High-throughput sequencing of methylated cytosine enriched by modification-dependent restriction endonuclease MspJI
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ABSTRACT:
ORGANISM(S): Arabidopsis thaliana
PROVIDER: GSE46428 | GEO | 2013/05/01
SECONDARY ACCESSION(S): PRJNA200314
REPOSITORIES: GEO
Similar Datasets
Project description:In this study, we combine MspJI digestion and electrophoretic band selection with next generation high-throughput sequencing technology to detect 5-methylcytosines in Arabidopsis genome. By developing a bioinformatics workflow to attribute the CNNR sites recognized by MspJI to the reference genome, we fulfilled the systematic assessment of this method. According to the assessment, here we provide the method for generating a detailed map of plant methylome that could be feasible, reliable and economical in methylation investigation. Extracting the MspJI digested fragments, constructing sequencing library according to the Illumina protocol and sequencing with Illumina HiSeq2000. Repeatability and reproducibility studies were performed between two samples from the same individual. Specificity and sensitivity of the method was examined by comparing our data with WGBS data downloaded from GEO (GSE15922: GSM399600). **The WGBS seq data ('aerial_tissues_BS_seq_CNNR.gff') was generated from the GSM399600 Sample supplementary files ('aerial_tissues_BS_seq_alignment_batch-*.gff.gz') and was utilized to do comparative study with our MspJI-seq data including sensitivity and specificity analysis.
2013-05-01 | E-GEOD-46428 | biostudies-arrayexpress
Project description:N4-methylcytosine is a major DNA modification integral to restriction-modification (R-M) systems in bacterial genomes. Here we describe 4mC-Tet-Assisted Bisulfite-sequencing (4mC-TAB-seq), a method that accurately and rapidly reveals the genome-wide locations of N4-methylcytosines at single-base resolution. By coupling Tet-mediated oxidation with a modified sodium bisulfite conversion reaction, unmodified cytosines and 5-methylcytosines are read out as thymines, whereas N4-methylcytosines are read out as cytosines revealing their positions throughout the genome. 4mC-TAB-seq
2015-07-11 | E-GEOD-63371 | biostudies-arrayexpress
Project description:N4-methylcytosine is a major DNA modification integral to restriction-modification (R-M) systems in bacterial genomes. Here we describe 4mC-Tet-Assisted Bisulfite-sequencing (4mC-TAB-seq), a method that accurately and rapidly reveals the genome-wide locations of N4-methylcytosines at single-base resolution. By coupling Tet-mediated oxidation with a modified sodium bisulfite conversion reaction, unmodified cytosines and 5-methylcytosines are read out as thymines, whereas N4-methylcytosines are read out as cytosines revealing their positions throughout the genome.
2015-07-11 | GSE63371 | GEO
Project description:Biological and economical assessment of autotrophic denitrification with S compounds
| PRJEB43509 | ENA
Project description:BACKGROUND: As a well-known epigenomic modification, DNA methylation is found to be common in plants and plays an important role in many biological processes. Relying on the unique feature of methylation-dependent digestion, the family of methylation-requiring restriction-like endonuclease, such as MspJI and its homologs, was suggested for a potential usage in methylation detection. RESULTS: In this study, we combine MspJI digestion and electrophoretic band selection with next generation high-throughput sequencing technology to detect 5-methylcytosines in Arabidopsis genome. By developing a bioinformatics workflow to attribute the CNNR sites recognized by MspJI to the reference genome, we fulfilled the systematic assessment of this method. CONCLUSIONS: According to the assessment, here we provide the method for generating a detailed map of plant methylome that could be feasible, reliable and economical in methylation investigation.
| S-EPMC3718668 | biostudies-literature
Project description:Binding of transcription factors (TFs) to regulatory sequences is a pivotal step in the control of gene expression. Despite many advances in the characterization of sequence motifs recognized by TFs, our ability to quantitatively predict TF binding to different regulatory sequences is still limited. Here, we present a novel experimental assay termed BunDLE-seq that provides quantitative measurements of TF binding to thousands of fully designed sequences of 200 bp in length within a single experiment. Applying this binding assay to two yeast TFs we demonstrate that sequences outside the core TF binding site profoundly affect TF binding. We show that TF-specific models based on the sequence or DNA shape of the regions flanking the core binding site are highly predictive of the measured differential TF binding. We further characterize the dependence of TF binding, accounting for measurements of single and co-occurring binding events, on the number and location of binding sites and on the TF concentration. Finally, by coupling our in vitro TF binding measurements, and another application of our method probing nucleosome formation, to in vivo expression measurements carried out with the same template sequences now serving and promoters, we offer insights into mechanisms that may determine the different expression outcomes observed. Our assay thus paves the way to a more comprehensive understanding of TF binding to regulatory sequences, and allows the characterization of TF binding determinants within and outside of core binding sites. Binding experiments were carried out with one of two input libraries; Lib1 (also referred to as “main lib”) includes designed sequence variants of length 150bp, and Lib2 (also referred to as “constant flanks lib”) includes designed sequence variants of length 200bp. The sequences of the variants of interest can be found in the second column of the processed data file (BunDLE-seq_data, see 3 excel sheets). EXP1, EXP2 and EXP3 were carried out using Lib1, and EXP4 was carried out using Lib2. Binding experiments were carried out with different proteins (in different concentrations) – DNA was extracted from bound bands that were formed on the gel and amplified with a primer with a unique 5bp upstream tail specifying the identity of the originating band (also referred to as “band barcode”). Data from the following bands was used in the analysis: EXP1_band1, no-protein band – with band barcode “AACGA”, EXP1_band2, single Gcn4 (conc 1:8) bound band* – with band barcode “TCGTA” , EXP1_band3, histones bound band – with band barcode “AGATA”, EXP2_band1, no-protein band – with band barcode “AACGA”, EXP2_band2, single Gcn4 (conc 1:8) bound band* – with band barcode “AGATA”, EXP2_band2, single Gcn4 (conc 1:7) bound band – with band barcode “CACTT”, EXP2_band2, single Gcn4 (conc 1:6) bound band – with band barcode “TCGTA”, EXP2_band2, single Gcn4 (conc 1:5) bound band – with band barcode “CATCA”, EXP2_band2, single Gcn4 (conc 1:4) bound band – with band barcode “TATTA”, EXP2_band2, single Gcn4 (conc 1:3) bound band – with band barcode “AGTCA”, EXP2_band2, single Gcn4 (conc 1:2) bound band – with band barcode “ACGAA”, EXP2_band2, single Gcn4 (conc 1:1) bound band – with band barcode “ACAGA”, EXP2_band2, two Gcn4 (conc 1:1) bound band – barcoded with “GTAGA”, EXP3_band1, no-protein band – with band barcode “GCATA”, EXP3_band2, single Gal4 (conc 1:1) bound band – with band barcode “GATGT”, EXP3_band3, single Gal4 (conc 3:1) bound band – with band barcode “GTTCA”, EXP3_band4, two Gal4 (conc 3:1) bound band – with band barcode “CTCAA”, EXP4_band1, no-protein band – with band barcode “GAGTA”, EXP4_band2, single Gcn4 (conc 1:3) bound band – “TACCA”, EXP4_band3, no-protein band – with band barcode “TCGTT”, EXP4_band3, single Gal4 (conc 3:1) bound band – with band barcode “ACATC”, *biological replicates
2015-03-04 | E-GEOD-66143 | biostudies-arrayexpress
Project description:Implicated in persistence and stress response pathways in bacteria, RelE shuts down protein synthesis by cleaving mRNA within the ribosomal A site. Structural and biochemical studies have shown that RelE cuts with some sequence specificity, which we further characterize here, and that it shows no activity outside the context of the ribosome. We obtained a global view of the effect of RelE on translation by ribosome profiling, observing that ribosomes accumulate on the 5’-end of genes through dynamic cycles of mRNA cleavage, ribosome rescue, and initiation. Moreover, the addition of purified RelE to cell lysates shows promise as a method for generating ribosome footprints. In bacteria, profiling studies have suffered from relatively low resolution and have yielded no information on reading frame due to problems inherent to MNase digestion, the method used to degrade unprotected regions of mRNA. In contrast, we find that RelE yields precise 3’-ends that for the first time reveal reading frame in bacteria. Given that RelE has been shown to function in all three domains of life, RelE has potential to improve reading frame and shed light on A-site occupancy in ribosome profiling experiments more broadly.
2016-10-19 | GSE85540 | GEO
Project description:In sexual organisms, random meiotic recombination between homologous chromosomes is vital to maximize genetic variation among offspring. The sex-determining region (SDR), however, does not undergo recombination, as required for the maintenance of distinct alleles. The contribution of epigenetic versus genetic mechanisms to suppress recombination in SDRs and how the suppression mechanisms evolve remain poorly understood. Here we describe the mechanistic control of meiotic recombination at the mating-type locus (MT) in the green alga Chlamydomonas reinhardtii. We identify a maintenance DNA methyltransferase, DNMT1, mutation of which leads to the depletion of 95% of 5-methylcytosines (5mCs) in the nuclear genome. While the 5mC deficiency causes no discernible alteration in haploid vegetative growth or sexual differentiation, the dnmt1 homozygotes display substantially reduced spore viability and 4-progeny-tetrad frequency. Strikingly, in dnmt1 homozygotes, anomalous meiotic recombination takes place at MT, generating haploid progenies with mixed mating-type harboring both plus and minus markers. Although the repressive histone methylation H3K9me1 at MT is lost concurrently in dnmt1 strains, loss of histone methylation alone by gene deletion of the responsible histone methyltransferase SET3p does not lead to anomalous recombination at MT. Thus, DNA methylation, rather than histone modification, mediates the recombination suppression at MT in C. reinhardtii. This finding suggests that in early eukaryotes, which likely lacked histone-based chromatin modification, DNA methylation may have been co-opted to suppress meiotic recombination between alleles responsible for separate sexes.
2024-08-20 | GSE245613 | GEO
Project description:In sexual organisms, random meiotic recombination between homologous chromosomes is vital to maximize genetic variation among offspring. The sex-determining region (SDR), however, does not undergo recombination, as required for the maintenance of distinct alleles. The contribution of epigenetic versus genetic mechanisms to suppress recombination in SDRs and how the suppression mechanisms evolve remain poorly understood. Here we describe the mechanistic control of meiotic recombination at the mating-type locus (MT) in the green alga Chlamydomonas reinhardtii. We identify a maintenance DNA methyltransferase, DNMT1, mutation of which leads to the depletion of 95% of 5-methylcytosines (5mCs) in the nuclear genome. While the 5mC deficiency causes no discernible alteration in haploid vegetative growth or sexual differentiation, the dnmt1 homozygotes display substantially reduced spore viability and 4-progeny-tetrad frequency. Strikingly, in dnmt1 homozygotes, anomalous meiotic recombination takes place at MT, generating haploid progenies with mixed mating-type harboring both plus and minus markers. Although the repressive histone methylation H3K9me1 at MT is lost concurrently in dnmt1 strains, loss of histone methylation alone by gene deletion of the responsible histone methyltransferase SET3p does not lead to anomalous recombination at MT. Thus, DNA methylation, rather than histone modification, mediates the recombination suppression at MT in C. reinhardtii. This finding suggests that in early eukaryotes, which likely lacked histone-based chromatin modification, DNA methylation may have been co-opted to suppress meiotic recombination between alleles responsible for separate sexes.
2024-08-20 | GSE245612 | GEO