The objective of this project is to analyze host-defense mechanisms against viral infection in the model organism Drosophila melanogaster, and to do so in the light of concurrent studies of viral infection in mice, carried out by our colleagues in La Jolla and in Osaka. By studying the response of Drosophila to viral infection we will uncover evolutionarily conserved mechanisms of innate immunity that, together with the programs developed in the other participating laboratories, will help to unravel the essential aspects of the antiviral response in mammals. The project has two specific aims, which are based on the original results obtained by the laboratory in the past five years. The picture emerging from these studies is that of a complex, multi-faceted program of defense, essentially based on RNA interference and an inducible response, on which our knowledge is still fragmentary. In this new application, we aim to produce an integrative view of the sensing, signaling and effector mechanisms leading to resistance to virus infection in drosophila.
The first aim i s to conduct unbiased forward genetic screens to identify mutations that impair the antiviral response. The readout for the screens will be the viral load (using GFP-expressing recombinant viruses), and the survival to viral infection. We propose to take advantage of the technological breakthrough of SOLiD high throughput sequencing to rapidly identify the mutated genes in a cost effective manner by whole genome resequencing.
The second aim i s to characterize the role of three evolutionarily conserved pathways, namely RNAi, Toll and Imd, in antiviral defense in drosophila. The experimental strategy will be to identify by a powerful method combining the unparalleled affinity of avidin for biotin and the exquisite sensitivity of nanoLC-tandem mass spectrometry the molecules interacting with selected components of the RNA interference, Imd and Toll pathways. The composition of these complexes will be compared in cells either uninfected or infected by viruses replicating in different cytoplasmic locations. The function of the identified molecules will be characterized in cells and flies. In addition, we will study by live imaging in infected cells the interaction of the canonical molecules of the RNAi pathway (Dicer-2, R2D2 and AGO2) with viral RNAs.
We anticipate that this project will allow us to reveal novel evolutionarily conserved pathways of host-defense, as we earlier did for Toll-like receptors. Understanding the molecular mechanisms of antiviral immunity in drosophila may also lead us to propose novel strategies to fight viral infections. Finally, this project is expected to shed light on the interaction between vector insects and the pathogenic arthropod- borne viruses they transmit to humans.
|Marques, JoÃ£o T; Imler, Jean-Luc (2016) The diversity of insect antiviral immunity: insights from viruses. Curr Opin Microbiol 32:71-6|
|Lamiable, Olivier; Arnold, Johan; de Faria, Isaque Joao da Silva et al. (2016) Analysis of the Contribution of Hemocytes and Autophagy to Drosophila Antiviral Immunity. J Virol 90:5415-26|
|Lamiable, Olivier; Kellenberger, Christine; Kemp, Cordula et al. (2016) Cytokine Diedel and a viral homologue suppress the IMD pathway in Drosophila. Proc Natl Acad Sci U S A 113:698-703|
|Beutler, Bruce (2016) Innate immunity and the new forward genetics. Best Pract Res Clin Haematol 29:379-387|
|Zhang, Zhao; Turer, Emre; Li, Xiaohong et al. (2016) Insulin resistance and diabetes caused by genetic or diet-induced KBTBD2 deficiency in mice. Proc Natl Acad Sci U S A 113:E6418-E6426|
|Wang, Tao; Zhan, Xiaowei; Bu, Chun-Hui et al. (2015) Real-time resolution of point mutations that cause phenovariance in mice. Proc Natl Acad Sci U S A 112:E440-9|
|Mager, Lukas F; Riether, Carsten; SchÃ¼rch, Christian M et al. (2015) IL-33 signaling contributes to the pathogenesis of myeloproliferative neoplasms. J Clin Invest 125:2579-91|
|Girardi, Erika; LefÃ¨vre, Mathieu; Chane-Woon-Ming, BÃ©atrice et al. (2015) Cross-species comparative analysis of Dicer proteins during Sindbis virus infection. Sci Rep 5:10693|
|Kozaki, Tatsuya; Takahama, Michihiro; Misawa, Takuma et al. (2015) Role of zinc-finger anti-viral protein in host defense against Sindbis virus. Int Immunol 27:357-64|
|Paro, Simona; Imler, Jean-Luc; Meignin, Carine (2015) Sensing viral RNAs by Dicer/RIG-I like ATPases across species. Curr Opin Immunol 32:106-13|
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