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Human DNA is almost two meters long. However, it is compressed inside a tiny nucleus measuring only a few microns in diameter. To make this degree of compaction possible, DNA is organized into several sequential levels so that it can fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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Hyperplectonemes: A Higher Order Compact and Dynamic DNA Self-Organization.

Aleksandre Japaridze1, Georgi Muskhelishvili2,3, Fabrizio Benedetti4,5

  • 1Laboratory of Physics of Living Matter, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland.

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|February 14, 2017
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Summary

Researchers discovered a new DNA structure called hyperplectonemes in bacteria. This organization is crucial for DNA accessibility and genetic regulation, influenced by DNA supercoiling and bacterial physiology.

Keywords:
DNAFISH-NSHUnucleoid associated proteinsplectonemesself-organizationsupercoiling

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Genetics

Background:

  • Bacterial chromosome structure is dynamic, adapting to growth conditions.
  • Understanding DNA accessibility to proteins is key for genetic regulation.
  • DNA topology significantly influences genetic processes.

Purpose of the Study:

  • To investigate the organization of very large supercoiled double-stranded DNA (dsDNA).
  • To identify novel DNA structures and their formation mechanisms.
  • To understand the role of DNA topology and associated proteins in bacterial genetic regulation.

Main Methods:

  • High-resolution characterization of dsDNA.
  • Theoretical modeling and simulations.
  • Molecular dynamics calculations.

Main Results:

  • Discovery of a new, highly ordered DNA organization termed 'hyperplectonemes'.
  • Hyperplectoneme formation is dependent on DNA size, supercoiling, and bacterial physiology.
  • Negative supercoiling dictates DNA molecular dynamics and 3D shape, even when bound by nucleoid-associated proteins (FIS, H-NS, HU).

Conclusions:

  • Hyperplectonemes represent a novel mode of bacterial DNA organization.
  • DNA topology, specifically supercoiling, is a critical determinant of DNA structure and dynamics.
  • Findings provide mechanistic insights into DNA topology's role in genetic regulation.