Fluorescence energy transfer detection as a homogeneous DNA diagnostic method

Xiangning Chen^a , Barbara Zehnbauer^b, Andreas Gnirke^c, and Pui-Yan Kwok^{a §}

^a Division of Dermatology and ^b Department of Pediatrics, Washington University School of Medicine, 660 South Euclid Avenue, Box 8123;St. Louis, MO 63110; and ^c Mercator Genetics, 4040 Campbell Avenue, Menlo Park, CA 94025

Communicated by Maynard V. Olson, University of Washington, Seattle, WA, August 7, 1997 (received for review June 18, 1997)

ABSTRACT

A homogeneous DNA diagnostic assay based on template-directed primer extension detected by fluorescence resonance energy transfer, named template-directed dye-terminator incorporation (TDI) assay, has been developed for mutation detection and high throughput genome analysis. Here, we report the successful application of the TDI assay to detect mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene, the human leukocyte antigen H (HLA-H) gene, and the receptor tyrosin kinase (RET) protooncogene that are associated with cystic fibrosis, hemochromatosis, and multiple endocrine neoplasia, type 2, respectively. Starting with total human DNA, the samples are amplified by the PCR followed by enzymatic degradation of excess primers and deoxyribonucleoside triphosphates before the primer extension reaction is performed. All these standardized steps are performed in the same tube, and the fluorescence changes are monitored in real time, making it a useful clinical DNA diagnostic method.

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Last revised: January 13, 2004.