1887

Abstract

Papillomaviruses appear to be species-specific pathogens, and it was suggested that each animal species might harbour its own set of papillomaviruses. However, all approaches addressing the underlying evolutionary phenomena still suffer from very limited data about animal papillomaviruses. In case of the horse for example, only three equine papillomaviruses (EcPVs) have been identified. To further address the situation in this host, suspected papillomavirus-associated lesions were tested for EcPV DNA. Four novel EcPV types were detected and their genomes entirely cloned and sequenced. They display the characteristic organization, with early (E) and late (L) regions harbouring the seven classical open reading frames divided by non-coding regions. They were named EcPVs 4, 5, 6 and 7, according to their dissimilarity to other papillomaviruses. Most L1 nucleotide identities were shared with EcPV2 in case of EcPV4 (62 %) and EcPV5 (60 %) or with EcPV3 in case of EcPV6 (70 %) and EcPV7 (71 %). Thus, EcPVs 4 and 5 may establish novel species within the genus , while EcPVs 6 and 7 might fit into the genus and belong to the same species as EcPV3. They were found in genital plaques (EcPV4), aural plaques (EcPV5, EcPV6) or penile masses (EcPV7). Interestingly, PCR analysis revealed the DNA of EcPV2 and EcPV4 as well as of EcPV3 and EcPV6 together in the same tissue samples, respectively. In conclusion, the DNA of four novel EcPV types was identified and cloned. They cluster with the known types and support broad genetic EcPV diversity in at least two of the known clades. Furthermore, PCR assays also provide evidence for EcPV co-infections in horses.

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2013-06-01
2019-10-15
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