一个Myc增强剂集群调节正常和白血病造血干细胞等级
Carsten Bahr1,2,3, Lisa von Paleske1,2,3, Veli V Uslu4
1Division of Stem Cells and Cancer, German Cancer Research Center (DKFZ) and DKFZ-ZMBH Alliance, Im Neuenheimer Feld 280, 69120 Heidelberg, Germany.
Nature
|January 18, 2018
概括
一个控制Myc基因表达的关键调控区域,称为血液增强器集群 (BENC),对正常的血细胞发育和骨髓性白血病的维持至关重要. 它的失调会影响干细胞功能和疾病的进展.
科学领域:
- * 分子生物学
- * 血液学
- * 癌症生物学
背景情况:
- * 转录因子Myc对造血干细胞 (HSC) 和前代细胞至关重要,并与血液癌症有关.
- 在Myc的下游,一个保存的"超级增强器"区域调节了它的表达.
- * 了解Myc调节对于HSC功能和白血病治疗至关重要.
研究的目的:
- * 调查下游"超级增强剂"在调节Myc表达中的功能.
- * 确定该调节区域在正常血液形成和白血病中的作用.
- * 探索该区域在人类白血病中的潜在治疗向.
主要方法:
- * 用小鼠模型进行基因删除研究,以评估Myc表达和血液形成表型.
- * 增强器模块和转录因子招募的分析.
- * 在人类急性髓性白血病 (AML) 细胞中测定染色质可达性.
主要成果:
- * 删除"超级增强剂"区域消除了小鼠HSC和祖先的Myc表达,导致发育缺陷.
- 这一区域被称为"血液增强剂集群" (BENC),包括多个控制Myc水平的模块.
- * BENC对MLL- AF9驱动的小鼠白血病至关重要,在人类AML干细胞中显示出改变的可访问性,与MYC表达和患者的结果相关.
结论:
- * 血液增强剂集群 (BENC) 通过组合增强剂活性精确控制Myc的表达.
- * BENC对于正常的造血和白血病干细胞的维持都至关重要.
- * BENC的失调有助于白血病发生,可能是人类AML的治疗点.
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