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  Rapidly Evolving Genes Are Key Players in Host specialization and virulence of the fungal wheat pathogen Zymoseptoria tritici (Mycosphaerella graminicola)

Poppe, S., Dorsheimer, L., Happel, P., & Stukenbrock, E. H. (2015). Rapidly Evolving Genes Are Key Players in Host specialization and virulence of the fungal wheat pathogen Zymoseptoria tritici (Mycosphaerella graminicola). PLoS Pathogens, 11(7): e1005055. doi:10.1371/journal.ppat.1005055.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-5D12-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-5D5F-B
Genre: Journal Article

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 Creators:
Poppe, Stephan, Author
Dorsheimer, Lena, Author
Happel, Petra, Author
Stukenbrock, Eva H.1, Author              
Affiliations:
1Max Planck Fellow Group Environmental Genomics, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_2068284              

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 Abstract: The speciation of pathogens can be driven by divergent host specialization. Specialization to a new host is possible via the acquisition of advantageous mutations fixed by positive selection. Comparative genome analyses of closely related species allows for the identification of such key substitutions via inference of genome-wide signatures of positive selection. We previously used a comparative genomics framework to identify genes that have evolved under positive selection during speciation of the prominent wheat pathogen Zymoseptoria tritici (synonym Mycosphaerella graminicola). In this study, we conducted functional analyses of four genes exhibiting strong signatures of positive selection in Z. tritici.We deleted the four genes in Z. tritici and confirm a virulence-related role of three of the four genes ΔZt80707, ΔZt89160 and ΔZt103264. The two mutants ΔZt80707 and ΔZt103264 show a significant reduction in virulence during infection of wheat; the ΔZt89160 mutant causes a hypervirulent phenotype in wheat. Mutant phenotypes of ΔZt80707, ΔZt89160 and ΔZt103264 can be restored by insertion of the wild-type genes. However, the insertion of the Zt80707 and Zt89160 orthologs from Z. pseudotritici and Z. ardabiliae do not restore wild-type levels of virulence, suggesting that positively selected substitutions in Z. tritici may relate to divergent host specialization. Interestingly, the gene Zt80707 encodes also a secretion signal that targets the protein for cell secretion. This secretion signal is however only transcribed in Z. tritici, suggesting that Z. tritici-specific substitutions relate to a new function of the protein in the extracellular space of the wheat-Z. tritici interaction. Together, the results presented here highlight that Zt80707, Zt103264 and Zt89160 represent key genes involved in virulence and host-specific disease development of Z. tritici. Our findings illustrate that evolutionary predictions provide a powerful tool for the identification of novel traits crucial for host adaptation and pathogen evolution.

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Language(s): eng - English
 Dates: 2015-01-042015-06-292015-07-30
 Publication Status: Published online
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 Identifiers: DOI: 10.1371/journal.ppat.1005055
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Title: PLoS Pathogens
  Other : PLoS Pathog.
Source Genre: Journal
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Publ. Info: San Francisco, CA : Public Library of Science
Pages: 21 Seiten Volume / Issue: 11 (7) Sequence Number: e1005055 Start / End Page: - Identifier: ISSN: 1553-7366
CoNE: /journals/resource/1000000000018830