Identification of a novel microRNA (miRNA) from rice that targets an alternatively spliced transcript of the Nramp6 (Natural resistance-associated macrophage protein 6) gene involved in pathogen resistance

Sonia Campo, Cristina Peris-Peris, Christelle Siré, Ana Beatriz Moreno, Livia Donaire, Matthias Zytnicki, Cedric Notredame, César Llave, Blanca San Segundo

    Research output: Contribution to journalArticleResearchpeer-review

    145 Citations (Scopus)

    Abstract

    Plants have evolved efficient defence mechanisms to defend themselves from pathogen attack. Although many studies have focused on the transcriptional regulation of defence responses, less is known about the involvement of microRNAs (miRNAs) as post-transcriptional regulators of gene expression in plant immunity. This work investigates miRNAs that are regulated by elicitors from the blast fungus Magnaporthe oryzae in rice (Oryza sativa). Small RNA libraries were constructed from rice tissues and subjected to high-throughput sequencing for the identification of elicitor-responsive miRNAs. Target gene expression was examined by microarray analysis. Transgenic lines were used for the analysis of miRNA functioning in disease resistance. Elicitor treatment is accompanied by dynamic alterations in the expression of a significant number of miRNAs, including new members of annotated miRNAs. Novel miRNAs from rice are proposed. We report a new rice miRNA, osa-miR7695, which negatively regulates an alternatively spliced transcript of OsNramp6 (Natural resistance-associated macrophage protein 6). This novel miRNA experienced natural and domestication selection events during evolution, and its overexpression in rice confers pathogen resistance. This study highlights an miRNA-mediated regulation of OsNramp6 in disease resistance, whilst illustrating the existence of a novel regulatory network that integrates miRNA function and mRNA processing in plant immunity. © 2013 The Authors. New Phytologist © 2013 New Phytologist Trust.
    Original languageEnglish
    Pages (from-to)212-227
    JournalNew Phytologist
    Volume199
    Issue number1
    DOIs
    Publication statusPublished - 1 Jul 2013

    Keywords

    • Alternative splicing
    • Elicitors
    • Evolution
    • Magnaporthe oryzae
    • Metal transporter
    • MicroRNA
    • Nramp
    • Rice (Oryza sativa)

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