- 确定与MM的表观遗传失调相关的潜在治疗点.
主要方法:
- 从患者获得的MM样本的配对表观基因组和转录基因组分析.
- 对DNA甲基化模式的分析,包括部分甲基化域.
- 量化LINE-1 (L1) 逆转移素活性和相关基因表达.
- 对KRAB-指蛋白 (KZFP) 丰度的评估.
主要成果:
- 在MM中DNA甲基化损失会产生患者可变的部分甲基化域.
- 这种低甲基化与数百个LINE-1 (L1) 逆转录素驱动的转录物的表达相关.
- 由L1活动分层的MM样本显示出明显的基因表达特征,高L1活性与增殖和抑制的免疫通路有关.
- 在高L1活性的MM样本中观察到异常低的KRAB-指蛋白 (KZFPS).
结论:
- 多发性骨髓瘤中的细胞增殖与KZFP表达的丧失和随后的L1元素的激活有关.
- L1激活可以通过各种机制,包括瘤基因转录,促进MM的恶性表型.
- 表观遗传失调,特别是L1的重新激活,代表了MM研究和治疗的潜在途径.
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