APOE gene variants in primary dyslipidemia

Area of Science:

• Genetics and Molecular Biology
• Cardiovascular Medicine
• Metabolic Disorders

Background:

• Apolipoprotein E (apoE) plays a crucial role in lipoprotein metabolism, with different isoforms affecting lipid levels and cardiovascular risk.
• The apoE4 isoform is linked to increased LDL-cholesterol and higher cardiovascular risk, while apoE2 is associated with decreased LDL-cholesterol but can cause familial dysbetalipoproteinemia.
• Rare APOE gene variants have been identified in various dyslipidemias, including familial dyslipidemias, familial combined hyperlipidemia, lipoprotein glomerulopathy, and autosomal dominant hypercholesterolemia (ADH).

Purpose of the Study:

• To review APOE variants and their molecular and clinical overlaps with different dyslipidemias.
• To discuss the emerging role of APOE as a candidate gene for autosomal dominant hypercholesterolemia (ADH).
• To emphasize the need for further studies to clarify the spectrum of APOE's involvement in dyslipidemias for improved diagnosis and management.

Main Methods:

• Literature review and synthesis of existing research on Apolipoprotein E (apoE) variants and dyslipidemias.
• Analysis of reported cases and genetic studies linking APOE variants to specific lipid disorders.
• Comparative analysis of clinical presentations and molecular mechanisms.

Main Results:

• The APOE gene, particularly the p.Leu167del variant, is identified as a causative factor in some cases of autosomal dominant hypercholesterolemia (ADH).
• Clinical presentations of lipid disorders associated with APOE variants often overlap due to interacting factors like genetics, environment, and epigenetics.
• Existing data suggests a broader implication of APOE in dyslipidemias than previously recognized.

Conclusions:

• APOE is a significant factor in lipoprotein metabolism and cardiovascular risk, with specific variants linked to various dyslipidemias.
• The identification of APOE variants in ADH broadens the genetic landscape of this condition.
• Further research is essential to fully elucidate the role of APOE in dyslipidemias for enhanced clinical practice.