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Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...
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Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles
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Self-Assembled Micro-Sized Hexagons Built from Short DNA in a Crowded Environment.

Tetsunao Makino1, Daisuke Nakane1, Makiko Tanaka1

  • 1Department of Engineering Science Graduate School of Informatics and Engineering, The University of Electro-Communications 1-5-1 Chofugaoka, Chofu, Tokyo, 182-8585, Japan.

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|October 6, 2022
PubMed
Summary
This summary is machine-generated.

Researchers created micro-sized hexagonal DNA structures using a single DNA pair. These DNA hexagons, formed through controlled heating and cooling, show potential for biomedical applications.

Keywords:
DNAbiophysicsliquid crystalsself-assemblysupramolecular chemistry

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Area of Science:

  • Materials Science
  • Biotechnology
  • Nanotechnology

Background:

  • DNA nanotechnology enables the creation of programmable structures with diverse applications.
  • Self-assembly of DNA is a key strategy for developing novel materials and devices.

Purpose of the Study:

  • To investigate the formation of micro-sized hexagonal DNA assemblies.
  • To understand the role of DNA sequence and assembly conditions in creating specific structures.

Main Methods:

  • Utilized short double-stranded DNA with complementary two-base overhangs.
  • Employed controlled heating and cooling procedures in a buffer-salt poly(ethylene glycol) solution.
  • Analyzed structures using circular dichroism spectroscopy and polarization microscopy.

Main Results:

  • Successfully formed stable, micro-sized hexagonal structures from a single DNA pair.
  • Demonstrated that end-to-end adhesion via complementary overhangs is crucial for hexagonal assembly.
  • Identified optimal heating temperatures and concentrations of DNA and poly(ethylene glycol) for stable formation.
  • Observed parallel alignment of double-stranded DNA within the hexagonal platelets.

Conclusions:

  • Simple DNA building blocks can self-assemble into complex hexagonal microstructures.
  • The formation of these DNA hexagons is sensitive to thermal conditions and solution concentrations.
  • These self-assembled DNA hexagons hold promise for future biomedical device development.