Abstract
Bleomycin hydrolase (BH), a cysteine protease from the papain superfamily, is considered to be a candidate for the beta-secretase, which is presumably involved in the production of beta-amyloid peptide. The G/G genotype of BH was identified as a significant risk factor for the development of Alzheimer's disease (AD) in subjects not carrying the apolipoprotein E epsilon4 allele (apoE-epsilon4). However, this finding was recently challenged. We studied this polymorphism in a homogenous sample of German AD patients and controls. The over-representation of the G/G genotype in AD patients could be confirmed, however it was more pronounced in apoE-epsilon4 carriers. Additional studies should be undertaken to increase the confidence that the BH polymorphism is associated with AD and to explore the relationship between BH and apoE.
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