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DNA as a Genetic Template

DNA as a Genetic Template

Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...

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Related Experiment Video

Updated: Aug 20, 2025

Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers

Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers

Published on: October 13, 2011

Modeling multiple duplex DNA attachments in a force-extension experiment.

Allan Raudsepp¹, Martin A K Williams^1,2, Geoffrey B Jameson^1,2

¹School of Fundamental Sciences, Massey University, Palmerston North, New Zealand.

Biophysical Reports

|November 25, 2022

Summary

This summary is machine-generated.

Optical tweezers experiments with DNA stretching can yield complex results at high DNA concentrations. This study explains these complex force-extension curves by analyzing multiple DNA attachments between beads.

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Last Updated: Aug 20, 2025

Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers

Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers

Published on: October 13, 2011

Single-molecule Manipulation of G-quadruplexes by Magnetic Tweezers

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Published on: September 19, 2017

Combining Single-molecule Manipulation and Imaging for the Study of Protein-DNA Interactions

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Published on: August 27, 2014

Area of Science:

Biophysics
Molecular Biology
Nanotechnology

Background:

Optical tweezers are used to stretch single DNA molecules tethered between beads.
DNA concentration affects tethering success and measurement complexity.
Complex force-extension curves in high DNA concentrations are often attributed to multiple tethers.

Purpose of the Study:

To critically examine the hypothesis that multiple DNA attachments cause complex force-extension curves.
To understand the potential usefulness of data from multiple DNA attachments.
To analyze and simulate DNA stretching at higher concentrations.

Main Methods:

Utilizing optical tweezers for DNA stretching experiments.
Performing measurements at higher DNA concentrations.
Employing analysis and simulation techniques to interpret force-extension data.

Main Results:

Demonstrated that complex force-extension curves arise from multiple DNA attachments.
Provided a framework for understanding and analyzing data from multiple tethers.
Showcased the potential utility of data generated from multiple DNA attachments.

Conclusions:

Multiple DNA attachments provide a valid explanation for complex force-extension curves in optical tweezers experiments.
The study validates a common hypothesis and offers new insights into interpreting complex biophysical data.
This work enhances the understanding of DNA mechanics and optical tweezers methodologies.