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Related Experiment Videos

Two-dimensional fluorescence difference gel electrophoresis for comparative proteomics profiling.

Nilesh S Tannu1, Scott E Hemby

  • 1Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157, USA.

Nature Protocols
|May 10, 2007
PubMed
Summary
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Multiplexing fluorescent two-dimensional difference gel electrophoresis (2D-DIGE) enhances quantitative proteomics by enabling simultaneous analysis of multiple samples. This method improves accuracy and reproducibility in measuring protein expression changes.

Area of Science:

  • Proteomics
  • Biochemistry
  • Molecular Biology

Background:

  • Quantitative proteomics is crucial for understanding protein expression in normal and disease states.
  • Gel-based and MuDPIT methods have advanced protein expression analysis.
  • Two-dimensional gel electrophoresis (2DGE) is a key technique in proteomics.

Purpose of the Study:

  • To introduce multiplexing fluorescent two-dimensional difference gel electrophoresis (2D-DIGE) as a methodological advance.
  • To highlight the benefits of 2D-DIGE for quantitative proteomics.

Main Methods:

  • 2D-DIGE utilizes direct labeling of lysine groups on proteins with cyanine CyDye DIGE Fluor minimal dyes.
  • Multiple samples (2-3) are labeled with different dyes and run on the same 2D gel.

Related Experiment Videos

  • Isoelectric focusing precedes electrophoresis of labeled samples.

    • Main Results:

    • 2D-DIGE minimizes spot pattern variability and reduces the number of gels required.
    • The technique offers simple, accurate, and reproducible spot matching.
    • The protocol duration ranges from 3-5 weeks based on sample size and expertise.

    Conclusions:

    • 2D-DIGE represents a significant methodological improvement for quantitative proteomics.
    • This technique enhances the efficiency and reliability of protein expression analysis.
    • 2D-DIGE facilitates more robust comparisons of protein alterations across different conditions.