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Clinical Chemistry 38: 873-879, 1992;
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Clinical Chemistry, Vol 38, 873-879, Copyright © 1992 by American Association for Clinical Chemistry

Improved electrochemiluminescent label for DNA probe assays: rapid quantitative assays of HIV-1 polymerase chain reaction products

JH Kenten, S Gudibande, J Link, JJ Willey, B Curfman, EO Major and RJ Massey
IGEN Inc., Rockville, MD 20852.

We describe the characterization and utility of a new electrochemiluminescent (ECL) label for oligonucleotides, utilizing phosphoramidite chemistry. This phosphoramidite of the tris(2,2- bipyridine)ruthenium(II) complex, bis(2,2-bipyridine)(4-[4-(2- cyanoethoxy-N,N-diisopropyl-amino) phosphinoxybutyl]4'-methyl)2,2- bipyridine ruthenium(II) dihexafluorophosphate or Origen phosphoramidite, enables the direct incorporation of the label during automated DNA synthesis. Efficiency of this automated synthesis allows the direct utilization of probes without further purification. Introduction of this labeling group is reproducible, and the ECL signal recovered is not influenced by hybridization. Furthermore, neither hybridization kinetics nor hybrid stability was affected by our label. We also demonstrate the utility of these labels for the development of rapid assays with oligonucleotides direct from automated synthesis. The clinical utility of these labeled oligonucleotides is shown with assays of total nucleic acid, extracted from peripheral blood lymphocytes of patients with acquired immunodeficiency syndrome (AIDS), to detect the human immunodeficiency virus (HIV-1). The results demonstrate the ability of the assay to quantify 30-2000 copies of HIV1 gag genes and to rapidly detect (less than 45 min) HIV-1 gag genes in a nonseparation assay. The application of this assay to clinical samples demonstrates the utility of these assays for rapid and quantitative analysis.


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Copyright © 1992 by the American Association for Clinical Chemistry.