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Gene conversion drives GC content evolution in mammalian histones.
1CNRS UMR 5000-Génome, Populations, Interactions, Université Montpellier 2-CC63, Place E. Bataillon, 34095, Montpellier, France. galtier@univ-montp2.fr
Trends in Genetics : TIG
|January 28, 2003
Summary
Gene conversion, a DNA repair process, appears to increase GC content in genes. This finding suggests gene conversion influences DNA base composition and vertebrate evolution.
Area of Science:
- Evolutionary biology
- Molecular genetics
- Genomics
Background:
- Gene conversion is a mechanism of genetic recombination that can alter DNA sequences.
- DNA base composition, particularly GC content, varies across genomes and can impact various biological processes.
- Understanding factors influencing DNA base composition is crucial for evolutionary studies.
Purpose of the Study:
- To investigate the evolutionary impact of gene conversion on DNA base composition.
- To determine if gene conversion biases DNA base composition, specifically GC content.
Main Methods:
- Analysis of an extensive dataset of histone paralogous genes from human and mouse.
- Comparison of GC content between gene copies within highly similar subfamilies (presumed gene conversion) and unique gene copies (presumed no gene conversion).
Main Results:
- Gene copies belonging to subfamilies with very similar sequences exhibit higher GC content.
- Unique gene copies show lower GC content compared to those in similar subfamilies.
Conclusions:
- Gene conversion appears to be a biased process that favors an increase in DNA GC content.
- This bias has significant implications for the evolution of isochores in vertebrates.