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The transcriptomes of Xiphinema index and Longidorus elongatus suggest independent acquisition of some plant parasitism genes by horizontal gene transfer in early-branching nematodes

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Author(s)

Etienne G J Danchin, Laetitia Perfus-Barbeoch, Corinne Rancurel, Peter Thorpe, Martine Da Rocha, Simon Bajew, Roy Neilson, Elena Sokolova Guzeeva, Corinne Da Silva, Julie Guy, Karine Labadie, Daniel Esmenjaud, Johannes Helder, John T Jones, Sebastian Eves-van den Akker

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Abstract

Nematodes have evolved the ability to parasitize plants on at least four independent occasions, with plant parasites present in Clades 1, 2, 10 and 12 of the phylum. In the case of Clades 10 and 12, horizontal gene transfer of plant cell wall degrading enzymes from bacteria and fungi has been implicated in the evolution of plant parasitism. We have used ribonucleic acid sequencing (RNAseq) to generate reference transcriptomes for two economically important nematode species, Xiphinema index and Longidorus elongatus, representative of two genera within the early-branching Clade 2 of the phylum Nematoda. We used a transcriptome-wide analysis to identify putative horizontal gene transfer events. This represents the first in-depth transcriptome analysis from any plant-parasitic nematode of this clade. For each species, we assembled ~30 million Illumina reads into a reference transcriptome. We identified 62 and 104 transcripts, from X. index and L. elongatus, respectively, that were putatively acquired via horizontal gene transfer. By cross-referencing horizontal gene transfer prediction with a phylum-wide analysis of Pfam domains, we identified Clade 2-specific events. Of these, a GH12 cellulase from X. index was analysed phylogenetically and biochemically, revealing a likely bacterial origin and canonical enzymatic function. Horizontal gene transfer was previously shown to be a phenomenon that has contributed to the evolution of plant parasitism among nematodes. Our findings underline the importance and the extensiveness of this phenomenon in the evolution of plant-parasitic life styles in this speciose and widespread animal phylum.

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Original languageEnglish
Article number287
JournalGenes
Volume8
Issue number10
DOIs
Publication statusPublished - 23 Oct 2017

    Research areas

  • Glycoside hydrolase, Horizontal gene transfer, Nematodes, Plant parasitism

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