Systems Biology

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    Protocols in Current Issue
    Genome-wide Estimation of Evolutionary Distance and Phylogenetic Analysis of Homologous Genes
    Authors:  Meixia Zhao, Biao Zhang, Jianxin Ma and Damon Lisch, date: 12/05/2018, view: 141, Q&A: 0
    Homologous genes, including paralogs and orthologs, are genes that share sequence homologies within or between different species. Homologous genes originate from a common origin through speciation, genetic duplication or horizontal gene transfer. ...
    Genome-wide Estimation of Evolutionary Distance and Phylogenetic Analysis of Homologous Genes
    Authors:  Meixia Zhao, Biao Zhang, Jianxin Ma and Damon Lisch, date: 12/05/2018, view: 141, Q&A: 0
    [Abstract] Homologous genes, including paralogs and orthologs, are genes that share sequence homologies within or between different species. Homologous genes originate from a common origin through speciation, genetic duplication or horizontal gene transfer. Estimation of the sequence divergence of homologous genes help us to understand divergence time, which ...
    Use of Gas Chromatography to Quantify Short Chain Fatty Acids in the Serum, Colonic Luminal Content and Feces of Mice
    [Abstract] Short-Chain Fatty Acids (SCFAs) are a product of the fermentation of resistant starches and dietary fibers by the gut microbiota. The most important SCFA are acetate (C2), propionate (C3) and butyrate (C4). These metabolites are formed and absorbed in the colon and then transported through the hepatic vein to the liver. SCFAs are more concentrated ...
    Stable-isotope Labeled Metabolic Analysis in Drosophila melanogaster: From Experimental Setup to Data Analysis
    Authors:  Yuping Cai, Nan Liu and Zheng-Jiang Zhu, date: 09/20/2018, view: 501, Q&A: 0
    [Abstract] Stable-isotope labeled metabolic analysis is an essential methodology to characterize metabolic regulation during biological processes. However, the method using stable-isotope-labeled tracer (e.g., 13C-glucose) in live animal is only beginning to be developed. Here, we contribute a qualitative metabolic labeling experiment ...
    Quantitative ChIP-seq by Adding Spike-in from Another Species
    Authors:  Kongyan Niu, Rui Liu and Nan Liu, date: 08/20/2018, view: 844, 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: 779, 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 ...
    Bacterial Microcolonies in Gel Beads for High-throughput Screening
    Author:  Yolanda Schaerli, date: 07/05/2018, view: 1737, Q&A: 0
    [Abstract] High-throughput screening of a DNA library expressed in a bacterial population for identifying potentially rare members displaying a property of interest is a crucial step for success in many experiments such as directed evolution of proteins and synthetic circuits and deep mutational scanning to identify gain- or loss-of-function mutants.
    ...
    Extraction and 16S rRNA Sequence Analysis of Microbiomes Associated with Rice Roots
    Authors:  Joseph Edwards, Christian Santos-Medellín and Venkatesan Sundaresan, date: 06/20/2018, view: 1901, Q&A: 0
    [Abstract] Plant roots associate with a wide diversity of bacteria and archaea across the root-soil spectrum. The rhizosphere microbiota, the communities of microbes in the soil adjacent to the root, can contain up to 10 billion bacterial cells per gram of soil (Raynaud and Nunan, 2014) and can play important roles for the fitness of the host plant. Subsets ...
    Transient Expression Assay in NahG Arabidopsis Plants Using Agrobacterium tumefaciens
    Authors:  Pepe Cana-Quijada, Eduardo R. Bejarano, Rosa Lozano-Durán and Tábata Rosas-Díaz, date: 06/20/2018, view: 1322, Q&A: 0
    [Abstract] Agrobacterium-mediated transient expression has greatly contributed to research in molecular plant biology but has low efficiency and inconsistency in Arabidopsis thaliana (Arabidopsis). Here, we describe a simple, efficient and fast protocol to make transient gene expression in NahG Arabidopsis plants using ...
    Single-step Precision Genome Editing in Yeast Using CRISPR-Cas9
    [Abstract] Genome modification in budding yeast has been extremely successful largely due to its highly efficient homology-directed DNA repair machinery. Several methods for modifying the yeast genome have previously been described, many of them involving at least two-steps: insertion of a selectable marker and substitution of that marker for the intended ...
    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: 1570, 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 ...



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