Novel long non-protein coding RNAs involved in Arabidopsis differentiation and stress responses.

Besma Ben Amor (1) , Sonia Wirth (1) , Francisco Merchan (1) , Philippe Laporte (1) , Yves d'Aubenton-Carafa (2) , Judith Hirsch (3) , Alexis Maizel (1) , Allison Mallory (4) , Antoine Lucas (2) , Jean Marc Deragon (5) , Herve Vaucheret (4) , Claude Thermes (2) , Martin Crespi (1)

1 ISV - Institut des sciences du végétal
2 CGM - Centre de génétique moléculaire
3 Biomedal SL
4 INRA - Institut National de la Recherche Agronomique
5 LGDP - Laboratoire Génome et développement des plantes

Long non-protein coding RNAs (npcRNA) represent an emerging class of riboregulators, which either act directly in this long form or are processed to shorter miRNA and siRNA. Genome-wide bioinformatic analysis of full-length cDNA databases identified 76 Arabidopsis npcRNAs. Fourteen npcRNAs were antisense to protein-coding mRNAs, suggesting cis-regulatory roles. Numerous 24-nt siRNA matched to five different npcRNAs, suggesting that these npcRNAs are precursors of this type of siRNA. Expression analyses of the 76 npcRNAs identified a novel npcRNA that accumulates in a dcl1 mutant but does not appear to produce trans-acting siRNA or miRNA. Additionally, another npcRNA was the precursor of miR869 and shown to be up-regulated in dcl4 but not in dcl1 mutants, indicative of a young miRNA gene. Abiotic stress altered the accumulation of 22 npcRNAs among the 76, a fraction significantly higher than that observed for the RNA binding protein-coding fraction of the transcriptome. Overexpression analyses in Arabidopsis identified two npcRNAs as regulators of root growth during salt stress and leaf morphology, respectively. Hence, together with small RNAs, long npcRNAs encompass a sensitive component of the transcriptome that have diverse roles during growth and differentiation.

Domaines: Biochimie, Biologie Moléculaire; Biologie cellulaire; Génétique; Biochimie [q-bio.BM]; Biologie moléculaire; Biologie structurale [q-bio.BM]; Génomique, Transcriptomique et Protéomique [q-bio.GN]; Réseaux moléculaires [q-bio.MN]; Evolution [q-bio.PE]; Systématique, phylogénie et taxonomie; Amélioration des plantes; Génétique des plantes; Bio-Informatique, Biologie Systémique [q-bio.QM]; Bio-informatique [q-bio.QM]; Biologie végétale

Besma Ben Amor, Sonia Wirth, Francisco Merchan, Philippe Laporte, Yves d'Aubenton-Carafa, et al.. Novel long non-protein coding RNAs involved in Arabidopsis differentiation and stress responses.. Genome Research, 2009, 19 (1), pp.57-69. ⟨10.1101/gr.080275.108⟩. ⟨hal-00736193⟩