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Bassen-Kornzweig syndrome

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Abetalipoproteinaemia is a disorder in the synthesis of serum lipoproteins containing apolipoprotein B, for example chylomicrons, VLDL and LDL.

  • a rare autosomal recessive metabolic disorder
    • characterized by extremely low levels of plasma cholesterol and triglycerides and almost complete absence of lipoproteins in the density ranges of chylomicrons, VLDL and LDL
  • plasma lipids are carried almost entirely in the high density lipoproteins class
  • patients suffer from fat malabsorption
    • may present with failure to thrive in early childhood
      • in later childhood patients develop a progressive, ataxic neuropathy and retinopathy, attributed in part to deficiency of fat soluble vitamins, specifically vitamins E and A
  • combined high dose vitamin E and vitamin A therapy does confer protection against severe retinal degeneration, fundoscopic and functional retinal changes have been demonstrated, suggesting a role for other factors, including polyunsaturated fatty acid deficiency and ongoing oxidative damage

Reference:

  • (1) J. Kane and R. Havel, Disorders of the biogenesis and secretion of lipoproteins containing the B apolipoproteins. In: C. Scriver, A. Beaudet, W. Sly and D. Valle, Editors, The Metabolic and Molecular Bases of Inherited Disease, McGraw-Hill, New York (2001): 2717-2752.
  • (2) Granot E, Kohen R.Oxidative stress in abetalipoproteinemia patients receiving long-term vitamin E and vitamin A supplementation, Am. J. Clin. Nutr. 2004;79: 226-230
  • (3) Sharp, D. et al. Cloning and gene defects in microsomal triglyceride transfer protein associated with abetalipoproteinaemia. Nature 1993;365: 65-9.

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