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  • Title: Genetic variations associated with diabetic nephropathy and type II diabetes in a Japanese population.
    Author: Maeda S, Osawa N, Hayashi T, Tsukada S, Kobayashi M, Kikkawa R.
    Journal: Kidney Int Suppl; 2007 Aug; (106):S43-8. PubMed ID: 17653210.
    Abstract:
    Genetic susceptibility plays an important role in the pathogenesis of diabetic nephropathy and type II diabetes. To identify the genetic polymorphisms associated with diabetic nephropathy and type II diabetes, we performed a genome-wide association study using single-nucleotide polymorphisms as genetic markers. We also analyzed polymorphisms within the genes encoding for the renin-angiotensin system that were considered as candidate genes for diabetic nephropathy susceptibility and the transcription factor 7-like 2 (TCF7L2) as a candidate for type II diabetes, in a large cohort of a Japanese population. A genome-wide association study identified SLC12A3 and engulfment and cell motility 1 gene as the new candidates for diabetic nephropathy and transcription factor-activating protein 2beta as a novel susceptibility gene for type II diabetes; this observation was based on the significant association between the polymorphisms within the genes and the corresponding diseases (P<0.0001). Further, we discovered that the genes encoding the angiotensin-converting enzyme, angiotensinogen, and angiotensin II type I receptor have a significant combinational effect on conferring susceptibility to diabetic nephropathy. Furthermore, TCF7L2 that has been reported as a convincing susceptibility gene for type II diabetes in Caucasian populations was also shown to be associated with type II diabetes in a Japanese population. These genes could be considered as strong susceptibility genes for diabetic nephropathy and type II diabetes in the Japanese, although the new candidates that have been identified by genome-wide screening need to be examined in greater detail by several replication studies.
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