Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 119, Issue 12, Pages -Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2119381119
Keywords
cytokinesis; cell polarity; embryo development; contractile ring; furrow ingression
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada
- Fondation Jean-Louis Levesque
- Canadian Foundation for Innovation
- Canadian Institutes of Health Research
- Fonds de Recherche du Quebec-Sante Doctoral Scholarship
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This study investigates the dynamics of furrow ingression in early mouse embryos during cell division. It finds that cell size is an important determinant of furrow ingression speed, and the emergence of cell polarity and assembly of the apical domain negatively regulate furrow ingression on one side. The study reveals that cell polarity directly regulates the recruitment of cytokinetic machinery in a cell-autonomous manner.
Cytokinesis is the final step of cell division during which a contractile ring forms a furrow that partitions the cytoplasm in two. How furrow ingression is spatiotemporally regulated and how it is adapted to complex cellular environments and developmental transitions remain poorly understood. Here, we examine furrow ingression dynamics in the context of the early mouse embryo and find that cell size is a powerful determinant of furrow ingression speed during reductive cell divisions. In addition, the emergence of cell polarity and the assembly of the apical domain in outer cells locally inhibits the recruitment of cytokinesis components and thereby negatively regulates furrow ingression specifically on one side of the furrow. We show that this biasing of cytokinesis is not dependent upon cell-cell adhesion or shape but rather is cell intrinsic and is caused by a paucity of cytokinetic machinery in the apical domain The results thus reveal that in the mouse embryo cell polarity directly regulates the recruitment of cytokinetic machinery in a cell-autonomous manner and that subcellular organization can instigate differential force generation and constriction speed in different zones of the cytokinetic furrow.
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