| Abstract
| - Background. An XbaI polymorphism in the gene encoding the glucose transporter, GLUT-1, is associated with development of diabetic nephropathy in Chinese type 2 diabetic patients. In addition, an amino acid variant (K121Q) in the gene encoding the glycoprotein plasma cell differentiating antigen (PC-1), a specific inhibitor of insulin receptor signalling, has been reported to predict a faster progression of nephropathy in Italian and British type 1 diabetic patients. Methods. The XbaI and K121Q polymorphisms were determined by PCR-RFLP in Danish type 1 diabetic patients with nephropathy (122 men/77 women, age 40.9±9.6 years, diabetes duration 27±8 years) and type 1 diabetic patients with persistent normoalbuminuria (118 men/74 women, age 42.7±10.2 years, diabetes duration 26±9 years). Proliferative retinopathy was present in 156 patients (40%), while 67 patients (17%) had no diabetic retinopathy. Results. There were no differences in the frequency of GLUT-1 XbaI genotypes between type 1 diabetic patients with diabetic nephropathy and type 1 diabetic patients with normoalbuminuria: 72 (41%)/87 (50%)/16 (9%) vs 94 (49%)/74 (39%)/24 (13%) had GLUT-1 XbaI +/+, +/− or −/− genotype respectively (NS). The frequency of PC-1 KK, KQ and QQ genotypes were 141 (71%)/52 (26%)/6 (3%) vs 138 (73%)/45 (24%)/7 (4%) in patients respectively with and without nephropathy (NS). Neither were associations between the investigated polymorphisms and simplex or proliferative retinopathy revealed. Conclusions. Neither the PC-1 K121Q nor the GLUT-1 XbaI polymorphism contribute to the genetic susceptibility of diabetic microvascular complications in Danish type 1 diabetic patients.
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