Quantification of intrahost bottlenecks of West Nile virus in Culex pipiens mosquitoes using an artificial mutant swarm.
Mosquito-borne viruses are predominantly RNA viruses which exist within hosts as diverse mutant swarms. Defining the way in which stochastic forces within mosquito vectors shape these swarms is critical to advancing our understanding of the evolutionary and adaptive potential of these pathogens. There are multiple barriers within a mosquito which a viral swarm must traverse in order to ultimately be transmitted. Here, using artificial mutant swarms composed of neutral variants of West Nile virus (WNV), we tracked changes to swarm breadth over time and space in Culex pipiens mosquitoes. Our results demonstrate that all variants have the potential to survive intrahost bottlenecks, yet mean swarm breadth decreases during both midgut infection and transmission when starting populations contain higher levels of minority variants. In addition, WNV swarms are subject to temporal sweeps which act to significantly decrease intrahost diversity over time. Taken together, these data demonstrate the profound effects that stochastic forces can have in shaping arboviral mutant swarms.
Wadsworth Center, New York State Department of Health, Slingerlands, NY, United States.
Alexander T
AT
Ciota
Dylan J
DJ
Ehrbar
Greta A
GA
Van Slyke
Anne F
AF
Payne
Graham G
GG
Willsey
Rachael E
RE
Viscio
Laura D
LD
Kramer
D000220:Adaptation, Biological; D000818:Animals; D002522:Chlorocebus aethiops; D003001:Cloning, Molecular; D003465:Culex / Q000254:growth & development / Q000502:physiology / Q000821:virology*; D004279:DNA, Viral / Q000235:genetics; D019143:Evolution, Molecular; D005247:Feeding Behavior; D054884:Host-Pathogen Interactions; D007303:Insect Vectors / Q000821:virology*; D012469:Salivary Glands / Q000821:virology; D013269:Stochastic Processes; D013997:Time Factors; D014709:Vero Cells; D019562:Viral Load; D014779:Virus Replication; D014902:West Nile virus / Q000235:genetics* / Q000254:growth & development / Q000472:pathogenicity / Q000502:physiology
D004279:DNA, Viral