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16 May 2015 : Meta-Analysis  

Butyrylcholinesterase K Variant and Alzheimer’s Disease Risk: A Meta-Analysis

Zongcheng WangABCDEFG, Yuren JiangABCDEF, Xi WangBCD, Yangsen DuBCD, Dandan XiaoCF, Youchao DengC, Jinlian WangD

DOI: 10.12659/MSM.892982

Med Sci Monit 2015; 21:1408-1413

Abstract

BACKGROUND: Although many studies have estimated the association between the butyrylcholinesterase (BCHE) K variant and Alzheimer’s disease (AD) risk, the results are still controversial. We thus conducted this meta-analysis.

MATERIAL AND METHODS: We searched NCBI, Medline, Web of Science, and Embase databases to find all eligible studies. Odds ratios (ORs) with 95% confidence intervals (CIs) were used to assess the strength of the association.

RESULTS: We found a significant association between BCHE K variant and AD risk (OR=1.20; 95% CI 1.03–1.39; P=0.02). In the stratified analysis by ethnicity, we observed a significant association between BCHE K variant and AD risk in Asians (OR=1.32; 95% CI 1.02–1.72; P=0.04). However, no significant association between BCHE K variant and AD risk in Caucasians was found (OR=1.14; 95% CI 0.95–1.37; P=0.16). When stratified by the age of AD onset, we found that late-onset AD (LOAD) was significantly associated with BCHE K variant (OR=1.44; 95% CI 1.05–1.97; P=0.02). No significant association between BCHE K variant and early-onset AD (EOAD) risk was observed (OR=1.16; 95% CI 0.89–1.51; P=0.27). Compared with non-APOE ε4 and non-BCHE K carriers, no significant association between BCHE K variant and AD risk was found (OR=1.11; 95% CI 0.91–1.35; P=0.30). However, APOE ε4 carriers showed increased AD risk in both non-BCHE K carriers (OR=2.81; 95% CI 1.75–4.51; P=0.0001) and BCHE K carriers (OR=3.31; 95% CI 1.82–6.02; P=0.0001).

CONCLUSIONS: The results of this meta-analysis indicate that BCHE K variant might be associated with AD risk.

Keywords: Age of Onset, Aged, 80 and over, Alzheimer Disease - genetics, Apolipoprotein E4 - genetics, Asian Continental Ancestry Group - genetics, Butyrylcholinesterase - genetics, European Continental Ancestry Group - genetics, Genetic Predisposition to Disease, Odds Ratio, Polymorphism, Single Nucleotide, Publication Bias, Risk, Sensitivity and Specificity

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750