1887

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Volume 102, Issue 12

Chikungunya virus produced by a persistently infected mosquito cell line comprises a shorter genome and is non-infectious to mammalian cells Free

Abstract

Although RNA viruses have high mutation rates, host cells and organisms work as selective environments, maintaining the viability of virus populations by eliminating deleterious genotypes. In serial passages of RNA viruses in a single cell line, most of these selective bottlenecks are absent, with no virus circulation and replication in different tissues or host alternation. In this work, Aag-2 cells were accidentally infected with Chikungunya virus (CHIKV) and Mayaro virus (MAYV). After numerous passages to achieve infection persistency, the infectivity of these viruses was evaluated in C6/36 cells, African green monkey Vero cells and primary-cultured human fibroblasts. While these CHIKV and MAYV isolates were still infectious to mosquito cells, they lost their ability to infect mammalian cells. After genome sequencing, it was observed that CHIKV accumulated many nonsynonymous mutations and a significant deletion in the coding sequence of the hypervariable domain in the gene. Since MAYV showed very low titres, it was not sequenced successfully. Persistently infected Aag-2 cells also accumulated high loads of short and recombinant CHIKV RNAs, which seemed to have been originated from virus-derived DNAs. In conclusion, the genome of this CHIKV isolate could guide mutagenesis strategies for the production of attenuated or non-infectious (to mammals) CHIKV vaccine candidates. Our results also reinforce that a paradox is expected during passages of cells persistently infected by RNA viruses: more loosening for the development of more diverse virus genotypes and more pressure for virus specialization to this constant cellular environment.

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  • Accepted:
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Keyword(s): Aag-2 , Aedes aegypti , Chikungunya virus , Mayaro virus , recombinant viral RNA and vaccine candidate
Funding
This study was supported by the:
  • Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
    • Principle Award Recipient: BergmannM. Ribeiro
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico
    • Principle Award Recipient: RenatoO. Resende
  • Fundação de Apoio à Pesquisa do Distrito Federal
    • Principle Award Recipient: RenatoO. Resende
© 2021 The Authors
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2021-12-08
2024-12-08
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Chikungunya virus produced by a persistently infected mosquito cell line comprises a shorter genome and is non-infectious to mammalian cells
J. Gen. Virol. 102, 001700 (2021); https://doi.org/10.1099/jgv.0.001700
/content/journal/jgv/10.1099/jgv.0.001700
/content/journal/jgv/10.1099/jgv.0.001700
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