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- W2470605957 abstract "Non-invasive methods for mapping chromatin structure are necessary for creating an accurate view of genome function and dynamics in vivo. Ectopic induction of cytosine-5 DNA methyltransferases (C5 MTases) in Saccharomyces cerevisiae is a powerful technique for probing chromatin structure with minimal disruption to yeast physiology. Accessibility of MTases to their cognate sites is impaired based on the strength and span of the protein–DNA interaction to be probed. Methylated cytosines that resist chemical deamination are detected positively by the PCR-based technique of bisulfite genomic sequencing. PCR amplicons can be sequenced directly yielding an average m5C frequency or accessibility of each target site within the population, a technique termed methyltransferase accessibility protocol (MAP). More recently, the sequencing of cloned molecules in MAP for individual templates (MAPit) enables assignment of the methylation status of each target site along a continuous DNA strand from a single cell. The unique capability to score methylation at multiple sites in single molecules permits detection of inherent structural variability in chromatin. Here, MAPit analysis of the repressed and induced PHO5 promoter of budding yeast, using a C5 MTase with dinucleotide recognition specificity, reveals considerable cell-to-cell heterogeneity in chromatin structure. Substantial variation is observed in the extent to which the MTase gains entry to each of the nucleosomes positioned at PHO5, suggesting differences in their intrinsic thermodynamic stability in vivo. MAPit should be readily adaptable to the analysis of chromatin structure and non-histone protein–DNA interactions in a variety of model systems." @default.
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- W2470605957 date "2009-01-01" @default.
- W2470605957 modified "2023-10-13" @default.
- W2470605957 title "DNA Methyltransferase Probing of Chromatin Structure Within Populations and on Single Molecules" @default.
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- W2470605957 doi "https://doi.org/10.1007/978-1-59745-190-1_4" @default.
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