[Molecular genetics of hypercholesterolemia]

Area of Science:

• Genetics
• Molecular Biology
• Cardiovascular Disease

Background:

• Familial hypercholesterolemia (FH) is an inherited lipid metabolism disorder.
• It leads to severely elevated blood cholesterol levels.
• FH significantly increases the risk of premature coronary heart disease.

Purpose of the Study:

• To review the molecular underpinnings of familial hypercholesterolemia.
• To elucidate the genetic defects responsible for FH.
• To highlight the prevalence of different genetic mutations in FH.

Main Methods:

• Literature review of genetic defects in familial hypercholesterolemia.
• Analysis of mutation frequencies in key genes.
• Focus on LDL receptor, apolipoprotein B-100, PCSK9, and LDLRAP1 genes.

Main Results:

• Mutations in the LDL receptor (LDLR) gene account for 85-90% of FH cases.
• Defects in apolipoprotein B-100 (APOB) gene cause 5-10% of FH.
• Less than 5% of FH cases involve gain-of-function mutations in PCSK9, and rare cases are due to LDLRAP1 mutations.

Conclusions:

• FH is primarily caused by mutations affecting LDL receptor function.
• Genetic variations in APOB, PCSK9, and LDLRAP1 contribute to FH pathogenesis.
• Understanding these molecular bases is crucial for FH diagnosis and management.