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Mutation pattern variation among regions of the primate genome
D Casane1, S Boissinot, B H Chang
1Human Genetics Center, University of Texas Health Science Center, P. O. Box 20334, Houston, TX 77225, USA.
Journal of Molecular Evolution
|September 26, 1997
Summary
Pseudogenes, non-functional gene copies, show varied mutation rates influenced by their genomic location. These findings reveal factors affecting mutation rates and sequence evolution in primates.
Area of Science:
- Genomics
- Evolutionary Biology
- Molecular Genetics
Background:
- Argininosuccinate synthetase pseudogenes (PsiAS) offer insights into genome evolution.
- Understanding mutation rate variations is crucial for evolutionary studies.
Purpose of the Study:
- To sequence and analyze three argininosuccinate-synthetase-processed pseudogenes and their flanking regions in primates.
- To investigate regional variations in mutation rates and their impact on pseudogene evolution.
Main Methods:
- Sequencing of pseudogenes (PsiAS-A1, PsiAS-A3, PsiAS-3) and flanking DNA in human, orangutan, baboon, and colobus.
- Analysis of mutation rates (G/C to A/T and A/T to G/C) and GC content.
Main Results:
- Pseudogenes integrated into Old World monkey genomes post-lineage divergence.
- Variable mutation rates (u/v ratios) observed in pseudogene flanking regions.
- Pseudogenes exhibit higher mutation rates ('hot spots') compared to flanking regions ('cold regions').
Conclusions:
- Genomic position and sequence characteristics influence spontaneous mutation rates.
- Pseudogene evolution is impacted by regional mutation rate variations and a 'sequence effect'.