Disclosed are methods and systems for determining the three-dimensional structure of chromatin in eukaryotic cells. More specifically, disclosed are methods and systems for obtaining chromatin structural information by surface immobilization that includes tethering crosslinked protein:DNA complexes and/or ligated DNA complexes to media such as beads, gels, and or matrices during the conformation capture assay. In general, the method includes flash freezing a cell such that the structural organization of the chromatin or other protein:DNA complexes is preserved, cryomilling the cell, producing cross-linked protein:DNA complexes by cutting the chromatin using a chemical, physical or enzymatic method, substantially immobilizing the cross-linked protein:DNA complexes, ligating the cross-linked protein:DNA complexes intramolecularly such that the ligated protein:DNA complexes represent structural organization of the chromatin; characterizing the ligated DNA by sequencing or other methods; and identifying any structural organization of the chromatin. The structural organization preferably includes information relating to interacting loci of the chromatin.
公开了用于确定真核细胞中染色质三维结构的方法和系统。更具体地说,所公开的是通过表面固定化获得染色质结构信息的方法和系统,包括在构象捕获测定过程中将交联的蛋白质:DNA 复合物和/或连接的 DNA 复合物拴系到珠子、凝胶和或基质等介质上。一般来说,该方法包括闪速冷冻细胞,以保留染色质或其他蛋白质:DNA 复合物的结构组织;冷冻细胞;使用
化学、物理或酶方法切割染色质,产生交联的蛋白质:DNA 复合物;将交联的蛋白质:DNA 复合物基本固定;将交联的蛋白质:DNA 复合物连接到基质上:DNA复合物,将交联的蛋白质:DNA复合物在分子内连接,使连接的蛋白质:DNA复合物代表染色质的结构组织;通过测序或其他方法对连接的DNA进行表征;以及鉴定染色质的任何结构组织。结构组织最好包括与染色质相互作用位点有关的信息。