Rs1888747 polymorphism in the FRMD3 gene, gene and protein expression: role in diabetic kidney disease. Issue 1 (December 2016)

• Record Type: Journal Article
• Authors: Buffon, Marjoriê; Carpena, Mariana; Sortica, Denise; Santer, Andressa; Carlessi, Rodrigo; Souza, Bianca; Edelweiss, Maria; Berger, Milton; Crispim, Daisy; Canani, Luís
• Is Part Of: Diabetology & metabolic syndrome. Volume 8:Issue 1(2016)
• Page Start: 1
• Page End: 10
• Publication Date: 2016-12
• Subjects: FRMD3 gene expression -- Polymorphism -- Human kidney -- Diabetic kidney disease; Diabetes -- Pathophysiology -- Periodicals; Metabolic syndrome -- Periodicals; 616.462005
• DOI: 10.1186/s13098-015-0121-5
• Languages: English
• ISSNs: 1758-5996

Abstract

Abstract Background We carried out a case–control study in patients with type 2 diabetes mellitus (T2DM) to evaluate the association between seven single nucleotide polymorphisms (SNPs) previously described to be linked to diabetic kidney disease (DKD) in type 1 diabetes mellitus (T1DM). Additionally, we evaluated gene and protein expression related to the polymorphism associated with DKD. Methods The association study included 1098 T2DM patients (718 with DKD and 380 without DKD). Out of the 13 polymorphisms associated with DKD in a previous study with T1DM, seven were chosen for evaluation in this sample: rs1888747, rs9521445, rs39075, rs451041, rs1041466, rs1411766 and rs6492208. The expression study included 91 patients who underwent nephrectomy. Gene expression was assessed by RT-qPCR and protein expression in kidney samples was quantified by western blot and it localization by immunohistochemistry. Results The C/C genotype of rs1888747 SNP was associated with protection for DKD (OR = 0.6, 95 % CI 0.3–0.9; P = 0.022). None of the other SNPs were associated with DKD. rs1888747 is located nearFRMD3 gene. Therefore, FRMD3 gene and protein expression were evaluated in human kidney tissue according to rs1888747 genotypes. Gene and protein expression were similar in subjects homozygous for the C allele and in those carrying the G allele. Conclusions Replication of the association between rs1888747 SNP and DKD in a different population suggests that this link is not the result of chance. rs1888747 SNP is located at theFRMD3 gene, which is expressed in human kidney. Therefore, this gene is a candidate gene for DKD. However, in this study, no rs1888747 genotype or specific allele effect on gene and/or protein expression of theFRMD3 gene was demonstrated.