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qDSB-Seq is a general method for genome-wide quantification of DNA double-strand breaks using sequencing
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qDSB-Seq is a general method for genome-wide quantification of DNA double-strand breaks using sequencing
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Journal Article
qDSB-Seq is a general method for genome-wide quantification of DNA double-strand breaks using sequencing
2019
Overview
DNA double-strand breaks (DSBs) are among the most lethal types of DNA damage and frequently cause genome instability. Sequencing-based methods for mapping DSBs have been developed but they allow measurement only of relative frequencies of DSBs between loci, which limits our understanding of the physiological relevance of detected DSBs. Here we propose quantitative DSB sequencing (qDSB-Seq), a method providing both DSB frequencies per cell and their precise genomic coordinates. We induce spike-in DSBs by a site-specific endonuclease and use them to quantify detected DSBs (labeled, e.g., using i-BLESS). Utilizing qDSB-Seq, we determine numbers of DSBs induced by a radiomimetic drug and replication stress, and reveal two orders of magnitude differences in DSB frequencies. We also measure absolute frequencies of Top1-dependent DSBs at natural replication fork barriers. qDSB-Seq is compatible with various DSB labeling methods in different organisms and allows accurate comparisons of absolute DSB frequencies across samples.
Measuring relative frequencies of DNA double-strand breaks between loci does not provide the full physiological relevance of those breaks. Here Rowicka and colleagues present qDSB-Seq method which uses spike-in double-strand breaks induced by a restriction enzyme to accurately quantify DNA damage.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
