Novel ERBB receptor feedback inhibitor 1 (ERRFI1) + 808 T/G polymorphism confers protective effect on diabetic nephropathy in a Korean population.

BACKGROUND

The identification and characterization of the gene, ERRFI1, in diabetes has not been reported. In this study, we evaluated the relationship between ERRFI1 polymorphism and characteristics of type 2 diabetes mellitus (T2DM) in Korea.

SUBJECTS AND METHODS

We conduct a case-control study involving T2DM patients (n=342) and controls (n=473).

RESULTS

A novel single nucleotide ERRFI1 gene polymorphism at +807(T/G) was found. G genotype frequency was 40.1% in the diabetic group and 42.7% in the control group; the difference was not significant (p=0.45). In the diabetic group, the urine albumin to creatinine ratio (ACR) was lower in the G genotype than in the T genotype (P=0.004). In males with T2DM, those with the G genotype displayed lower systolic blood pressure (P=0.01) and higher glomerular filtration rate (P=0.048) compare to those with the T genotype. In females with T2DM, urine ACR was low in those with the G genotype than in those with the T genotype (P=0.02). In the diabetic group, patients who harboring T allele had a 1.81 times higher risk of diabetic nephropathy than the G allele (95% CI 1.11-2.96, P=0.02). In females with T2DM, patients who harboring T allele had a 2.12 times higher risk of diabetic nephropathy (95% CI 1.07-4.1, P=0.03).

CONCLUSIONS

We identify new loci associated with glycemic traits in diabetes and this finding indicates the potential of ERRFI1 as a novel therapeutic target of diabetic nephropathy.