Abstract
Microsatellites or simple sequence repeats (SSRs) constitute a significant portion of genomes and play an important role in gene function and genome organization. The availability of a complete genome sequence for yak (Bos grunniens) has made it possible to carry out genome-wide analysis of microsatellites in this species. We analyzed the abundance and density of perfect SSRs in the yak genome. We found a total of 723,172 SSRs with 1–6 bp nucleotide motifs, indicating that about 0.47 % of the yak whole genome sequence (2.66 Gb) comprises perfect SSRs, the average length of which was 17.34 bp/Mb. The average frequency and density of perfect SSRs was 272.18 loci/Mb and 4719.25 bp/Mb, respectively. The proportion of the six classes of perfect SSRs was not evenly distributed in the yak genome. Mononucleotide repeats (44.04 %) with a total number of 318,435 and a average length of 14.71 bp appeared to be the most abundant SSRs class, while the percentages of dinucleotide, trinucleotide, pentanucleotide, tetranucleotide and hexanucleotide repeats was 24.11 %, 15.80 %, 9.50 %, 6.40 % and 0.15 %, respectively. Different repeat classes of SSRs varied in their repeat number with the highest being 1206. Our results suggest that 15 motifs comprised the predominant categories with a frequency above 1 loci/Mb: A, AC, AT, AG, AGC, AAC, AAT, ACC, ATTT, GTTT, AATG, CTTT, ATGG, AACTG and ATCTG.

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Acknowledgments
The author thank Prof. Michael W. Bruford, Dr. Penny C. Gardner and Dr. David Stanton (Cardiff university, UK) for their assistance in improving English on the manuscript. This study was supported by the National Natural Science Foundation of China (No. 31360267), the 123 high-level personnel training project of Qinghai university, the scientific and technological innovation platform of bovine (milk, meat, wool) industry of Qinghai Province and the Technology Foundation for Selected Overseas Chinese Scholar, Department of Human Resources and Social Security of Qinghai Province.
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Ma, Z. Genome-wide characterization of perfect microsatellites in yak (Bos grunniens). Genetica 143, 515–520 (2015). https://doi.org/10.1007/s10709-015-9849-y
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DOI: https://doi.org/10.1007/s10709-015-9849-y

