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Related Concept Videos

The DNA Helix01:16

The DNA Helix

Overview
The DNA Helix01:16

The DNA Helix

Overview
DNA as a Genetic Template02:05

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...
DNA-only Transposons02:57

DNA-only Transposons

DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
The donor site from where the transposon is excised is either degraded or...
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...
The DNA Helix01:07

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Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...

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Related Experiment Video

Updated: Jul 19, 2026

Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles
10:23

Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles

Published on: May 8, 2015

Brownian motion of DNA confined within a two-dimensional array.

Dmytro Nykypanchuk1, Helmut H Strey, David A Hoagland

  • 1Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst, MA 01003, USA.

Science (New York, N.Y.)
|August 10, 2002
PubMed
Summary

DNA molecules exhibit unique Brownian motion in confined spaces, localizing in cavities and jumping through holes, which follows Poisson statistics. This discovery offers new insights into macromolecular diffusion and separation technologies.

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Related Experiment Videos

Last Updated: Jul 19, 2026

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A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA
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Area of Science:

  • Biophysics
  • Materials Science
  • Physical Chemistry

Background:

  • Brownian motion of linear DNA molecules is crucial for understanding transport phenomena.
  • Existing models of macromolecular diffusion, such as reptation and sieving, may not fully capture behavior in complex environments.

Purpose of the Study:

  • To visualize and analyze the diffusion of linear DNA molecules within media featuring molecular-sized spatial constraints.
  • To elucidate the mechanisms governing DNA diffusion in patterned cavities and interconnecting holes.

Main Methods:

  • Utilized colloidal templating to create a 2D array of spherical cavities interconnected by circular holes.
  • Observed and quantified the Brownian motion and diffusion of linear DNA molecules of various sizes within this patterned medium.

Main Results:

  • DNA molecules showed strong localization within cavities due to their flexibility, deviating from reptation or sieving models.
  • Inter-cavity transport occurred via sporadic "jumps" through the holes, closely following Poisson statistics.
  • The holes acted as molecular weight-dependent entropic barriers, reducing DNA's configurational freedom.

Conclusions:

  • Sterically constrained macromolecular diffusion, characterized by cavity localization and hole-jumping, is a key mechanism in patterned media.
  • This diffusion mechanism has significant implications for separation technologies and biological transport processes.
  • The findings provide a new perspective on DNA dynamics in confined environments.