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Hypobetalipoproteinemia: genetics, biochemistry, and clinical spectrum

Patrizia Tarugi1, Maurizio Averna

  • 1Department of Biomedical Sciences, University of Modena and Reggio Emilia, Modena, Italy. tarugi@unimore.it

Advances in Clinical Chemistry
|August 31, 2011
PubMed

Insights

Hypobetalipoproteinemias (HBL) are genetic disorders causing low cholesterol and apoB. This review covers their biochemistry, genetics, and clinical spectrum, offering a diagnostic approach.

Area of Science:

  • Biochemistry
  • Genetics
  • Clinical Medicine

Background:

  • Hypobetalipoproteinemias (HBL) are characterized by low plasma levels of total cholesterol, LDL-cholesterol, and apolipoprotein B.
  • HBL can be primary (monogenic, due to gene mutations) or secondary (nongenetic factors).
  • Familial hypobetalipoproteinemia (FHBL) is the most common monogenic form, often with dominant inheritance.

Purpose of the Study:

  • To review the biochemistry, genetics, and clinical spectrum of Hypobetalipoproteinemias.
  • To provide a diagnostic algorithm for clinical and laboratory assessment of HBL.

Main Methods:

  • Literature review of primary and secondary Hypobetalipoproteinemias.
  • Analysis of genetic causes including mutations in APOB, PCSK9, MTP, and SARA2 genes.
  • Discussion of clinical phenotypes ranging from mild fatty liver to severe malabsorption.

Main Results:

  • Primary HBL include FHBL (dominant), abetalipoproteinemia (ABL), and chylomicron retention disease (CMRD) (recessive).
  • Heterozygous FHBL typically presents with mild symptoms like fatty liver.
  • Homozygous FHBL, ABL, and CMRD manifest severe intestinal malabsorption and vitamin deficiencies.

Conclusions:

  • HBL encompass a diverse group of lipid metabolism disorders with varying genetic origins and clinical severity.
  • Understanding the genetic basis and clinical presentation is crucial for accurate diagnosis and management.
  • A structured diagnostic algorithm aids in differentiating and managing HBL effectively.

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