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Am J Hum Genet. May 1980; 32(3): 339–347.
PMCID: PMC1686062

Genetics of the apolipoprotein E-system in man

Abstract

The polymorphism of apolipoprotein E (Apo E) in man is controlled by two codominant alleles, Apo En and Apo Ed, at the Apo E-N/D locus and by two alleles, the dominant, Apo E4+, and the recessive, Apo E4o, at the Apo E4 locus.

Frequency distribution analysis of Apo E phenotypes demonstrated a highly significant association between both systems (P ~ 1%). The Apo E4-(+) variant was about twice as frequent in phenotype Apo E-N (30.1%) than in phenotype Apo E-ND (16.4%). The phenotypic combination Apo E-D/-E4(+) was not observed. The segregation of Apo E phenotypes in informative matings is consistent with a close linkage of both loci.

The results may be explained by different models. On the basis of the present data, these models cannot be distinguished by formal genetic criteria. (1) Haplotypes Apo En/E4+, Apo En/E4o, and Apo Ed/E4o determine the different phenotypes, and a linkage disequilibrium exists of Δ = .0147 between the E-N/D and E4 loci. (2) The fourth haplotype, Apo Ed/E4+, exists, but the gene E4+ is not expressed in coupling with Apo Ed. The four-haplotype model seems more attractive in view of Apo E-N/D polymorphism's quantitative character and of biochemical results, which show that phenotypes Apo E-N and Apo E-D differ in the apparent molecular weight (Mr) of the respective major Apo E polymorphic form. Hence, the Apo E-N/D locus may control structural genes involved in the posttranslational modification of Apo E. (3) Finally, there may exist only one Apo E structural gene locus but with mutations at two sites susceptible to posttranslational modification.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Utermann G, Hees M, Steinmetz A. Polymorphism of apolipoprotein E and occurrence of dysbetalipoproteinaemia in man. Nature. 1977 Oct 13;269(5629):604–607. [PubMed]
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  • Utermann G. Isolation and partial characterization of an arginine-rich apolipoprotein from human plasma very-low-density lipoproteins: apolipoprotein E. Hoppe Seylers Z Physiol Chem. 1975 Jul;356(7):1113–1121. [PubMed]
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