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Genome-wide mining of perfect microsatellites and tetranucleotide orthologous microsatellites estimates in six primate species.
Gene 2018 Februrary 16
Advancement in genome sequencing and in silico mining tools have provided new opportunities for comparative primate genomics of microsatellites. The SSRs (simple sequence repeats) numbers were not correlated with the genome size (Pearson, r=0.310, p=0.550), and were positively correlated with the total length of SSRs (Pearson, r=0.992, p=0.00). A total of 224,289 tetranucleotide orthologous microsatellites families and 367 single-copy orthologous SSRs loci were found in six primate species by homologous alignment. The inner mutation types of single-copy orthologous SSRs loci included the copy number variance, point mutation, and chromosomal translocation. The accumulated repeat times and average length of tetranucleotide orthologous microsatellites in Rhinopithecus roxellana, Papio anubis and Macaca mulatta were longer than Homo sapiens and Pan troglodytes, which showed the tetranucleotide orthologous SSRs loci had more repeat times and longer average length on the branches with earlier divergence time, one exception may be Microcebus murinus as a primitive monkey with a smallest morphology in Malagasy. Our conclusion indicated that single-copy tetranucleotide orthologous SSRs sequences accumulated individual mutation more slowly through time in H. sapiens and P. troglodytes than in R. roxellanae, P. anubis and M. mulatta. However, such divergence wouldn't arise uniformly in all branches of the primate tree. A comparison of genomic sequence assemblages would offer remarkable insights about comparisons and contrasts, and the evolutionary processes of the microsatellites involved in human and nonhuman primate species.
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