H2N2V1, Hal, Checkpoint, bibRecord, 000259

Genetic reassortment of influenza viruses with different origins or subtypes

Identifieur interne : 000259 ( Hal/Checkpoint ); précédent : 000258; suivant : 000260

Genetic reassortment of influenza viruses with different origins or subtypes

Auteurs : Maude Bouscambert-Duchamp [France]

Source :

RBID : Hal:tel-00733681

Descripteurs français

mix :
- Génétique inverse, RT-PCR quantitative, Réassortiment génétique, Virus influenza.

English descriptors

mix :
- A(H1N1)2009, A(H5N1), Genetic reassortment, Influenza virus, Quantitative RT-PCR, Reverse genetic.

Abstract

In the context of A(H5N1) pandemics threat, an « avian flu and flu pandemics » project was proposed by LyonBioPole to develop influenza viruses characterization tools for vaccine production. To study genetic reassortment between influenza viruses, 3 reverse genetic systems of A(H3N2) human virus and A(H5N2) and A(H5N1) avian viruses were developed and reassortant viruses were produced. Their replicative capacities were evaluated using growth kinetics on MDCK cells with viral production quantification by real-time qRT-PCR. The A(H1N1)2009 emergence raises two questions about the acquisition by genetic reassortment of oseltamivir resistance and/or pathogenicity determinants. A co-infection protocol on MDCK cells was developed to study gene constellations of reassortant viruses like A(H1N1)2009-A(H1N1) H275Y and A(H1N1)2009-A(H5N1). We report here that genetic reassortment is possible between avian, human and swine strains using reverse genetic and viral co-infection and that some specific constellations emerged. We also report, that pandemic A(H1N1)2009 can acquire the H275Y mutated NA from seasonal oseltamivir resistant A(H1N1) viruses without any modifications on replicative capacities. This genetic reassortment is also possible with A(H5N1) viruses. These observations strenght the importance of vaccination against all these influenza strains to reduce the risk of one-individual viral co-infection.

Url:

https://tel.archives-ouvertes.fr/tel-00733681

Links toward previous steps (curation, corpus...)

to stream Hal, to step Corpus: 000118
to stream Hal, to step Curation: 000118

Links to Exploration step

Hal:tel-00733681

Le document en format XML

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<front><div type="abstract" xml:lang="en">              <p>In the context of A(H5N1) pandemics threat, an « avian flu and flu pandemics » project was proposed by LyonBioPole to develop influenza viruses characterization tools for vaccine production. To study genetic reassortment between influenza viruses, 3 reverse genetic systems of A(H3N2) human virus and A(H5N2) and A(H5N1) avian viruses were developed and reassortant viruses were produced. Their replicative capacities were evaluated using growth kinetics on MDCK cells with viral production quantification by real-time qRT-PCR. The A(H1N1)2009 emergence raises two questions about the acquisition by genetic reassortment of oseltamivir resistance and/or pathogenicity determinants. A co-infection protocol on MDCK cells was developed to study gene constellations of reassortant viruses like A(H1N1)2009-A(H1N1) H275Y and A(H1N1)2009-A(H5N1). We report here that genetic reassortment is possible between avian, human and swine strains using reverse genetic and viral co-infection and that some specific constellations emerged. We also report, that pandemic A(H1N1)2009 can acquire the H275Y mutated NA from seasonal oseltamivir resistant A(H1N1) viruses without any modifications on replicative capacities. This genetic reassortment is also possible with A(H5N1) viruses. These observations strenght the importance of vaccination against all these influenza strains to reduce the risk of one-individual viral co-infection.</p>
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            <abstract xml:lang="en">              <p>In the context of A(H5N1) pandemics threat, an « avian flu and flu pandemics » project was proposed by LyonBioPole to develop influenza viruses characterization tools for vaccine production. To study genetic reassortment between influenza viruses, 3 reverse genetic systems of A(H3N2) human virus and A(H5N2) and A(H5N1) avian viruses were developed and reassortant viruses were produced. Their replicative capacities were evaluated using growth kinetics on MDCK cells with viral production quantification by real-time qRT-PCR. The A(H1N1)2009 emergence raises two questions about the acquisition by genetic reassortment of oseltamivir resistance and/or pathogenicity determinants. A co-infection protocol on MDCK cells was developed to study gene constellations of reassortant viruses like A(H1N1)2009-A(H1N1) H275Y and A(H1N1)2009-A(H5N1). We report here that genetic reassortment is possible between avian, human and swine strains using reverse genetic and viral co-infection and that some specific constellations emerged. We also report, that pandemic A(H1N1)2009 can acquire the H275Y mutated NA from seasonal oseltamivir resistant A(H1N1) viruses without any modifications on replicative capacities. This genetic reassortment is also possible with A(H5N1) viruses. These observations strenght the importance of vaccination against all these influenza strains to reduce the risk of one-individual viral co-infection.</p>
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            <abstract xml:lang="fr">              <p>Dans le contexte de la menace pandémique liée au virus influenza A(H5N1), un projet «GRIPPE AVIAIRE ET GRIPPE PANDÉMIQUE » a émergé au sein de LyonBioPôle avec comme objectif  le développement d’outils de caractérisation des virus influenza pour la production de vaccins. Pour étudier le réassortiment génétique entre virus influenza, nous avons développé 3 systèmes de génétique inverse : virus humain A(H3N2) et aviaires A(H5N2) et A(H5N1) et produit des virus réassortants de composition déterminée. Leurs capacités réplicatives ont été évaluées par cinétiques de croissance virale sur MDCK avec quantification de la production virale par qRT-PCR temps réel. L’émergence du virus influenza A(H1N1)2009 pose deux questions sur l’acquisition par réassortiment génétique, d’une résistance à l’oseltamivir d’une part ou de facteurs de virulence d’autre part. Nous avons donc développé un protocole de co-infection virale de cellules MDCK pour étudier les constellations de gènes des réassortants entre différents virus: A(H1N1)2009-A(H1N1) H275Y et A(H1N1)2009-A(H5N1). Nous montrons par deux approches différentes, génétique inverse et co-infections virales, que le réassortiment génétique entre souches aviaires et humaines et surtout aviaires et porcines est possible, en privilégiant certaines constellations. Nous rapportons que le virus pandémique peut acquérir la NA H275Y des virus A(H1N1) Brisbane-like résistants à l’oseltamivir sans que ses capacités de réplication ne soient altérées. De même nous montrons que son réassortiment avec un virus hautement pathogène A(H5N1) est possible. Ces observations renforcent la nécessité de promouvoir la vaccination afin de limiter les risques de co-infection virale chez un même individu.</p>
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Genetic reassortment of influenza viruses with different origins or subtypes

Genetic reassortment of influenza viruses with different origins or subtypes

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