A Rapid PCR-Based Colony Screening Protocol for Cloned Inserts
Following transformation of a ligation reaction into competent E. coli cells, successful subclones are conventionally identified by two methods. The first involves preparing “mini-prep” plasmid DNA from a number of colonies and then identifying the desired recombinant plasmid on the basis of either its unique restriction enzyme digest pattern or by direct DNA sequencing. The second, often used when large numbers of putative recombinants are involved, is by colony hybridization with a labeled probe. In this chapter an alternative PCR-based method for direct screening of transformants is described that is both facile and rapid, completely circumventing time-consuming DNA plasmid preparations. In its simplest form described below, transformed colonies are directly tooth-picked into a small volume of PCR reaction mix that includes primers that flank the cloning site. This is usually achieved with Universal primers from the vector polylinker (1 ). Following in vitro amplification, aliquots of each reaction are analyzed by agarose gel electrophoresis, which reveals both the presence and size of cloned inserts.
- Submission of Nucleotide Sequence Data to EMBL/GenBank/DDBJ
- Genome-Wide Analysis of DNA Methylation in Low Cell Numbers by Reduced Representation Bisulfite Sequencing
- Detection and Interpretation of Genomic Structural Variation in Mammals
- Assays for Toxicity Studies in C. elegans With Bt Crystal Proteins
- Targeted Gene Disruption in Koji Mold Aspergillus oryzae
- FISH Mapping for Helminth Genome
- Modification of Peptides and Other Drugs Using Lipoamino Acids and Sugars
- In Situ Detection of Apoptosis by the TUNEL Assay: An Overview of Techniques
- Modes of Defining Atherosclerosis in Mouse Models: Relative Merits and Evolving Standards
- Prenatal Diagnosis of Chromosomal Abnormalities Using Maternal Blood