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Detection of DNA sequence polymorphisms by enzymatic amplification and direct genomic sequencing
1Department of Ophthalmology, Harvard Medical School, Boston, MA.
American Journal of Human Genetics
|October 1, 1989
Summary
Direct sequencing rapidly detects DNA sequence variations, identifying new genetic markers. This method proved effective for the retinoblastoma locus, finding informative markers where restriction fragment length polymorphisms (RFLPs) failed.
Area of Science:
- Human Molecular Genetics
- Genomics
- Cancer Genetics
Background:
- Restriction fragment length polymorphisms (RFLPs) are valuable genetic markers but detect only a fraction of DNA sequence variations.
- Many polymorphisms are missed by RFLP screening, representing a lost opportunity for genetic marker discovery.
Purpose of the Study:
- To develop and validate a rapid method for detecting DNA sequence variations using enzymatic amplification and direct sequencing.
- To identify novel, informative genetic markers for the human retinoblastoma susceptibility locus.
Main Methods:
- Genomic DNA from nine individuals was amplified and directly sequenced.
- Screening focused on identifying DNA sequence polymorphisms within a specific region.
Main Results:
- Four DNA sequence polymorphisms were identified within the screened region of the retinoblastoma locus.
- These newly identified polymorphisms were informative in three hereditary retinoblastoma families, unlike existing RFLPs.
Conclusions:
- Direct sequencing is a feasible and effective alternative to RFLP analysis for discovering DNA sequence polymorphisms.
- This approach enhances the identification of informative genetic markers, particularly at previously under-characterized genetic loci.