Giuseppe
Emeritus
Arch Virol. 2009 Nov 28. [Epub ahead of print]
Readaptation of a low-virulence influenza H9 escape mutant in mice: the role of changes in hemagglutinin as revealed by site-specific mutagenesis.
Ilyushina NA, Rudneva IA, Khalenkov AM, Timofeeva TA, Krylov PS, Webster RG, Kaverin NV. - The D.I. Ivanovsky Institute of Virology, 16 Gamaleya Str., 123098, Moscow, Russia.
In our earlier studies, we showed that an escape mutant of mouse-adapted H9N2 influenza virus carrying a T198N amino acid change in heamagglutinin (HA) has a lowered virulence for mice. The readaptation of this mutant to mice was associated with N198S or N198D reverse mutations. In this study, single-gene reassortants having HA gene of the wild-type virus, its low-virulence escape mutant, or a readapted variant were generated by site-specific mutagenesis and assayed for virulence. The results showed that antibody-selected mutations in the HA of H9 influenza virus can decrease mortality and virus accumulation in mouse lungs, though not in nasal turbinates, and the effect may be compensated by reverse mutations in the course of passaging.
PMID: 19946717 [PubMed - as supplied by publisher]
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Readaptation of a low-virulence influenza H9 escape mutant in mice: the role of changes in hemagglutinin as revealed by site-specific mutagenesis.
Ilyushina NA, Rudneva IA, Khalenkov AM, Timofeeva TA, Krylov PS, Webster RG, Kaverin NV. - The D.I. Ivanovsky Institute of Virology, 16 Gamaleya Str., 123098, Moscow, Russia.
In our earlier studies, we showed that an escape mutant of mouse-adapted H9N2 influenza virus carrying a T198N amino acid change in heamagglutinin (HA) has a lowered virulence for mice. The readaptation of this mutant to mice was associated with N198S or N198D reverse mutations. In this study, single-gene reassortants having HA gene of the wild-type virus, its low-virulence escape mutant, or a readapted variant were generated by site-specific mutagenesis and assayed for virulence. The results showed that antibody-selected mutations in the HA of H9 influenza virus can decrease mortality and virus accumulation in mouse lungs, though not in nasal turbinates, and the effect may be compensated by reverse mutations in the course of passaging.
PMID: 19946717 [PubMed - as supplied by publisher]
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