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Updated: Apr 20, 2026
Author Spotlight: Efficient Nucleosome Reconstitution for Single-Molecule Techniques
Published on: September 6, 2024
Role of DNA sequence in chromatin remodeling and the formation of nucleosome-free regions
Yahli Lorch1, Barbara Maier-Davis1, Roger D Kornberg1
1Department of Structural Biology, Stanford University School of Medicine, Stanford, California 94305, USA.
Abstract:
AT-rich DNA is concentrated in the nucleosome-free regions (NFRs) associated with transcription start sites of most genes. We tested the hypothesis that AT-rich DNA engenders NFR formation by virtue of its rigidity and consequent exclusion of nucleosomes. We found that the AT-rich sequences present in many NFRs have little effect on the stability of nucleosomes. Rather, these sequences facilitate the removal of nucleosomes by the RSC chromatin remodeling complex. RSC activity is stimulated by AT-rich sequences in nucleosomes and inhibited by competition with AT-rich DNA. RSC may remove NFR nucleosomes without effect on adjacent ORF nucleosomes. Our findings suggest that many NFRs are formed and maintained by an active mechanism involving the ATP-dependent removal of nucleosomes rather than a passive mechanism due to the intrinsic instability of nucleosomes on AT-rich DNA sequences.
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