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Related Experiment Videos

Rapid assays for quantitating cytokine gene expression without target amplification.

Frank R Gonzales1, Augusto Lois, Toddy Sewell

  • 1Chromagen, Inc., San Diego, California 92121, USA. fgonzales@chromagen.com

Combinatorial Chemistry & High Throughput Screening
|May 29, 2003
PubMed
Summary

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High Performance Signal Amplification (HPSA) assays offer a rapid, cost-effective method for measuring gene expression. This technique quantifies mRNA levels directly from cell lysates, improving drug discovery screening.

Area of Science:

  • Biotechnology
  • Molecular Biology
  • Immunology

Background:

  • Drug discovery often targets gene expression of cytokines in inflammation, allergy, and immunity.
  • Existing gene expression methods (Northern blot, RT-PCR) are inefficient for high-throughput screening.

Purpose of the Study:

  • To introduce and validate the High Performance Signal Amplification (HPSA) gene expression assay.
  • To demonstrate HPSA as a rapid, convenient alternative for monitoring cytokine mRNA levels.

Main Methods:

  • HPSA assays quantify mRNA targets directly from cell lysates using DNA probe hybridization and fluorescent signal amplification.
  • Assays utilize 96 or 384-well microplate formats for manual or automated processing.
  • mRNA levels are quantified relative to in vitro RNA calibrators, achieving low attomole sensitivity.

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Main Results:

  • HPSA assays successfully monitored mRNA transcription of TNF-alpha, IL-1beta, and Interferon-gamma in human cell lines and PBMCs.
  • The method demonstrated high specificity, precision, and reproducibility.
  • Assay sensitivity reached the low attomole range.

Conclusions:

  • HPSA gene expression assays provide a rapid, convenient, and reliable screening system.
  • This method overcomes limitations of traditional laborious and time-consuming gene expression analysis techniques.