Regulation of Cortical Stability by RhoGEF3 in Mitotic Sensory Organ Precursor Cells in

Overview

Journal Biol Open

Specialty Biology

Date 2017 Nov 5

PMID 29101098

Citations 6

Authors

Lydie Couturier

Khalil Mazouni

Fred Bernard

Charlotte Besson

Elodie Reynaud

Francois Schweisguth

Affiliations

Soon will be listed here.

Abstract

In epithelia, mitotic cells round up and push against their neighbors to divide. Mitotic rounding results from increased assembly of F-actin and cortical recruitment of Myosin II, leading to increased cortical stability. Whether this process is developmentally regulated is not well known. Here, we examined the regulation of cortical stability in Sensory Organ Precursor cells (SOPs) in the pupal notum. SOPs differed in apical shape and actomyosin dynamics from their epidermal neighbors prior to division, and appeared to have a more rigid cortex at mitosis. We identified RhoGEF3 as an actin regulator expressed at higher levels in SOPs, and showed that RhoGEF3 had GTPase Exchange Factor (GEF) activity for Cdc42. Additionally, RhoGEF3 genetically interacted with both Cdc42 and Rac1 when overexpressed in the fly eye. Using a null mutation generated by CRISPR-mediated homologous recombination, we showed using live imaging that the gene, despite being dispensable for normal development, contributed to cortical stability in dividing SOPs. We therefore suggest that cortical stability is developmentally regulated in dividing SOPs of the fly notum.

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