The polymorphic markers of АРОВ and APOE genes and the chromosomal region 3q21-q25 are associated with the development of diabetic nephropathy in type 1 diabetes mellitus

Early studies of the association of a large group of gene candidates indicated that only the polymorphic markers of angiotensin-converting enzyme (ACE) I gene and endothelial vascular cell NO-synthetase (NOS3) gene were associated with diabetic nephropathy (DN) in type 1 diabetes mellitus. The purpose of this study was to examine DN predisposition in patients with type 1 DM, by using the polymorphic markers of the genes of apolipoproteins Е (АРОЕ) and В (АРОВ) which encode for lipid metabolic proteins, as well as polymorphic microsatellites in the chromosomal region 3q21-q25. Two groups of patients of patients with type 1 DM with (n = 54) and without (n = 65) DN were examined to analyze the gene association with DN. Analyzing the frequencies of the alleles and genotypes of the polymorphic marker E2/E3/E4 ofAPOR gene has indicated that the carriers of the allele E3 and the genotype E3/ E3 have a higher risk for DN (OR = 2.08 and 2.16, respectively). In case of АРОВ gene, the carriers of allele I and genotype II of the polymorphic marker I/D have been ascertained to have a higher risk for DN (OR = 1.91 and 2.11, respectively) while those of allele Dhave, on the contrary, a lower risk for DN (OR = 0.52). The authors have revealed an association of a group of polymorphic microsatellites with DN in the chromosomal region 3q21-q25. There is the greatest association for the marker D31550. The carriers of allele 12 (OR = 4.85) and genotype 12/14 (OR = 6.25) have a much higher risk for DN. In all probability, in the chromosomal region 3q21-q25, there is a major gene that initiates the development of DN whereas other genes associated with DN affect the rate of its progression to a greater extent. Thus, among the Moscow Russian dwellers suffering from type 1 DM, the progression of DN is mainly associated with the genes of ACE, NOS3, APOE, and АРОВ while the major gene that determines the first stages of DN development in type 1 DM is likely to be located in the chromosomal region 3q21-q25.

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