Construction and significance of directional expression cDNA library from myeloid leukemia cell line U937

Gang Chen, Wang Gang Zhang, Jie Fu, Xing Mei Cao, Wan Hong Zhao, Ai Zhi Zhao, Yue Heng Han, Fu Yang Li, Xin Ping Liu, Li Bo Yao

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


To construct the cDNA expression library from human U937 cell, total RNA and purified mRNA in myeloid leukemia cell line U937 were extracted. The first and second strand of cDNA were synthesized through reverse transcription. After blunting the cDNA termini, the cDNA fragments were connected with EcoR I adapters, and the end of EcoR I adapters was phosphorylated. Then the cDNAs were digested by Xho I, and the fragments smaller than 400 bp were removed by Sephacryl-S400 spin column, the fragments longer than 400 bp were ligated with lambdaZAP vector. The recombinants were packaged in vitro, and a small portion of packaged phage was used to infect E coli XL1-Blue-MRF' for titration. The recombinants were examined by color selection. In order to evaluate the size of cDNA inserts and the diversity of library, the pBK-CMV phagemid was excised from the ZAP expression vector by using ExAssist helper phage with XLOLR strain, and then the pBK-CMV phagemid was digested by Xho I and EcoR I. The results showed that the U937 cell line cDNA library consisting of 2.87 x 10(6) recombinant bacteriophages was constructed. The average size of exogenous insert in the recombinants was about 1.7 kb. It is concluded that the constructed cDNA library can be used to screen target clones.

Original languageEnglish (US)
Pages (from-to)355-358
Number of pages4
JournalZhongguo shi yan xue ye xue za zhi / Zhongguo bing li sheng li xue hui = Journal of experimental hematology / Chinese Association of Pathophysiology
Issue number4
StatePublished - Aug 2003
Externally publishedYes

ASJC Scopus subject areas

  • Medicine(all)


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