Identification of a novel polyomavirus from a marsupial host

Area of Science:

• Virology
• Genomics
• Marsupial biology

Background:

• Polyomaviruses are a diverse group of small DNA viruses with a wide range of hosts.
• Marsupial viruses are relatively understudied, limiting our understanding of viral evolution in these unique mammals.
• Wobbly possum disease (WPD) is a neurological condition affecting brushtail possums, prompting investigation into its causative agent.

Purpose of the Study:

• To identify and characterize a novel polyomavirus from brushtail possums (Trichosurus vulpecula).
• To determine the genomic organization and phylogenetic relationship of the novel virus.
• To assess the virus's potential etiological role in wobbly possum disease.

Main Methods:

• Next-generation sequencing (NGS) for viral genome assembly.
• Bioinformatic analysis for genome annotation and phylogenetic analysis.
• Comparison of viral sequences with known polyomaviruses.

Main Results:

• A complete genome sequence of a novel polyomavirus, named possum polyomavirus (PPyV), was identified.
• The PPyV genome is 5,224 nucleotides long, featuring typical polyomavirus early and late coding regions and a non-coding control region.
• PPyV shares less than 60% sequence identity with known betapolyomaviruses, suggesting it represents a new species.
• PPyV was not found to be the causative agent of wobbly possum disease.

Conclusions:

• PPyV is a novel polyomavirus identified in brushtail possums, distinct from previously characterized members of the Betapolyomavirus genus.
• The data support the classification of PPyV as a new species within the Betapolyomavirus genus.
• This discovery expands the known diversity of marsupial viruses and contributes to understanding viral evolution in marsupials.