SNP in the Adiponectin Gene Is Associated with Decreased Serum Adiponectin Levels and Risk for Impaired Glucose Tolerance

• Published in: Obesity (Silver Spring, Md.) Md.), 2005-05, Vol.13 (5), p.807-812
• Main Authors: González-Sánchez, José L, Zabena, Carina A, Martínez-Larrad, María T, Fernández-Pérez, Cristina, Pérez-Barba, Milagros, Laakso, Markku, Serrano-Ríos, Manuel
• Format: Article
• Language: English
• Subjects: abdominal fat; adipocytes; Adiponectin; Adult; Aged; blood proteins; BMI; body mass index; Female; Gene Frequency; genes; Genetic Predisposition to Disease; Genotype; Glucose Intolerance - genetics; glucose tolerance; Humans; hyperglycemia; hypoadiponectinemia; impaired glucose tolerance; insulin resistance; Intercellular Signaling Peptides and Proteins - blood; Intercellular Signaling Peptides and Proteins - genetics; leptin; Male; metabolic syndrome; Middle Aged; noninsulin-dependent diabetes mellitus; obesity; overweight; Phenotype; Polymorphism, Single Nucleotide; risk factors; single nucleotide polymorphism; waist-to-hip ratio
• ISSN: 1071-7323; 1930-7381; 1550-8528; 1930-739X
• DOI: 10.1038/oby.2005.91

Adiponectin is a plasma protein produced by the adipose tissue. Hypoadiponectinemia has been associated with insulin resistance and several components of the metabolic syndrome (MS): type 2 diabetes, obesity, and dyslipidemia. We investigated whether single nucleotide polymorphisms (SNPs) at positions 45 and 276 in the adiponectin gene were associated with features of the MS in 747 unrelated Spanish subjects. The G allele of SNP45 and the G/G genotype of SNP276 were associated with impaired glucose tolerance (p = 0.020 and 0.042, respectively). The G/G genotype for SNP276 was associated with lower serum adiponectin levels as compared with the G/T and T/T genotypes (G/G, 10.10 ± 0.24 [micro]g/mL; G/T, 10.98 ± 0.32 [micro]g/mL; T/T, 12.00 ± 0.92 [micro]g/mL; p = 0.015) even after adjustment for sex, age, BMI, waist-to-hip ratio, homeostasis model assessment index, and the degree of glucose tolerance (p = 0.040). We found a significant negative association of circulating adiponectin levels with waist-to-hip ratio (r = -0.42, p < 0.001), sagittal abdominal diameter (r = -0.24, p < 0.001), triglycerides (r = -0.32, p < 0.001), homeostasis model assessment index (r = -0.14, p = 0.001), and uric acid (r = -0.36, p < 0.001) and positive association with high-density lipoprotein-cholesterol (r = 0.41, p < 0.001). Our findings indicate that serum adiponectin levels are associated with several components of the MS. The SNP276 of the adiponectin gene may affect impaired glucose tolerance and hypoadiponectinemia.