For the past 5 years, investigators from many different laboratories have contributed to a greatly increased understanding of two very important lipid-carrying proteins in plasma--apo B-100 and apo B-48. Apo B-100, an extremely large protein composed of 4,536 amino acids, is synthesized by the liver and is crucial for the assembly of triglyceride-rich VLDL particles. Apo B-100 is virtually the only protein of LDL, a cholesteryl ester-enriched class of lipoproteins that are metabolic products of VLDL. The apo B-100 of LDL serves as a ligand for the LDL receptor-mediated uptake of LDL particles by the liver and extrahepatic tissues. The LDL receptor-binding region of apo B-100 is located in the carboxyterminal portion of the molecule, whereas its lipid-binding regions appear to be broadly dispersed throughout its length. Apo B-48 contains the amino-terminal 2,152 amino acids of apo B-100 and is produced by the intestine as a result of editing of a single nucleotide of the apo B mRNA, which changes the codon...

Recent progress in understanding apolipoprotein B.

Familial defective apolipoprotein B-100: detection in the United Kingdom and Scandinavia, and clinical characteristics of ten cases.

Variation of apolipoprotein-B gene is associated with obesity, high blood cholesterol levels, and increased risk of coronary heart disease.

Gene-diet interaction in determining plasma lipid response to dietary intervention

DNA polymorphisms of the apolipoprotein B gene in patients with premature coronary artery disease.

DNA polymorphisms of the gene for apolipoprotein B in patients with peripheral arterial disease.

1. We have determined the frequency of DNA polymorphisms of the human apolipoprotein AI-CIII-AIV gene cluster, detected with XmnI, PstI, and PvuII, in a group of patients with peripheral arterial disease. 2. Of the patients, 81 had no evidence of disease in the coronary and carotid arteries, 73 had coronary artery disease but no evidence of carotid artery disease, 25 patients had carotid artery disease but no evidence of coronary artery disease, and 38 had both coronary and carotid artery disease. 3. Levels of triacylglycerol, cholesterol, apolipoprotein B and apolipoprotein AI were not significantly different between the four patient groups. 4. The frequencies of the alleles for the apolipoprotein AI-CIII-AIV polymorphisms, detected with XmnI, PstI and PvuII, did not differ significantly in the patient groups when compared with a sample of clinically well normolipidaemic individuals also from a London population. 5. All five patients with the XmnI genotype we designate X2X2 had high levels of cholesterol, apolipoprotein B and apolipoprotein AI. 6. Patients with the rare VB2 allele of the apolipoprotein CIII-AIV restriction fragment length polymorphism had lower levels of cholesterol, acylglycerol and significantly lower levels of serum apolipoprotein. 7. Our observations suggest that variation in the apolipoprotein AI-CIII-AIV gene cluster may not be contributing significantly to the development of peripheral arterial disease, but variation associated with some of the restriction fragment length polymorphisms may be involved in determining levels of cholesterol- and apolipoprotein-B-containing lipoproteins.

Study of DNA polymorphisms of the apolipoprotein AI-CIII-AIV gene cluster in patients with peripheral arterial disease

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DNA polymorphisms of the gene for apolipoprotein B in patients with peripheral arterial disease.

Study of DNA polymorphisms of the apolipoprotein AI-CIII-AIV gene cluster in patients with peripheral arterial disease