Project description:Identification of factors regulating leaf inclination reveal a complex regulatory network of lamina joint development, however, the dynamic transcriptional programming of it remain to be elucidated. We used microarrays to detail the global gene expression profiles at different developmental stages of lamina joint and identified distinct classes of differentially expressed genes during this process, characterized the regulating factors of rice lamina joint development.
Project description:The leaf lamina joint joins the rice leaf blade and sheath, contributing significantly to the leaf angle trait. A more erect leaf facilitates the penetration of sunlight, enhancing photosynthetic efficiency and occupying less space in dense planting. Genetic screening found a mutant increased leaf angle1, ila1 from rice T-DNA insertional mutants library. We used microarrays to detail the transcriptional profile changes in the mutant ila1 lamina joint. Two biological replicate sample of leaf lamina joints from the ila1 and wild-type plants at tillering stage were collected for RNA extraction. Total RNAs were isolated from each replicate via the TRIzol method (Invitrogen) and used in target synthesis for the Rice Genome Array from Affymetrix. The microarray analyses were performed through following standard protocols (Affymetrix).
Project description:The leaf lamina joint joins the rice leaf blade and sheath, contributing significantly to the leaf angle trait. A more erect leaf facilitates the penetration of sunlight, enhancing photosynthetic efficiency and occupying less space in dense planting. Genetic screening found a mutant increased leaf angle1, ila1 from rice T-DNA insertional mutants library. We used microarrays to detail the transcriptional profile changes in the mutant ila1 lamina joint.
Project description:We identified a key regulator of the rice leaf angle and plant architecture, OsWRKY36, from a rice oswrky mutant library. OsWRKY36 is highly expressed in the leaf lamina joint and promotes cell growth and expansion in adaxial parenchyma cells, leading to a greater leaf angle.
Project description:Spatial organization of chromatin at the nuclear lamina is critical for cellular identity, but mechanisms governing genome-lamina interactions remain unresolved. In particular, it remains unclear if and how mechanical inputs impact genome-lamina interactions. We modeled aspects of laminopathies via siRNA-mediated lamin A/C (LMNA) knockdown to examine how the nuclear lamina and cytoskeleton contribute to loss of lamina-associated domain (LAD) organization. Genomics and imaging analyses reveal spatial positioning of LADs with a specific molecular signature are particularly vulnerable to LMNA reduction. Further, a subset of these LADs retain their lamina-association with either concomitant disruption of the Linker of Nucleoskeleton and Cytoskeleton complex or microtubule depolymerization. Conversely, microtubule stabilization phenocopies spatial positioning changes observed in LMNA-knockdown cells. These data suggest peripheral chromatin organization is regulated by the balance of nuclear lamina and cytoskeletal interactions across the nuclear membrane. In the context of a compromised nuclear lamina, such as LMNA reduction, the cytoskeleton contributes to loss of peripheral chromatin organization.
Project description:A large fraction of the mammalian genome is organized into inactive chromosomal domains associated with the nuclear lamina. Using genomic repositioning assays we show that Lamina associated domains (LADs), spanning the developmentally regulated IgH and Cyp3a loci, contain transportable DNA regions that associate chromatin with the nuclear lamina and repress gene activity in fibroblasts. We characterized DNA regions within LADs that are functionally capable of positioning chromatin domains at the inner nuclear membrane (INM) lamina. We mapped and characterized the IgH and other LADs in murine fibroblasts. We show that these murine LADs have a unique chromatin structure with discrete boundaries. We demonstrate DNA regions within LADs that are capable of directing the association of chromatin domains with the INM-lamina as well as the silencing of a co-integrated reporter gene.
Project description:The angle of rice leaf inclination is an important agronomic trait and closely related to the yield and architecture of crops. Through genetic screening, a rice gain-of-function mutant leaf inclination1, lc1, was identified . Phenotypic analysis confirmed the exaggerated leaf angels of lc1 due to the stimulated cell elongation at the collar.In this series, we compare the transcriptome of zhonghua11 and lc1 collar. The lamina joint (1-cm long) of the flag leaves of lc1 and WT plants were collected and frozen in liquid nitrogen, which were then used for RNAs extraction. The obtained RNA samples were processed as recommended by Affymetrix, including RNA extraction, converting to double-stranded cDNA, and synthesis of biotin-labeled copy RNA. Fifteen micrograms of biotin-labeled copy RNA was purified and fragmented into 35- to 300-nucleotide fragments and then hybridized with a Rice genome array (Affymetrix). The hybridization was performed with two biological replicates for each sample. After hybridization, arrays were scanned using an Agilent GeneArray scanner (Affymetrix G2500A). Microarray data were normalized using the Affymetrix Microarray Suit program (version 5.0). The algorithm absolute call flag was set to indicate the reliability of the data points according to P (present), M (marginal), and A (absent). Significant differences for each gene between the WT and lc1 mutant plants were examined using the Wilcoxon rank test of the Affymetrix Microarray Suit program (P<0.01) and analysis of variance by fitting a mixed model in the MAANOVA package under R 1.8.0 for multiple testing (false discovery rate-corrected P<0.05). Genes with the consensus significant difference in two independent samples were selected and listed. Annotations for the selected probe set identification were rechecked at the Affymetrix website.