Use Stratagenes single-tube allelic discrimination assays to realize several advantages over existing mutation detection techniques: The hairpin-shaped molecular beacon probes are more specific in distinguishing single base-pair mismatches than linear probes.2 Because the test is performed in a closed tube and no post-PCR manipulation of samples is required, the test saves time and effort and significantly reduces the risk of PCR product carry-over contamination. Being able to use two allele-specific molecular beacons in the same PCR solution enables three possible genotype representations (two homozygotes and a heterozygote) of two allelic variants in target DNA to be determined at the same time. It also definitively discriminates a true negative result from a false negative result due to PCR failure. Finally, the technology can be adapted for high-throughput assays. Currently, with the 96-well PCR plate, it takes about 4 hours to completely screen 96 DNA samples; further enhancement of the assay throughput can be achieved by using a higher density plate format (e.g., 384-well format).
The authors thank the following: Dr. P.N. Ray (Molecular Diagnostic
Laboratory, the Hospital for Sick Children, Toronto, Canada) for providing the
CF genotype-specific human genomic DNA; Dr. J.W. Longshore (Molecular Diagnostic
Laboratory, Greenwood Genetic Center, Greenwood, SC) and Dr. V.M. Pratt (LabCorp,
Research Triangle Park, NC) for providing the factor II genotype-specific human
genomic DNA; Dr. J.W. Longshore (Molecular Diagnostic Laboratory, Greenwood
Genetic Center, Greenwood, SC) and Dr. C. Mura (Laboratoi