Partial LPL deletions: rare copy-number variants contributing towards severe hypertriglyceridemia

Area of Science:

• Genetics
• Molecular Biology
• Cardiovascular Medicine

Background:

• Severe hypertriglyceridemia (HTG) is a prevalent dyslipidemia with significant health risks.
• Genetic factors, including copy-number variants (CNVs), contribute to HTG pathophysiology.
• Next-generation sequencing aids in identifying genetic causes of severe HTG.

Purpose of the Study:

• To investigate the role of CNVs in the genetic etiology of severe HTG.
• To identify novel genetic variants associated with severe hypertriglyceridemia.
• To assess the diagnostic utility of CNV detection in HTG patients.

Main Methods:

• Screening of targeted sequencing data from 632 severe HTG patients.
• Identification and confirmation of LPL gene deletions using Sanger sequencing.
• Analysis of copy-number variants (CNVs) in individuals with severe hypertriglyceridemia.

Main Results:

• Four patients (0.63%) with severe HTG were found to have partial LPL gene deletions.
• Identified deletions spanned from the 5' untranslated region (UTR) to exons 1 or 2 of the LPL gene.
• All identified LPL deletions were heterozygous and associated with multifactorial severe HTG.

Conclusions:

• Novel CNVs in the LPL gene are associated with severe hypertriglyceridemia.
• These LPL deletions may lead to higher triglyceride levels and more severe phenotypes.
• CNV detection should be integrated into the diagnostic workup for patients with severe HTG.