University Of Tasmania
Sarker et al 2014_OBP PBFD mutability dynamics of ss DNA virus.pdf (3.17 MB)
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Mutability dynamics of an emergent single stranded DNA Virus in a naïve host

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posted on 2023-05-18, 00:59 authored by Sarker, S, Patterson, EI, Peters, A, Geoffrey BakerGeoffrey Baker, Forwood, JK, Ghorashi, SA, Holdsworth, M, Baker, R, Murray, N, Raidal, SR
Quasispecies variants and recombination were studied longitudinally in an emergent outbreak of beak and feather disease virus (BFDV) infection in the orange-bellied parrot (Neophema chrysogaster). Detailed health monitoring and the small population size (<300 individuals) of this critically endangered bird provided an opportunity to longitudinally track viral replication and mutation events occurring in a circular, single-stranded DNA virus over a period of four years within a novel bottleneck population. Optimized PCR was used with different combinations of primers, primer walking, direct amplicon sequencing and sequencing of cloned amplicons to analyze BFDV genome variants. Analysis of complete viral genomes (n = 16) and Rep gene sequences (n = 35) revealed that the outbreak was associated with mutations in functionally important regions of the normally conserved Rep gene and immunogenic capsid (Cap) gene with a high evolutionary rate (3.41 x 10-3 subs/site/year) approaching that for RNA viruses; simultaneously we observed significant evidence of recombination hotspots between two distinct progenitor genotypes within orange-bellied parrots indicating early cross-transmission of BFDV in the population. Multiple quasispecies variants were also demonstrated with at least 13 genotypic variants identified in four different individual birds, with one containing up to seven genetic variants. Preferential PCR amplification of variants was also detected. Our findings suggest that the high degree of genetic variation within the BFDV species as a whole is reflected in evolutionary dynamics within individually infected birds as quasispecies variation, particularly when BFDV jumps from one host species to another.


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Institute for Marine and Antarctic Studies


Public Library of Science

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Copyright 2014 The Authors-This is an open-access article distributed under the terms of the Creative Commons Attribution License, (CC BY 3.0 AU) which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Assessment and management of coastal and estuarine ecosystems

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