Detection of a single base exchange in PCR-amplified DNA fragments using agarose gel electrophoresis containing bisbenzimide-PEG.

摘要

Using polymerase chain reaction fragments of known sequences derived from isolates of two related fungal species (Verticillium albo-atrum and V. dahliae), simple submarine electrophoresis in agarose gels containing a bisbenzimide-PEG conjugate (Hanse Analytik (H.A.)-Yellow) has been shown to be capable of distinguishing DNA fragments 567 bp long which differ by as little as a single base change. However, only changes affecting bisbenzimide binding sites (which consist of at least four consecutive A/T bases) alter mobility; other changes are ineffective. A second ligand (H.A.-Red) with high G/C specificity is suggested which may be as effective in detecting other sequence changes.