Evolution of attenuation and risk of reversal in Peste des Petits Ruminants vaccine strain Nigeria 75/1

Eloiflin Roger-Junior, Boyer Marie, Kwiatek Olivier, Guendouz Samia, Loire Etienne, Servan de Almeida Renata, Libeau Geneviève, Bataille Arnaud. 2019. Evolution of attenuation and risk of reversal in Peste des Petits Ruminants vaccine strain Nigeria 75/1. Viruses, 11 (8):724, 18 p.

Quartile : Q2, Sujet : VIROLOGY

Résumé : Peste des Petits Ruminants (PPR) is a highly infectious disease caused by a virus of the Morbillivirus genus. The current PPR eradication effort relies mainly on the implementation of massive vaccination campaigns. One of the most widely used PPR vaccines is the Nigeria 75/1 strain obtained after attenuation by 75 serial passages of the wild type isolate in cell cultures. Here we use high throughput deep sequencing of the historical passages that led to the Nigeria 75/1 attenuated strain to understand the evolution of PPRV attenuation and to assess the risk of reversal in different cell types. Comparison of the consensus sequences of the wild type and vaccine strains showed that only 18 fixed mutations separate the two strains. At the earliest attenuation passage at our disposal (passage 47), 12 out of the 18 mutations were already present at a frequency of 100%. Low-frequency variants were identified along the genome in all passages. Sequencing of passages after the vaccine strain showed evidence of genetic drift during cell passages, especially in cells expressing the SLAM receptor targeted by PPRV. However, 15 out of the 18 mutations related to attenuation remained fixed in the population. In vitro experiments suggest that one mutation in the leader region of the PPRV genome affects virus replication. Our results suggest that only a few mutations can have a serious impact on the pathogenicity of PPRV. Risk of reversion to virulence of the attenuated PPRV strain Nigeria 75/1 during serial passages in cell cultures seems low but limiting the number of passages during vaccine production is recommended.

Mots-clés Agrovoc : peste des petits ruminants, vaccination, séquence nucléotidique

Mots-clés géographiques Agrovoc : Nigéria

Mots-clés libres : PPR, Attenuation, Deep sequencing, Morbillivirus, Vaccine, Virulence, Wild strain

Classification Agris : L73 - Maladies des animaux
S50 - Santé humaine

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Auteurs et affiliations

• Eloiflin Roger-Junior, CIRAD-BIOS-UMR ASTRE (FRA)
• Boyer Marie, Université de Montpellier (FRA)
• Kwiatek Olivier, CIRAD-BIOS-UMR ASTRE (FRA)
• Guendouz Samia, INRA (FRA)
• Loire Etienne, CIRAD-BIOS-UMR ASTRE (FRA)
• Servan de Almeida Renata, CIRAD-BIOS-UMR ASTRE (FRA)
• Libeau Geneviève, CIRAD-BIOS-UMR ASTRE (FRA)
• Bataille Arnaud, CIRAD-BIOS-UMR ASTRE (FRA) ORCID: 0000-0002-3508-2144 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/593432/)

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