Abstract
Zika virus (ZIKV) is an arbovirus maintained in nature in two distinct cycles of transmission: urban and sylvatic. Each cycle includes specific vertebrate and invertebrate hosts, and through alternate infections, a conserved consensus sequence is maintained that might vary depending on the cycle. The current study aimed to investigate the ability of ZIKVAF and ZIKVBR to maintain an infectious cycle by alternating passages in cells mimicking the urban (UC) and semi-sylvatic (SC) cycles. The complete genome of the original inoculum and the last passages for each cycle were sequenced by Sanger. Ten passages were performed, as planned, for ZIKVBR UC, ZIKVAF SC, and ZIKVBR SC. ZIKVBR SC showed significant variation in viral titers along the passages, suggesting that the virus is not well adapted to the non-human primate host. ZIKVAF passage in UC was abrogated in the third passage, showing the inability of the African lineage to sustain cycles in human cells, suggesting a low capacity to establish an urban cycle. Several mutations were found in both strains along the passages, but not occurring at equivalent positions. Further studies are needed to elucidate whether any of these specific mutations affect viral fitness.
Graphical Abstract
ZIKV strains behave differently in artificial transmission cycles in vitro: Brazilian ZIKV was able to establish urban and semi-sylvatic cycles in vitro. African ZIKV proved unable to cycle among human and mosquito cells and is compatible only with the semi-sylvatic cycle. The main mutations arose in the NS2A region after artificial transmission cycles for both ZIKV strains but not at equivalent positions.
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Data availability
The data that support the findings of this study are openly available in GenBank, reference numbers OK569755, OK569756, OK569757, OK569758, OK569759, and OK569760, and in the supplementary material of this article.
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This work is supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brazil (CAPES) Finance Code 001.
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M. N. B. conceived the study. All authors designed the study. B. F. M., N. N. M., and C. B. performed the experiments and were involved in the acquisition and analysis of the data; all authors were involved in the interpretation of the data. B. F. M. and N. N. M. wrote the manuscript with input from all authors.
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Supplementary Information
Table 1 Primers used in the nested-PCR reaction to amplify the complete virus genome. Start and stop sites are based on ZIKV Brazilian strain reference sequence (GenBank NC_035889.1). Primers P4-5F/R and N4-5F/R were only needed for African ZIKV complete genome amplification
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Molina, B.F., Marques, N.N., Bittar, C. et al. African ZIKV lineage fails to sustain infectivity in an in vitro mimetic urban cycle. Braz J Microbiol 54, 1421–1431 (2023). https://doi.org/10.1007/s42770-023-01053-8
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DOI: https://doi.org/10.1007/s42770-023-01053-8