[Analysis of the interaction of the polymorphisms of presenilin-1 gene and ApoE gene in Alzheimerns disease].
OBJECTIVE: To explore the interaction of the polymorphism of 3' -terminal intron of the eighth exon of presenilin-1(PS-1) gene with the polymorphism of apolipoprotein E(ApoE) gene in the pathogenesis of sporadic Alzheimerns disease(SAD). METHODS: The polymorphisms of 3'-terminal intron of the eighth exon of presenilin-1 gene and ApoE gene were detected by using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) technique in 75 patients with SAD and 73 normal controls. RESULTS: The polymorphisms of PS-1 gene and ApoE gene were associated obviously with SAD. The onset of SAD was negatively associated with allele 2 of PS-1 gene and E(2) allele of ApoE gene,and it was positively associated with allele 1 of PS-1 gene. The onset of SAD was not associated with E(3) allele and E(4) allele of ApoE gene. CONCLUSION: These results indicated that allele 2 of PS-1 gene and E(2) allele of ApoE gene might protect people from SAD, that allele 1 of PS-1 gene might increase the risk of the onset of SAD, and that the onset of SAD was not associated with the interaction of the polymorphisms of PS-1 gene and ApoE gene.