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Exploiting dinucleotide microsatellites conserved among mammalian species
1Department of Meat and Animal Science, University of Wisconsin-Madison 53706, USA.
Summary
Developing genetic markers for comparative mapping is feasible using conserved microsatellite sequences. This study successfully identified cross-species microsatellites in genes, aiding gene mapping projects.
Area of Science:
- Genomics
- Molecular Biology
- Comparative Genomics
Background:
- Dinucleotide microsatellites are valuable for gene mapping.
- Estimates of microsatellite conservation vary widely.
- Developing markers across species requires understanding conservation.
Purpose of the Study:
- To assess the feasibility of developing microsatellite markers within genes.
- To explore microsatellite conservation across distantly related species.
Main Methods:
- Selected eight human genes with microsatellites and homologous sequences in other species.
- Designed heterologous primers from conserved exon sequences.
- Used PCR, Southern blot hybridization, cloning, and sequencing to analyze bovine and porcine DNA.
Main Results:
- Four of sixteen (25%) cross-amplified PCR products contained dinucleotide repetitive sequences.
- Identified microsatellite sequences with repeat unit lengths from 5 to 23.
- Observed microsatellite length polymorphism in two sequences and single-strand conformational polymorphism in one.
Conclusions:
- Exploiting conserved microsatellite sequences is a viable strategy for developing genetic markers.
- This approach supports comparative mapping efforts across species.