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Related Experiment Videos

Apolipoprotein B gene mutations affecting cholesterol levels.

R V Farese1, M F Linton, S G Young

  • 1Gladstone Foundation Laboratories for Cardiovascular Disease, Department of Medicine, University of California, San Francisco.

Journal of Internal Medicine
|June 11, 1992
PubMed
Summary
This summary is machine-generated.

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Mutations in the apolipoprotein B (apoB) gene cause familial hypobetalipoproteinaemia, leading to low LDL cholesterol. A specific mutation, familial defective apolipoprotein B (FDB), results in high cholesterol due to impaired LDL receptor binding.

Area of Science:

  • Genetics and Molecular Biology
  • Cardiovascular Science
  • Metabolic Disorders

Background:

  • Apolipoprotein B (apoB) gene mutations significantly impact plasma cholesterol levels.
  • Over 20 apoB gene mutations cause familial hypobetalipoproteinaemia, characterized by low apoB and LDL cholesterol.
  • Most mutations lead to truncated apoB protein, affecting LDL metabolism.

Purpose of the Study:

  • To review mutations in the apolipoprotein B gene affecting plasma cholesterol.
  • To describe familial hypobetalipoproteinaemia and familial defective apolipoprotein B (FDB).
  • To highlight the clinical and genetic aspects of apoB gene mutations.

Main Methods:

  • Literature review of apoB gene mutations and their effects on cholesterol.
  • Analysis of clinical phenotypes associated with familial hypobetalipoproteinaemia and FDB.

Related Experiment Videos

  • Description of molecular mechanisms, including impaired LDL receptor binding.

    • Main Results:

    • Familial hypobetalipoproteinaemia heterozygotes have significantly reduced LDL cholesterol and are usually asymptomatic.
    • Homozygotes for familial hypobetalipoproteinaemia exhibit extremely low LDL cholesterol with variable clinical presentations.
    • Familial defective apolipoprotein B (FDB), caused by an Arg3500Gln substitution, impairs LDL clearance and causes hypercholesterolaemia, affecting up to 1 in 500 individuals in some populations.

    Conclusions:

    • ApoB gene mutations are a significant cause of dyslipidaemia, leading to both hypobetalipoproteinaemia and hypercholesterolaemia.
    • Understanding these mutations is crucial for diagnosing and managing cholesterol-related disorders.
    • The FDB mutation highlights the critical role of apoB in LDL receptor interaction and cholesterol homeostasis.