Migné, Camille Victoire, Heckmann, Aurélie, Monsion, Baptiste, Mohd Jaafar, Fauziah, Galon, Clémence, Rakotobe, Sabine, Bell-Sakyi, Lesley, Moutailler, Sara and Attoui, Houssam
(2024)
Age- and Sex-Associated Pathogenesis of Cell Culture-Passaged Kemerovo Virus in IFNAR<sup>(-/-)</sup> Mice.
International journal of molecular sciences, 25 (6).
p. 3177.
Abstract
Kemerovo virus (KEMV) is a tick-borne orbivirus transmitted by ticks of the genus <i>Ixodes</i>. Previous animal experimentation studies with orbiviruses, in particular the interferon receptor double knock-out (IFNAR<sup>(-/-)</sup>) mouse model, did not indicate bias that is related to age or sex. We endeavoured to assess the effect of serial and alternated passages of KEMV in mammalian or <i>Ixodes</i> cells on virus replication and potential virulence in male or female IFNAR<sup>(-/-)</sup> mice, with important age differences: younger males (4-5 months old), older males (14-15 months old), and old females (14-15 months old). After 30 serial passages in mammalian or tick cells, or alternated passages in the two cell types, older female mice which were inoculated with the resulting virus strains were the first to show clinical signs and die. Younger males behaved differently from older males whether they were inoculated with the parental strain of KEMV or with any of the cell culture-passaged strains. The groups of male and female mice inoculated with the mammalian cell culture-adapted KEMV showed the lowest viraemia. While older female and younger male mice died by day 6 post-inoculation, surprisingly, the older males survived until the end of the experiment, which lasted 10 days. RNA extracted from blood and organs of the various mice was tested by probe-based KEMV real-time RT-PCR. Ct values of the RNA extracts were comparable between older females and younger males, while the values for older males were >5 Ct units higher for the various organs, indicating lower levels of replication. It is noteworthy that the hearts of the old males were the only organs that were negative for KEMV RNA. These results suggest, for the first time, an intriguing age- and sex-related bias for an orbivirus in this animal model. Changes in the amino acid sequence of the RNA-dependent RNA polymerase of Kemerovo virus, derived from the first serial passage in <i>Ixodes</i> cells (KEMV Ps.IRE1), were identified in the vicinity of the active polymerase site. This finding suggests that selection of a subpopulation of KEMV with better replication fitness in tick cells occurred.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Animals, Mammals, Mice, Ixodes, Orbivirus, RNA, Viral, Cell Culture Techniques, Amino Acid Sequence, Female, Male |
| Divisions: | Faculty of Health and Life Sciences Faculty of Health and Life Sciences > Institute of Infection, Veterinary and Ecological Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 23 Apr 2024 08:20 |
| Last Modified: | 23 Apr 2024 08:21 |
| DOI: | 10.3390/ijms25063177 |
| Open Access URL: | https://doi.org/10.3390/ijms25063177 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3180501 |
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