CE15 - Immunologie, Infectiologie et Inflammation

cGLR-STING mediated antiviral immunity in drosophila – ROXANNE2

Submission summary

In the course of the ANR-funded ROXANNE (2017-2021) project, we have characterized a novel innate immunity pathway functioning in the control of viral infections in the model organism drosophila. This pathway involves the evolutionarily conserved molecule STING, which activates an NF-kB-dependent transcriptional program that mediates resistance to viral infection. We have recently identified two cGAS-like receptors (cGLRs) involved in the activation of this pathway, through the production of three cyclic dinucleotides (CDNs), 2'3'-cGAMP, 3'2'-cGAMP and 2'3'-c-di-AMP. The goal of this application is to address the new questions raised by this discovery. We will investigate the precise function of the cGLRs in vivo, determining the tissues in which they are active, the cell compartment where they operate and how they integrate their activity with the small interfering (si) RNA pathway, which was until now thought to be the major antiviral mechanism in flies. In particular, we will attempt to identify the ligand activating cGLR2 and the mechanism by which the receptor is activated. In a second aim, we will investigate the function of the three CDNs, addressing their possible role as immunotransmitters in systemic immunity. Finally, we will address the mechanism by which STING activates NF-kB, a question that remains ill characterized in mammals. Overall, this proposal aims at exploiting the resources of the drosophila model to shed light on still poorly understood or emerging aspects of cGAS-STING biology.

Project coordinator

Monsieur Jean-Luc Imler (Modèles insectes d'immunité innée)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

Aarhus University_Department of Molecular Biology and Genetics - RNA Biology and Innovation
Modèles insectes d'immunité innée Centre national de la recherche scientifique
M3I Modèles insectes d'immunité innée

Help of the ANR 386,984 euros
Beginning and duration of the scientific project: January 2023 - 42 Months

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