在MYC-FBW7基突变中的生殖点突变引发了血液形成恶性瘤
Brian Freie1, Patrick A Carroll1, Barbara J Varnum-Finney2
1Basic Sciences Division, Fred Hutchinson Cancer Center, Seattle WA, USA.
bioRxiv : the preprint server for biology
|November 14, 2023
概括
在小鼠中,MYC基因 (MYC-T58A) 的单点突变导致血液生成原体的自我更新增加,导致淋巴瘤和白血病. 这突出了MYC的优势.
科学领域:
- * 分子生物学 * 分子生物学
- * 癌症生物学 癌症生物学
- * 血液形成的过程.
背景情况:
- *癌症中MYC的致癌激活通常涉及转录的增加,而不是编码突变.
- *依赖MYC的淋巴瘤通常在MYC的酸降解基因中发生点突变,特别是在threonine-58 (T58) 中.
- * T58酸化通常针对MYC,以通过FBW7基酶降解.
研究的目的:
- * 研究T58酸化在MYC功能中的生理作用.
- * 在体内确定非酸化MYC T58A突变的后果.
- * 探索这种突变对造血干细胞/原始细胞行为和瘤发生的影响.
主要方法:
- * 在内源性c-Myc位点 (MYC-T58A) 中的T58残留物中用氨酸替代产生小鼠.
- *对MYC-T58A小鼠的造血原生细胞自我更新,基因表达和MYC基因组占用率的分析.
- *对同卵性T58A小鼠的淋巴瘤和白血病发展的评估.
主要成果:
- *MYC-T58A小鼠的发育正常,但在成年后出现~60%的淋巴瘤和骨髓性白血病.
- *来自MYC-T58A小鼠的造血原生细胞显示出异常的自我更新和特定的Myc标基因的上调.
- *MYC-T58A显示了促进者的基因组占用率增加和基因表达模式的改变,特别是在MYC结合增强剂附近.
- *带有MYC-T58A的淋巴细胞原始体表现出代谢变化和减少炎症和亡通路激活.
结论:
- * 一个单点突变使MYC在T58无酸化,足以诱导功能获取表型.
- *这种功能增长在多潜血造原始体中与自我更新的增加以及淋巴瘤和白血病的发病有关.
- *这项研究阐明了MYC酸化在T58在调节正常的造血原体功能和预防瘤发生的关键作用.
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