PT  - JOURNAL ARTICLE
AU  - Florencia di Pietro
AU  - Mariana Osswald
AU  - José M De las Heras
AU  - Ines Cristo
AU  - Jesus Lopez- Gay
AU  - Zhimin Wang
AU  - Stéphane Pelletier
AU  - Isabelle Gaugué
AU  - Adrien Leroy
AU  - Charlotte Martin
AU  - Eurico Morais-De-Sá
AU  - Yohanns Bellaïche
TI  - Systematic characterization of <em>Drosophila</em> RhoGEF/GAP localizations uncovers regulators of mechanosensing and junction formation during epithelial cell division
AID  - 10.1101/2022.12.29.522184
DP  - 2022 Jan 01
TA  - bioRxiv
PG  - 2022.12.29.522184
4099  - http://biorxiv.org/content/early/2022/12/29/2022.12.29.522184.short
4100  - http://biorxiv.org/content/early/2022/12/29/2022.12.29.522184.full
AB  - Cell proliferation is central to epithelial tissue development, repair and homeostasis. During cell division, small RhoGTPases control both actomyosin dynamics and cell-cell junction remodelling to faithfully segregate the duplicated genome while maintaining tissue polarity and integrity. To decipher the mechanisms of RhoGTPases spatiotemporal regulation during epithelial cell division, we generated a transgenic fluorescently tagged library for Drosophila Rho Guanine exchange factors (GEF) and GTPase activating proteins (GAP), and systematically characterized their endogenous distributions by time- lapse microscopy. Thereby, we unveiled candidate regulators of the interplay between actomyosin and junctional dynamics during epithelial cell division. Building on these findings, we uncovered that during cytokinesis, Cysts and RhoGEF4 play sequential roles in mechanosensing and de novo junction formation, respectively. We foresee that the RhoGEF/GAP library will be a key resource to understand the broad range of biological processes regulated by RhoGTPases.Competing Interest StatementThe authors have declared no competing interest.