Piao Y, Ko N T, Lim M K, Ko M S
Developmental Genomics and Aging Section, Laboratory of Genetics, National Institute on Aging, National Institutes of Health, Baltimore, Maryland 21224, USA.
Genome Res. 2001 Sep;11(9):1553-8. doi: 10.1101/gr.185501.
Here we report a novel design of linker primer that allows one to differentially amplify long tracts (average 3.0 kb with size ranges of 1-7 kb) or short DNAs (average 1.5 kb with size ranges of 0.5-3 kb) from a complex mixture. The method allows one to generate cDNA libraries enriched for long transcripts without size selection of insert DNAs. One representative library from newborn kidney includes 70% of clones bearing ATG start codons. A comparable library has been generated from 20 mouse blastocysts, containing only approximately 40 ng of total RNA. This universal PCR amplification scheme can provide a route to isolate very large cDNAs, even if they are expressed at very low levels.
在此,我们报告了一种新型接头引物设计,该设计可使人们从复杂混合物中差异扩增长片段(平均3.0 kb,大小范围为1 - 7 kb)或短DNA(平均1.5 kb,大小范围为0.5 - 3 kb)。该方法使人们能够生成富含长转录本的cDNA文库,而无需对插入DNA进行大小选择。一个来自新生小鼠肾脏的代表性文库包含70%带有ATG起始密码子的克隆。已从20个小鼠囊胚中生成了一个类似的文库,其总RNA仅约40 ng。这种通用的PCR扩增方案可为分离非常大的cDNA提供一条途径,即使它们的表达水平非常低。