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Transposon mediated horizontal transfer of the host-specific virulence protein ToxA between three fungal wheat pathogens

View ORCID ProfileMegan C. McDonald, Adam P. Taranto, Erin Hill, View ORCID ProfileBenjamin Schwessinger, Zhaohui Liu, Steven Simpfendorfer, Andrew Milgate, Peter S. Solomon
doi: https://doi.org/10.1101/671446
Megan C. McDonald
1Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra 2601, Australia
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  • For correspondence: megan.mcdonald@anu.edu.au
Adam P. Taranto
1Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra 2601, Australia
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Erin Hill
1Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra 2601, Australia
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Benjamin Schwessinger
1Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra 2601, Australia
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Zhaohui Liu
2Department of Plant Pathology, North Dakota State University, Fargo, ND, USA
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Steven Simpfendorfer
3NSW Department of Primary Industries, Tamworth Agricultural Institute, Tamworth, NSW 2340, Australia
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Andrew Milgate
4NSW Department of Primary Industries, Wagga Wagga Agricultural Institute, Wagga Wagga, NSW 2650, Australia
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Peter S. Solomon
1Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra 2601, Australia
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  • For correspondence: megan.mcdonald@anu.edu.au
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ABSTRACT

Most known examples of horizontal gene transfer (HGT) between eukaryotes are ancient. These events are identified primarily using phylogenetic methods on coding regions alone. Only rarely are there examples of HGT where non-coding DNA is also reported. The gene encoding the wheat virulence protein ToxA and surrounding 14 kb is one of these rare examples. ToxA has been horizontally transferred between three fungal wheat pathogens (Parastagonospora nodorum, Pyrenophora tritici-repentis and Bipolaris sorokiniana) as part of a conserved ∼14kb element, which contains coding and non-coding regions. Here we use long-read sequencing to define the extent of HGT between these three fungal species. Construction of near-chromosomal level assemblies enabled identification of terminal inverted repeats on either end of the 14kb region, typical of a Type II DNA transposon. This is the first description of ToxA with complete transposon features, which we call ToxhAT. In all three species, ToxhAT resides in a large (140-250 kb) transposon-rich genomic island which is absent in toxA- isolates. We demonstrate that the horizontal transfer of ToxhAT between Pyrenophora tritici-repentis and P. nodorum occurred as part of a large ∼80kb HGT which is now undergoing extensive decay. In contrast, in B. sorokiniana ToxhAT and its resident genomic island are mobile within the genome. Together these data provide insight into the non-coding regions that facilitate HGT between eukaryotes and the genomic processes which mask the extent of HGT between these species.

IMPORTANCE This work dissects the tripartite horizontal transfer of ToxA; a gene that has a direct negative impact on global wheat yields. Defining the extent of horizontally transferred DNA is important because it can provide clues as to the mechanisms that facilitate HGT. Our analysis of ToxA and its surrounding 14kb suggests that this gene was horizontally transferred in two independent events, with one event likely facilitated by a Type II DNA transposon. These horizontal transfer events are now in various processes of decay in each species due to the repeated insertion of new transposons and subsequent rounds of targeted mutation by a fungal genome defense mechanism known as repeat induced point-mutation. This work highlights the role that HGT plays in the evolution of host adaptation in eukaryotic pathogens. It also increases the growing body of evidence that transposons facilitate adaptive HGT events between fungi present in similar environments and hosts.

DATA AVAILABILITY All raw sequencing data is available under NCBI BioProject PRJNA505097.

The P. nodorum SN15 Whole Genome Shotgun project has been deposited at DDBJ/ENA/GenBank under the accession SSHU00000000. The version SSHU01000000 is described in this paper. The P. nodorum SN79-1087 Whole Genome Shotgun project has been deposited under the accessions CP039668-CP039689. The Whole Genome shotgun project and accession numbers for B. sorokiniana isolates are as follows: CS10; SRZH00000000, CS27; SRZG00000000, WAI2406; SRZF00000000, WAI2411; SRZE00000000. Transposon annotations, CS10 and CS27 gene annotations are available at https://github.com/megancamilla/Transposon-Mediated-transfer-of-ToxA

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted June 17, 2019.
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Transposon mediated horizontal transfer of the host-specific virulence protein ToxA between three fungal wheat pathogens
Megan C. McDonald, Adam P. Taranto, Erin Hill, Benjamin Schwessinger, Zhaohui Liu, Steven Simpfendorfer, Andrew Milgate, Peter S. Solomon
bioRxiv 671446; doi: https://doi.org/10.1101/671446
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Transposon mediated horizontal transfer of the host-specific virulence protein ToxA between three fungal wheat pathogens
Megan C. McDonald, Adam P. Taranto, Erin Hill, Benjamin Schwessinger, Zhaohui Liu, Steven Simpfendorfer, Andrew Milgate, Peter S. Solomon
bioRxiv 671446; doi: https://doi.org/10.1101/671446

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