High density lipoprotein and coronary heart disease: insights from mutations leading to low high density lipoprotein
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1Center E. Grossi Paoletti, University of Milano, Italy.
Insights
Hypoalphalipoproteinemia, linked to HDL cholesterol, may increase heart disease risk. However, specific apolipoprotein A-I gene mutations might offer protection against atherosclerosis.
Area of Science:
- Lipid metabolism and cardiovascular disease genetics.
Background:
- Hypoalphalipoproteinemia stems from genetic defects in apolipoprotein A-I (ApoA-I) or HDL maturation enzymes.
- Emerging data challenge prior assumptions, indicating heightened coronary heart disease (CHD) risk in affected individuals, irrespective of the specific genetic defect.
Purpose of the Study:
- To investigate the cardiovascular implications of various genetic causes of hypoalphalipoproteinemia.
- To clarify the role of apolipoprotein A-I gene mutations in atherosclerosis risk.
Main Methods:
- Analysis of genetic defects in apolipoprotein A-I and HDL-related enzymes.
- Epidemiological assessment of coronary heart disease risk in hypoalphalipoproteinemia patients.
- Characterization of structural apolipoprotein A-I variants.
Main Results:
- Most hypoalphalipoproteinemia cases are associated with increased CHD risk, independent of the underlying genetic cause.
- Mutations in the apolipoprotein A-I gene resulting in structural variants may not increase, and could potentially decrease, atherosclerosis risk.
Conclusions:
- The cardiovascular risk associated with hypoalphalipoproteinemia is complex and gene-dependent.
- Structural apolipoprotein A-I variants may represent a unique subset with a potentially atheroprotective profile, warranting further investigation.
Abstract:
Hypoalphalipoproteinemia can result from defects in the genes encoding apolipoprotein A-I, the major protein component of HDL, or enzymes that are critical for the formation/maturation of mature HDL. Recent information contradicts earlier findings, suggesting that most of the affected subjects are at increased risk of developing coronary heart disease, independent of the mutated gene. A possible exception is represented by mutations in the apolipoprotein A-I gene leading to structural variants, that might even exert a protective effect against atherosclerosis.