Experimental cross-species infection of donkeys with equine hepacivirus and analysis of host immune signatures.
Journal
One health outlook
ISSN: 2524-4655
Titre abrégé: One Health Outlook
Pays: England
ID NLM: 101769253
Informations de publication
Date de publication:
09 May 2022
09 May 2022
Historique:
received:
10
11
2021
accepted:
06
04
2022
entrez:
8
5
2022
pubmed:
9
5
2022
medline:
9
5
2022
Statut:
epublish
Résumé
The Equine Hepacivirus (EqHV) is an equine-specific and liver-tropic virus belonging to the diverse genus of Hepaciviruses. It was recently found in a large donkey (Equus asinus) cohort with a similar seroprevalence (30%), but lower rate of RNA-positive animals (0.3%) compared to horses. These rare infection events indicate either a lack of adaptation to the new host or a predominantly acute course of infection. In order to analyze the susceptibility and the course of EqHV infection in donkeys, we inoculated two adult female donkeys and one control horse intravenously with purified EqHV from a naturally infected horse. Liver biopsies were taken before and after inoculation to study changes in the transcriptome. Infection kinetics were similar between the equids. All animals were EqHV PCR-positive from day three. EqHV RNA-levels declined when the animals seroconverted and both donkeys cleared the virus from the blood by week 12. Infection did not have an impact on the clinical findings and no significant histopathological differences were seen. Blood biochemistry revealed a mild increase in GLDH at the time of seroconversion in horses, which was less pronounced in donkeys. Transcriptomic analysis revealed a distinct set of differentially expressed genes, including viral host factors and immune genes. To summarize, our findings indicate that donkeys are a natural host of EqHV, due to the almost identical infection kinetics. The different immune responses do however suggest different mechanisms in reacting to hepaciviral infections.
Sections du résumé
BACKGROUND
BACKGROUND
The Equine Hepacivirus (EqHV) is an equine-specific and liver-tropic virus belonging to the diverse genus of Hepaciviruses. It was recently found in a large donkey (Equus asinus) cohort with a similar seroprevalence (30%), but lower rate of RNA-positive animals (0.3%) compared to horses. These rare infection events indicate either a lack of adaptation to the new host or a predominantly acute course of infection.
METHODS
METHODS
In order to analyze the susceptibility and the course of EqHV infection in donkeys, we inoculated two adult female donkeys and one control horse intravenously with purified EqHV from a naturally infected horse. Liver biopsies were taken before and after inoculation to study changes in the transcriptome.
RESULTS
RESULTS
Infection kinetics were similar between the equids. All animals were EqHV PCR-positive from day three. EqHV RNA-levels declined when the animals seroconverted and both donkeys cleared the virus from the blood by week 12. Infection did not have an impact on the clinical findings and no significant histopathological differences were seen. Blood biochemistry revealed a mild increase in GLDH at the time of seroconversion in horses, which was less pronounced in donkeys. Transcriptomic analysis revealed a distinct set of differentially expressed genes, including viral host factors and immune genes.
CONCLUSION
CONCLUSIONS
To summarize, our findings indicate that donkeys are a natural host of EqHV, due to the almost identical infection kinetics. The different immune responses do however suggest different mechanisms in reacting to hepaciviral infections.
Identifiants
pubmed: 35527255
doi: 10.1186/s42522-022-00065-y
pii: 10.1186/s42522-022-00065-y
pmc: PMC9082851
doi:
Types de publication
Journal Article
Langues
eng
Pagination
9Subventions
Organisme : Deutsche Forschungsgemeinschaft
ID : 398066876-GRK 2485/1
Organisme : Deutsche Forschungsgemeinschaft
ID : STE1954/6-1
Informations de copyright
© 2022. The Author(s).
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