Mice provide an experimental model of unparalleled flexibility for studying mammalian diseases. Inbred strains of mice exhibit substantial differences in their susceptibility to the renal complications of diabetes. Much remains to be established regarding the course of diabetic nephropathy (DN) in mice as well as defining those strains and/or mutants that are most susceptible to renal injury from diabetes. Through the use of the unique genetic reagents available in mice (including knockouts and transgenics), the validation of a mouse model reproducing human DN should significantly facilitate the understanding of the underlying genetic mechanisms that contribute to the development of DN. Establishment of an authentic mouse model of DN will undoubtedly facilitate testing of translational diagnostic and therapeutic interventions in mice before testing in humans.J (1), with costs for care of these patients projected to be $12 billion/yr by 2010 (1). Despite the high prevalence of DN, only 20 to 40% of all diabetic patients are prone to developing kidney failure, and family-based studies suggest that a significant genetic component confers risk for DN (2-4). Studies of diabetic mice suggest that, like people, mice exhibit differential susceptibility to diabetes and renal and cardiovascular diseases (5-7). In mice, identification of a strain that is prone to disease provides the relevant discriminator rather than identification of an individual who is at risk for diabetic complications. However, in contrast to people, each inbred mouse strain represents a genetically homogeneous and readily replenished resource that is amenable to repeated experimental study.Biomedical experimentation in mice affords significant advantages over experimentation in other species. These advantages include the development of diverse and unique genetic resources, including completion of a detailed map of murine genomic sequence that is freely available through the internet, as well as Ͼ450 inbred strains of mice that have been generated over the past century, with each strain genetically being homogeneous and offering a unique array of phenotypes (8,9). The availability of murine embryonic stem cells has also provided the ability to disrupt the expression and function of specific preselected genes (10 -12). Finally, repositories of mice that bear multiple mutations that alter function in each known gene are gradually being assembled (13-15). These unique resources have the potential to significantly facilitate studies into the pathogenesis of disease in mice. Through the use of the unique genetic reagents that are available in mice (including knockouts and transgenics), the identification of a robust mouse model of DN should significantly facilitate understanding of the underlying genetic mechanisms that contribute to the development of DN in people as well as in mice. Establishment of a valid mouse model of DN should also facilitate testing of translational diagnostic and therapeutic interventions in mice before testing in humans.
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