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Microsatellites and associated repetitive elements in the sheep genome
F C Buchanan1, R P Littlejohn, S M Galloway
1Department of Biochemistry, University of Otago, Dunedin, New Zealand.
Summary
Researchers investigated simple DNA repeats in sheep genomes, finding Artiodactyl SINEs are most common and associate with (AC)n repeats. These findings aid in understanding genome structure and developing genetic markers.
Area of Science:
- Genomics
- Molecular Biology
- Bioinformatics
Background:
- Simple sequence repeats (SSRs) are crucial for genome structure and function.
- Understanding repeat distribution and association is key to genomic research.
Purpose of the Study:
- To determine the frequency and clustering of simple di- and trinucleotide repeats in the ovine genome.
- To investigate associations between different types of repetitive elements.
Main Methods:
- Screening of 197 ovine genomic DNA cosmids using Southern blot hybridization.
- Probing with specific oligonucleotides ((AC)n, (CT)n, (CAC)n) and known repeat sequences (Artiodactyl SINE, ovine satellite, human Alu 1).
Main Results:
- Artiodactyl SINEs were the most frequent repeat, with an average interval of 20 kb.
- Significant positive association and clustering were observed between (AC)n repeats and Artiodactyl SINEs.
- Ovine microsatellites exhibited high average polymorphic information content (PIC) of 0.65.
Conclusions:
- Repetitive elements like SINEs and microsatellites are unevenly distributed in the ovine genome.
- The strong association between (AC)n and Artiodactyl SINEs suggests functional or evolutionary links.
- Characterized ovine microsatellites are valuable for genetic studies and marker development.