Project description:To explore the overall long noncoding RNA (lncRNA) involved in growth and development of Arabidopsis thaliana across the lifespan, we deeply sequenced samples of whole plants from different developmental stages (4 rosette leaves>1mm, 14 rosette leaves>1mm, rosette growth complete, first flower buds visible, flourishing florescence, first silique shattered, senescence) using strand-specific RNA sequencing (ssRNA-seq) menthod. We obtained 28.8 Gb raw data and identified 156 novel lncRNAs (unreported in all public plant lncRNA databases) . We also categorized the novel lncRNAs as intergenic, intronic, antisense, overlapped with perhaps pseudogenes and mRNA based on their location on the Arabidopsis genome. Furthermore, lncRNAs targeted protein-coding genes were predicted and functional annotated. In addition, we constructed a network of interactions between ncRNAs (miRNAs, lncRNA) and mRNAs. Our results suggest that the identified novel lncRNAs are important in modulating development process of Arabidopsis, and provide a rich resource for further research on the function of these novel lncRNAs.
Project description:To study the genes regulated by transcription factor SQUAMOSA PROMOTER BINDING PROTEIN-LIKE7 (SPL7) in Arabidopsis thaliana, we conducted chromatin immunoprecipitation-based sequencing (ChIP-seq) in 35S:FALG-SPL7 transgenic plant and spl7 mutant, and genome-wide sequencing-based transcript profiling of Arabidopsis thaliana wild-type plants and of spl7 mutant under MS medium and MS supplement with 5µM CuSO4. These experiments led to the identification of genes that are direct target of SPL7 and genes differentially expressed in an SPL7-dependent or Cu-dependent manner. This study provides a framework for the identification of SPL7 regulated genes towards characterization of SPL7 in copper homeostasis.
Project description:DNA methylation is involved in many biological processes during plant growth and development. Here, we report a novel annual growth rhythm that is found in cotton plants grown in different time-of-year. To further study this rhythm in other plants, we use Arabidopsis thaliana for genome-wide bisulfite sequencing.
Project description:Genomic integrity requires faithful chromosome duplication. Origins of replication are the genomic sites where DNA replication initiates in every cell cycle. There are multiple origins scattered throughout the eukaryotic genome whose genome-wide identification has been a hard challenge, especially in multicellular organisms. Thus, very little is known on the distinctive features of origins in terms of DNA sequence and chromatin context at a genomic scale. Here we have profiled origins in Arabidopsis thaliana by high-throughput sequencing of purified nascent DNA strands. We have identified 1543 replication origins, which were uniformly distributed across the Arabidopsis genome and enriched in binding signals of two replication initiation proteins, CDC6 and ORC1. We have also analyzed novel epigenome maps of various histone modifications and found links between origins and epigenetic signatures, which differ from or have not been reported for other eukaryotic systems. Arabidopsis origins tend to be embedded in G+C-rich regions within the 5’ half of genes, enriched in histone H2A.Z, H3K4me2/3 and acetylated H4, and depleted of H3K4me1 and H3K9me2. Our data establish the basis for the understanding of the epigenetic specification of origins of replication in Arabidopsis and have implications for the mechanisms of origin specification in other eukaryotes. This SuperSeries is composed of the SubSeries listed below.