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Abstract
Apoliproprotein E (apo E), a component of VLDL, HDL and chylomicron remnants, is inherited
at a single genetic locus with 3 common alleles (ϵ2, ϵ3 and ϵ4). ϵ2 homozygosity is
found in 0–2% of healthy populations, but in 75–100% of subjects with type III hyperlipoproteinaemia,
in whom an increased prevalence of glucose intolerance has previously been reported.
The lipoprotein abnormality associated with diabetes mellitus has features in common
with type III hyperlipoproteinaernia and both conditions lead to accelerated atherogenesis
with a similar anatomical distribution. We have therefore examined the frequency of
apo E genotypes in 120 subjects with insulin-treated diabetes mellitus (ITDM) and
107 healthy controls, and examined the effect of apo E polymorphism on lipoproteins
in the diabetic group. As in the general population, the apo E phenotype in ITDM was
a significant determinant of the total serum and LDL cholesterol concentrations which
were lowest in patients possessing the ϵ2 allele, intermediate in those homozygous
for ϵ3 and highest in those with an e4 allele. The observed gene frequences of ϵ2
(0.091), ϵ3 (0.780) and ϵ4 (0.130) were similar to those of the healthy control group
and those in the general population. However, there was an unexpected increase (P < 0.0002) in ϵ2 homozygosity of 6.7% compared to a prevalence of 0.8% predicted both
from the Hardy-Weinberg equilibrium and the 0.9% prevalence observed in the healthy
control group. This suggests either that ϵ2 homozygosity increases susceptibility
to the development of ITDM or that the two conditions are genetically linked. Of the
eight ϵ2 homozygotes with diabetes, one expressed the full clinical syndrome of type
III hyperlipoproteinaemia and broad β-lipoprotein was also detected in one other.
This suggests that the tendency to type III hyperlipoproteinaemia is greater in diabetic
than in previously studied non-diabetic ϵ2 homozygotes, although it is not inevitable
in the insulin replete patient.
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References
- Abnormal lipoprotein receptor-binding activity of the human E apoprotein due to cysteine-arginine interchange at a similar site.J. Biol. Chem. 1982; 257: 2518
- Polymorphism at the apolipoprotein E locus in relation to risk of coronary heart disease.Clin. Genet. 1984; 25: 310
- Importance of apolipoprotein E polymorphism in determining plasma lipid levels and atherosclerosis.in: 5th ed. Atherosclerosis. VII. Elsevier Science Publ, Amsterdam1986: 171
- Proposed nomenclature of apo E isoproteins, apo E genotypes and phenotypes.J. Lipid Res. 1982; 23: 911
- Role of the apolipoprotein polymorphism in determining normal plasma lipid and lipoprotein variation.Am. J. Hum. Genet. 1985; 37: 268
- Apolipoprotein E polymorphism and hyperlipidemia.Clin. Chem. 1984; 30: 641
- Apolipoprotein E phenotypes and hyperlipidemia.Hum. Genet. 1984; 65: 232
- Phenotype study of apolipoprotein E isoforms in hyperlipoproteinaemic patients.Lancet. 1982; 2: 405
- Hyperlipoproteinaemia type V and apolipoprotein E4.Lancet. 1982; 2: 934
- Genetic variation in human apolipoprotein E.J. Lipid Res. 1982; 23: 1174
- Familial dysbetalipoproteinaemia.Med. Clin. North. Am. 1982; 66: 441
- Familial type 3 hyperlipoproteinaemia (Dysbetalipoproteinemia).in: Stanbury J.B. Wyngaarden J.B. Fredrickson D.S. Goldstein J.L. Brown M.S. The Metabolic Basis of Inherited Disease. 5th ed. McGraw-Hill, New York1983: 655 (Ch. 32)
- Lipoprotein abnormalities in insulin-dependent diabetes mellitus.Lancet. 1986; 1: 1176
- Arteriosclerosis obliterans and associated risk factors in insulin dependent and non insulin dependent diabetes.Diabetes. 1980; 29: 882
- The distribution and chemical composition of ultracentrifugally separated lipoproteins in normal serum.J. Clin. Invest. 1955; 34: 1345
- Serum high density lipoprotein cholesterol-subfractions in type I (insulin dependent) diabetes mellitus.Clin. Chim. Acta. 1982; 120: 21
- Estimations of serum low density lipoprotein cholesterol without use of a preparative ultracentrifuge.Clin. Chem. 1972; 18: 499
- A comparison of methods for the immunoassay of serum apolipoprotein B in man.Clin. Chim. Acta. 1972; 71: 95
- A method for the identification of apolipoprotein E isoforms employing chemical precipitation and flat bed isoelectric focusing in agarose.Ann. Clin. Biochem. 1986; 23: 509
- Human very low density lipoprotein apolipoprotein E isoprotein polymorphism is explained by genetic variation and post-translational modification.Biochemistry. 1981; 20: 1033
- Apolipoprotein E polymorphism in health and disease.Am. Heart J. 1987; 113: 433
- Inverse relationship of serum HDL and HDL2 cholesterol to C peptide level in middle aged insulin-treated diabetics.Metabolism. 1985; 34: 715
- Postheparin plasma lipoprotein lipase and hepatic lipase in diabetes mellitus.Diabetes. 1977; 26: 11
- The human insulin receptor — DNA. The structure basis for hormone-activated transmembrane signalling.Cell. 1985; 40: 747
- Quantification of apolipoprotein E-isoforms in diabetes mellitus.Horm. Metab. Res. 1983; 15: 201
- Apolipoprotein E polymorphism and hyperlipemia in type II diabetes.Diabetes. 1986; 35: 1374
- Plasma apolipoproteins AI, AII, B, CI and E are glucosylated in hyperglycaemic diabetic subjects.Diabetes. 1985; 34: 452
Article info
Publication history
Accepted:
October 4,
1988
Received in revised form:
September 27,
1988
Received:
May 3,
1988
Identification
Copyright
© 1989 Published by Elsevier Inc.