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Polymorphisms in insulin-like growth factor-binding protein 1 are associated with impaired renal function in Type-2 diabetes mellitus

Stephens RH, McElduff P, Heald A, New JP, Worthington J, Ollier WER, Gibson JM

Diabetes. 2005;54(12):3547-53.

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Vascular Research Group, Hope Hospital, Salford, UK. dysregulation of the IGF system has been implicated in the pathogenesis of obesity, diabetes, and diabetes complications such as nephropathy, but little is known about the genomics of the IGF system in health and disease. We genotyped 13 single nucleotide polymorphisms (SNPs) in IGFBP1 gene in 732 representative type 2 diabetic patients from the Salford Diabetes Register. Of the 13 SNPs, 8 were polymorphic and 7 of those had minor allele frequencies >0.1, one of which was in the gene promoter and one of which was nonsynonymous in exon 4. The minor alleles of these SNPs and two others were associated with a reduced prevalence of diabetic nephropathy. Haplotype analysis revealed that 97% of the genetic variation for IGFBP1 in the population sample could be accounted for using two of the "reno-protective" SNPs, with other SNPs adding little extra information. One of these two SNPs was the nonsynonymous mutation in exon 4, lying close to the integrin-binding RGD motif, which is thought to affect tissue delivery of IGF-I by IGF-binding protein 1 (IGFBP-1), possibly suggesting a "reno-protective" effect via altered IGFBP-1 binding. In conclusion, we have described the first genomic markers to be associated with diabetic microvascular complications within the human IGFBP1 gene.PMID: 16306374 [PubMed - indexed for MEDLINE]

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29th August, 2009, 16:14:28
Last modified:
20th July, 2015, 13:14:30

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