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Underexpression of the apolipoprotein E2 and E4 alleles in the Greek Cypriot population of Cyprus.

Abstract
Apolipoprotein E (APOE) plays an important role in the multifactorial etiology of both cardiovascular disease and Alzheimer’s disease. Polymerase chain reaction (PCR) was used to investigate the APOE gene polymorphism in 335 unrelated Greek Cypriots living on the island of Cyprus. For the most common APOE genotypes, the Greek Cypriots followed the general Caucasian European pattern of having higher genotypic frequencies of E3/3, followed by E3/4, and then E2/3. Among the European populations compared, Greek Cypriots exhibited the lowest relative frequency of the E3/4 genotype (12.83%). Also, the relative frequencies of the E2 and E4 alleles in Greek Cypriots were among the lowest around the world (5.4% and 7.0%, respectively). This was also demonstrated by using the complete and the average clustering methods of analysis where the APOE allele relative frequencies in Greek Cypriots were compared to 46 other populations. The Greek Cypriot population in these analyses clustered with populations mainly from south Europe and Japan which have low E2 and E4 allele frequencies. The Greek Cypriot population will be studied further for elucidating the effect(s) and the role of APOE in cardiovascular disease and the APOE4 allele as a possible metabolic factor affecting the rate of expression of both Alzheimer’s disease and vascular dementia.

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