在RUNX1::RUNX1T1急性髓性白血病中合作MGA突变的功能性表征:RUNX1T1急性髓性白血病
Jeffery Klco1, Melvin Thomas1, Wenqing Qi1
1St. Jude Children's Research Hospital.
Research square
|October 4, 2023
概括
马克斯基因相关 (MGA) 通常会抑制细胞生长. 血液细胞中MGA的损失促进了细胞的增殖,并与RUNX1::RUNX1T1合作,加速急性髓性白血病的发展.
科学领域:
- 血液学 血液学 血液学
- 分子生物学分子生物学
- 癌症研究 癌症研究
背景情况:
- 马克斯基因关联 (MGA) 是一种转录因子,抑制MYC向基因,抑制细胞增殖和促进分化.
- 在MGA中功能丧失突变在血液性瘤中很常见,例如急性髓性白血病 (AML) 与RUNX1::RUNX1T1.1.
- MGA改变对正常血液形成和疾病进展的确切影响仍然在很大程度上未被描述.
研究的目的:
- 研究MGA功能丧失突变在血液形成和白血病发生的功能后果.
- 阐明MGA损失有助于增强扩散和AML进展的分子机制.
主要方法:
- 分析患者衍生的MGA突变的蛋白质-蛋白质相互作用和转录活性.
- 利用了人类和小鼠模型系统,包括一个新的条件MGA淘汰赛小鼠菌株.
- 在MGA缺陷模型中评估基因表达,信号通路 (MYC,E2F,mTOR),染色质可访问性和AML发展.
主要成果:
- 来自患者的MGA突变取消了蛋白质-蛋白质相互作用和MYC标的转录抑制.
- 正常的造血细胞中的MGA损失导致对MYC/E2F目标,细胞周期基因,mTOR信号和氧化酸化的上调调节,从而增强了增殖.
- 缺乏MGA诱导细胞周期和增殖基因促进者的开放色素状态.
- 在MGA缺乏细胞中的RUNX1T1表达导致了更具侵略性的AML,延迟时间显著缩短.
结论:
- 在血液细胞中,MGA充当多种促增殖途径的关键调节者.
- 失去MGA与RUNX1::RUNX1T1融合蛋白合作,促进白血病发生.
- 缺乏MGA有助于AML的发病因子,通过增强扩散和加速疾病的进展.
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