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    A molecular beacon assay for measuring base excision repair activities.

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    Authors
    Maksimenko, Andrei
    Ishchenko, Alexander A
    Sanz, Guenhaël
    Laval, Jacques
    Elder, Rhoderick H
    Saparbaev, Murat K
    Affiliation
    BioAlliance Pharma SA, 59, Bvd du Général Martial Valin, 75015 Paris, France.
    Issue Date
    2004-06-18
    
    Metadata
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    Abstract
    The base excision repair (BER) pathway plays a key role in protecting the genome from endogenous DNA damage. Current methods to measure BER activities are indirect and cumbersome. Here, we introduce a direct method to assay DNA excision repair that is suitable for automation and industrial use, based on the fluorescence quenching mechanism of molecular beacons. We designed a single-stranded DNA oligonucleotide labelled with a 5'-fluorescein (F) and a 3'-Dabcyl (D) in which the fluorophore, F, is held in close proximity to the quencher, D, by the stem-loop structure design of the oligonucleotide. Following removal of the modified base or incision of the oligonucleotide, the fluorophore is separated from the quencher and fluorescence can be detected as a function of time. Several modified beacons have been used to validate the assay on both cell-free extracts and purified proteins. We have further developed the method to analyze BER in cultured cells. As described, the molecular beacon-based assay can be applied to all DNA modifications processed by DNA excision/incision repair pathways. Possible applications of the assay are discussed, including high-throughput real-time DNA repair measurements both in vitro and in living cells.
    Citation
    A molecular beacon assay for measuring base excision repair activities. 2004, 319 (1):240-6 Biochem. Biophys. Res. Commun.
    Journal
    Biochemical and Biophysical Research Communications
    URI
    http://hdl.handle.net/10541/78137
    DOI
    10.1016/j.bbrc.2004.04.179
    PubMed ID
    15158468
    Type
    Article
    Language
    en
    ISSN
    0006-291X
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.bbrc.2004.04.179
    Scopus Count
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    All Paterson Institute for Cancer Research

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