Enhancement of reverse genetics-derived swine-origin H1N1 influenza virus seed vaccine growth by inclusion of indigenous polymerase PB1 protein.

Abstract

The current pandemic of a novel swine-origin H1N1 influenza virus (S-OIV) highlighted the need to urgently develop vaccines that can be used in a rapid response against the pathogen. Reverse genetics has been employed as an alternative means for the generation of influenza seed vaccines. However, reassortant viruses containing 6 internal genes from A/PR/8/34 and the hemagglutinin (HA) and neuraminidase (NA) genes from S-OIV showed very slow growth characteristics, hampering the speed of vaccine production. Here, we showed that the reverse genetics-derived H1N1 could be rescued with sensible viral titer by replacing PB1 of A/PR/8/34 with that of S-OIV for plasmid transfection. The "5+3" reassortant viruses have shown higher growth rate after transfection compared to that of "6+2" reassortant. The difference between PB1 of S-OIV and that of A/PR/8/34 in terms of the enhancement of virus growth was possibly due to the augmentation of viral polymerase activity, but not the lack of functional PB1-F2. Furthermore, it was found that growth enhancement by PB1 was specific for reassortant harboring HA of S-OIV, suggesting that the slow growth property of S-OIV reassortant virus is possibly due to restrictions imposed by the HA gene.

DOI: 10.1016/j.virusres.2009.10.010
05010020102011201220132014201520162017
Citations per Year

149 Citations

Semantic Scholar estimates that this publication has 149 citations based on the available data.

See our FAQ for additional information.

Cite this paper

@article{Wanitchang2010EnhancementOR, title={Enhancement of reverse genetics-derived swine-origin H1N1 influenza virus seed vaccine growth by inclusion of indigenous polymerase PB1 protein.}, author={Asawin Wanitchang and Jarin Kramyu and Anan Jongkaewwattana}, journal={Virus research}, year={2010}, volume={147 1}, pages={145-8} }