由染色体结合PHD指的失调引起的造血性恶性瘤
Gang G Wang1, Jikui Song, Zhanxin Wang
1Laboratory of Chromatin Biology & Epigenetics, The Rockefeller University, New York, New York 10065, USA.
Nature
|May 12, 2009
概括
涉及PHD手指的融合蛋白与H3K4me3 / 2标记结合,通过阻止造血分化来驱动瘤发生. 这些NUP98-PHD融合将关键基因锁定在活跃状态,导致急性髓性白血病.
科学领域:
- 表观遗传学和基因调控
- 癌症生物学 癌症生物学
- 血液形成 血液形成 血液形成
背景情况:
- 基因表达和细胞特征的基因表达和细胞特征中,素H3 lysine 4甲基化 (H3K4me) 是至关重要的.
- 植物宿主群 (PHD) 的手指解释H3K4me状态,它们的失调与癌症等疾病有关.
- 核蛋白-98 (NUP98) 融合与人类白血病有关.
研究的目的:
- 为了研究H3K4me结合PHD手指与NUP98融合在瘤发生中的作用.
- 阐明NUP98-PHD融合诱导急性髓性白血病的机制.
- 确定H3K4me3结合对于白血病转变的必要性.
主要方法:
- 在小鼠模型中生成NUP98-PHD融合蛋白.
- 血液形成分化和白血病转变的评估.
- 分析H3K4me3标记在特定基因位置的基因位置.
- 对PHD手指的突变分析,以评估H3K4me3结合和白血病产生潜力.
主要成果:
- 含有H3K4me3/2-结合PHD指的NUP98-PHD融合在小鼠中强烈诱导了急性髓性白血病.
- 破坏H3K4me3结合的突变取消了白血病转化.
- 融合防止了与分化相关的H3K4me3去除,保持了关键发育基因的活跃转录.
- NUP98-PHD融合作为染色体边界因子,覆盖沉默和锁定位点在活跃状态.
结论:
- 通过NUP98融合放松PHD手指功能的调节是瘤发生的一个新机制.
- PHD手指对H3K4me3的特定结合对于白血病转化至关重要.
- NUP98-PHD融合破坏了表观遗传动力学,导致异常的细胞命运和白血病的发展.
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