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© Institut Pasteur
Phlébotome. Petit diptère de la famille des psychodidés (dans l'Ancien Monde). La femelle hématophage peut être vectrice entre autres de leishmaniose qu'elle transmet par piqûre à un vertébré, chien (hôte principal réservoir), homme ou encore rat (hôtes occasionnels).
Publication : Nature immunology

RNA-mediated interference and reverse transcription control the persistence of RNA viruses in the insect model Drosophila

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Nature immunology - 24 Feb 2013

Goic B, Vodovar N, Mondotte JA, Monot C, Frangeul L, Blanc H, Gausson V, Vera-Otarola J, Cristofari G, Saleh MC

Link to Pubmed [PMID] – 23435119

Nat. Immunol. 2013 Apr;14(4):396-403

How persistent viral infections are established and maintained is widely debated and remains poorly understood. We found here that the persistence of RNA viruses in Drosophila melanogaster was achieved through the combined action of cellular reverse-transcriptase activity and the RNA-mediated interference (RNAi) pathway. Fragments of diverse RNA viruses were reverse-transcribed early during infection, which resulted in DNA forms embedded in retrotransposon sequences. Those virus-retrotransposon DNA chimeras produced transcripts processed by the RNAi machinery, which in turn inhibited viral replication. Conversely, inhibition of reverse transcription hindered the appearance of chimeric DNA and prevented persistence. Our results identify a cooperative function for retrotransposons and antiviral RNAi in the control of lethal acute infection for the establishment of viral persistence.

http://www.ncbi.nlm.nih.gov/pubmed/23435119