No association between the K variant of the butyrylcholinesterase gene and pathologically confirmed Alzheimer's disease

Human Molecular Genetics
A B SingletonC M Morris

Abstract

The polymorphic K variant of the butyrylcholinesterase ( BCHE-K ) gene recently has been demonstrated to have an elevated frequency in Alzheimer's disease (AD) patients carrying the epsilon4 allele of the apolipoprotein (APO E) gene when compared with a control population. We therefore genotyped a large series of pathologically confirmed AD patients and controls to confirm this association. We found no change in the frequency of this genetic variant, either in the AD group as a whole or in early- or late-onset patients when compared with age-matched controls. Stratification of these groups with reference to the APO E epsilon4 allele also showed no difference between AD and control groups. To determine if a biological effect were present, we also looked at senile plaque and neurofibrillary tangle densities in the frontal, temporal, parietal and occipital cortices in AD patients either carrying or not carrying a copy of the K variant. We found no difference in plaque or tangle load between these two groups in either the total, late-onset or early-onset AD subjects. Stratification of the total AD group in terms of APO E epsilon4 allele possession, and further comparison of plaque and tangle load between carriers and non-carriers o...Continue Reading

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