Association between the APOA2 rs3813627 Single Nucleotide Polymorphism and HDL and APOA1 Levels Through BMI

Area of Science:

• Genetics
• Biochemistry
• Obesity Research

Background:

• High-density lipoprotein (HDL) levels are influenced by both obesity and genetic factors.
• Genetic heritability of serum HDL is significant, but identified variants explain limited variation.
• The apolipoprotein type 2 (APOA2) gene plays a role in lipid metabolism.

Purpose of the Study:

• To investigate the association between the APOA2 rs3813627 single nucleotide polymorphism (SNP) and anthropometric/biochemical variables.
• To explore the role of body mass index (BMI) as a mediator in these associations.
• To understand the genetic basis of HDL and apolipoprotein A1 (APOA1) level variations.

Main Methods:

• Genotyping of the APOA2 rs3813627 SNP in 153 subjects (91 overweight/obese, 62 non-obese).
• Analysis of associations between the SNP and anthropometric/biochemical variables, including BMI, HDL, and APOA1.
• Mediation analysis to assess the role of BMI.
• Bioinformatic analysis of the SNP's location within the APOA2 gene promoter.

Main Results:

• The APOA2 rs3813627 TT genotype was linked to lower HDL and APOA1 levels in overweight/obese individuals (p < 0.05).
• Correlation analysis showed a negative association between HDL/APOA1 levels and the APOA2 rs3813627 SNP under a recessive model (p < 0.05).
• Mediation analysis indicated that BMI fully mediated the effect on HDL and partially mediated the effect on APOA1 (p < 0.05).

Conclusions:

• The APOA2 rs3813627 SNP is associated with increased susceptibility to low HDL and APOA1 levels.
• Increased BMI acts as a mediator for the effect of the APOA2 rs3813627 SNP on HDL and APOA1 levels.
• The rs3813627 SNP's location in the APOA2 promoter suggests a regulatory role in gene expression.