The nuclear and organellar tRNA-derived RNA fragment population in Arabidopsis thaliana is highly dynamic.
Fiche publication
Date publication
avril 2017
Journal
Nucleic acids research
Auteurs
Membres identifiés du Cancéropôle Est :
Mme COGNAT Valérie
Tous les auteurs :
Cognat V, Morelle G, Megel C, Lalande S, Molinier J, Vincent T, Small I, Duchêne AM, Maréchal-Drouard L
Lien Pubmed
Résumé
In the expanding repertoire of small noncoding RNAs (ncRNAs), tRNA-derived RNA fragments (tRFs) have been identified in all domains of life. Their existence in plants has been already proven but no detailed analysis has been performed. Here, short tRFs of 19-26 nucleotides were retrieved from Arabidopsis thaliana small RNA libraries obtained from various tissues, plants submitted to abiotic stress or fractions immunoprecipitated with ARGONAUTE 1 (AGO1). Large differences in the tRF populations of each extract were observed. Depending on the tRNA, either tRF-5D (due to a cleavage in the D region) or tRF-3T (via a cleavage in the T region) were found and hot spots of tRNA cleavages have been identified. Interestingly, up to 25% of the tRFs originate from plastid tRNAs and we provide evidence that mitochondrial tRNAs can also be a source of tRFs. Very specific tRF-5D deriving not only from nucleus-encoded but also from plastid-encoded tRNAs are strongly enriched in AGO1 immunoprecipitates. We demonstrate that the organellar tRFs are not found within chloroplasts or mitochondria but rather accumulate outside the organelles. These observations suggest that some organellar tRFs could play regulatory functions within the plant cell and may be part of a signaling pathway.
Mots clés
Arabidopsis, genetics, Arabidopsis Proteins, metabolism, Argonaute Proteins, metabolism, Cell Nucleus, genetics, Plant Leaves, genetics, Plant Roots, genetics, Plastids, metabolism, RNA, metabolism, RNA, Chloroplast, metabolism, RNA, Transfer, chemistry, RNA, Untranslated, chemistry, Stress, Physiological
Référence
Nucleic Acids Res.. 2017 Apr 7;45(6):3460-3472