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Aptamer-Based Target Detection Facilitated by a 3-Stage G-Quadruplex Isothermal Exponential Amplification Reaction
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Detection methodology based on target molecule-induced sequence-specific binding to a single-stranded

Agnieszka Lass-Napiorkowska1, Ewa Heyduk, Ling Tian

  • 1Edward A. Doisy Department of Biochemistry and Molecular Biology, St. Louis University Medical School, 1100 S. Grand Blvd., St. Louis, Missouri 63104, USA.

Analytical Chemistry
|March 10, 2012
PubMed
Summary
This summary is machine-generated.

We developed a new assay using antigen peptide-oligonucleotide conjugates for detecting antibodies, proteins, and bacteria. This method simplifies solid-surface assay preparation and enables multiplexed profiling for disease diagnostics.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Assay Development

Background:

  • Previous homogeneous assays utilized antibody-induced oligonucleotide annealing for detection.
  • Solid-surface assays often require complex surface chemistry for immobilization.

Purpose of the Study:

  • To develop and validate an alternative mix-and-read assay format for detecting various targets.
  • To create a versatile platform for solid-surface based assays with simplified preparation and multiplexing capabilities.

Main Methods:

  • Utilized antigen peptide-oligonucleotide conjugates that bind to a capture oligonucleotide upon target antibody interaction.
  • Immobilized capture oligonucleotides on solid surfaces to create sandwich assays.
  • Demonstrated detection of antibodies, proteins, and pathogenic bacteria using oligonucleotide-labeled antibodies.

Main Results:

  • The new assay format demonstrated high sequence-specific binding affinity between the complex and the capture oligonucleotide.
  • Simplified preparation of solid-surface assays through oligonucleotide-oligonucleotide interactions.
  • Successfully detected various biological targets, including proteins and bacteria.

Conclusions:

  • The proposed assay offers a simplified and versatile approach for solid-surface based detection.
  • The design facilitates microarray-style multiplexing for applications like antibody profiling in disease diagnosis.
  • This platform is adaptable for detecting a wide range of analytes beyond antibodies.