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High-throughput SNP detection by using DNA pooling and denaturing high performance liquid chromatography (DHPLC).
J K Wolford1, D Blunt, C Ballecer
1Clinical Diabetes and Nutrition Section, Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institues of Health, Phoenix, AZ 85016, USA. jwolford@exchange.nih.gov
Human Genetics
|January 5, 2001
Summary
DNA pooling with denaturing high performance liquid chromatography (DHPLC) efficiently detects single nucleotide polymorphisms (SNPs). This method enhances throughput and reduces costs for genetic association studies.
Area of Science:
- Genetics
- Molecular Biology
- Bioinformatics
Background:
- Positional cloning of complex disease genes requires extensive association analysis using single nucleotide polymorphisms (SNPs).
- High cost and effort limit the detection of sufficient SNPs across large genomic regions.
Purpose of the Study:
- To explore DNA pooling combined with denaturing high performance liquid chromatography (DHPLC) for improved SNP detection efficiency and economy.
- To adapt DHPLC for variant detection in pooled DNA samples.
Main Methods:
- Constructed DNA pools from 20 individuals with variant allele frequencies from 0%-50%.
- Utilized temperature-modulated heteroduplex formation/DHPLC and dye-terminator sequencing for mutation detection.
- Evaluated the sensitivity and utility of DHPLC for detecting SNPs in pooled DNA.
Main Results:
- DHPLC consistently detected SNPs at frequencies below 5% (1 variant in 20 alleles).
- Fluorescent sequencing required a minimum allele frequency of 10% for variant detection in the same pools.
- Demonstrated DHPLC's capability to detect low-frequency variants in pooled DNA.
Conclusions:
- DNA pooling for DHPLC analysis significantly increases the throughput efficiency of SNP detection.
- This approach offers a cost-effective strategy for large-scale genetic studies.
- The combined method is valuable for accelerating the identification of disease-associated genetic markers.