Rad51 Polymerization and Chromatin Remodeling
Author Information
Author(s): Dupaigne Pauline, Lavelle Christophe, Justome Anthony, Lafosse Sophie, Mirambeau Gilles, Lipinski Marc, Piétrement Olivier, Le Cam Eric
Primary Institution: CNRS, Laboratoire de Microscopie Moléculaire et Cellulaire, UMR 8126 Interactions Moléculaires et Cancer, Institut de cancérologie Gustave Roussy, Villejuif, France
Hypothesis
Rad51 polymerization on double-stranded DNA influences chromatin accessibility to recombination machinery.
Conclusion
Rad51 polymerization induces significant chromatin remodeling by evicting nucleosomes along the DNA.
Supporting Evidence
- Rad51 preferentially binds single-stranded DNA over double-stranded DNA.
- Rad51 polymerization leads to nucleosome eviction on chromatinized templates.
- The remodeling effect of Rad51 polymerization was observed at various concentrations.
- RecA also displays remodeling activity, but it is less efficient than Rad51.
Takeaway
Rad51 is like a tiny machine that can push aside blocks (nucleosomes) on a string (DNA) to help fix broken parts.
Methodology
The study used biochemical approaches, transmission electron microscopy (TEM), and atomic force microscopy (AFM) to analyze Rad51's effects on chromatin.
Limitations
The exact mechanism of how nucleosomes are ejected during Rad51 polymerization remains unclear.
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website