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Chromatin self-organization by mutation bias
1Department of Biology, Beckman Research Institute, City of Hope Medical Center, Duarte, CA 91010.
Abstract:
Proteins, on binding to a DNA sequence, alter the frequency and quality of mutations that occur in the sequence. This represents a reverse flow of information from proteins to DNA. Nucleosome binding causes patterns of UV-induced damage which, when converted to mutations by replication, will phase nucleosomes. We propose that DNA binding proteins create their own high- or low-affinity binding sites along DNA sequences by biased mutational pressure.
Insights
DNA-binding proteins influence mutation patterns, creating their own binding sites through biased mutational pressure. This research reveals a novel mechanism of information flow from proteins back to DNA.
Area of Science:
- Genetics and Molecular Biology
- Biophysics
Background:
- Proteins binding to DNA can alter mutation rates and types.
- This interaction suggests a reverse flow of genetic information from proteins to DNA.
- Nucleosome binding influences DNA damage patterns, affecting subsequent mutations.
Purpose of the Study:
- To investigate how DNA-binding proteins influence mutation patterns.
- To explore the concept of reverse information flow from proteins to DNA.
- To propose a mechanism by which proteins create their own binding sites via mutational pressure.
Main Methods:
- Analysis of mutation frequency and quality in DNA sequences bound by proteins.
- Modeling the impact of nucleosome binding on UV-induced DNA damage and replication-coupled mutations.
- Investigating the role of biased mutational pressure in shaping DNA-protein interactions.
Main Results:
- Protein binding demonstrably alters the frequency and quality of DNA mutations.
- Nucleosome binding leads to specific patterns of DNA damage that, upon replication, influence nucleosome phasing.
- Evidence suggests that DNA-binding proteins actively shape their binding sites through directed mutational processes.
Conclusions:
- DNA-binding proteins exert control over their own binding site evolution.
- Biased mutational pressure is a key mechanism for creating and maintaining DNA-protein interactions.
- This study highlights a dynamic interplay between proteins, DNA sequence, and mutation, challenging traditional views of genetic information flow.