申请人:E. I. Du Pont de Nemours and Company
公开号:US05102785A1
公开(公告)日:1992-04-07
The method described characterizes each DNA segment to be mapped by cleaving it to produce DNA fragments which are then end labeled with a reporter(s) specific to the end nucleotides of each fragment. The labeled fragments are again cleaved to produce short fragments which are separated according to size. The short fragments are analyzed as to report identify and size which is indicative of the character of each fragment. By derivatizing the cleaved ends of the primary cleaved fragments, the labeling may be delayed until the second cleavage. Prior to the labeling the derivatized fragments, all underivatized fragments are removed, the derivatized fragments being immobilized.
描述的方法是通过将每个要映射的DNA片段切割,产生DNA片段,然后用特定于每个片段末端核苷酸的报告物质对其进行末端标记来表征每个DNA片段。标记的片段再次被切割,产生根据大小分离的短片段。这些短片段被分析以确定报告的标识和大小,这表明了每个片段的特性。通过对初级切割片段的切割末端进行衍生化,标记可以延迟到第二次切割之前。在对衍生化片段进行标记之前,所有未衍生化的片段都被去除,衍生化的片段被固定。