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Increasing the information content of STS-based genome maps: identifying polymorphisms in mapped STSs
1Division of Dermatology, Washington University School of Medicine, St. Louis, Missouri 63110, USA. kwok@visar.wustl.edu
Genomics
|January 1, 1996
Summary
Scanning sequence-tagged sites (STSs) for DNA sequence polymorphisms enhances human genome mapping. This approach identifies new variations and improves map accuracy with minimal effort.
Area of Science:
- Genomics
- Human Genetics
- Molecular Biology
Background:
- Physical maps of the human genome are crucial for genetic research.
- Sequence-tagged sites (STSs) are fundamental to constructing these maps.
- Thousands of STSs representing unique DNA sequences have been generated.
Purpose of the Study:
- To investigate the potential of identifying DNA sequence polymorphisms within existing STSs.
- To increase the information content of STS-based genome maps.
- To refine and correct errors in initial STS sequences.
Main Methods:
- Screening 154 published STSs from the Whitehead Institute/MIT Genome Center.
- Analyzing 37.2 kb of unique DNA sequence for variations.
- Employing a sequence-based approach to estimate allele frequencies of identified polymorphisms.
Main Results:
- Identification of 47 new DNA sequence polymorphisms within the analyzed STSs.
- Discovery of a high frequency of substitution polymorphisms (1 in 1.3 kb).
- 29 polymorphisms exhibited heterozygosities exceeding 32%.
Conclusions:
- Scanning STSs for DNA polymorphisms is an efficient method to augment genome maps.
- This strategy adds significant value to existing mapping efforts with minimal extra work.
- The process aids in resolving ambiguities and correcting errors in STS sequences.