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Related Concept Videos

Two-dimensional Gel Electrophoresis01:22

Two-dimensional Gel Electrophoresis

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Two-dimensional gel electrophoresis is a high-resolution protein separation method first introduced by O' Farrell and Klose in 1975. This method involves protein separation by two dimensions, mass and charge, making it more accurate than one-dimensional gel electrophoresis.
The first dimension separation uses the isoelectric focusing or IEF technique performed on immobilized pH gradient (IPG) strips that separate proteins according to their isoelectric points.
Biological samples, such...
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Gel electrophoresis is a method that separates biological macromolecules like nucleic acids or proteins by forcing them to pass through a gel matrix under an electric field.
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Proteomics01:33

Proteomics

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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.
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Ribosome Profiling02:24

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Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
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Related Experiment Video

Updated: Mar 28, 2026

Consensus Brain-derived Protein, Extraction Protocol for the Study of Human and Murine Brain Proteome Using Both 2D-DIGE and Mini 2DE Immunoblotting
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Deceptive responsive genes in gel-based proteomics.

Sara Hamzelou1, Hossein Askari1, Nona Abolfathi Nobari2

  • 1Biotechnology department, Faculty of New Technologies and Energy Engineering, Shahid Beheshti University, G.C. Evin, Tehran, Iran.

Computational Biology and Chemistry
|December 27, 2015
PubMed
Summary
This summary is machine-generated.

Two-dimensional gel electrophoresis (2DE) can inaccurately represent gene expression changes. Adding new proteins can create misleading profiles, questioning 2DE

Keywords:
Mathematical equationProteomicsTwo-dimensional electrophoresis (2DE)

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Area of Science:

  • Proteomics
  • Gene Expression Analysis
  • Biotechnology

Background:

  • Quantitative analysis of gene expression at the protein level typically uses two-dimensional gel electrophoresis (2DE) coupled with mass spectrometry.
  • Ensuring the analytical and biological accuracy of 2DE-based proteomics datasets is a significant challenge.

Purpose of the Study:

  • To mathematically and empirically simulate how technical regulations, specifically the addition of new proteins, affect gene expression analysis using 2DE.
  • To assess the reliability of 2DE for analyzing proteomes with extensive alterations.

Main Methods:

  • Developed a mathematical equation to predict changes in protein spot quantities in response to added proteins.
  • Empirically tested the equation's predictions by introducing varying amounts of a new protein into samples.
  • Analyzed 2DE results using prevalent data analysis tools.

Main Results:

  • The developed equation predicted detectable alterations in protein spot quantities.
  • Empirical data showed that introducing a new protein could lead to deceptive expression profiles.
  • Observed differential protein amounts, contradicting theoretical predictions of overall reduction, when varying quantities of the new protein were added.

Conclusions:

  • Two-dimensional gel electrophoresis (2DE) may not be a reliable method for analyzing biological samples with significant proteome changes, such as during cell development or differentiation.
  • Depletion of highly abundant proteins is recommended before employing 2DE for such complex samples to improve accuracy.