Abstract
The sequencing of large numbers of eukaryotic genomes has demonstrated the widespread occurrence of viral genes in nuclear (and mitochondrial) genomes. Essentially all the families of RNA viruses are represented, and we have coined the term NIRV (non-retroviral integrated RNA virus) for these sequences. Some 3% of sequenced eukaryotic genomes have NIRVs and the fungi are well represented with both complete and partial copies of RNA viral genes. The fungal NIRVs are the best characterized and demonstrate that, with the most widespread fungal viruses, the dsRNA totiviruses and partitiviruses, which generally exist as stable persistent infections in their hosts, gene transfers between host and virus have taken place in both directions. Selection has preserved those events with adaptive value: hosts with NIRVs have become immune to infection with the cognate virus and viruses with cellular toxin genes provide an advantage to their hosts by killing cells without the virus.
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Bruenn, J. (2012). Genes from Double-Stranded RNA Viruses in the Nuclear Genomes of Fungi. In: Witzany, G. (eds) Biocommunication of Fungi. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-4264-2_5
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DOI: https://doi.org/10.1007/978-94-007-4264-2_5
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