Mutation Analysis of 2009 Pandemic Influenza A(H1N1) Viruses in Japan
Author Information
Author(s): Morlighem Jean-Étienne, Aoki Shintaro, Kishima Mami, Hanami Mitsue, Ogawa Chihiro, Jalloh Amadu, Takahashi Yukari, Kawai Yuki, Saga Satomi, Hayashi Eiji, Ban Toshiaki, Izumi Shinyu, Wada Akira, Mano Masayuki, Fukunaga Megumu, Kijima Yoshiyuki, Shiomi Masashi, Inoue Kaoru, Hata Takeshi, Koretsune Yukihiro, Kudo Koichiro, Himeno Yuji, Hirai Aizan, Takahashi Kazuo, Sakai-Tagawa Yuko, Iwatsuki-Horimoto Kiyoko, Kawaoka Yoshihiro, Hayashizaki Yoshihide, Ishikawa Toshihisa
Primary Institution: Omics Science Center, RIKEN Yokohama Institute, Yokohama, Japan
Hypothesis
How did the 2009 pandemic H1N1 influenza virus evolve in Japan during the peak phase of the pandemic?
Conclusion
The study found significant mutations in the H1N1 virus, indicating rapid evolution and the emergence of new micro-clades during the pandemic.
Supporting Evidence
- Two major mutations, HA-S220T and NA-N248D, were identified as significant in differentiating virus samples from early and peak phases.
- Phylogenetic analysis revealed 14 micro-clades, with 12 being newly identified during the peak phase.
- Oseltamivir resistance-related mutations were detected in sporadic cases.
Takeaway
Scientists looked at samples of the H1N1 virus from Japan and found that it changed a lot during the pandemic, which helps us understand how viruses can evolve quickly.
Methodology
The study collected 253 swab samples from patients and analyzed the hemagglutinin and neuraminidase genes of the influenza virus using phylogenetic analysis.
Limitations
The study only analyzed partial sequences of the influenza genome, which may not capture all mutations.
Participant Demographics
Samples were collected from patients with influenza-like illness in Osaka, Tokyo, and Chiba areas.
Digital Object Identifier (DOI)
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