The invention relates to methods for labelling individual nucleic acid molecules present in a sample, comprising contacting the nucleic acid molecules with an adaptor or mixture of adaptors, wherein the adaptor or adaptors comprise one or more universal nucleotide bases and a ligation moiety at their 3′ end, and ligating an adaptor to the nucleic acid of interest, wherein the adaptor is ligated to the nucleic acid molecules at the 3′ end of the adaptor. A random tag is then generated in situ by conducting an extension reaction over the ligated adaptor. Methods of the invention may be used to detect genetic alterations or variants in any nucleic acid with high specificity and high sensitivity, including mutations in nucleic acids such as ctDNA, cfDNA, and in viral, microbiome and plant nucleic acids. Methods of the invention may also be used in detection and correction of errors introduced into nucleic acids during processing.
本发明涉及对样品中存在的单个核酸分子进行标记的方法,包括将核酸分子与适
配体或适
配体混合物接触,其中适
配体或适
配体包括一个或多个通用核苷酸碱基和位于其 3′端的连接分子,以及将适
配体连接到所需核酸,其中适
配体在适
配体的 3′端与核酸分子连接。然后通过在连接的适
配体上进行延伸反应,在原位生成随机标签。本发明的方法可用于高特异性和高灵敏度地检测任何核酸中的
基因改变或变异,包括ctDNA、cfDNA 等核酸以及病毒、微
生物组和植物核酸中的突变。本发明的方法还可用于检测和纠正核酸加工过程中引入的错误。