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High-throughput genotyping of single nucleotide polymorphisms with rolling circle amplification
A F Faruqi1, S Hosono, M D Driscoll
1Molecular Staging Inc, 300 George St, Suite 701, New Haven, CT 06511, USA. fawadf@molecularstaging.com
BMC Genomics
|August 21, 2001
Summary
This study presents a novel, cost-effective method for single nucleotide polymorphism (SNP) genotyping using allele discrimination by ligation and rolling circle amplification. This scalable assay enables high-throughput SNP scoring directly from genomic DNA.
Area of Science:
- Genetics
- Molecular Biology
- Biotechnology
Background:
- Single nucleotide polymorphisms (SNPs) are crucial for complex trait and pharmacogenomic studies.
- Existing SNP databases necessitate simple, robust, and scalable genotyping methods.
- Current methods often require preamplification of target DNA, adding complexity.
Purpose of the Study:
- To develop an inexpensive, simple, robust, and scalable SNP genotyping method.
- To enable high-throughput SNP scoring directly from human genomic DNA.
- To meet the demands of automated genetic analyses.
Main Methods:
- A solution-based, microtiter plate method utilizing allele discrimination by ligation of open circle probes.
- Rolling circle amplification of the signal using fluorescent primers.
- Circularization of probes occurs only when the 3' base is complementary to the SNP.
Main Results:
- Achieved 100,000-fold discrimination against mismatched probes.
- Successfully genotyped 10 SNPs from 192 genomic DNA samples in a high-throughput format.
- Demonstrated genotyping sensitivity using as little as 1 ng of genomic DNA, detecting single molecules of circularized probe.
Conclusions:
- The method is compatible with homogeneous formats, suitable for automation.
- Assaying small amounts of genomic DNA directly simplifies the process.
- Meets requirements for automated, high-throughput SNP scoring in genetic research.