Scientific article

Initiation of multicellular differentiation in Dictyostelium discoideum is regulated by coronin A

Published inMolecular biology of the cell, vol. 25, no. 5, p. 688-701
Publication date2014

Many biological systems respond to environmental changes by activating intracellular signaling cascades, resulting in an appropriate response. One such system is represented by the social amoeba Dictyostelium discoideum. When food sources become scarce, these unicellular cells can initiate a cAMP-driven multicellular aggregation program to ensure long-term survival. On starvation, the cells secrete conditioned medium factors that initiate cAMP signal transduction by inducing expression of genes such as cAMP receptors and adenylate cyclase. The mechanisms involved in the activation of the first pulses of cAMP release have been unclear. We here show a crucial role for the evolutionarily conserved protein coronin A in the initiation of the cAMP response. On starvation, coronin A-deficient cells failed to up-regulate the expression of cAMP-regulated genes, thereby failing to initiate development, despite a normal prestarvation response. Of importance, external addition of cAMP to coronin A-deficient cells resulted in normal chemotaxis and aggregate formation, thereby restoring the developmental program and suggesting a functional cAMP relay in the absence of coronin A. These results suggest that coronin A is dispensable for cAMP sensing, chemotaxis, and development per se but is part of a signal transduction cascade essential for system initiation leading to multicellular development in Dictyostelium.

Research group
Citation (ISO format)
VINET, Adrien F et al. Initiation of multicellular differentiation in Dictyostelium discoideum is regulated by coronin A. In: Molecular biology of the cell, 2014, vol. 25, n° 5, p. 688–701. doi: 10.1091/mbc.E13-04-0219
Main files (1)
Article (Published version)
ISSN of the journal1059-1524

Technical informations

Creation07/11/2014 6:14:00 PM
First validation07/11/2014 6:14:00 PM
Update time03/14/2023 9:31:37 PM
Status update03/14/2023 9:31:37 PM
Last indexation01/16/2024 11:36:59 AM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack