Research Article abstract
Nature Biotechnology 15, 331 - 335 (1997)
doi:10.1038/nbt0497-331
Enhanced discrimination of single nucleotide polymorphisms by artificial mismatch hybridization
Zhen Guo1, Qinghua Liu1 & Lloyd M. Smith1, *
Abstract
In order to increase the discrimination of single nucleotide polymorphisms in DNA hybridization, artificial mismatches are inserted into probe oligonucleotides using the base analog 3-nitropyrrole. Differences in thermal stability (
Tm) between hybrids formed with normal and single-nucleotide-variant DNA targets are increased by as much as 200% over conventional hybridization, and are strongly dependent upon the spacing between mismatches. The increased specificity is demonstrated by hybridization analysis and allele-specific amplification within the HLA-DRB locus.
- 1Department of Chemistry, University of Wisconsin-Madison, Madison, WI 53706.
- *Corresponding author (e-mail: smith@chem.wisc.edu).


