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DNA Microarrays02:34

DNA Microarrays

Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...

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Entropy-driven collective interactions in DNA brushes on a biochip.

Dan Bracha1, Eyal Karzbrun, Gabriel Shemer

  • 1Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel.

Proceedings of the National Academy of Sciences of the United States of America
|March 9, 2013
PubMed
Summary

DNA brushes on biochips exhibit conformational changes based on density and ion concentration. At physiological conditions, high DNA density surprisingly does not cause stretching, indicating weak excluded volume interactions.

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Area of Science:

  • Biophysics
  • Materials Science
  • Synthetic Biology

Background:

  • Cell-free gene expression on biochips is influenced by DNA brush density and orientation.
  • Dense DNA brushes create partitioned environments affecting protein interactions.
  • Understanding collective DNA interactions is crucial for synthetic biochip design and cellular environment modeling.

Purpose of the Study:

  • To measure the collective conformational behavior of dense DNA polymer brushes on a biochip.
  • To investigate the influence of DNA density and ionic strength on DNA extension.
  • To elucidate the fundamental interactions governing DNA conformation in crowded environments.

Main Methods:

  • Assembly of dense DNA polymer brushes on a biochip with a density gradient.
  • Direct measurement of collective DNA extension using evanescent fluorescence.
  • Analysis of DNA conformation as a function of density-to-ionic strength ratio.

Main Results:

  • DNA polymer brushes undergo significant conformational changes from random coils to stretched configurations.
  • DNA extension follows a universal function of the density-to-ionic strength ratio with a scaling exponent of 1/3.
  • At physiological ionic strength, DNA density does not induce collective stretching, suggesting weak excluded volume interactions.

Conclusions:

  • DNA extension in brushes is driven by osmotic pressure from trapped ions counteracting entropic elasticity.
  • The study reveals crossovers between different brush regimes (osmotic, salted, mushroom, quasineutral).
  • Weak excluded volume interactions in DNA are implied at physiological ionic strength, despite chain overlap.