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J. Lipid Res.
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Journal of Lipid Research, Vol 31, 1255-1261, Copyright © 1990 by Lipid Research, Inc.


ARTICLES

Apolipoprotein B signal peptide insertion/deletion polymorphism is associated with Ag epitopes and involved in the determination of serum triglyceride levels

CF Xu, MJ Tikkanen, JK Huttunen, P Pietinen, R Butler, S Humphries and P Talmud
Charing Cross Sunley Research Centre, London, U.K.

We have investigated the insertion/deletion polymorphism in the signal peptide region of the apoB gene in 106 Finnish individuals from North Karelia. The relative frequency of the insertion allele in this sample was 0.73. Strong linkage disequilibrium was detected between this apoB insertion/deletion polymorphism and the Ag(c/g) epitope pair of apoB, while weak linkage disequilibrium was detected between the polymorphism and the four other reported Ag epitope pairs [(a1/d), (x/y), (h/i) and (t/z)], as well as the apoB PvuII and the XbaI RFLPs. Using one-way analysis of variance there was a statistically significant association (P less than 0.05) between the apoB insertion/deletion polymorphism and serum triglyceride levels in this sample. Individuals homozygous for the insertion allele had higher triglyceride levels than individuals homozygous for the deletion allele, while individuals heterozygous for the polymorphism had intermediate levels. These differences were reduced when individuals were consuming a low fat diet but were statistically significant when the individuals returned to their normal diet. It is possible that insertion or deletion of three hydrophobic amino acids (leu-ala-leu) from the signal peptide of apoB may have a direct effect on plasma triglyceride levels by altering the intracellular processing of apoB or apoB-containing lipoproteins in the liver or intestine.
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