[Rapid construction and identification of full-length cDNA library of human glioma tissues].

ABSTRACT

OBJECTIVE: To explore a method for rapid construction of a full-length cDNA library of human glioma tissues using switching mechanism at 5' end of RNA transcript (SMART). METHODS: The total RNA was extracted from several samples of human glioma tissues and the mRNA was subsequently separated. Multiple mRNA samples were mixed to be used as the template for the first-strand cDNA synthesis. The CDS /3' PCR primer (containing Sfi IB site) was used in the first-strand reaction, and the SMART IV Oligo(dT) (containing Sfi A site) served as the short, extended template at the 5' end of the mRNA. With the above two primers, the primer-extension step generated full-length double-strand cDNA, which was digested by Sfi I restriction enzyme and ligated to the Sfi I A & B -digested lambdaTriplEx2 vector. The ligated vector was then packaged by lambda packaging extract for the final construction of the cDNA library. RESULTS: The unamplified human glioma cDNA library consisted of 2.4x10(6) independent clones with a recombination rate of 100%. The titer of the amplified cDNA library was 4.5x10(9) pfu/ml, and the average exogenous inserts of the recombinants was 1.2 kb in length. CONCLUSION: A high-quality full-length cDNA library of human gliomas was constructed successfully, which may facilitate further study of the screening and cloning of new tumor suppressor genes and tissue-specific genes of human glioma.