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Non-traditional Alu evolution and primate genomic diversity
Astrid M Roy-Engel1, Marion L Carroll, Mohamed El-Sawy
1Department of Environmental Health Sciences, Tulane Cancer Center SL-66, Tulane University Medical Center, 1430 Tulane Ave., New Orleans, LA 70112, USA.
Journal of Molecular Biology
|March 9, 2002
Summary
Most "young" Alu elements, expected only in humans, were found in primates due to gene conversion or parallel insertions. This suggests unique evolutionary events shaped primate genomes.
Area of Science:
- Genomics
- Evolutionary Biology
- Molecular Biology
Background:
- Alu elements are repetitive DNA sequences in primate genomes.
- Young Alu subfamilies are presumed to have inserted after human-primate divergence.
- Their presence in non-human primates challenges existing evolutionary models.
Purpose of the Study:
- To investigate the presence of "young" Alu elements in non-human primate genomes.
- To understand the mechanisms behind "young" Alu insertions in orthologous positions.
- To assess the impact of Alu element evolution on primate genome diversity.
Main Methods:
- Polymerase chain reaction (PCR) screening of over 500 Alu insertion loci.
- Sequence analysis of identified Alu elements and their genomic locations.
- Comparative genomics across primate species, including owl monkeys.
Main Results:
- Several "young" Alu elements were identified at orthologous positions in non-human primate genomes.
- These insertions resulted from gene conversion of ancient Alu elements or parallel insertions.
- Owl monkey genomes showed a higher rate of multiple, independent Alu insertions in small regions.
- Gene conversion between Alu elements significantly influences single nucleotide diversity.
Conclusions:
- The presence of "young" Alu elements in non-human primates is explained by recombination and parallel insertion mechanisms.
- Alu element evolution, particularly gene conversion, plays a crucial role in shaping primate genome diversity.
- The findings suggest that most Alu insertions in primate genomes are unique evolutionary events, not solely human-specific.