A newborn screening pilot study using methylation-sensitive high resolution melting on dried blood spots to detect...

Area of Science:

• Genetics
• Molecular Biology
• Clinical Diagnostics

Background:

• Prader-Willi (PWS) and Angelman (AS) syndromes are distinct imprinting disorders affecting chromosome 15q11-q13.
• Early diagnosis is crucial for effective treatment and genetic counseling.
• Whole blood (WB) is a common DNA source, but its use for mass newborn screening is limited by economic and technical factors.

Purpose of the Study:

• To adapt Methylation-sensitive High-Resolution Melting (MS-HRM) for genetic screening of PWS and AS using dried blood spot (DBS) samples.
• To evaluate different DNA isolation techniques from DBS for diagnostic performance.
• To compare DBS-based MS-HRM with traditional WB methods.

Main Methods:

• Collected 125 DBS cards over one year, with 45 pre-diagnosed samples (20 PWS, 1 AS, 24 healthy).
• Tested three different DBS DNA extraction methods, assessing DNA concentration and quality.
• Performed MS-HRM analysis and statistical comparison of the methods.

Main Results:

• All tested DBS DNA extraction methods accurately detected individuals with PWS and AS.
• The efficiency of detecting healthy individuals varied among the extraction methodologies.
• MS-HRM analysis of DBS-extracted DNA proved effective for imprinting disorder detection.

Conclusions:

• DNA extracted from DBS and analyzed by MS-HRM is an accurate method for genetic screening of imprinting disorders like PWS and AS in newborns.
• This approach offers significant advantages over traditional whole blood methods for large-scale newborn screening.
• The study validates DBS-based MS-HRM as a viable and beneficial diagnostic tool.