Low-Cost High-Throughput Genotyping for Diagnosing Familial Hypercholesterolemia

Area of Science:

• Genetics
• Cardiovascular Disease
• Molecular Diagnostics

Background:

• Familial hypercholesterolemia (FH) is a prevalent genetic disorder leading to high LDL cholesterol and early cardiovascular disease.
• Current genetic diagnostic methods for FH are often costly and time-intensive.
• Underdiagnosis of FH remains a significant public health concern.

Purpose of the Study:

• To evaluate the diagnostic accuracy of a novel, low-cost, high-throughput genotyping array for familial hypercholesterolemia (FH).
• To assess the array's potential to improve accessibility and reduce costs associated with FH genetic testing.

Main Methods:

• Customization of an Illumina Global Screening Array with probes for 636 known FH-causing variants.
• Theoretical coverage assessment in 1772 FH variant carriers diagnosed via next-generation sequencing.
• Validation of array performance in 1268 FH variant carriers from a Dutch cascade screening program.

Main Results:

• The array demonstrated a theoretical coverage of 91.3% for FH-causing variants.
• Overall sensitivity in validation reached 94.7%, increasing to 98.2% for variants included in the array design.
• Copy number variation analysis showed 89.4% sensitivity, with a 1.3% false-positive rate for newly identified variants.

Conclusions:

• The FH genotyping array presents a cost-effective and accurate tool for genetic diagnosis of familial hypercholesterolemia.
• This technology has the potential to significantly enhance the accessibility of genetic testing for FH.
• Ongoing array customization is expected to further refine its diagnostic performance.