Dynamic PB2-E627K substitution of influenza H7N9 virus indicates the in vivo genetic tuning and rapid host adaptation.
Adaptation, Biological
/ genetics
Amino Acid Substitution
/ genetics
High-Throughput Nucleotide Sequencing
Host-Pathogen Interactions
Humans
Influenza A Virus, H7N9 Subtype
/ genetics
Influenza, Human
/ virology
RNA, Viral
/ genetics
RNA-Dependent RNA Polymerase
/ genetics
Sequence Analysis, RNA
Viral Proteins
/ genetics
Virus Replication
/ genetics
H7N9 virus
PB2-627
dynamic substitution
host adaptation
next-generation sequencing
Journal
Proceedings of the National Academy of Sciences of the United States of America
ISSN: 1091-6490
Titre abrégé: Proc Natl Acad Sci U S A
Pays: United States
ID NLM: 7505876
Informations de publication
Date de publication:
22 09 2020
22 09 2020
Historique:
pubmed:
3
9
2020
medline:
18
11
2020
entrez:
3
9
2020
Statut:
ppublish
Résumé
Avian-origin influenza viruses overcome the bottleneck of the interspecies barrier and infect humans through the evolution of variants toward more efficient replication in mammals. The dynamic adaptation of the genetic substitutions and the correlation with the virulence of avian-origin influenza virus in patients remain largely elusive. Here, based on the one-health approach, we retrieved the original virus-positive samples from patients with H7N9 and their surrounding poultry/environment. The specimens were directly deep sequenced, and the subsequent big data were integrated with the clinical manifestations. Unlike poultry/environment-derived samples with the consistent dominance of avian signature 627E of H7N9 polymerase basic protein 2 (PB2), patient specimens had diverse ratios of mammalian signature 627K, indicating the rapid dynamics of H7N9 adaptation in patients during the infection process. In contrast, both human- and poultry/environment-related viruses had constant dominance of avian signature PB2-701D. The intrahost dynamic adaptation was confirmed by the gradual replacement of 627E by 627K in H7N9 in the longitudinally collected specimens from one patient. These results suggest that host adaptation for better virus replication to new hosts, termed "genetic tuning," actually occurred in H7N9-infected patients in vivo. Notably, our findings also demonstrate the correlation between rapid host adaptation of H7N9 PB2-E627K and the fatal outcome and disease severity in humans. The feature of H7N9 genetic tuning in vivo and its correlation with the disease severity emphasize the importance of testing for the evolution of this avian-origin virus during the course of infection.
Identifiants
pubmed: 32873642
pii: 2013267117
doi: 10.1073/pnas.2013267117
pmc: PMC7519270
doi:
Substances chimiques
PB2 protein, Influenzavirus A
0
RNA, Viral
0
Viral Proteins
0
RNA-Dependent RNA Polymerase
EC 2.7.7.48
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
23807-23814Informations de copyright
Copyright © 2020 the Author(s). Published by PNAS.
Déclaration de conflit d'intérêts
Competing interest statement: T.J., L. Li., G.L., and H.J. were employees of BGI-Shenzhen during the project.
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