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. 1993 Oct;92(4):2060–2064. doi: 10.1172/JCI116802

A missense mutation in the cholesteryl ester transfer protein gene with possible dominant effects on plasma high density lipoproteins.

K Takahashi 1, X C Jiang 1, N Sakai 1, S Yamashita 1, K Hirano 1, H Bujo 1, H Yamazaki 1, J Kusunoki 1, T Miura 1, P Kussie 1, et al.
PMCID: PMC288375  PMID: 8408659

Abstract

Plasma HDL are a negative risk factor for atherosclerosis. Cholesteryl ester transfer protein (CETP; 476 amino acids) transfers cholesteryl ester from HDL to other lipoproteins. Subjects with homozygous CETP deficiency caused by a gene splicing defect have markedly elevated HDL; however, heterozygotes have only mild increases in HDL. We describe two probands with a CETP missense mutation (442 D:G). Although heterozygous, they have threefold increases in HDL concentration and markedly decreased plasma CETP mass and activity, suggesting that the mutation has dominant effects on CETP and HDL in vivo. Cellular expression of mutant cDNA results in secretion of only 30% of wild type CETP activity. Moreover, coexpression of wild type and mutant cDNAs leads to inhibition of wild type secretion and activity. The dominant effects of the CETP missense mutation during cellular expression probably explains why the probands have markedly increased HDL in the heterozygous state, and suggests that the active molecular species of CETP may be multimeric.

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Selected References

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