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Significance of the Myxovirus Resistance A (MxA) Gene — 123C>A Single-Nucleotide Polymorphism in Suppressed Interferon β Induction of Severe Acute Respiratory Syndrome Coronavirus Infection

Identifieur interne : 000097 ( Psycho/Analysis ); précédent : 000096; suivant : 000098

Significance of the Myxovirus Resistance A (MxA) Gene — 123C>A Single-Nucleotide Polymorphism in Suppressed Interferon β Induction of Severe Acute Respiratory Syndrome Coronavirus Infection

Auteurs : Johannes Chi-Yun Ching [Hong Kong] ; Kelvin Yuen Kwong Chan [Hong Kong] ; Eric Hing Leung Lee [Hong Kong] ; Mei-Shu Xu [Hong Kong] ; Campbell Kam Po Ting [Hong Kong] ; Thomas M. K. So [Hong Kong] ; Pak C. Sham [Hong Kong] ; Gabriel M. Leung [Hong Kong] ; Joseph S. M. Peiris [Hong Kong] ; Ui-Soon Khoo [Hong Kong]

Source :

RBID : ISTEX:81408923A5DE78EDAA06125446DD74456EE764EC

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English descriptors

Abstract

Myxovirus resistance A (MxA) is an antiviral protein induced by interferon α and β (IFN-α, IFN-β) that can inhibit viral replication. The minor alleles of the -88G>T and -123C>A MxA promoter single-nucleotide polymorphisms (SNPs) are associated with increased promoter activity and altered response to IFN-α and IFN-β treatment. Here, we demonstrate that the 123A minor allele provided stronger binding affinity to nuclear proteins extracted from IFN-β-untreated cells than did the wild-type allele, whereas the -88T allele showed preferential binding after IFN-β stimulation. Endogenous IFN-α and IFN-β induction can be suppressed in severe acute respiratory syndrome (SARS) coronavirus infection. In support of our in vitro findings, a large case-control genetic-association study for SARS coronavirus infection confirmed that the -123A minor-allele carriers were significantly associated with lower risk of SARS coronavirus infection, whereas the -88T minorallele carriers were insignificant after adjustment for confounding effects. This suggests that -123C>A plays a more important role in modulating basal MxA expression, thus contributing more significantly to innate immune response against viral infections that suppress endogenous IFN-α and IFN-β induction such as SARS coronavirus.

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DOI: 10.1086/652799


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<term>Adolescent</term>
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<term>Aged</term>
<term>Aged, 80 and over</term>
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<front>
<div type="abstract">Myxovirus resistance A (MxA) is an antiviral protein induced by interferon α and β (IFN-α, IFN-β) that can inhibit viral replication. The minor alleles of the -88G>T and -123C>A MxA promoter single-nucleotide polymorphisms (SNPs) are associated with increased promoter activity and altered response to IFN-α and IFN-β treatment. Here, we demonstrate that the 123A minor allele provided stronger binding affinity to nuclear proteins extracted from IFN-β-untreated cells than did the wild-type allele, whereas the -88T allele showed preferential binding after IFN-β stimulation. Endogenous IFN-α and IFN-β induction can be suppressed in severe acute respiratory syndrome (SARS) coronavirus infection. In support of our in vitro findings, a large case-control genetic-association study for SARS coronavirus infection confirmed that the -123A minor-allele carriers were significantly associated with lower risk of SARS coronavirus infection, whereas the -88T minorallele carriers were insignificant after adjustment for confounding effects. This suggests that -123C>A plays a more important role in modulating basal MxA expression, thus contributing more significantly to innate immune response against viral infections that suppress endogenous IFN-α and IFN-β induction such as SARS coronavirus.</div>
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