go to jove.com

HIGH SCHOOL

Biology

Concept Videos

Molecular Biology

This is a free preview. For full access

Studying DNA and RNA

Finding cDNA Ends with RACE PCR

Description

Rapid Amplification of cDNA Ends, or RACE, helps scientists capture the full-length cDNA from an mRNA sequence. It works by linking a known internal region to the unknown sequence at either the 5' end or the 3' end. The method is widely used when the missing end of a gene needs to be identified.

...

Transcript

首次发现新的 mRNA 基因转录本时,未必总能获得全长 cDNA。mRNA 模板末端的未知序列可能导致 cDNA 克隆不完整。

这些部分cDNA的序列可以通过一种称为cDNA末端快速扩增(RACE)的技术进行延伸,从而获得该转录本的完整cDNA。

在此技术中,采用锚定PCR从已知的内部位点克隆至mRNA的3'端或5'端缺失的序列。

在3’ RACE中,以mRNA为模板,利用逆转录酶和一种由寡聚dT序列与一个称为锚定序列的特异性核苷酸序列连接而成的杂合引物合成cDNA。

寡聚-dT 结合成熟 mRNA 3’端的多聚A尾,而引物的锚定部分则在新合成的第一条 cDNA 链的多聚T序列上游添加一组独特的核苷酸。

使用一种基因...

Tags

More videos by Standards