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Targeted genetic testing for familial hypercholesterolaemia using next generation sequencing: a population-based

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Next-generation sequencing (NGS) effectively identifies Familial Hypercholesterolaemia (FH) mutations in primary care patients with high cholesterol. This genetic testing approach offers a scalable solution for diagnosing FH, a condition often missed in routine healthcare.

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Area of Science:

  • Genetics
  • Cardiovascular Disease
  • Molecular Diagnostics

Background:

  • Familial Hypercholesterolaemia (FH) is a common genetic disorder leading to premature heart disease, with a high percentage of cases undiagnosed.
  • Current diagnostic methods are insufficient for identifying FH in primary care, where most patients receive healthcare.
  • Next-generation sequencing (NGS) has shown promise for FH mutation detection in specialized settings.

Purpose of the Study:

  • To evaluate the targeted use of NGS for diagnosing FH in a primary care population subset.
  • To assess the feasibility of identifying FH index cases within primary care settings.

Main Methods:

  • Utilized microfluidics-based PCR amplification, NGS, and MLPA to detect mutations in LDLR, APOB, and PCSK9 genes.
  • Analyzed three phenotypic groups: hypercholesterolaemic, on cholesterol-lowering therapy, and normocholesterolaemic controls from the Generation Scotland study.
  • Included 193 hypercholesterolaemic, 232 on therapy, and 192 control individuals.

Main Results:

  • Pathogenic mutations were identified in 2.1% of hypercholesterolaemic individuals and 2.2% of those on cholesterol-lowering therapy.
  • A significant 42% of available first-degree relatives of identified cases carried pathogenic mutations.
  • Variants of uncertain clinical significance (VUCS) were found in 1.4% of the tested hypercholesterolaemic and treated groups; no pathogenic variants or VUCS were detected in controls.

Conclusions:

  • Population-based genetic testing using NGS protocols can definitively diagnose FH in individuals with high cholesterol or on lipid-lowering therapy.
  • NGS-based testing presents a potentially lower-cost and less labor-intensive alternative to conventional sequencing for FH detection.
  • This approach could significantly increase the rate of genetic diagnoses for FH, addressing the current diagnostic gap.