动氨酸脉冲拯救了胚胎组织折叠,使其免受肌素波动的破坏
Hongkang Zhu1, Ben O'Shaughnessy1
1Department of Chemical Engineering, Columbia University, New York, NY 10027, USA.
Research square
|October 27, 2023
概括
肌素II通过动肌素收缩驱动胚胎组织折叠. 生物物理建模揭示粘性力和肌酸蛋白曲模式决定了组织形状,脉冲避免了曲失败.
科学领域:
- 发育生物学 发展生物学
- 生物物理学的生物物理.
- 细胞生物学 细胞生物学
背景情况:
- 肌酸二是胚胎组织重塑的关键,例如Drosophila在胃化过程中形成腹腔.
- 阿克托米奥辛网络的收缩驱动了尖端收缩,但其在组织塑造中的确切作用和肌素波动的意义仍然不清楚.
- 现有的弹性模型无法完全解释在形态发生过程中的实验性细胞收缩概况.
研究的目的:
- 为了研究胚胎形态发生过程中由actomyosin驱动的顶部收缩背后的生物物理机制.
- 为了阐明myosin II模式如何编码组织形状并驱动腹腔的形成.
- 解释细胞间髓素波动及其在成功组织折叠中的时间依赖性的作用.
主要方法:
- 利用生物物理建模来模拟actomyosin网络动态和组织变形.
- 分析了粘性力对由actomyosin驱动的尖端收缩的影响.
- 研究了细胞对细胞的肌素波动及其频谱对动态的影响.
主要成果:
- 粘性力,而不是弹性,是对由actomyosin驱动的尖端收缩的主要抵抗力.
- 肌酸蛋白模式中的方向依赖曲率编码组织形状,定位前后.
- 脉冲性髓素时间依赖作用为低通波器,避免由持续的细胞间波动引起的裂失效.
结论:
- 野生类型胚胎中的脉动性髓素时间依赖性充当低通波器,避免由高频波动引起的毛失效.
- 这种脉动性机制可能是各种生物体中基于actomyosin的形态发生的保存策略.
- 了解这些动态,可以了解组织形态发生和发育过程的基本原理.
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