The virome of the arbuscular mycorrhizal fungus Gigaspora margarita reveals the first report of DNA fragments corresponding to replicating non-retroviral RNA viruses in fungi.
Identifieur interne : 000985 ( Main/Corpus ); précédent : 000984; suivant : 000986The virome of the arbuscular mycorrhizal fungus Gigaspora margarita reveals the first report of DNA fragments corresponding to replicating non-retroviral RNA viruses in fungi.
Auteurs : Massimo Turina ; Stefano Ghignone ; Nausicaa Astolfi ; Alessandro Silvestri ; Paola Bonfante ; Luisa LanfrancoSource :
- Environmental microbiology [ 1462-2920 ] ; 2018.
English descriptors
- KwdEn :
- MESH :
- chemical , isolation & purification : DNA, Viral.
- genetics : Fungal Viruses, Fungi, Glomeromycota, Mycorrhizae, RNA Viruses.
- isolation & purification : RNA Viruses.
- virology : Glomeromycota, Mycorrhizae.
Abstract
Arbuscular Mycorrhizal Fungi (AMF) are key components of the plant microbiota. AMF genetic complexity is increased by the presence of endobacteria, which live inside many species. A further component of such complexity is the virome associated to AMF, whose knowledge is still very limited. Here, by exploiting transcriptomic data we describe the virome of Gigaspora margarita. A BLAST search for viral RNA-dependent RNA polymerases sequences allowed the identification of four mitoviruses, one Ourmia-like narnavirus, one Giardia-like virus, and two sequences related to Fusarium graminearum mycoviruses. Northern blot and RT-PCR confirmed the authenticity of all the sequences with the exception of the F. graminearum-related ones. All the mitoviruses are replicative and functional since both positive strand and negative strand RNA are present. The abundance of the viral RNA molecules is not regulated by the presence or absence of Candidatus Glomeribacter gigasporarum, the endobacterium hosted by G. margarita, with the exception of the Ourmia-like sequence which is absent in bacteria-cured spores. In addition, we report, for the first time, DNA fragments corresponding to mitovirus sequences associated to the presence of viral RNA. These sequences are not integrated in the mitochondrial DNA and preliminary evidence seems to exclude integration in the nuclear genome.
DOI: 10.1111/1462-2920.14060
PubMed: 29393558
Links to Exploration step
pubmed:29393558Le document en format XML
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<front><div type="abstract" xml:lang="en">Arbuscular Mycorrhizal Fungi (AMF) are key components of the plant microbiota. AMF genetic complexity is increased by the presence of endobacteria, which live inside many species. A further component of such complexity is the virome associated to AMF, whose knowledge is still very limited. Here, by exploiting transcriptomic data we describe the virome of Gigaspora margarita. A BLAST search for viral RNA-dependent RNA polymerases sequences allowed the identification of four mitoviruses, one Ourmia-like narnavirus, one Giardia-like virus, and two sequences related to Fusarium graminearum mycoviruses. Northern blot and RT-PCR confirmed the authenticity of all the sequences with the exception of the F. graminearum-related ones. All the mitoviruses are replicative and functional since both positive strand and negative strand RNA are present. The abundance of the viral RNA molecules is not regulated by the presence or absence of Candidatus Glomeribacter gigasporarum, the endobacterium hosted by G. margarita, with the exception of the Ourmia-like sequence which is absent in bacteria-cured spores. In addition, we report, for the first time, DNA fragments corresponding to mitovirus sequences associated to the presence of viral RNA. These sequences are not integrated in the mitochondrial DNA and preliminary evidence seems to exclude integration in the nuclear genome.</div>
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<Abstract><AbstractText>Arbuscular Mycorrhizal Fungi (AMF) are key components of the plant microbiota. AMF genetic complexity is increased by the presence of endobacteria, which live inside many species. A further component of such complexity is the virome associated to AMF, whose knowledge is still very limited. Here, by exploiting transcriptomic data we describe the virome of Gigaspora margarita. A BLAST search for viral RNA-dependent RNA polymerases sequences allowed the identification of four mitoviruses, one Ourmia-like narnavirus, one Giardia-like virus, and two sequences related to Fusarium graminearum mycoviruses. Northern blot and RT-PCR confirmed the authenticity of all the sequences with the exception of the F. graminearum-related ones. All the mitoviruses are replicative and functional since both positive strand and negative strand RNA are present. The abundance of the viral RNA molecules is not regulated by the presence or absence of Candidatus Glomeribacter gigasporarum, the endobacterium hosted by G. margarita, with the exception of the Ourmia-like sequence which is absent in bacteria-cured spores. In addition, we report, for the first time, DNA fragments corresponding to mitovirus sequences associated to the presence of viral RNA. These sequences are not integrated in the mitochondrial DNA and preliminary evidence seems to exclude integration in the nuclear genome.</AbstractText>
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