Identification of small RNAs during cold acclimation in Arabidopsis thaliana

• Published in: BMC plant biology Vol. 20; no. 1; p. 298
• Main Authors: Tiwari, Bhavika, Habermann, Kristin, Arif, M Asif, Weil, Heinrich Lukas, Garcia-Molina, Antoni, Kleine, Tatjana, Mühlhaus, Timo, Frank, Wolfgang
• Format: Journal Article
• Language: English
• Published: England BioMed Central Ltd 29-06-2020; BioMed Central; BMC
• Subjects: Abiotic stress; Abscisic acid; Acclimation; Acclimatization; Acclimatization - genetics; Arabidopsis - genetics; Arabidopsis - physiology; Arabidopsis thaliana; Biosynthesis; Cold; Cold acclimation; Cold Temperature; Deoxyribonucleic acid; DNA; DNA binding proteins; DNA methylation; Epigenetic inheritance; Epigenetics; Gene expression; Gene Expression Regulation, Plant; Gene Ontology; Gene regulation; Gene Regulatory Networks; Gene silencing; Genes, Plant; Genetic engineering; Kinases; Messenger RNA; MicroRNA; MicroRNAs; miRNA; miRNA-transcription factor network; NAT gene; Non-coding RNA; Proteins; Ribonucleic acid; RNA; RNA polymerase; RNA sequencing; RNA, Plant - physiology; RNA, Small Untranslated - physiology; Salinity; siRNA; Small non-coding RNA; Transcription (Genetics); Transcription factors; Transcriptome; Australia; Arabidopsis thaliana; RNA sequencing; miRNA-transcription factor network; Gene regulation; Cold acclimation; Small non-coding RNA
• ISSN: 1471-2229; 1471-2229
• DOI: 10.1186/s12870-020-02511-3

Cold stress causes dynamic changes in gene expression that are partially caused by small non-coding RNAs since they regulate protein coding transcripts and act in epigenetic gene silencing pathways. Thus, a detailed analysis of transcriptional changes of small RNAs (sRNAs) belonging to all known sRNA classes such as microRNAs (miRNA) and small interfering RNA (siRNAs) in response to cold contributes to an understanding of cold-related transcriptome changes.
We subjected A. thaliana plants to cold acclimation conditions (4 °C) and analyzed the sRNA transcriptomes after 3 h, 6 h and 2 d. We found 93 cold responsive differentially expressed miRNAs and only 14 of these were previously shown to be cold responsive. We performed miRNA target prediction for all differentially expressed miRNAs and a GO analysis revealed the overrepresentation of miRNA-targeted transcripts that code for proteins acting in transcriptional regulation. We also identified a large number of differentially expressed cis- and trans-nat-siRNAs, as well as sRNAs that are derived from long non-coding RNAs. By combining the results of sRNA and mRNA profiling with miRNA target predictions and publicly available information on transcription factors, we reconstructed a cold-specific, miRNA and transcription factor dependent gene regulatory network. We verified the validity of links in the network by testing its ability to predict target gene expression under cold acclimation.
In A. thaliana, miRNAs and sRNAs derived from cis- and trans-NAT gene pairs and sRNAs derived from lncRNAs play an important role in regulating gene expression in cold acclimation conditions. This study provides a fundamental database to deepen our knowledge and understanding of regulatory networks in cold acclimation.