Supplementary Material for: Cubilin Single Nucleotide Polymorphism Variants are Associated with Macroangiopathy While a Matrix Metalloproteinase-9 Single Nucleotide Polymorphism Flip-Flop may Indicate Susceptibility of Diabetic Nephropathy in Type-2 Diabetic Patients

Aim: Aim of this study was to investigate the association of genetic variants of functional polymorphisms of matrix metalloproteinase and Cubilin (CUBN) with diabetic nephropathy (DN), end-stage renal disease (ESRD), and risk of cardiovascular disease (CVD) in Caucasian type 2 diabetes (T2D) patients. Methods: 472 T2D-patients were genotyped for 3 single-nucleotide polymorphisms (SNPs; MMP-2 [rs2285053], MMP-9 [rs17576] and CUBN [rs1801239]). Genotyping was carried out by allelic discrimination using TaqMan SNP-genotyping-assay. Results: MMP-9 (Gln279Arg) AA-genotype (OR 0.17 [0.04–0.62, p = 0.008]) and the time elapsed since diagnosis of T2D without onset of proteinuria (OR 0.87 [0.79–0.97, p = 0.008]) were found to be independently associated with reduced risk of susceptibility to DN. On the contrary higher stages of chronic kidney disease (OR 1.93 [1.15–3.23], p = 0.012) and the presence of MMP-9 GG-genotype were independently associated with DN (OR 6.07 [1.60–22.99], p = 0.008). The CUBN CC or C-risk-allele of rs1801239 was associated with ESRD (OR 2.04 [1.07–3.87], p = 0.03) and peripheral artery disease (OR 2.08 [1.12–3.88], p = 0.021). We could not find an association with MMP-2, MMP-9, or CUBN with CVD in a composite clinical endpoint model. Conclusions: This study highlights that MMP-9 or CUBN-SNPs may exert effects on risk of susceptibility to DN or ESRD. We provide novel evidence on genetic susceptibility for macroangiopathy in patients with a missense variant of CUBN (Ile2984Val) in patients with T2D.