{"lab": {"@type": ["Lab", "Item"], "status": "current", "title": "Keji Zhao, NHLBI", "correspondence": [{"contact_email": "emhhb2tAbmhsYmkubmloLmdvdg==", "@id": "/users/44d2c6b9-15a0-4991-b84e-601e432df30f/", "display_title": "Keji Zhao"}], "uuid": "8017f1c9-8877-43b4-8cd5-c695621e78e5", "display_title": "Keji Zhao, NHLBI", "@id": "/labs/keji-zhao-lab/", "pi": {"error": "no view permissions"}, "principals_allowed": {"view": ["system.Everyone"], "edit": ["group.admin", "role.lab_submitter", "submits_for.8017f1c9-8877-43b4-8cd5-c695621e78e5"]}}, "tags": ["4DN Joint Analysis 2018"], "award": {"description": "TCPA: Most current techniques for genome-wide analysis of chromatin interactions are based on the \nchromosome conformation capture (3C) technique. Because the traditional Hi-C technique uses a 6-bp restriction enzyme to cut chromatin, which usually finds one cleavage site every 5000bp in the genome, it does not have sufficient resolution for identification of enhancer-promoter interactions. Significant improvement has been achieved by the in situ Hi-C protocol, which uses a 4-bp cutter enzyme and reaches a resolution of about 1kb, thus enabling identification of specific enhancer-promoter interactions at high-resolution. However, this method requires a costly sequencing depth of 5 to 10 billions of paired-end tags (PETs) per library, which prohibits its application to a large number of samples. Other 3C-based techniques have been developed to focus on interactions at selected regions by capture Hi-C or tethered through specific proteins by ChIA-PET have helped to increase resolution by focusing on potential regulatory regions of the genome. However, a recent study compared \nchromatin interactions detected by fluorescence in situ hybridization (FISH) and 3C-based assays and found a high degree of discrepancy between the two techniques, suggesting that cross-validation of interaction data using different strategies is critical. \nWe propose to develop a novel technique, TrAC-loop, for Transposition-mediated Analysis of \nChromatin loops in the genome. The method does not require SDS-mediated partial decondensation of chromatin, restriction enzyme digestion, or proximity-based ligation of chromatin fragments. TrAC-loop directly captures interacting chromatin regions by Tn5-mediated transposition of a bivalent ME (mosaic end) linker without disrupting the nuclear structure. Thus, this novel strategy avoids potential artifacts derived from SDS-mediated partial decondensation of chromatin, restriction enzyme digestion and proximity-based re-ligation of chromatin fragments that are used in the 3C assays. Our strategy represents a shift in paradigm. All other genome-wide methods of mapping chromatin interactions use 3C-based techniques, whereas ours use transposition. 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