STAT3 SH2 域 酸 661 突变激活免疫基因程序
Hye Kyung Lee1, Gyuhyeok Cho2, Jichun Chen3
1Section of Genetics and Physiology, National Institute of Diabetes and Digestive and Kidney Diseases, US National Institutes of Health, Bethesda, Maryland, USA.
Journal of cellular and molecular medicine
|January 13, 2026
概括
血液癌症中的STAT3 D661突变会导致各种功能增益效应. D661Y和D661V变种表现出强烈的活动,影响T细胞活力和免疫反应.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 免疫学 免疫学 免疫学
背景情况:
- STAT3 SH2 域有一个保存的酸残留物D661.1.
- D661是血液恶性瘤的突变热点,如T细胞大粒状淋巴细胞白血病,骨髓质综合征和急性淋巴细胞白血病.
研究的目的:
- 定义不同STAT3 D661变体的功能后果.
- 研究这些变异对STAT3功能和细胞过程的影响.
主要方法:
- 计算分析 (AlphaMissense,PolyPhen-2,AlphaFold 3) 和结构建模.
- 使用Stat3缺乏T细胞进行体外功能测试.
- 使用转基因小鼠进行体内研究.
主要成果:
- 所有四种STAT3 D661变种 (D661Y,D661V,D661N,D661H) 都被预测为致病性. D661Y和D661V显示出更强的预测促进SH2-TAD介导的二分化.
- 在试验室中,观察到一种功能获取层次结构:D661Y ≈ V > H > N,激活STAT3目标基因和免疫程序.
- 在体内,只有STAT3 D661H小鼠是可活的,表现出改变的CD4+和CD8+T细胞群和增强的免疫基因表达. D661Y和D661V突变影响了小鼠的生存能力.
结论:
- 确定了STAT3 D661功能增益变体的梯度,与体外和体内发现相关.
- 更强大的STAT3 D661变体 (D661Y,D661V) 呈现出更高的转录活性,但导致小鼠生存能力受损.
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