Dataset Information

Association between APOC1 polymorphism and Alzheimer's disease: a case-control study and meta-analysis.

ABSTRACT:

Background

Previous association studies examining the relationship between the APOC1 polymorphism and susceptibility to Alzheimer's disease (AD) have shown conflicting results, and it is not clear if an APOC1 variant acts as a genetic risk factor in AD etiology across multiple populations.

Methods

To confirm the risk association between APOC1 and AD, we designed a case-control study and also performed a meta-analysis of previously published studies.

Results

Seventy-nine patients with AD and one hundred fifty-six unrelated controls were included in case-control study. No association was found between the variation of APOC1 and AD in stage 1 of our study. However, our meta-analysis pooled a total of 2092 AD patients and 2685 controls. The APOC1 rs11568822 polymorphism was associated with increased AD risk in Caucasians, Asians and Caribbean Hispanics, but not in African Americans. APOE ?4 carriers harboring the APOC1 insertion allele, were more prevalent in AD patients than controls (?(2)?=?119.46, OR?=?2.79, 95% CI?=?2.31-3.36, P<0.01).

Conclusions

The APOC1 insertion allele, in combination with APOE ?4, likely serves as a potential risk factor for developing AD.

SUBMITTER: Zhou Q

PROVIDER: S-EPMC3909044 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature

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Publications

Association between APOC1 polymorphism and Alzheimer's disease: a case-control study and meta-analysis.

Zhou Qin Q Zhao Fan F Lv Ze-ping ZP Zheng Chen-guang CG Zheng Wei-dong WD Sun Liang L Wang Na-na NN Pang Shenghang S de Andrade Fabiana Michelsen FM Fu Mian M He Xiang-hua XH Hui Juan J Jiang WenyYu W Yang Chu-yu CY Shi Xiao-hong XH Zhu Xiao-quan XQ Pang Guo-fang GF Yang Yi-ge YG Xie Hai-qun HQ Zhang Wan-dong WD Hu Cai-you CY Yang Ze Z

PloS one 20140131 1

<h4>Background</h4>Previous association studies examining the relationship between the APOC1 polymorphism and susceptibility to Alzheimer's disease (AD) have shown conflicting results, and it is not clear if an APOC1 variant acts as a genetic risk factor in AD etiology across multiple populations.<h4>Methods</h4>To confirm the risk association between APOC1 and AD, we designed a case-control study and also performed a meta-analysis of previously published studies.<h4>Results</h4>Seventy-nine pat ...[more]

PMID: 24498013

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Project description:The present study aimed to evaluate the association between rs11136000 in clusterin (CLU) and late-onset Alzheimer's disease (LOAD) by meta-analysis. Several databases including PubMed, EMbase, CBMdisc and CMCC were searched for relevant case-control studies based on defined selection criteria. Odds ratios (OR) and 95% confidence interval (CI) of the rs11136000 genotype and allele distribution were analyzed with RevMan and Stata software. The control population and heterogeneity between populations were examined in the selected studies using the Hardy-Weinberg equilibrium. Overall OR among the frequencies of the genotype and allele in both patients with AD and controls was estimated using fixed or random effect models. The summary of the OR and 95% CI were then analyzed to obtain the effects across the studies. Publication bias was examined using a funnel plot, Egger's test and Begg's test, and a Fail-safe Number (Nfs). A total of 20 reports were used. The summary OR for studies in the Caucasian population with a frequency of TT+TC/CC genotype and T/C allele at rs11136000 locus in CLU were 0.79 (95% CI, 0.73-0.86; P<0.00001) and 0.87 (95% CI, 0.85-0.90; P<0.00001). The summary OR for the studies conducted in the Asian population were 0.90 (95% CI, 0.81-0.99; P=0.04) and 0.87 (95% CI, 0.81-0.93; P<0.0001). The summary OR in other mixed ethnic groups with regards to the frequency of T/C allele was 0.82 (95% CI, 0.68-0.99; P=0.04). These results demonstrated the presence of a statistically significant difference in LOAD susceptibility between individuals with the T allele CLU rs11136000 polymorphism and those without. The studies conducted in populations of African descent or Hispanics showed no statistically significant difference. Negligible publication bias was present, with Nfs being 750.604. In summary, polymorphism rs11136000 in the CLU gene may contribute to susceptibility to LOAD, and the presence of the T allele may reduce the risk of LOAD in Caucasian and Asian populations. However, no definitive association was found between the presence of the CLU rs11136000 polymorphism and LOAD in populations of African or Hispanic descent.

Project description:Breast cancer is the most common cause of cancer death among women. Several studies have investigated the relationship between the C3435T polymorphism of ABCB1 gene and risk of breast cancer; but the results are conflicting. In the present study, we sought to assess the relationship between the C3435T polymorphism in ABCB1 gene and the risk of breast cancer in a sample of the Moroccan population.A case control study was performed on 60 breast cancer patients and 68 healthy women. The ABCB1 C3435T polymorphism was analyzed by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) assay. Furthermore, a meta-analysis including 16 studies with 6094 cases of breast cancer and 8646 controls was performed.Genotype frequencies were 50 % for CC, 33.3 % for CT and 16.7 % for TT in patients and 41.2 % for CC, 48.5 % for CT and 10.3 % for TT respectively in the control group. This difference was not statistically significant. The same trend as observed in the allele distribution between patients and controls (P?=?0.84). Findings from the meta-analysis showed that the ABCB1 C3435T polymorphism was not associated with an increased risk of breast cancer in the dominant model (OR?=?0.907; 95 % CI?=?0.767-1.073; P?=?0.25) as well as in the recessive model (OR?=?1.181; 95 % CI?=?0.973-1.434; P?=?0.093) and in the allele contrast model (OR?=?1.098; 95 % CI?=?0.972-1.240; P?=?0.133). However, the stratification of studies on ethnic basis showed that the TT genotype was associated with the risk of breast cancer in Asians (OR?=?1.405; 95 % CI?=?1.145-1.725; P?=?0.001), Caucasians (OR?=?1.093; 95 % CI?=?1.001-1.194; P?=?0.048) and North African (OR?=?2.028; 95 % CI?=?1.220-3.371; P?=?0.006).We have noted that the implication of C3435T variant on the risk of breast cancer was ethnicity-dependent. However, there is no evidence that ABCB1 C3435T polymorphism could play a role in susceptibility to breast cancer in Morocco. Further studies with a larger sample size, extended to other polymorphisms are needed to understand the influence of ABCB1 genetic variants on the risk of breast cancer.

Dataset Information

Association between APOC1 polymorphism and Alzheimer's disease: a case-control study and meta-analysis.

Background

Methods

Results

Conclusions

Publications

Association between APOC1 polymorphism and Alzheimer's disease: a case-control study and meta-analysis.

Similar Datasets

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