Molecular characterization of feline infectious peritonitis virus strain DF-2 and studies of the role of ORF3abc in viral cell tropism

Ádám Bálint, Attila Farsang, Zoltán Zádori, Ákos Hornyák, László Dencsö, Fernando Almazán, Luis Enjuanes, Sándor Belák

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33 Citations (Scopus)


The full-length genome of the highly lethal feline infectious peritonitis virus (FIPV) strain DF-2 was sequenced and cloned into a bacterial artificial chromosome (BAC) to study the role of ORF3abc in the FIPV-feline enteric coronavirus (FECV) transition. The reverse genetic system allowed the replacement of the truncated ORF3abc of the original FIPV DF-2 genome with the intact ORF3abc of the canine coronavirus (CCoV) reference strain Elmo/02. The in vitro replication kinetics of these two viruses was studied in CrFK and FCWF-4 cell lines, as well as in feline peripheral blood monocytes. Both viruses showed similar replication kinetics in established cell lines. However, the strain with a full-length ORF3 showed markedly lower replication of more than 2 log10 titers in feline peripheral blood monocytes. Our results suggest that the truncated ORF3abc plays an important role in the efficient macrophage/monocyte tropism of type II FIPV.

Original languageEnglish
Pages (from-to)6258-6267
Number of pages10
JournalJournal of Virology
Issue number11
Publication statusPublished - Jun 1 2012


ASJC Scopus subject areas

  • Microbiology
  • Immunology
  • Insect Science
  • Virology

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