Abstract
Pigs can be concurrently infected with different PCV2 strains. In this study, a cell-culture-adapted PCV2 strain, originating from a PMWS-affected pig, was purified by limiting dilution. Three different strains were obtained, and one of them was a perfect mosaic of the other two, with recombination breakpoints in ORF1 and ORF2. Incongruence was observed between phylogenetic trees constructed with the whole genome, ORF1 and ORF2. Amplification of ORF1 and ORF2 from original material, followed by cloning and sequencing, resulted in sequences corresponding to the parental strains, but not with the mosaic strain. These results demonstrate that PCV2 can undergo recombination.
Abbreviations
- aa:
-
Amino-acid
- IPMA:
-
Immunoperoxidase monolayer assay
- ML:
-
Maximum-likelihood
- NJ:
-
Neighbor-joining
- nt:
-
Nucleotide
- ORF:
-
Open reading frame
- PCV2:
-
Porcine circovirus type 2
- PMWS:
-
Postweaning multisystemic wasting syndrome
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Acknowledgments
This work was funded by the EU (Sixth Framework Programme, Project No. 513928, coordinated by Dr. G. Allan). The authors acknowledge Dr. P. Meerts for providing the original inguinal lymph node material. The authors thank C. Boone, C. Bracke and D. Helderweirt for their technical assistance.
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The GenBank/EMBL/DDBJ accession numbers of the sequences from clones II11A (‘strain 1’), 4D4 (‘strain 3’) and II9F (‘strain 2’) determined in this study are EU909686, EU909687 and EU909688, respectively.
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Lefebvre, D.J., Van Doorsselaere, J., Delputte, P.L. et al. Recombination of two porcine circovirus type 2 strains. Arch Virol 154, 875–879 (2009). https://doi.org/10.1007/s00705-009-0379-8
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DOI: https://doi.org/10.1007/s00705-009-0379-8