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DNA structural patterns and nucleosome positioning

H Staffelbach1, T Koller, C Burks

  • 1Theoretical Biology and Biophysics Group, Los Alamos National Laboratory, NM 87545.

Journal of Biomolecular Structure & Dynamics
|October 1, 1994
PubMed
Summary
This summary is machine-generated.

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Nucleosome positioning is not solely determined by DNA sequence. While isolated nucleosome cores show sequence-dependent positioning, most mapped nucleosomes in complex chromatin suggest other factors are involved.

Area of Science:

  • Molecular Biology
  • Genomics
  • Chromatin Structure

Background:

  • Nucleosome positioning is crucial for DNA accessibility and gene regulation.
  • Mechanisms for nucleosome positioning are not fully understood, with proposed roles for local DNA sequence signals and non-local boundary effects.

Purpose of the Study:

  • To systematically search for local DNA sequence signals that determine nucleosome positioning.
  • To investigate whether sequence patterns can explain the positioning of mapped nucleosome cores in chromatin.

Main Methods:

  • Analysis of DNA sequences from 113 mapped nucleosome cores (in vivo, in situ, or reconstituted chromatin).
  • Focus on periodic distribution of sequence elements based on six DNA structural models and all mono-, di-, and trinucleotides.
  • Comparative analysis with isolated chicken nucleosome cores, known for sequence-dependent positioning.

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Main Results:

  • Isolated chicken nucleosome core sequences exhibit distinct features compared to random DNA, confirming sequence-dependent positioning and algorithm efficacy.
  • Mapped nucleosome core sequences, on average, resemble random DNA, indicating sequence patterns are not the primary determinant for most positions.
  • The positioning of most mapped nucleosomes is likely influenced by a dynamic interplay of factors beyond local DNA sequence.

Conclusions:

  • Local DNA sequence patterns are not the dominant factor for positioning the majority of nucleosomes in chromatin.
  • Nucleosome arrangement results from a complex interplay of DNA-octamer interactions, nucleosome-nucleosome interactions, and other positioning signals.
  • Further research is needed to elucidate the combined mechanisms governing in vivo nucleosome positioning.