Cost-effective and scalable DNA extraction method from dried blood spots

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Dried blood spot (DBS) analysis is crucial for newborn screening (NBS) to enable early detection and presymptomatic treatment of congenital diseases.
• Advancements in molecular genetics necessitate the development of reliable, cost-effective, and high-throughput DNA extraction methods for NBS programs.
• Existing methods require optimization for scalability and efficiency in molecular testing applications.

Purpose of the Study:

• To develop and validate a flexible, cost-efficient, and high-throughput DNA extraction method from DBS samples.
• To adapt the method for both small- and large-scale screening settings within NBS programs.
• To ensure the extracted DNA is of high quality for subsequent molecular genetic analyses.

Main Methods:

• Genomic DNA (g.DNA) was extracted from 3-mm DBS using sequential lysis and buffer solutions.
• Standard PCR amplification was performed on extracted g.DNA, with detection via agarose gel, melting-curve analysis, and TaqMan assays.
• Amplicon verification was achieved through BigDye® Terminator cycle sequencing and comparison with reference sequences.

Main Results:

• High-quality, amplifiable g.DNA was successfully extracted from hundreds of DBS samples.
• Mutation detection in multiple human genes was confirmed across various analytical platforms.
• Both manual and automated extraction protocols were validated, showing normal g.DNA distribution correlating with white blood cell counts.

Conclusions:

• High-quality, amplifiable genomic DNA can be reliably extracted from DBS samples using the developed method.
• The method is adaptable, scalable, and cost-effective (approximately $0.10/sample) for both low- and high-throughput NBS.
• This DNA extraction technique is currently implemented for routine molecular testing in the New York State NBS program.