Improvement of influenza vaccine strain A/Vietnam/1194/2004 (H5N1) growth with the neuraminidase packaging sequence from A/Puerto Rico/8/34.

Abstract:

:H5N1 influenza candidate vaccine viruses were developed using the "6+2" approach. The hemagglutinin (HA) and neuraminidase (NA) genes were derived from the popular H5N1 virus and the remaining six internal segments were derived from the A/Puerto Rico/8/34 strain (H1N1, PR8). However, some of these candidate strains have been reported to produce relatively low yields in vaccine manufacture. In this study, we found that the NA vRNA of the A/Vietnam/1194/2004 strain (H5N1, VN1194) was poorly packaged into recombinant viruses with a backbone of PR8 genes, which resulted in the formation of defective virions that did not include the NA vRNA in the genome. Using recombinant DNA techniques, we constructed a chimeric NA gene with the coding region of VN1194 NA flanked by the packaging signal sequence of the PR8 NA gene (41 bp form the 3' end of the vRNA and 67 bp from the 5' end). The packaging of the NA vRNA was restored to normal levels in the recombinant viruses containing the chimeric NA gene. Recombinant viruses containing the chimeric NA replicated much better in chicken embryonated eggs than viruses with the wild-type NA from VN1194. These findings suggest a novel strategy to improve in ovo growth of vaccine strains and to increase the number of vaccine doses available to save people if a pandemic were to occur.

journal_name

Hum Vaccin Immunother

authors

Pan W,Dong Z,Meng W,Zhang W,Li T,Li C,Zhang B,Chen L

doi

10.4161/hv.18468

subject

Has Abstract

pub_date

2012-02-01 00:00:00

pages

252-9

issue

2

eissn

2164-5515

issn

2164-554X

pii

18468

journal_volume

8

pub_type

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