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通过秀丽隐杆线虫早期胚胎中AIR-1动力学揭示的中心体成熟不对称性。

Asymmetry in centrosome maturation revealed through AIR-1 dynamics in the early Caenorhabditis elegans embryo.

作者信息

Plourde Shayne M, Kravtsova Natalia, Dawes Adriana T

机构信息

Molecular, Cellular, and Developmental Biology Program, The Ohio State University, Columbus, OH, USA.

Department of Molecular Genetics, The Ohio State University, Columbus, OH, USA.

出版信息

Sci Rep. 2025 Mar 13;15(1):8667. doi: 10.1038/s41598-025-86548-0.

Abstract

Centrosomes are critical organelles associated with the nucleus, consisting of a pair of centrioles surrounded by a cloud of pericentriolar material. They serve as key nucleation sites for microtubule arrays and are essential for positioning the nucleus prior to cell division, but mechanisms for ensuring proper centrosome positioning are not well understood. Previous research has identified asymmetries in microtubule arrays nucleated by centrosomes prior to cell division, including during the first cell cycle in Caenorhabditis elegans, as playing a critical role in centrosome positioning, however the origin of this asymmetry remains unclear. To explore potential sources of centrosome asymmetry, we developed a mathematical model of centrosome maturation, distinct from prior models by not presuming any inherent symmetry or asymmetry. We determined model parameters using in vivo data on the recruitment and recovery of GFP-tagged AIR-1 (Aurora kinase A) in early C. elegans embryos, enabling precise parameter estimation. Our results reveal an intrinsic asymmetry in centrosome dynamics that highlights the potential for variability in physical centrosome characteristics. These dynamics produce highly consistent microtubule arrays, independent of specific structural details. These findings offer novel insights into centrosome behavior and positioning during cell division and early embryonic development.

摘要

中心体是与细胞核相关的关键细胞器,由一对中心粒和围绕在其周围的中心粒周围物质云组成。它们是微管阵列的关键成核位点,对于细胞分裂前细胞核的定位至关重要,但确保中心体正确定位的机制尚不清楚。先前的研究已经确定,在细胞分裂之前,包括在秀丽隐杆线虫的第一个细胞周期中,由中心体形成的微管阵列不对称性在中心体定位中起着关键作用,然而这种不对称性的起源仍不清楚。为了探索中心体不对称性的潜在来源,我们开发了一个中心体成熟的数学模型,该模型与先前的模型不同,不假定任何固有的对称性或不对称性。我们利用秀丽隐杆线虫早期胚胎中绿色荧光蛋白标记的AIR-1(极光激酶A)的募集和恢复的体内数据确定模型参数,从而实现精确的参数估计。我们的结果揭示了中心体动力学中的内在不对称性,突出了中心体物理特征变异性的可能性。这些动力学产生高度一致的微管阵列,与特定的结构细节无关。这些发现为细胞分裂和早期胚胎发育过程中的中心体行为和定位提供了新的见解。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/21d9/11906807/ef690dfe50c1/41598_2025_86548_Fig1_HTML.jpg

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