Article ; Online: The impact of PA/I38 substitutions and PA polymorphisms on the susceptibility of zoonotic influenza A viruses to baloxavir.
2024 Volume 169, Issue 2, Page(s) 29
Abstract: Genetic reassortment of avian, swine, and human influenza A viruses (IAVs) poses potential pandemic risks. Surveillance is important for influenza pandemic preparedness, but the susceptibility of zoonotic IAVs to the cap-dependent endonuclease inhibitor ... ...
Abstract | Genetic reassortment of avian, swine, and human influenza A viruses (IAVs) poses potential pandemic risks. Surveillance is important for influenza pandemic preparedness, but the susceptibility of zoonotic IAVs to the cap-dependent endonuclease inhibitor baloxavir acid (BXA) has not been thoroughly researched. Although an amino acid substitution at position 38 in the polymerase acidic protein (PA/I38) in seasonal IAVs reduces BXA susceptibility, PA polymorphisms at position 38 are rarely seen in zoonotic IAVs. Here, we examined the impact of PA/I38 substitutions on the BXA susceptibility of recombinant A(H5N1) viruses. PA mutants that harbored I38T, F, and M were 48.2-, 24.0-, and 15.5-fold less susceptible, respectively, to BXA than wild-type A(H5N1) but were susceptible to the neuraminidase inhibitor oseltamivir acid and the RNA polymerase inhibitor favipiravir. PA mutants exhibited significantly impaired replicative fitness in Madin-Darby canine kidney cells at 24 h postinfection. In addition, in order to investigate new genetic markers for BXA susceptibility, we screened geographically and temporally distinct IAVs isolated worldwide from birds and pigs. The results showed that BXA exhibited antiviral activity against avian and swine viruses with similar levels to seasonal isolates. All viruses tested in the study lacked the PA/I38 substitution and were susceptible to BXA. Isolates harboring amino acid polymorphisms at positions 20, 24, and 37, which have been implicated in the binding of BXA to the PA endonuclease domain, were also susceptible to BXA. These results suggest that monitoring of the PA/I38 substitution in animal-derived influenza viruses is important for preparedness against zoonotic influenza virus outbreaks. |
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MeSH term(s) | Animals ; Dogs ; Humans ; Swine ; Influenza A virus/genetics ; Oxazines/pharmacology ; Pyridines/pharmacology ; Pyridines/therapeutic use ; Influenza A Virus, H5N1 Subtype/genetics ; Thiepins/pharmacology ; Thiepins/therapeutic use ; Influenza, Human ; Antiviral Agents/pharmacology ; Antiviral Agents/therapeutic use ; Orthomyxoviridae/genetics ; Enzyme Inhibitors/pharmacology ; Enzyme Inhibitors/therapeutic use ; Amino Acid Substitution ; Endonucleases/genetics ; Drug Resistance, Viral/genetics ; Dibenzothiepins ; Morpholines ; Pyridones ; Triazines |
Chemical Substances | baloxavir (4G86Y4JT3F) ; Oxazines ; Pyridines ; Thiepins ; Antiviral Agents ; Enzyme Inhibitors ; Endonucleases (EC 3.1.-) ; Dibenzothiepins ; Morpholines ; Pyridones ; Triazines |
Language | English |
Publishing date | 2024-01-12 |
Publishing country | Austria |
Document type | Journal Article |
ZDB-ID | 7491-3 |
ISSN | 1432-8798 ; 0304-8608 |
ISSN (online) | 1432-8798 |
ISSN | 0304-8608 |
DOI | 10.1007/s00705-023-05958-5 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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