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Single-Molecule Mapping of Chromatin Accessibility Using NOMe-seq/dSMF.
The bulk of gene expression regulation in most organisms is accomplished through the action of transcription factors (TFs) on cis-regulatory elements (CREs). In eukaryotes, these CREs are generally characterized by nucleosomal depletion and thus higher physical accessibility of DNA. Many methods exploit this property to map regions of high average accessibility, and thus putative active CREs, in bulk. However, these techniques do not provide information about coordinated patterns of accessibility along the same DNA molecule, nor do they map the absolute levels of occupancy/accessibility. SMF (Single-Molecule Footprinting) fills these gaps by leveraging recombinant DNA cytosine methyltransferases (MTase) to mark accessible locations on individual DNA molecules. In this chapter, we discuss current methods and important considerations for performing SMF experiments.
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