内源性OptoRhoGEF揭示了表皮组织的生物物理原理
Andrew D Countryman1, Caroline A Doherty2,3,4, R Marisol Herrera-Perez5
1Department of Biomedical Engineering, Columbia University, New York, NY, USA.
Nature communications
|August 18, 2025
概括
科学家们精确地控制了细胞的行为,利用光发育胚胎. 这揭示了细胞收缩如何塑造组织,以及胚胎在发育过程中如何形成特定结构.
科学领域:
- 发育生物学是发展生物学.
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
背景情况:
- 在胚胎发育过程中,上皮组织大量重塑,以建立身体形状.
- 光遗传工具提供精确的控制细胞信号通路,如Rho,对形态发生至关重要.
- 现有的转基因光遗传工具面临着诸如可变表达和发育干扰等挑战.
研究的目的:
- 开发一种新的光遗传系统,用于控制胚胎发育过程中的内源Rho信号.
- 为了研究Rho信号对上皮细胞形态发生的剂量依赖作用.
- 阐明基底性actomyosin在胃化过程中定位和约束组织的作用.
主要方法:
- 基因编辑CRISPR/Cas9标记内源RhoGEF2和囊/Dp114RhoGEF与Drosophila中的iLID/SspB光遗传系统.
- 使用光来控制蛋白质招募和Rho信号的定量光遗传学扰动.
- 组织形态,3D成像和分析组织形态,纹形成和actomyosin动态.
主要成果:
- 对被标记的RhoGEFs在膜上依赖光线的招募能够精确控制内源蛋白活性.
- 在RhoGEF招募水平和组织深度和曲之间观察到明显的剂量依赖.
- 基础性actomyosin网络被确定为早期胃流动期间的方向和大小的关键调节者.
结论:
- 开发的光遗传系统允许在体内对内源蛋白活性进行定量,光可诱导的控制.
- 这种方法揭示了对表皮形态发生和由细胞收缩驱动的组织成形机制的关键见解.
- 这些发现强调了细胞收缩的精确空间和时间控制,作为研究发育机制的强大工具.
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