DNA virus BdDV-1 of the amphibian pathogen Batrachochytrium dendrobatidis is associated with hypervirulence
Clemmons, R.; Yacoub, M.; Faust, E.; Toledo, L. F.; Jenkinson, T. S.; Kalinka, E.; Fritz-Laylin, L. K.; James, T. Y.; Stajich, J. E.
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The Global Panzootic Lineage (GPL) of the pathogenic fungus Batrachochytrium dendrobatidis (Bd) has caused severe amphibian population declines, yet the drivers underlying the high frequency of GPL in regions of amphibian decline are unclear. Using publicly available Bd genome sequences, we identified multiple non-GPL Bd isolates that contain a circular Rep-encoding single stranded DNA (CRESS)-like virus which we named BdDV-1. We further sequenced and constructed genome assemblies with long read sequences to find that the virus is integrated into the nuclear genome in some strains. Attempts to cure virus positive isolates were unsuccessful, however, phenotypic differences between naturally virus positive and virus negative Bd isolates suggested that BdDV-1 decreases the growth of its host in vitro but increases the virulence of its host in vivo. BdDV-1 is the first described CRESS DNA mycovirus of zoosporic true fungi with a distribution inversely associated with the emergence of the panzootic lineage.
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