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Genetic divergence of Chikungunya virus plaque variants from the Comoros Island (2005)

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Abstract

Chikungunya virus (CHIKV) from a human sample collected during the 2005 Chikungunya outbreak in the Comoros Island, showed distinct and reproducible large (L2) and small (S7) plaques which were characterized in this study. The parent strain and plaque variants were analysed by in vitro growth kinetics in different cell lines and their genetic similarity assessed by whole genome sequencing, comparative sequence alignment and phylogenetic analysis. In vitro growth kinetic assays showed similar growth patterns of both plaque variants in Vero cells but higher viral titres of S7 compared to L2 in C6/36 cells. Amino acids (AA) alignments of the CHIKV plaque variants and S27 African prototype strain, showed 30 AA changes in the non-structural proteins (nsP) and 22 AA changes in the structural proteins. Between L2 and S7, only two AAs differences were observed. A missense substitution (C642Y) of L2 in the nsP2, involving a conservative AA substitution and a nonsense substitution (R524X) of S7 in the nsP3, which has been shown to enhance O’nyong-nyong virus infectivity and dissemination in Anopheles mosquitoes. The phenotypic difference observed in plaque size could be attributed to one of these AA substitutions. Phylogenetic analysis showed that the parent strain and its variants clustered closely together with each other and with Indian Ocean CHIKV strains indicating circulation of isolates with close evolutionary relatedness in the same outbreak. These observations pave way for important functional studies to understand the significance of the identified genetic changes in virulence and viral transmission in mosquito and mammalian hosts.

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Acknowledgments

The project was funded by the Consortium for National Health Research (CNHR), Kenya (Project Number RLG09-001/031). This study was also supported with reagents and equipment by JICA-JSPS Project and JICA-JST-SATREPS Project. We acknowledge the Biosciences Eastern and Central Africa - International Livestock Research Institute’s (BecA-ILRI-Hub) genomics platform for supporting the sequencing work. We also appreciate the support given by the Government of the Comoros Island. This work was submitted with the permission of the Director, KEMRI, Nairobi, Kenya.

Author contributions

CW, SI contributed in the laboratory work, data analysis and drafted the manuscript. CR, GM participated in sequencing the variants and data analysis; JK and JO contributed in study design and data analysis. RS and LM contributed to study design, data analysis, overall supervision, implementation and management of the project. All authors reviewed and approved the final manuscript.

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The views expressed are not to be considered as official, or as reflecting the views of USAMRU-K, the Walter Reed Army Institute of Research or the United States Departments of the Army or Defence.

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Correspondence to Caroline Wasonga.

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Edited by Keizo Tomonaga.

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Wasonga, C., Inoue, S., Rumberia, C. et al. Genetic divergence of Chikungunya virus plaque variants from the Comoros Island (2005). Virus Genes 51, 323–328 (2015). https://doi.org/10.1007/s11262-015-1243-4

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