Base excision sequence scanning (BESS) is a new polymerase chain reaction (PCR)-based mutation scanning method that locates and identifies all DNA mutations. The BESS method consists of two procedures that generate "T" (BESS T-Scan) and "G" ladders (BESS G-Tracker) analogous to T and G ladders of dideoxy sequencing. The BESS procedures are simple to perform and require no special equipment or gels, no reaction optimization beyond PCR, and no heteroduplex formation. The samples are analyzed on standard sequencing gels or on automated DNA sequencers, and the data produced are easy to interpret, requiring a simple comparison of the sequence of normal and mutant DNA. The BESS method is versatile, having applications not only for mutation detection, but also single nucleotide polymorphism (SNP) discovery and analysis, DNA fingerprinting (including viral and bacterial typing), and clone identification. In this study, we utilize BESS in two of these applications: detection of a point mutation in BRCA1, and DNA typing of human papilloma virus (HPV).
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