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Direct evidence for sequence-dependent attraction between double-stranded DNA controlled by methylation.

Jejoong Yoo1, Hajin Kim2,3, Aleksei Aksimentiev1,4

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DNA duplexes associate more strongly when AT-rich, with thymine methylation enhancing attraction. This DNA-DNA interaction may influence chromosome organization and gene regulation.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Genetics

Background:

  • Proteins organize DNA in vivo, but theoretical models suggest DNA duplexes can associate directly.
  • Polycations like spermine are known to influence DNA structure and interactions.

Purpose of the Study:

  • To investigate direct DNA-DNA interactions between duplexes in the presence of spermine.
  • To determine the role of DNA sequence composition (AT-rich vs. GC-rich) and methylation in DNA association.

Main Methods:

  • Utilized molecular dynamics simulations.
  • Employed single-molecule fluorescence resonance energy transfer (smFRET) experiments.

Main Results:

  • AT-rich DNA duplexes showed stronger association than GC-rich duplexes, independent of homology.
  • Thymine methylation repositioned spermine, increasing DNA-DNA attraction.
  • Cytosine methylation in GC-rich DNA enhanced attraction to levels comparable to AT-rich DNA.

Conclusions:

  • Direct DNA-DNA interactions, influenced by sequence and methylation, contribute to DNA organization.
  • These findings may explain observed higher contact frequencies in AT-rich and methylated DNA regions.
  • Direct DNA interactions could play a role in chromosome organization and gene regulation.