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Journal Article
Research Support, Non-U.S. Gov't
Review
The genetic basis of primary disorders of intestinal fat transport.
For decades, research interest has focused on hypertriglyceridemia and hypercholesterolemia, because of their association with atherosclerosis. Recently, however, increasing attention has been paid to rare hypolipidemic states that can cause adverse consequences in young patients. Studies of genetic disorders of fat transport have afforded new insights into the mechanisms involved in intestinal lipid handling and lipoprotein metabolism. This article reviews briefly the current state of knowledge about inherited lipoprotein deficiencies, including abetalipoproteinemia, hypobetalipoproteinemia and chylomicron retention disease. These disorders share many common characteristics: they all cause fat malabsorption, low levels of circulating lipids and fat-soluble vitamins, failure to thrive in early childhood, ataxic neuropathy and visual impairment. However, their etiology is genetically different. Abetalipoproteinemia is caused by the absence of microsomal transfer protein, whereas hypobetalipoproteinemia is due to defects in the apolipoprotein B gene. The etiopathogenesis of chylomicron retention disease is as yet unexplained. Research on these rare, inherited fat disorders of absorption will continue to provide significant advances in our understanding of human physiology and may yield novel therapeutic approaches to atherosclerosis.
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