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http://ir.nhri.org.tw/handle/3990099045/12107
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| Title: | Naturally occurring mutations in PB1 affect influenza A virus replication fidelity, virulence, and adaptability |
| Authors: | Lin, RW;Chen, GW;Sung, HH;Lin, RJ;Yen, LC;Tseng, YL;Chang, YK;Lien, SP;Shih, SR;Liao, CL |
| Contributors: | National Institute of Infectious Diseases and Vaccinology;National Mosquito-Borne Diseases Control Research Center |
| Abstract: | BACKGROUND: Mutations in the PB1 subunit of RNA-dependent RNA polymerase (RdRp) of influenza A virus can affect replication fidelity. Before the influenza A/H1N1 pandemic in 2009, most human influenza A/H1N1 viruses contained the avian-associated residue, serine, at position 216 in PB1. However, near the onset of the 2009 pandemic, human viruses began to acquire the mammalian-associated residue, glycine, at PB1-216, and PB1-216G became predominant in human viruses thereafter. METHODS: Using entropy-based analysis algorithm, we have previously identified several host-specific amino-acid signatures that separated avian and swine viruses from human influenza viruses. The presence of these host-specific signatures in human influenza A/H1N1 viruses suggested that these mutations were the result of adaptive genetic evolution that enabled these influenza viruses to circumvent host barriers, which resulted in cross-species transmission. We investigated the biological impact of this natural avian-to-mammalian signature substitution at PB1-216 in human influenza A/H1N1 viruses. RESULTS: We found that PB1-216G viruses had greater mutation potential, and were more sensitive to ribavirin than PB1-216S viruses. In oseltamivir-treated HEK293 cells, PB1-216G viruses generated mutations in viral neuraminidase at a higher rate than PB1-216S viruses. By contrast, PB1-216S viruses were more virulent in mice than PB1-216G viruses. These results suggest that the PB1-S216G substitution enhances viral epidemiological fitness by increasing the frequency of adaptive mutations in human influenza A/H1N1 viruses. CONCLUSIONS: Our results thus suggest that the increased adaptability and epidemiological fitness of naturally arising human PB1-216G viruses, which have a canonical low-fidelity replicase, were the biological mechanisms underlying the replacement of PB1-216S viruses with a high-fidelity replicase following the emergence of pdmH1N1. We think that continued surveillance of such naturally occurring PB1-216 variants among others is warranted to assess the potential impact of changes in RdRp fidelity on the adaptability and epidemiological fitness of human A/H1N1 influenza viruses. |
| Date: | 2019-07-31 |
| Relation: | Journal of Biomedical Science. 2019 Jul 31;26:Article number 55. |
| Link to: | http://dx.doi.org/10.1186/s12929-019-0547-4 |
| JIF/Ranking 2023: | http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=1021-7770&DestApp=IC2JCR |
| Cited Times(WOS): | https://www.webofscience.com/wos/woscc/full-record/WOS:000478069800001 |
| Cited Times(Scopus): | https://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85070855408 |
| Appears in Collections: | [廖經倫] 期刊論文
[其他] 期刊論文
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| PUB31366399.pdf | | 2060Kb | Adobe PDF | 345 | View/Open |
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