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Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method
Published on: May 2, 2025
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Stepwise histone modifications are mediated by multiple enzymes that rapidly associate with nascent DNA during
Svetlana Petruk1, Kathryn L Black, Sina K Kovermann
1Department of Biochemistry and Molecular Biology and Kimmel Cancer Center, Thomas Jefferson University, 1020 Locust Street, Philadelphia, Pennsylvania 19107, USA.
Nature Communications
|November 27, 2013
Summary
Chromosomal proteins reassemble on DNA during replication. Most chromatin modifiers associate with replication machinery, while remodelers dissociate and rebind later, ensuring epigenetic inheritance.
Area of Science:
- Molecular Biology
- Epigenetics
- Chromatin Biology
Background:
- Epigenetic inheritance relies on DNA replication and protein reassembly.
- The precise behavior of chromosomal proteins during replication remains unclear.
Purpose of the Study:
- To investigate the dynamics of chromosomal proteins during DNA replication.
- To understand the mechanisms of epigenetic inheritance at the molecular level.
Main Methods:
- Utilized novel methods to assess protein assembly during DNA replication.
- Examined the proximity of various chromosomal proteins to PCNA and nascent DNA.
Main Results:
- Most chromatin-modifying enzymes (methylases, demethylases, acetyltransferases, deacetylase) associate with PCNA or nascent DNA.
- Histone modifications occur temporally after DNA replication, orchestrated by enzyme complexes.
- Nucleosome-remodeling complex components dissociate from parental DNA and are recruited to nascent DNA post-replication.
Conclusions:
- Epigenetic inheritance involves specific protein behaviors around the replication fork.
- Chromatin modifiers remain close to replication machinery, while remodelers re-associate later.
- This ordered reassembly ensures the faithful inheritance of gene expression patterns.
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