6533b7d3fe1ef96bd1260a4e
RESEARCH PRODUCT
Arabidopsis SGS2 and SGS3 genes are required for posttranscriptional gene silencing and natural virus resistance.
Snezana NikicJean-benoit MorelPhilippe MourrainKarine RémouéHervé VaucheretTaline ElmayanMathieu SanialChristophe BéclinAnne-marie LacombeFrank FeuerbachNathalie PicaultDavid JouetteTruy-anh VoChristian Godonsubject
0106 biological sciencesRNA-induced transcriptional silencingDNA PlantRNA-induced silencing complexTrans-acting siRNAMolecular Sequence DataPotyvirusArabidopsisRNA-dependent RNA polymerase[SDV.BC]Life Sciences [q-bio]/Cellular BiologyGenes Plant01 natural sciencesCucumovirusGeneral Biochemistry Genetics and Molecular Biology03 medical and health sciencesSolanum lycopersicumRNA interferenceArabidopsisGene expressionGene silencingAmino Acid SequenceGene SilencingCloning MolecularRNA Processing Post-Transcriptional[SDV.BC] Life Sciences [q-bio]/Cellular BiologyComputingMilieux_MISCELLANEOUS030304 developmental biologyPlant DiseasesPlant ProteinsGenetics0303 health sciencesbiologyBase SequenceBiochemistry Genetics and Molecular Biology(all)Arabidopsis ProteinsfungiTobamovirusChromosome MappingGENETIQUEbiology.organism_classificationRNA-Dependent RNA PolymeraseMutagenesis010606 plant biology & botanydescription
AbstractPosttranscriptional gene silencing (PTGS) in plants results from the degradation of mRNAs and shows phenomenological similarities with quelling in fungi and RNAi in animals. Here, we report the isolation of sgs2 and sgs3 Arabidopsis mutants impaired in PTGS. We establish a mechanistic link between PTGS, quelling, and RNAi since the Arabidopsis SGS2 protein is similar to an RNA-dependent RNA polymerase like N. crassa QDE-1, controlling quelling, and C. elegans EGO-1, controlling RNAi. In contrast, SGS3 shows no significant similarity with any known or putative protein, thus defining a specific step of PTGS in plants. Both sgs2 and sgs3 mutants show enhanced susceptibility to virus, definitively proving that PTGS is an antiviral defense mechanism that can also target transgene RNA for degradation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-05-01 | Cell |