Serveur d'exploration H2N2

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Prediction of the next highly pathogenic avian influenza pandemic that can cause illness in humans

Identifieur interne : 000529 ( Main/Exploration ); précédent : 000528; suivant : 000530

Prediction of the next highly pathogenic avian influenza pandemic that can cause illness in humans

Auteurs : Zhong-Wei Zhang [République populaire de Chine] ; Ting Liu [République populaire de Chine] ; Jian Zeng [République populaire de Chine] ; Yang-Er Chen [République populaire de Chine, Suède] ; Ming Yuan [République populaire de Chine, États-Unis] ; Da-Wei Zhang [République populaire de Chine, États-Unis] ; Feng Zhu [République populaire de Chine] ; Shu Yuan [République populaire de Chine]

Source :

RBID : PMC:4661964

Descripteurs français

English descriptors

Abstract

Background

In recent years, avian influenza viruses (AIVs) have seriously threatened human health. Questions such as: why do AIVs infect humans?, how quickly can an AIV become pandemic?, and which virus is the most dangerous? cannot be sufficiently answered using current bioinformatic studies.

Method

Secondary structures and energies of representative 5′-untranslated region (UTR) of the HA gene were calculated. Then their secondary structures and energies were re-calculated after one or two nucleotide substitutions were introduced into the HA 5′-UTR. Phylogenetic trees on the basis of hemagglutinin (HA) and polymerase basic protein 2 (PB2) amino acid sequences and HA 5′-UTR nucleotide sequences were constructed. The connection between the energy and translation efficiency of 5′-UTR was confirmed by in vitro coupled transcription/translation assay.

Results

The simplicity of the secondary structure of the 5′-UTR of the HA gene determines the overall virus replication rate and transmission potential. Point mutation assays show that the 5′-UTR sequences of the HA gene in the influenza subtypes H2N2, H3N2, and H7N9 have greater variation potentials than other virus subtypes.

Conclusion

Some high-virulent strains of avian influenza might emerge in the next two to three years. The H2N2 subtype, once disappeared in humans, may stage a comeback. The current outbreak of H7N9 may become pandemic and cause even more deaths, if one or two bases are substituted in the 5′-UTR sequence of the HA gene.

Electronic supplementary material

The online version of this article (doi:10.1186/s40249-015-0083-8) contains supplementary material, which is available to authorized users.


Url:
DOI: 10.1186/s40249-015-0083-8
PubMed: 26612517
PubMed Central: 4661964


Affiliations:


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


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<term>RNA, Messenger</term>
<term>Viral Proteins</term>
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<term>Influenza, Human</term>
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<term>Animals</term>
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<term>Molecular Sequence Data</term>
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<term>Sequence Alignment</term>
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<div type="abstract" xml:lang="en">
<sec>
<title>Background</title>
<p>In recent years, avian influenza viruses (AIVs) have seriously threatened human health. Questions such as: why do AIVs infect humans?, how quickly can an AIV become pandemic?, and which virus is the most dangerous? cannot be sufficiently answered using current bioinformatic studies.</p>
</sec>
<sec>
<title>Method</title>
<p>Secondary structures and energies of representative 5′-untranslated region (UTR) of the
<italic>HA</italic>
gene were calculated. Then their secondary structures and energies were re-calculated after one or two nucleotide substitutions were introduced into the
<italic>HA</italic>
5′-UTR. Phylogenetic trees on the basis of hemagglutinin (HA) and polymerase basic protein 2 (PB2) amino acid sequences and
<italic>HA</italic>
5′-UTR nucleotide sequences were constructed. The connection between the energy and translation efficiency of 5′-UTR was confirmed by
<italic>in vitro</italic>
coupled transcription/translation assay.</p>
</sec>
<sec>
<title>Results</title>
<p>The simplicity of the secondary structure of the 5′-UTR of the
<italic>HA</italic>
gene determines the overall virus replication rate and transmission potential. Point mutation assays show that the 5′-UTR sequences of the
<italic>HA</italic>
gene in the influenza subtypes H2N2, H3N2, and H7N9 have greater variation potentials than other virus subtypes.</p>
</sec>
<sec>
<title>Conclusion</title>
<p>Some high-virulent strains of avian influenza might emerge in the next two to three years. The H2N2 subtype, once disappeared in humans, may stage a comeback. The current outbreak of H7N9 may become pandemic and cause even more deaths, if one or two bases are substituted in the 5′-UTR sequence of the
<italic>HA</italic>
gene.</p>
</sec>
<sec>
<title>Electronic supplementary material</title>
<p>The online version of this article (doi:10.1186/s40249-015-0083-8) contains supplementary material, which is available to authorized users.</p>
</sec>
</div>
</front>
<back>
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<name sortKey="Tumpey, Tm" uniqKey="Tumpey T">TM Tumpey</name>
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