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Related Concept Videos

Proteomics01:33

Proteomics

A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term proteomics...

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Snap Chip for Cross-reactivity-free and Spotter-free Multiplexed Sandwich Immunoassays
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Antibody colocalization microarray: a scalable technology for multiplex protein analysis in complex samples.

M Pla-Roca1, R F Leulmi, S Tourekhanova

  • 1Biomedical Engineering Department, McGill University, Montreal, Quebec, Canada.

Molecular & Cellular Proteomics : MCP
|December 16, 2011
PubMed
Summary
This summary is machine-generated.

Antibody colocalization microarrays (ACMs) overcome cross-reactivity issues, enabling scalable multiplex protein detection. This novel assay is sensitive, robust, and validated for biomarker discovery in breast cancer patient serum.

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Area of Science:

  • Biotechnology
  • Assay Development
  • Proteomics

Background:

  • Multiplex sandwich assays face limitations in scalability due to cross-reactivity.
  • Existing antibody microarrays are restricted to a few tens of targets.
  • Cross-reactivity in multiplex assays increases quadratically with the number of targets, hindering scale-up.

Purpose of the Study:

  • Introduce "vulnerability" as a metric for assay cross-reactivity.
  • Propose and validate a novel multiplexing technique: antibody colocalization microarray (ACM).
  • Assess the scalability, sensitivity, and robustness of ACMs for biomarker discovery.

Main Methods:

  • Developed "vulnerability" metric to quantify cross-reactivity in multiplex assays.
  • Designed and fabricated antibody colocalization microarrays (ACMs) by physically colocalizing capture and detection antibodies.
  • Validated ACMs against ELISA and conventional multiplex sandwich assays (MSAs).

Main Results:

  • Demonstrated that scaling multiplex sandwich assays is unfeasible due to quadratic increase in cross-reactivity.
  • Successfully produced ACMs with up to 50 targets, showing individual protein binding curves.
  • Validated ACMs for sensitive and robust quantification of proteins in breast cancer patient serum.

Conclusions:

  • ACMs offer a scalable solution for multiplex protein detection by eliminating antibody mixing.
  • ACMs are sensitive, robust, and suitable for biomarker discovery, as evidenced by identifying six candidate biomarkers.
  • The ACM technology represents a significant advancement over traditional multiplex antibody assays.