Construction and Identification of the cDNA Expression Library for Human Esophageal Cancer Cells

Objective To construct a cDNA phage expression library for human esophageal cancer cells. Methods After the total RNA were obtained from esophageal cancer cells, the mRNA were separated with magnetic beads adsorption method, and the single-strand and double-strand cDNA were synthesized through reverse transcription. With the undesirable cDNA fragments removed, the remaining cDNA (linked withEcoRⅠ aptamer and phosphorylated its 5′end) combined with the carrier of T7 Select10-3b. The recombinant phage were packaged in vitro for preliminary cDNA library. PCR was used to identify the size of inserted cDNA. Results The constructed original cDNA phage expression library for human esophageal cancer cells was consisted of 2.01×106 pfu/mL bacteriophages with a recombination rate of 100%. The length of the inserted cDNA fragments were range from 300 bp to 1 500 bp. Conclusion The cDNA phage expression library of human esophageal cell is successfully constructed to meet the currently recognized standards, and can be well used to screen cDNA-cloned genes of human esophageal cancer antigens by serological analysis of recombinantly expressed cDNA clone (SEREX).