Nucleic Acids Research, Vol 25, Issue 15 3102-3109, Copyright © 1997 by Oxford University Press
E Fahy, R Nazarbaghi, M Zomorrodi, C Herrnstadt, WD Parker, RE Davis and SS Ghosh
A sensitive and highly reproducible multiplexed primer extension assay is
described for quantitative mutation analysis of heterogeneous DNA
populations. Wild-type and mutant target DNA are simultaneously probed in
competitive primer extension reactions using fluorophor-labeled primers and
high fidelity, thermostable DNA polymerases in the presence of defined
mixtures of deoxy- and dideoxynucleotides. Primers are differentially
extended and the resulting products are distinguished by size and dye
label. Wild-type:mutant DNA ratios are determined from the fluorescence
intensities associated with electrophoretically resolved reaction products.
Multiple nucleotide sites can be simultaneously interrogated with uniquely
labeled primers of different lengths. The application of this quantitative
technique is shown in the analysis of heteroplasmic point mutations in
mitochondrial DNA that are associated with Alzheimer's disease.
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Multiplex fluorescence-based primer extension method for quantitative mutation analysis of mitochondrial DNA and its diagnostic application for Alzheimer's disease
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