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Related Experiment Videos

A sensitive non-isotopic assay specific for HIV-1 associated reverse transcriptase.

T Porstmann1, K Meissner, R Glaser

  • 1Department of Medical Immunology, Medical School (Charité), Humboldt University Berlin, F.R.G.

Journal of Virological Methods
|February 1, 1991
PubMed
Summary

A new non-isotopic assay detects human immunodeficiency virus type 1 (HIV-1) reverse transcriptase (RT) with high sensitivity. This method is 30 times more sensitive than traditional radioassays and easily automated.

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Area of Science:

  • Biochemistry
  • Virology
  • Immunology

Background:

  • Accurate detection of human immunodeficiency virus type 1 (HIV-1) reverse transcriptase (RT) is crucial for diagnostics.
  • Traditional radioisotopic assays for RT detection have limitations in sensitivity and require extensive sample processing.

Purpose of the Study:

  • To develop a sensitive, non-isotopic assay for specific detection of HIV-1 reverse transcriptase (RT).
  • To improve upon the sensitivity and efficiency of existing RT detection methods.

Main Methods:

  • Utilized 5-bromo-2'-deoxyuridine triphosphate (BrdUTP) in the RT reaction instead of tritiated thymidine triphosphate.
  • Employed alkaline hydrolysis to degrade the template primer post-RT reaction.
  • Detected single-stranded poly.(BrdU) using an immunoenzymometric assay with monoclonal anti-BrdU antibodies.

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  • Enhanced specificity by pre-isolating RT from virus lysate using insolubilised monoclonal anti-HIV-1 RT antibodies.

    • Main Results:

    • The non-isotopic assay demonstrated significantly higher sensitivity, approximately 30 times greater than classical radioisotopic assays.
    • A strong correlation (r = 0.96) was observed between the new assay and traditional RT determination methods.
    • The assay showed a tenfold increase in analytical sensitivity due to the removal of RT inhibitors via immunological binding.
    • Eliminated the need for multiple filtration steps to remove non-incorporated nucleotides, simplifying the procedure.

    Conclusions:

    • The developed non-isotopic assay provides a highly sensitive and specific method for detecting HIV-1 RT.
    • This assay offers a significant improvement over radioisotopic methods, with enhanced sensitivity and simplified workflow.
    • The assay's adaptability to microtitre plates facilitates automation, making it suitable for high-throughput screening and diagnostics.