Systems Biology


    Protocols in Current Issue
    Detecting Differentially Methylated Promoters in Genes Related to Disease Phenotypes Using R
    Authors:  Jordi Martorell Marugán and Pedro Carmona-Sáez, date: 06/05/2021, view: 1028, Q&A: 0

    DNA methylation in gene promoters plays a major role in gene expression regulation, and alterations in methylation patterns have been associated with several diseases. In this context, different software suites and statistical methods have been proposed to analyze differentially methylated positions and regions. Among them, the novel statistical

    Simplified Epigenome Profiling Using Antibody-tethered Tagmentation
    Authors:  Steven Henikoff, Jorja G. Henikoff and Kami Ahmad, date: 06/05/2021, view: 1223, Q&A: 0

    We previously introduced Cleavage Under Targets & Tagmentation (CUT&Tag), an epigenomic profiling method in which antibody tethering of the Tn5 transposase to a chromatin epitope of interest maps specific chromatin features in small samples and single cells. With CUT&Tag, intact cells or nuclei are permeabilized, followed by successive

    Quantitative ChIP-seq by Adding Spike-in from Another Species
    Authors:  Kongyan Niu, Rui Liu and Nan Liu, date: 08/20/2018, view: 17341, Q&A: 0
    [Abstract] Chromatin immunoprecipitation followed by sequencing (ChIP-seq) is a routine procedure in the lab; however, epigenome-wide quantitative comparison among independent ChIP-seq experiments remains a challenge. Here, we contribute an experimental protocol combined with a computational workflow allowing quantitative and comparative assessment of ...
    Tethered Chromosome Conformation Capture Sequencing in Triticeae: A Valuable Tool for Genome Assembly
    Authors:  Axel Himmelbach, Ines Walde, Martin Mascher and Nils Stein, date: 08/05/2018, view: 5879, Q&A: 0
    [Abstract] Chromosome conformation capture sequencing (Hi-C) is a powerful method to comprehensively interrogate the three-dimensional positioning of chromatin in the nucleus. The development of Hi-C can be traced back to successive increases in the resolution and throughput of chromosome conformation capture (3C) (Dekker et al., 2002). The basic ...
    Quantifying Symmetrically Methylated H4R3 on the Kaposi’s Sarcoma-associated Herpesvirus (KSHV) Genome by ChIP-Seq
    Authors:  Roxanne C. Strahan, Kayla S. Hiura and Subhash C. Verma, date: 03/20/2018, view: 5183, Q&A: 0
    [Abstract] Post-translational modifications to histone tails contribute to the three-dimensional structure of chromatin and play an important role in determining the relative expression of nearby genes. One such modification is symmetric di-methylation of arginine residues, which may exhibit different effects on gene expression including blocking the binding ...
    Reduced Representation Bisulfite Sequencing in Maize
    Authors:  Fei-Man Hsu, Chung-Ju Rachel Wang and Pao-Yang Chen, date: 03/20/2018, view: 5569, Q&A: 0
    [Abstract] DNA methylation is an epigenetic modification that regulates plant development (Law and Jacobsen, 2010). Whole genome bisulfite sequencing (WGBS) is a state-of-the-art method for profiling genome-wide methylation patterns with single-base resolution (Cokus et al., 2008). However, for an organism with a large genome, e.g., the 2.1 ...
    Coupling Exonuclease Digestion with Selective Chemical Labeling for Base-resolution Mapping of 5-Hydroxymethylcytosine in Genomic DNA
    Authors:  Aurélien A. Sérandour, Stéphane Avner and Gilles Salbert, date: 03/05/2018, view: 5210, Q&A: 0
    [Abstract] This protocol is designed to obtain base-resolution information on the level of 5-hydroxymethylcytosine (5hmC) in CpGs without the need for bisulfite modification. It relies on (i) the capture of hydroxymethylated sequences by a procedure known as ‘selective chemical labeling’ (see Szulwach et al., 2012) and (ii) the digestion of the ...
    Low-input Capture-C: A Chromosome Conformation Capture Assay to Analyze Chromatin Architecture in Small Numbers of Cells
    Authors:  A. Marieke Oudelaar, Damien J. Downes, James O.J. Davies and Jim R. Hughes, date: 12/05/2017, view: 9117, Q&A: 2
    [Abstract] Chromosome conformation capture (3C) techniques are crucial to understanding tissue-specific regulation of gene expression, but current methods generally require large numbers of cells. This protocol describes two new low-input Capture-C approaches that can generate high-quality 3C interaction profiles from 10,000-20,000 cells, depending on the ...
    Bioinformatic Analysis for Profiling Drug-induced Chromatin Modification Landscapes in Mouse Brain Using ChlP-seq Data
    Authors:  Yong-Hwee Eddie Loh, Jian Feng, Eric Nestler and Li Shen, date: 02/05/2017, view: 8435, Q&A: 0
    [Abstract] Chromatin immunoprecipitation followed by massively parallel sequencing (ChIP-seq) is a powerful technology to profile genome-wide chromatin modification patterns and is increasingly being used to study the molecular mechanisms of brain diseases such as drug addiction. This protocol discusses the typical procedures involved in ChIP-seq data ...
    Whole Genome Bisulfite Sequencing and DNA Methylation Analysis from Plant Tissue
    Authors:  Daniela Pignatta, George W. Bell and Mary Gehring, date: 02/20/2015, view: 17099, Q&A: 0
    [Abstract] This protocol describes whole genome bisulfite-sequencing library preparation from plant tissue and subsequent data analysis. Allele-specific methylation analysis and genome-wide identification of differentially methylated regions are additional features of the analysis procedure.

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