DNA Methylation-Based High-Resolution Mapping of Long-Distance Chromosomal Interactions in Nucleosome-Depleted Regions (MeDIP)

Here, we present Methyltransferase Targeting-based chromosome Architecture Capture (MTAC), a method that maps the contacts between a target site (viewpoint) and the rest of the genome with high resolution and sensitivity. By targeting M.CviPI DNA methyltransferase to the viewpoint and by detecting differentially methylated regions, MTAC detects hundreds of intra- and inter-chromosomal interactions in the budding yeast genome that cannot be captured by 4C, Hi-C, or Micro-C.本研究报道了基于甲基转移酶靶向的染色体构象捕获（Methyltransferase Targeting-based chromosome Architecture Capture，MTAC）技术，该方法可在高分辨率与高灵敏度水平下，绘制靶位点（viewpoint，亦称视角位点）与基因组其余区域之间的染色质相互接触图谱。通过将M.CviPI DNA甲基转移酶（M.CviPI DNA methyltransferase）靶向至该视角位点，并检测差异甲基化区域，MTAC能够在酿酒酵母基因组中检测到数百条染色体内及染色体间相互作用，而此类相互作用无法被4C、Hi-C或Micro-C捕获。