Détail du document
Identifiant
oai:HAL:hal-03440020v1
Sujet
influenza RNA structure evolution highly pathogenic avian influenza ... [SDV.MP.VIR]Life Sciences [q-bio]/... [SDV.BID.EVO]Life Sciences [q-bio]...Auteur
Dupré, Gabriel Hoede, Claire Figueroa, Thomas Bessière, Pierre Bertagnoli, Stéphane Ducatez, Mariette Gaspin, Christine Volmer, RomainLangue
enEditeur
HAL CCSD;Oxford University Press
Catégorie
sciences : sciences du vivant
Année
2021
Date de référencement
15/12/2023
Mots clés
hemagglutinin evolution specific cleavage region rna h5 ha structure hpaiv lpaiv avian pathogenic influenzaRésumé
International audience; Highly Pathogenic Avian Influenza Viruses (HPAIV) evolve from Low Pathogenic Avian Influenza Viruses (LPAIV) of the H5 and H7 subtypes.
This evolution is characterized by the acquisition of a multi-basic cleavage site (MBCS) motif in the hemagglutinin (HA) that leads to an extended viral tropism and severe disease in poultry.
One key unanswered question is whether the risk of transition to HPAIV is similar for all LPAIV H5 or H7 strains, or whether specific determinants in the HA sequence of some H5 or H7 LPAIV strains correlate with a higher risk of transition to HPAIV.
Here we determined if specific features of the conserved RNA stem loop located at the hemagglutinin cleavage site-encoding region could be detected along the LPAIV to HPAIV evolutionary pathway.
Analysis of the thermodynamic stability of the predicted RNA structures showed no specific patterns common to HA sequences leading to HPAIV and distinct from those remaining LPAIV.
However, RNA structure clustering analysis revealed that most of the American lineage ancestors leading to H7 emergences via recombination shared the same vRNA structure topology at the HA1/HA2 boundary region.
Our study thus identified predicted secondary RNA structures present in the HA of H7 viruses, which could promote genetic recombination and acquisition of a MBCS.
Dupré, Gabriel,Hoede, Claire,Figueroa, Thomas,Bessière, Pierre,Bertagnoli, Stéphane,Ducatez, Mariette,Gaspin, Christine,Volmer, Romain, 2021, Phylodynamic Study of the Conserved RNA Structure Encompassing the Hemagglutinin Cleavage Site Encoding Region of H5 and H7 Low Pathogenic Avian Influenza Viruses, HAL CCSD;Oxford University Press
