Phylogenetic characterization of Central/Southern European lineage 2 West Nile virus: analysis of human outbreaks in Italy and Greece, 2013-2014

L. Barzon, A. Papa, E. Lavezzo, E. Franchin, M. Pacenti, A. Sinigaglia, G. Masi, M. Trevisan, L. Squarzon, S. Toppo, E. Papadopoulou, N. Nowotny, S. Ulbert, A. Piralla, F. Rovida, F. Baldanti, E. Percivalle, G. Palù

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Abstract

In recent years, West Nile virus (WNV) lineage 2 has been spreading and causing disease outbreaks in humans and animals in Europe. In order to characterize viral diversity, we performed full-length genome sequencing of WNV lineage 2 from human samples collected during outbreaks in Italy and Greece in 2013 and 2014. Phylogenetic analysis showed that these WNV lineage 2 genomes belonged to a monophyletic clade derived from a single introduction into Europe of the prototype Hungarian strain. Correlation of phylogenetic data with geospatial information showed geographical clustering of WNV genome sequences both in Italy and in Greece, indicating that the virus had evolved and diverged during its dispersal in Europe, leading to the emergence of novel genotypes, as it adapted to local ecological niches. These genotypes carried divergent conserved amino acid substitutions, which might have been relevant for viral adaptation, as suggested by selection pressure analysis and in silico and experimental modelling of sequence changes. In conclusion, the results of this study provide further information on WNV lineage 2 transmission dynamics in Europe, and emphasize the need for WNV surveillance activities to monitor viral evolution and diversity.

Original languageEnglish
JournalClinical Microbiology and Infection
Volume21
Issue number12
DOIs
Publication statusPublished - Dec 1 2015

Fingerprint

West Nile virus
Greece
Italy
Disease Outbreaks
Genome
Genotype
Amino Acid Substitution
Computer Simulation
Cluster Analysis
Viruses
Pressure

Keywords

  • Europe
  • genetic evolution
  • genome sequencing
  • Greece
  • Italy
  • molecular epidemiology
  • phylogenetic analysis
  • West Nile virus
  • WNV lineage 1
  • WNV lineage 2

ASJC Scopus subject areas

  • Microbiology (medical)
  • Infectious Diseases

Cite this

Phylogenetic characterization of Central/Southern European lineage 2 West Nile virus : analysis of human outbreaks in Italy and Greece, 2013-2014. / Barzon, L.; Papa, A.; Lavezzo, E.; Franchin, E.; Pacenti, M.; Sinigaglia, A.; Masi, G.; Trevisan, M.; Squarzon, L.; Toppo, S.; Papadopoulou, E.; Nowotny, N.; Ulbert, S.; Piralla, A.; Rovida, F.; Baldanti, F.; Percivalle, E.; Palù, G.

In: Clinical Microbiology and Infection, Vol. 21, No. 12, 01.12.2015.

Research output: Contribution to journalArticle

Barzon, L, Papa, A, Lavezzo, E, Franchin, E, Pacenti, M, Sinigaglia, A, Masi, G, Trevisan, M, Squarzon, L, Toppo, S, Papadopoulou, E, Nowotny, N, Ulbert, S, Piralla, A, Rovida, F, Baldanti, F, Percivalle, E & Palù, G 2015, 'Phylogenetic characterization of Central/Southern European lineage 2 West Nile virus: analysis of human outbreaks in Italy and Greece, 2013-2014', Clinical Microbiology and Infection, vol. 21, no. 12. https://doi.org/10.1016/j.cmi.2015.07.018
Barzon, L. ; Papa, A. ; Lavezzo, E. ; Franchin, E. ; Pacenti, M. ; Sinigaglia, A. ; Masi, G. ; Trevisan, M. ; Squarzon, L. ; Toppo, S. ; Papadopoulou, E. ; Nowotny, N. ; Ulbert, S. ; Piralla, A. ; Rovida, F. ; Baldanti, F. ; Percivalle, E. ; Palù, G. / Phylogenetic characterization of Central/Southern European lineage 2 West Nile virus : analysis of human outbreaks in Italy and Greece, 2013-2014. In: Clinical Microbiology and Infection. 2015 ; Vol. 21, No. 12.
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