Polymorphism, monomorphism, and sequences in conserved microsatellites in primate species

Area of Science:

• Genetics
• Genomics
• Evolutionary Biology

Background:

• Dimeric short tandem repeats (microsatellites) are highly polymorphic genetic markers in mammalian genomes.
• These hypervariable loci are crucial for linkage analysis, individual identification, and interspecies studies.

Purpose of the Study:

• To analyze the variability and sequences of a human microsatellite-containing segment in various primate species.
• To assess the conservation and evolutionary dynamics of these microsatellite loci across primate lineages.

Main Methods:

• Utilized heterologous human primers to amplify and sequence a genomic region containing three microsatellites in chimpanzee, orangutan, gibbon, and macaque.
• Analyzed sequence data for base substitutions, insertions, deletions, and repeat number variations.

Main Results:

• Human microsatellite primers successfully amplified homologous regions in all studied primate species, indicating conserved sequences.
• Significant intraspecific and interspecific variability was observed in the intervening sequences and microsatellite repeat numbers.
• Variations such as single base substitutions and low repeat numbers were associated with reduced polymorphism and monomorphism in certain species.

Conclusions:

• Conserved microsatellite sequences across primate superfamilies (Hominoidea and Cercopithecidea) are valuable for comparative genomics.
• Microsatellite variability, influenced by repeat number and specific sequence variations, provides insights into mutation rates and evolutionary relationships.
• These microsatellite markers are informative for comparing closely related species and reconstructing primate phylogeny.