Molecular Biology


    Protocols in Current Issue
    TUNEL Labeling to Detect Double-stranded DNA Breaks in Caenorhabditis elegans Gonads
    Authors:  Peter A. Kropp, Kyle Rhodehouse and Andy Golden, date: 03/20/2022, view: 428, Q&A: 0

    Analysis of DNA double strand breaks (DSBs) is important for understanding dyshomeostasis within the nucleus, impaired DNA repair mechanisms, and cell death. In the C. elegans germline, DSBs are important indicators of all three above-mentioned conditions. Although multiple methods exist to assess apoptosis in the germline of C. elegans, direct

    RNA-mediated in vivo Directed Evolution in Yeast
    Authors:  Emil D. Jensen and Michael K. Jensen, date: 03/05/2022, view: 1371, Q&A: 0

    Directed evolution is a powerful approach to obtain genetically-encoded sought-for traits. Compared to the prolonged adaptation regimes to mutations occurring under natural selection, directed evolution unlocks rapid screening and selection of mutants with improved traits from vast mutated sequence spaces. Many systems have been developed to

    Laser Microirradiation and Real-time Recruitment Assays Using an Engineered Biosensor
    Authors:  Carolina dos Santos Passos, Robert E. Cohen and Tingting Yao, date: 03/05/2022, view: 1569, Q&A: 0

    Double-strand breaks (DSBs) are lesions in DNA that, if not properly repaired, can cause genomic instability, oncogenesis, and cell death. Multiple chromatin posttranslational modifications (PTMs) play a role in the DNA damage response to DSBs. Among these, RNF168-mediated ubiquitination of lysines 13 or 15 at the N-terminal tail of histone H2A

    Measurement of DNA Damage Using the Neutral Comet Assay in Cultured Cells
    Authors:  Elena Clementi, Zuzana Garajova and Enni Markkanen, date: 11/20/2021, view: 1760, Q&A: 0

    Maintenance of DNA integrity is of pivotal importance for cells to circumvent detrimental processes that can ultimately lead to the development of various diseases. In the face of a plethora of endogenous and exogenous DNA damaging agents, cells have evolved a variety of DNA repair mechanisms that are responsible for safeguarding genetic

    Neutral Comet Assay to Detect and Quantitate DNA Double-Strand Breaks in Hematopoietic Stem Cells
    Authors:  Irene Mariam Roy, Pon Sowbhagya Nadar and Satish Khurana, date: 08/20/2021, view: 1642, Q&A: 0

    In vertebrates, hematopoietic stem cells (HSCs) regulate the supply of blood cells throughout the lifetime and help to maintain homeostasis. Due to their long lifespan, genetic integrity is paramount for these cells, and accordingly, a number of stem cell-specific mechanisms are employed. However, HSCs tend to show more DNA damage with increasing

    A Sensitive and Specific PCR-based Assay to Quantify Hepatitis B Virus Covalently Closed Circular (ccc) DNA while Preserving Cellular DNA
    Authors:  Benno Zehnder, Stephan Urban and Thomas Tu, date: 04/20/2021, view: 3848, Q&A: 0

    Hepatitis B virus (HBV) is the major cause of liver diseases and liver cancer worldwide. After infecting hepatocytes, the virus establishes a stable episome (covalently closed circular DNA, or cccDNA) that serves as the template for all viral transcripts. Specific and accurate quantification of cccDNA is difficult because infected cells contain

    Real-time Base Excision Repair Assay to Measure the Activity of the 8-oxoguanine DNA Glycosylase 1 in Isolated Mitochondria of Human Skin Fibroblasts
    Authors:  Daniel Schniertshauer, Daniel Gebhard and Jörg Bergemann, date: 03/20/2021, view: 2428, Q&A: 0

    7,8-dihydro-8-oxoguanine (8-oxoG) is one of the most common and mutagenic oxidative DNA damages induced by reactive oxygen species (ROS). Since ROS is mainly produced in the inner membranes of the mitochondria, these organelles and especially the mitochondrial DNA (mtDNA) contained therein are particularly affected by this damage. Insufficient

    SMART (Single Molecule Analysis of Resection Tracks) Technique for Assessing DNA end-Resection in Response to DNA Damage
    [Abstract] DNA double strand breaks (DSBs) are among the most toxic lesions affecting genome integrity. DSBs are mainly repaired through non-homologous end joining (NHEJ) and homologous recombination (HR). A crucial step of the HR process is the generation, through DNA end-resection, of a long 3′ single-strand DNA stretch, necessary to prime DNA synthesis ...
    Evaluation of the Efficiency of Genome Editing Tools by a Frameshift Fluorescence Protein Reporter
    Authors:  Balaji T. Moorthy, Akhilesh Kumar, Lauren X. Lotenfoe and Fangliang Zhang, date: 05/20/2020, view: 3129, Q&A: 0
    [Abstract] In the last decade, genome editing has been the center of attention as a novel tool for mechanistic investigations and for potential clinical applications. Various genome editing tools like meganucleases, zinc finger nucleases (ZFNs), transcription activator-like effector-based nucleases (TALEN), and the clustered regularly interspaced short ...
    Ex vivo Analysis of DNA Repair Capacity of Human Peripheral Blood Mononuclear Cells by a Modified Host Cell Reactivation Assay
    Authors:  Katja Matt and Jörg Bergemann, date: 08/05/2019, view: 3214, Q&A: 0
    [Abstract] The ability of humans to repair DNA damages decreases with increasing age. In order to be able to repair daily occurring DNA damages, it becomes more and more important to preserve repair capability of cells with aging. The preservation of DNA repair processes contributes to preventing DNA mutations and subsequently the onset of age-related ...

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