Evolution and epidemiologic dynamics of dengue virus in Nicaragua during the emergence of chikungunya and Zika viruses

• Published in: Infection, genetics and evolution Vol. 92; p. 104680
• Main Authors: Edgerton, Sean V., Thongsripong, Panpim, Wang, Chunling, Montaya, Magelda, Balmaseda, Angel, Harris, Eva, Bennett, Shannon N.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.08.2021
• Subjects: Aedes - virology; Animals; Arbovirus Infections - epidemiology; Arbovirus Infections - virology; Arboviruses - genetics; Chikungunya Fever - epidemiology; Chikungunya Fever - virology; Chikungunya virus; Chikungunya virus - genetics; Coinfection - epidemiology; Coinfection - virology; Dengue - epidemiology; Dengue - virology; Dengue virus; Dengue Virus - genetics; Disease Outbreaks; Evolution; Humans; Mosquito Vectors - virology; Nicaragua; Nicaragua - epidemiology; Phylogenetics; Phylogeny; Positive selection; Zika Virus - genetics; Zika Virus Infection - epidemiology; Zika Virus Infection - virology; Nicaragua; Phylogenetics; Evolution; Nicaragua; Dengue virus; Positive selection; Chikungunya virus
• ISSN: 1567-1348; 1567-7257
• DOI: 10.1016/j.meegid.2020.104680

Arthropod-borne viruses (arboviruses) comprise a significant and ongoing threat to human health, infecting hundreds of millions annually. Three such arboviruses include circumtropical dengue, Zika, and chikungunya viruses, exhibiting continuous emergence primarily via Aedes mosquito vectors. Nicaragua has experienced endemic dengue virus (DENV) transmission involving multiple serotypes since 1985, with chikungunya virus (CHIKV) reported in 2014–2015, followed by Zika virus (ZIKV) first reported in 2016. In order to identify patterns of genetic variation and selection pressures shaping the evolution of co-circulating DENV serotypes in light of the arrival of CHIKV and ZIKV, we employed whole-genome sequencing on an Illumina MiSeq platform of random-amplified total RNA libraries to characterize 42 DENV low-passage isolates, derived from viremic patients in Nicaragua between 2013 and 2016. Our approach also revealed clinically undetected co-infections with CHIKV. Of the three DENV serotypes (1, 2, and 3) co-circulating during our study, we uncovered distinct patterns of evolution using comparative phylogenetic inference. DENV-1 genetic variation was structured into two distinct co-circulating lineages with no evidence of positive selection in the origins of either lineage, suggesting they are equally fit. In contrast, the evolutionary history of DENV-2 was marked by positive selection, and a unique, divergent lineage correlated with high epidemic potential emerged in 2015 to drive an outbreak in 2016. DENV-3 genetic variation remained unstructured into lineages throughout the period of study. Thus, this study reveals insights into evolutionary and epidemiologic trends exhibited during the circulation of multiple arboviruses in Nicaragua. •42 dengue virus (DENV) isolates serotype 1-3 from viremic Nicaraguan patients (2013-2016) were sequenced and analyzed.•Three clinically undetected co-infections with chikungunya virus (CHIKV) were confirmed with high genome coverage.•DENV-1 isolates structured into two lineages with no evidence of positive selection suggesting they are equally fit.•DENV-2 evolution was marked by positive selection with a divergent lineage of high epidemic potential emerged in 2015.•DENV-3 isolates remained unstructured into lineages throughout the period of study. No evidence of positive selection.