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Related Concept Videos

Maxam-Gilbert Sequencing01:05

Maxam-Gilbert Sequencing

In the same year as the discovery of the Sanger sequencing method, another group of scientists, Allan Maxam and Walter Gilbert, demonstrated their chemical-cleavage method for DNA sequencing. The Maxam-Gilbert method relies on using different chemicals that can cleave the DNA sequence at specific sites, the separation of resulting DNA fragments of variable size using electrophoresis, and deciphering the DNA sequence from the resulting gel bands.
Challenges of the Maxam-Gilbert Method
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Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles
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Magnesium-free self-assembly of multi-layer DNA objects.

Thomas G Martin1, Hendrik Dietz

  • 1Physik Department, Walter Schottky Institute, Technische Universität München, Am Coulombwall 4a, 85748 Garching near Munich, Germany.

Nature Communications
|October 4, 2012
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Summary

DNA nanotechnology can now assemble nanoscale objects using only monovalent ions, removing the need for magnesium. This advance broadens the applicability of DNA self-assembly for creating nanodevices in diverse environments.

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Area of Science:

  • Nanotechnology
  • Molecular Biology
  • Biochemistry

Background:

  • DNA self-assembly enables the creation of user-defined nanoscale objects.
  • Previous methods often required magnesium ions, limiting practical applications.
  • The necessity of divalent cations like magnesium for DNA assembly was widely assumed.

Purpose of the Study:

  • To investigate conditions for DNA object assembly using monovalent ions.
  • To demonstrate that magnesium is not essential for templated multi-layer DNA object assembly.
  • To identify factors influencing successful DNA nanostructure folding.

Main Methods:

  • Assembling templated multi-layer DNA objects in solutions containing monovalent ions.
  • Analyzing the correlation between non-thermally stable DNA strands and sodium ion requirements.
  • Employing rational design to minimize weakly binding DNA strands.

Main Results:

  • Successful assembly of DNA objects was achieved using only monovalent ions.
  • Neither magnesium nor other divalent cations are essential for this type of DNA assembly.
  • Reducing the proportion of weakly binding DNA strands improved folding yield.

Conclusions:

  • DNA-based nanodevices can be assembled without magnesium or other divalent cations.
  • Monovalent ion conditions expand the utility of DNA nanotechnology.
  • Rational design of DNA strands is key to optimizing nanodevice assembly and yield.