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Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers
Published on: October 13, 2011
Coarse-grained simulations of stretching entangled DNA using oscillating electric fields
Richard S Graham1, Ronald G Larson
1School of Mathematical Sciences, University of Nottingham, Nottingham NG7 2RD, UK. Richard.Graham@nottingham.ac.uk
Chemical Communications (Cambridge, England)
|September 11, 2010
Summary
Oscillating electric fields cause DNA stretching around hairpin loops in entangling media, a key factor in DNA sequencing. This mechanism explains experimental observations, including resonance with field frequency.
Area of Science:
- Biophysics
- Molecular Biology
- Computational Biology
Background:
- DNA stretching is crucial for techniques like DNA sequencing.
- Understanding the physical mechanisms of DNA manipulation in complex media is essential.
Purpose of the Study:
- To investigate the mechanism of DNA stretching in entangling media under oscillating electric fields.
- To explain experimental observations related to DNA stretching dynamics.
Main Methods:
- Utilizing Brownian dynamics simulations.
- Modeling interactions between DNA, entangling media, and oscillating electric fields.
Main Results:
- DNA stretching is proposed to occur around hairpin loops at the chain ends.
- This mechanism is driven by interactions with the surrounding medium.
- Simulations successfully explain several experimental findings, including resonance phenomena.
Conclusions:
- The proposed hairpin loop interaction mechanism provides a valid explanation for DNA stretching under oscillating electric fields.
- This research contributes to the understanding of DNA manipulation for sequencing applications.
