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Rapid verification of lambda-cDNA clones using mixed-base oligonucleotide as screening probe and sequencing primer
1Department of Medical Research, Veterans General Hospital, Taipei, Taiwan, Republic of China.
Proceedings of the National Science Council, Republic of China. Part B, Life Sciences
|December 1, 1990
Summary
Researchers developed a fast method to isolate and verify complementary DNA (cDNA) clones using synthetic probes and polymerase chain reaction (PCR). This technique enables direct sequencing for clone verification, successfully characterizing a platelet aggregation inhibitor gene.
Area of Science:
- Molecular Biology
- Gene Cloning
- Biochemistry
Background:
- Isolating and verifying complementary DNA (cDNA) clones from libraries is crucial for gene characterization.
- Traditional methods can be time-consuming and labor-intensive.
- Efficient cloning techniques are needed for rapid gene analysis.
Purpose of the Study:
- To develop a rapid and efficient procedure for isolating and verifying cDNA clones.
- To enable direct sequence analysis of cloned cDNA inserts for authenticity verification.
- To apply the method for cloning and characterizing a specific gene.
Main Methods:
- Utilized synthetic mixed-base oligonucleotides as screening probes in plaque hybridization based on partial amino acid sequences.
- Employed polymerase chain reaction (PCR) with vector-flanking primers to amplify cDNA inserts.
- Performed nucleotide sequence analysis using the amplified DNA and the same oligonucleotides as sequencing primers.
Main Results:
- Successfully isolated and verified cDNA clones using the developed rapid procedure.
- Amplified cDNA inserts directly via PCR for subsequent analysis.
- Achieved direct sequencing through the known amino acid sequence region for clone verification.
- Successfully cloned and partially characterized the gene for a platelet aggregation inhibitor.
Conclusions:
- The developed procedure offers a rapid and effective method for cDNA clone isolation and verification.
- The integration of plaque hybridization, PCR amplification, and direct sequencing streamlines the cloning process.
- This approach facilitates the efficient characterization of genes, including those encoding important proteins like platelet aggregation inhibitors.