eISSN: 1896-9151
ISSN: 1734-1922
Archives of Medical Science
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vol. 13
Clinical research

Apolipoprotein A1 polymorphisms and risk of coronary artery disease: a meta-analysis

Lang-Biao Xu, Ya-Feng Zhou, Jia-Lu Yao, Si-Jia Sun, Qing Rui, Xiang-Jun Yang, Xiao-Bo Li

Arch Med Sci 2017; 13, 4: 813–819
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Introduction: It has been reported that APOA1 –75G/A polymorphism might be associated with susceptibility to coronary artery disease (CAD). Owing to mixed and inconclusive results, we conducted a meta-analysis to systematically summarize and clarify the association between APOA1-75G/A polymorphism and the risk of CAD.

Material and methods: A systematic search of studies on the association of single nucleotide polymorphisms (SNP) with susceptibility to CAD was conducted. A total of 9 case-control studies (1864 cases and 1196 controls) on the APOA1-75G/A polymorphism were included.

Results: We observed no statistically significant association between APOA1 –75G/A polymorphism and risk of CAD under the dominant genetic model (AA + AG vs. GG: OR = 1.03, 95% CI: 0.65–1.66), allelic contrast (A vs. G: OR = 0.88, 95% CI: 0.58–1.32), heterozygote model (AG vs. GG: OR = 1.24, 95% CI: 0.81–1.89) or homozygote model (AA vs. GG: OR = 0.52, 95% CI: 0.26–1.05). Significant heterogeneity between individual studies appears in all five models, but a strong association under the recessive genetic model (AA vs. AG + GG: OR = 0.51, 95% CI: 0.28–0.92). In the subgroup analysis by Hardy-Weinberg equilibrium (HWE; the presence or absence of HWE in controls), significantly decreased CAD risk and no significant heterogeneity were observed among controls consistent with HWE. Overall, the APOA1 A allele is one of the protective factors of CAD. A stronger association between APOA1-75G/A polymorphisms and CAD risk was present in the studies consistent with HWE.

Conclusions: The minor allele of the APOA1-75G/A polymorphism is a protective factor for CAD, especially in the studies consistent with HWE.

apolipoprotein A1, odds ratio, gene polymorphism, confidence interval, coronary artery disease, Hardy-Weinberg equilibrium

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