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A-to-I editing of Malacoherpesviridae RNAs supports the antiviral role of ADAR1 in mollusks

文献类型： 外文期刊

作者： Rosani, Umberto 1 ; Bai, Chang-Ming 3 ; Maso, Lorenzo 1 ; Shapiro, Maxwell 4 ; Abbadi, Miriam 5 ; Domeneghetti, Ste 1 ;

作者机构： 1.Univ Padua, Dept Biol, I-32121 Padua, Italy

2.AWI, Helmholtz Ctr Polar & Marine Res, Wadden Sea Stn, D-25992 List Auf Sylt, Germany

3.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao, Shandong, Peoples R China

4.SUNY Stony Brook, Dept Appl Math & Stat, Stony Brook, NY 11794 USA

5.Ist Zooprofilatt Sperimentale Venezie, I-35020 Legnaro, Italy

关键词： ADAR; Malacoherpesvirus; OsHV-1; AbHV-1; Mollusks; Oysters; Abalones; RNA editing; Antiviral responses; A-to-I editing

期刊名称：BMC EVOLUTIONARY BIOLOGY （ 影响因子：3.26； 五年影响因子：3.732 ）

ISSN： 1471-2148

年卷期： 2019 年 19 卷

页码：

收录情况： SCI

摘要： BackgroundAdenosine deaminase enzymes of the ADAR family are conserved in metazoans. They convert adenine into inosine in dsRNAs and thus alter both structural properties and the coding potential of their substrates. Acting on exogenous dsRNAs, ADAR1 exerts a pro- or anti-viral role in vertebrates and Drosophila.ResultsWe traced 4 ADAR homologs in 14 lophotrochozoan genomes and we classified them into ADAD, ADAR1 or ADAR2, based on phylogenetic and structural analyses of the enzymatic domain. Using RNA-seq and quantitative real time PCR we demonstrated the upregulation of one ADAR1 homolog in the bivalve Crassostrea gigas and in the gastropod Haliotis diversicolor supertexta during Ostreid herpesvirus-1 or Haliotid herpesvirus-1 infection. Accordingly, we demonstrated an extensive ADAR-mediated editing of viral RNAs. Single nucleotide variation (SNV) profiles obtained by pairing RNA- and DNA-seq data from the viral infected individuals resulted to be mostly compatible with ADAR-mediated A-to-I editing (up to 97%). SNVs occurred at low frequency in genomic hotspots, denoted by the overlapping of viral genes encoded on opposite DNA strands. The SNV sites and their upstream neighbor nucleotide indicated the targeting of selected adenosines. The analysis of viral sequences suggested that, under the pressure of the ADAR editing, the two Malacoherpesviridae genomes have evolved to reduce the number of deamination targets.ConclusionsWe report, for the first time, evidence of an extensive editing of Malacoherpesviridae RNAs attributable to host ADAR1 enzymes. The analysis of base neighbor preferences, structural features and expression profiles of molluscan ADAR1 supports the conservation of the enzyme function among metazoans and further suggested that ADAR1 exerts an antiviral role in mollusks.

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