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Large-scale variation among human and great ape genomes determined by array comparative genomic hybridization
Devin P Locke1, Richard Segraves, Lucia Carbone
1Department of Genetics, Case Western Reserve University School of Medicine and University Hospitals of Cleveland, Cleveland, Ohio 44106, USA.
Genome Research
|March 6, 2003
Summary
Large-scale genomic rearrangements drive evolution. Our study reveals significant DNA copy-number variations between human and great ape genomes, primarily in euchromatic regions, suggesting a duplication-driven evolutionary mechanism.
Area of Science:
- Evolutionary biology
- Genomics
- Comparative genomics
Background:
- Large-scale genomic rearrangements are crucial for evolutionary change.
- Understanding human and great ape genome differences is key to human evolution.
Purpose of the Study:
- To analyze DNA copy-number variations between human and great ape genomes.
- To identify the locations and characteristics of these genomic rearrangements.
Main Methods:
- Utilized array comparative genomic hybridization (array CGH).
- Analyzed an array of 2460 human bacterial artificial chromosomes (BACs).
- Performed detailed molecular characterization of identified variant sites.
Main Results:
- Identified 63 sites of DNA copy-number variation between humans and great apes.
- Confirmed rearrangements of 40-175 kb, predominantly in interstitial euchromatin.
- Found a 14-fold positional bias for variant sites in human segmental duplication regions.
Conclusions:
- Genomic rearrangements occur extensively in euchromatic regions, not just near chromosome ends or centers.
- Duplication-driven mechanisms significantly contribute to genome evolution in hominoids.
- These findings refine our understanding of human and great ape genetic divergence.