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JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
Solid-State Nanopore Analysis of Diverse DNA Base Modifications Using a Modular Enzymatic Labeling Process.
Nano Letters 2017 November 9
Many regulated epigenetic elements and base lesions found in genomic DNA can both directly impact gene expression and play a role in disease processes. However, due to their noncanonical nature, they are challenging to assess with conventional technologies. Here, we present a new approach for the targeted detection of diverse modified bases in DNA. We first use enzymatic components of the DNA base excision repair pathway to install an individual affinity label at each location of a selected modified base with high yield. We then probe the resulting material with a solid-state nanopore assay capable of discriminating labeled DNA from unlabeled DNA. The technique features exceptional modularity via selection of targeting enzymes, which we establish through the detection of four DNA base elements: uracil, 8-oxoguanine, T:G mismatch, and the methyladenine analog 1,N6 -ethenoadenine. Our results demonstrate the potential for a quantitative nanopore assessment of a broad range of base modifications.
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