Quantitative determination of allele frequency in pooled DNA by using sequencing method

Area of Science:

• Genetics
• Molecular Biology
• Bioinformatics

Background:

• Determining single-nucleotide polymorphism (SNP) allele frequencies in pooled DNA is crucial for understanding SNP-disease relationships.
• Existing methods may lack accuracy, cost-effectiveness, or scalability for large-scale genetic studies.

Purpose of the Study:

• To develop and validate a simple, accurate, and inexpensive method for quantitative allele frequency determination in pooled DNA samples.
• To address challenges in allele frequency measurement, particularly the differential response of alleles.

Main Methods:

• The assay involves three key steps: DNA pooling, polymerase chain reaction (PCR) amplification, and sequencing.
• A correction method based on heterozygous fluorescence intensities was developed to account for differential allele responses.

Main Results:

• The method demonstrated high accuracy, with a correlation coefficient (r²) of 0.997 between measured and known allele frequencies.
• The assay reliably quantified allele frequencies in pooled DNA samples ranging from 7.1% to 53.9%.

Conclusions:

• This method offers a powerful strategy for simultaneous, inexpensive, and reproducible SNP genotyping of numerous samples.
• It facilitates the detection of significant polymorphic differences in candidate gene association studies, advancing genetic research.