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Microsatellites and associated repetitive elements in the sheep genome

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Abstract

To determine the frequency and clustering of a variety of simple di-and trinucleotide repeats, an Artiodactyl short interspersed element (SINE), an ovine satellite repeat, and a human Alu 1 repeat were used to screen a random selection of cosmids containing inserts of ovine genomic DNA. In total, 197 individual cosmids were digested with EcoRI and the fragments separated on 0.7% agarose gels. Southern blots of these gels were then sequentially probed with (AC)7, (CT)9, and (CAC)6 oligonucleotides, and the repeats described above. The frequency at which (AC)1, (CT)n, and (CAC)n repeats were found in the cosmids indicated that they occurred at average intervals of 65 kb, 367 kb, and 213 kb respectively within the ovine genome. The Artiodactyl SINE was the most common, occurring at an average interval of 20 kb. No human Alu 1 sequences were detected. There was a significant positive association between the (AC)n and the Artiodactyl SINE. This association is quite strong as there was significant clustering of the two repeats both within cosmids and also within the EcoRI fragments of the digested genomic fragments. With the exception of the sheep satellite sequence, which occurs in tandem arrays, none of the other repeats showed significant clustering within the 41-kb (average size) cosmid inserts. The first 25 ovine microsatellites we characterized had an average polymorphic information content (PIC) of 0.65. The different microsatellite types, containing either perfect, imperfect, or compound repeats, had similar average PICs of 0.64, 0.65, and 0.66 respectively. There was a weak regression relationship (R2(adj)%=21.9) between the length of the longest uninterrupted dinucleotide repeat in the largest allele and the PIC of the microsatellite.

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Buchanan, F.C., Littlejohn, R.P., Galloway, S.M. et al. Microsatellites and associated repetitive elements in the sheep genome. Mammalian Genome 4, 258–264 (1993). https://doi.org/10.1007/BF00417432

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