在人类IGF-1基因中识别功能罕见的编码变异,具有异常长寿
Amanat Ali1,2, Zhengdong Zhang3,2, Tina Gao1,2
1Department of Medicine, Albert Einstein College of Medicine, NY, USA, 10461.
bioRxiv : the preprint server for biology
|October 17, 2024
概括
在百岁以上的人群中发现了胰岛素样生长因子-1 (IGF-1) 基因的两种新型遗传变异. 这些变体,IGF-1:p.Ile91Leu和IGF-1:p.Ala118Thr,通过减少IGF-1信号传递,可能有助于人类的长寿.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 老年学是一门学科.
背景情况:
- 胰岛素/胰岛素类生长因子-1 (IGF-1) 轴的信号减少与物种间的寿命有关.
- IGF-1基因高度保守,在人类寿命研究中以前没有发现编码变异.
- 研究IGF-1的功能编码变体对于理解其在人类寿命中的作用至关重要.
研究的目的:
- 在阿什基纳兹犹太百岁老人,他们的后代和对照群体中识别IGF-1基因的功能编码变异.
- 调查已识别的变异对IGF-1信号传递和与IGF-1受体 (IGF-1R) 的结合亲和力的影响.
- 探索这些变体对人类异常长寿的潜在贡献.
主要方法:
- 从长寿队列 (百岁老人,后代,对照) 中,对2,487个个体的整体外基因组测序.
- 在IGF-1基因中识别和描述功能编码变异.
- 扩展了全原子分子动力学模拟,以评估IGF-1:p.Ile91Leu变异对IGF-1/IGF-1R结合动力学和稳定性的影响.
主要成果:
- 在长寿队列中发现了两种可能的功能编码变体,即IGF-1:p.Ile91Leu和IGF-1:p.Ala118Thr.
- 新的IGF-1:p.Ile91Leu变体位于IGF-1/IGF-1R结合接口,降低了结合亲和力和稳定性.
- IGF-1:p.Ala118Thr变异与循环IGF-1水平显著降低有关.
结论:
- 已识别的IGF-1变体p.Ile91Leu和p.Ala118Thr减弱了IGF-1受体的活性.
- p.Ile91Leu损害了IGF-1与IGF-1R的结合,而p.Ala118Thr降低了循环中的IGF-1水平.
- 这些发现表明,由于这些变体,IGF-1信号减少可能在促进人类异常长寿方面发挥作用.
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