Direct single-nucleotide polymorphism genotyping from whole blood without DNA extraction

Area of Science:

• Genetics
• Molecular Biology
• Biotechnology

Background:

• Single-nucleotide polymorphisms (SNPs) are crucial genetic markers associated with diverse phenotypes.
• Traditional SNP genotyping requires DNA extraction, a time-consuming and costly process.
• Efficient SNP genotyping is vital for medical, veterinary, and performance-related genetic studies.

Purpose of the Study:

• To develop and validate a novel, direct SNP genotyping method from whole blood.
• To eliminate the requirement for DNA extraction in SNP analysis.
• To assess the method's simplicity, cost-effectiveness, and versatility for genetic targets.

Main Methods:

• Whole blood samples were diluted and analyzed using real-time polymerase chain reaction (PCR) with hydrolysis probes.
• Optimization involved increasing annealing temperature and PCR cycle number to enhance specificity and sensitivity.
• Genotyping was performed for SNPs in *MSTN* and *LCORL* genes.

Main Results:

• The novel method achieved direct SNP genotyping from whole blood without prior DNA extraction.
• Results demonstrated complete concordance with conventional real-time PCR methods using extracted DNA.
• The technique proved effective for SNPs in *MSTN* and *LCORL*, with potential for other targets like *CDH13* and *MAOA*.

Conclusions:

• A simple, low-cost, and versatile direct SNP genotyping method from whole blood was successfully developed.
• This approach bypasses DNA extraction, streamlining genetic analysis.
• The method shows broad applicability for various genetic targets in research and diagnostics.