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Related Experiment Video

Updated: May 11, 2026

High-throughput Flow-cytometry Measurement of Cellular Mechanotype Based on Rupture and Delivery of DNA Tension Probes into Cells
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High-throughput Flow-cytometry Measurement of Cellular Mechanotype Based on Rupture and Delivery of DNA Tension Probes into Cells

Published on: June 13, 2025

Rapid internal contraction boosts DNA friction.

Oliver Otto1, Sebastian Sturm, Nadanai Laohakunakorn

  • 1Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UK.

Nature Communications
|May 9, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces dynamic force spectroscopy to measure DNA tension dynamics. It reveals enhanced viscous friction in DNA strands upon release, aiding molecular interaction studies.

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Molecular Biology

Background:

  • Single-molecule force spectroscopy manipulates macromolecules with light and monitors with force.
  • This technique is crucial for understanding DNA mechanics, molecular interactions, and protein folding.

Purpose of the Study:

  • To develop a dynamic force spectroscopy setup for non-invasive inspection of tension dynamics in DNA.
  • To investigate the viscous friction and relaxation dynamics in taut DNA strands.

Main Methods:

  • Introduction of a dynamic force spectroscopy setup.
  • Monitoring the relaxation of an attached colloidal tracer after sudden release of a DNA molecule.
  • Quantitative theoretical analysis of the observed phenomena.

Main Results:

  • Demonstrated enhanced viscous friction in DNA strands after sudden release.
  • Observed slow relaxation of an attached colloidal tracer, indicating significant viscous drag.
  • Developed a systematic theory that quantitatively explains the experimental data.

Conclusions:

  • Dynamic force spectroscopy offers a powerful tool for studying DNA tension dynamics.
  • The findings provide insights into the viscoelastic properties of DNA at the nanoscale.
  • This technique can aid in the rational design of new biophysical assays.