1. [Construction of T-vectors for the direct, unidirectional cloning and analysis of PCR-amplified promoters].
- Author
-
Wang BL, Li XX, Zheng F, Liu R, Quan JX, Jia HW, Liang H, Deng T, Guo SY, Guo G, Zhang JY, and Qiu MC
- Subjects
- Animals, Base Sequence, Cell Line, DNA Restriction Enzymes chemistry, Genetic Vectors chemistry, Mutagenesis, Mutation, Polymerase Chain Reaction, Rats, Transfection, Cloning, Molecular methods, Genetic Vectors genetics, Promoter Regions, Genetic genetics
- Abstract
The amplification and cloning of promoters are regularly employed procedures to study the mechanism of gene regulation. In the present study we developed a method to construct T-vectors used for the direct and unidirectional cloning and analysis of promoters. These so-called T-vectors pEGFP-T and pGL3-T were derived from their parent promoterless vectors pEGFP-1 and pGL3-basic, respectively. To construct the T-vectors, an AhdI recognition site within the Ampr gene in pGL3-basic was silent mutated using overlap extension PCR. Then, a specially designed AhdI cassette was cloned into the respective parent vectors. The procedures of the T-vector construction involved a strategy to minimize the background of nonrecombinant transformants and to eliminate reverse orientation of the PCR products into the T-vectors. The cloning efficiencies of the two T-vectors were both above 85% when tested with a PCR product amplified from a sequence that was pre-confirmed to be able to initiate transcription, and moreover, the constructs harbored the inserts in a desired orientation at a >90% rate. In transient transfection assays, we demonstrated these T-vectors are functional. Thus, the present study provides an easy method to construct a series of T-vectors used for promoter characterization.
- Published
- 2007