Analysis of GII.P7 and GII.6 noroviruses circulating in Italy during 2011–2016 reveals a replacement of lineages and complex recombination history

Simona De Grazia, Giovanni Giammanco, Maria Cristina Medici, Cristiana Catella, Kentaro Tohma, Floriana Bonura, Gianvito Lanave, Daniela Loconsole, Georgia Diakoudi, Flora De Conto, Maria Chironna, Vito Martella, Adriana Calderaro, Gabriel Ignacio Parra, Kristián Bányai, Floriana Bonura

Risultato della ricerca: Article

Abstract

Noroviruses are important human enteric pathogens and monitoring their genetic diversity is important for epidemiological surveillance, vaccine development, and understanding of RNA viruses evolution. Epidemiological investigations have revealed that genogroup II, genotype 6 noroviruses (GII.6) are common agents of gastroenteritis. Upon sequencing of the ORF2 (encoding the viral capsid), GII.6 viruses have been distinguished into three variants. Sentinel hospital-based surveillance in Italy revealed that GII.6 noroviruses were the second most common capsid genotype in 2015, mostly in association with a GII.P7 ORF1 (encoding the viral polymerase). Upon molecular characterization of the ORF1 and ORF2, the GII.P7_GII.6 epidemic viruses circulating in 2014–2015 (variant GII.6b) were different from those that circulated sporadically in 2011–2013 (variant GII.6a). Analysis of the ORF1 (GII.P7) and ORF2 (GII.6) sequences available in the databases unveiled marked genetic diversity and peculiarities in the phylogenetic segregation patterns, suggesting multiple recombination events. Phylogenetic analyses suggest that recent GII.P7_GII.6b viruses were circulating as early as 2008, and formed a genetically homogenous group that emerged globally.
Lingua originaleEnglish
Numero di pagine10
RivistaINFECTION GENETICS AND EVOLUTION
Volume75
Stato di pubblicazionePublished - 2019

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Genetics
  • Microbiology (medical)
  • Infectious Diseases

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    De Grazia, S., Giammanco, G., Medici, M. C., Catella, C., Tohma, K., Bonura, F., Lanave, G., Loconsole, D., Diakoudi, G., De Conto, F., Chironna, M., Martella, V., Calderaro, A., Parra, G. I., Bányai, K., & Bonura, F. (2019). Analysis of GII.P7 and GII.6 noroviruses circulating in Italy during 2011–2016 reveals a replacement of lineages and complex recombination history. INFECTION GENETICS AND EVOLUTION, 75.