Abstract
The apolipoprotein (apo) E polymorphism has been related to differences in lipoprotein metabolism and lipid/lipoprotein concentrations in a number of studies. Whether these associations are seen in insulin-dependent diabetes mellitus (IDDM), which itself affects many of the same aspects of lipoprotein metabolism as does the apo E polymorphism, is unknown. The present study is an investigation into the influence of apo E phenotype on lipoprotein concentrations in a large group of IDDM patients (n = 433) participating in the Pittsburgh Epidemiology of Diabetes Complications (EDC) Study. The frequency of the three apo E alleles 2, 3, and 4 did not differ in this population from that reported in general white populations. Although the diabetic subjects show the same trends as seen in the general population, ie, apo E-2 is associated with lower and apo E-4 with higher low-density lipoprotein cholesterol (LDLc) compared with apo E3 ( P< .03), they also show relationships with glycemic control that influence the relative levels of lipid measures with respect to apo E phenotype. Results also raise the possibility that lipoprotein composition varies according to apo E phenotype in IDDM.
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