Poirier E. Z., Goic B., Tome-Poderti L., Frangeul L., Boussier J., Gausson V., Blanc H., Vallet T., Loyd H., Levi L. I., Lanciano Sophie, Baron C., Merkling S. H., Lambrechts L., Mirouze Marie, Carpenter S., Vignuzzi M., Saleh M. C. (2018). Dicer-2-dependent generation of viral DNA from defective genomes of RNA viruses modulates antiviral immunity in insects. Cell Host and Microbe, 23 (3), p. 353-365 + annexes e1–e7. ISSN 1931-3128.
Titre du document
Dicer-2-dependent generation of viral DNA from defective genomes of RNA viruses modulates antiviral immunity in insects
Année de publication
2018
Auteurs
Poirier E. Z., Goic B., Tome-Poderti L., Frangeul L., Boussier J., Gausson V., Blanc H., Vallet T., Loyd H., Levi L. I., Lanciano Sophie, Baron C., Merkling S. H., Lambrechts L., Mirouze Marie, Carpenter S., Vignuzzi M., Saleh M. C.
Source
Cell Host and Microbe, 2018,
23 (3), p. 353-365 + annexes e1–e7 ISSN 1931-3128
The RNAi pathway confers antiviral immunity in insects. Virus-specific siRNA responses are amplified via the reverse transcription of viral RNA to viral DNA (vDNA). The nature, biogenesis, and regulation of vDNA are unclear. We find that vDNA produced during RNA virus infection of Drosophila and mosquitoes is present in both linear and circular forms. Circular vDNA (cvDNA) is sufficient to produce siRNAs that confer partially protective immunity when challenged with a cognate virus. cvDNAs bear homology to defective viral genomes (DVGs), and DVGs serve as templates for vDNA and cvDNA synthesis. Accordingly, DVGs promote the amplification of vDNA-mediated antiviral RNAi responses in infected Drosophila. Furthermore, vDNA synthesis is regulated by the DExD/H helicase domain of Dicer-2 in a mechanism distinct from its role in siRNA generation. We suggest that, analogous to mammalian RIG-I-like receptors, Dicer-2 functions like a pattern recognition receptor for DVGs to modulate antiviral immunity in insects.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
;
Entomologie médicale / Parasitologie / Virologie [052]
Localisation
Fonds IRD [F B010072512]
Identifiant IRD
fdi:010072512
