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Molecular genetic approaches to the identification of genes involved in the development of nephropathy in insulin-dependent diabetes mellitus.

A S Krolewski, A Doria, J Magre, J H Warram and D Housman
JASN October 1992, 3 (4) S9;
A S Krolewski
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A Doria
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J Magre
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J H Warram
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D Housman
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Abstract

Genetic factors contribute significantly to the development of diabetic nephropathy in patients with insulin-dependent diabetes mellitus. This report discusses some models of diabetic nephropathy that incorporate genetic susceptibility and presents strategies for identifying the responsible genes. To identify variation at a locus, newly developed methods are discussed that employ denaturing gradient gel electrophoresis to study sequence differences in both polymerase chain reaction-amplified DNA fragments and genomic DNA. These techniques are illustrated with studies of the angiotensinogen gene and the insulin receptor gene. In preliminary data from a comparison between individuals with and without diabetic nephropathy, no DNA sequence difference in that part of the angiotensinogen gene that codes for angiotensin I was found. However, with a probe corresponding to exons 7 and 8 of the insulin receptor gene and denaturing gradient gel electrophoresis of Rsal digestions of genomic DNA, different distributions of a DNA polymorphism were found in patients with fast as compared with slowly progressing nephropathy. The interpretation of this finding and the need for further studies are discussed. In conclusion, the advent of methods of molecular genetics makes possible studies on genetic determinants of diabetic nephropathy. However, more clinical and epidemiologic data are needed to find out how many genes are involved and how they interact with exposure to diabetes. Foremost, DNA from families with two or more siblings with diabetic nephropathy must be collected to permit the necessary genetic studies.

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Journal of the American Society of Nephrology
Vol. 3, Issue 4
1 Oct 1992
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Molecular genetic approaches to the identification of genes involved in the development of nephropathy in insulin-dependent diabetes mellitus.
A S Krolewski, A Doria, J Magre, J H Warram, D Housman
JASN Oct 1992, 3 (4) S9;

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Molecular genetic approaches to the identification of genes involved in the development of nephropathy in insulin-dependent diabetes mellitus.
A S Krolewski, A Doria, J Magre, J H Warram, D Housman
JASN Oct 1992, 3 (4) S9;
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