Association between APOA1 gene (rs670) single-nucleotide polymorphism and dyslipidaemia: a systematic review and meta-analysis

Background: Metabolic syndrome and dyslipidaemia increase the risk of death by two or three times. In this context, the role of apolipoprotein A-I (Apo A-I), the main structural protein of high-density lipoprotein (HDL), stands out, since its anti-inflammatory potential reduces cardiovascular risk. Further, genetic modifications, such as the rs670 single-nucleotide polymorphism (SNP), in the promoter region of the APOA1 gene are associated with the development of cardiovascular events, dyslipidemia, and diabetes, as well as metabolic syndrome. Thus, this study aims to investigate the relation between the occurrence of dyslipidemia and the rs670 SNP genotypes. Methods: An integrative and systematic review was performed with the LitVar2 database according to the PRISMA protocol standards. Studies were researched up to August 2025. Then, a meta-analysis was performed using the fixed-effects model, since the study was considered homogeneous based on the I2 value (< 50%). Results: Of the 99 found articles in the database, 5 referred to metabolic disorders (n = 7,705—4 Chinese studies and 1 Iranian study) and were published between 2015 and 2018. Three (n = 2,784 patients or 36.13%) of the articles indicated an association between the polymorphic allele and a higher risk of developing dyslipidemia with a relative risk of 1.16 (IC 95% 1.09–1.23, p < 0.01, I2 = 0%). Relative risk (IC 95%) was presented, and p < 0.05 was defined as the significance criterion. Discussion: This study reinforces a possible association between the influence of SNP rs670 and dyslipidemia. This emphasizes the importance of conducting further research incorporating a larger and more diverse study group, as well as investigating the genetic and environmental influence on the phenotypic expression of the rs670 SNP.