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Short tandem repeat polymorphic markers for the rat genome from marker-selected libraries
R Y Walder1, M R Garrett, A M McClain
1Department of Internal Medicine, University of Iowa, Iowa City, Iowa 52242, USA.
Summary
Researchers developed novel polymorphic markers for rat genomes using enriched libraries. This strategy successfully generated 147 markers, aiding in mapping disease genes and complex traits in rats.
Area of Science:
- Genomics
- Molecular Biology
- Animal Genetics
Background:
- Developing high-quality polymorphic markers is crucial for genetic mapping in model organisms like the rat.
- Previous marker-selection methods have proven effective, particularly for the human genome.
Purpose of the Study:
- To generate a genome-wide set of high-quality polymorphic markers for the rat.
- To facilitate the mapping of disease genes and identification of loci associated with complex mammalian phenotypes in rats.
Main Methods:
- Construction of small-insert rat genomic libraries enriched for short tandem repeat sequences (STRs).
- Sequencing of STR-containing clones, primarily (GATA)n repeats.
- Synthesis of PCR primers for (CA)n and (GATA)n STRs and testing for polymorphism in eight inbred rat strains.
- Linkage analysis in three F2 populations to map the developed markers.
Main Results:
- Enriched libraries showed a 50-fold increase in STRs, with 45% (CA)n and 27% (GATA)n repeats.
- Sequencing of 2160 STR-containing clones.
- Successful development of 147 polymorphic markers from (CA)n and (GATA)n STRs.
- High-confidence mapping of these markers to all rat chromosomes.
Conclusions:
- The marker-selection method is effective for generating polymorphic STR markers in the rat.
- The 147 novel polymorphic markers provide valuable tools for rat genetic research.
- These markers will enhance gene mapping for diseases and complex traits in mammalian models.