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 reporter identity 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 labeling the derivatized fragments, all underivatized fragments are removed, the derivatized fragments being immobilized.
所述方法通过裂解 DNA 片段产生 DNA 片段,然后用特异于每个片段末端核苷酸的报告物对其进行末端标记,从而确定要绘制的每个 DNA 片段的特征。标记后的片段再次裂解,产生短片段,并根据大小将其分离。对短片段进行分析,以确定报告
基因的特性和大小,这表明了每个片段的特性。通过对初级裂解片段的裂解末端进行衍生处理,可将标记延迟到第二次裂解。在对衍生片段进行标记之前,先移除所有未充分活化的片段,然后固定衍生片段。