Aigner B, Rathkolb B, Herbach N, Hrabé de Angelis MH, Wanke R, Wolf E. Diabetes models by screen for hyperglycemia in phenotype-driven ENU mouse mutagenesis projects. Am J Physiol Endocrinol Metab 294: E232-E240, 2008. First published December 4, 2007 doi:10.1152/ajpendo.00592.2007.-More than 150 million people suffer from diabetes mellitus worldwide, and this number is expected to rise substantially within the next decades. Despite its high prevalence, the pathogenesis of diabetes mellitus is not completely understood. Therefore, appropriate experimental models are essential tools to gain more insight into the genetics and pathogenesis of the disease. Here, we describe the current efforts to establish novel diabetes models derived from unbiased, phenotype-driven, large-scale N-ethyl-N-nitrosourea (ENU) mouse mutagenesis projects started a decade ago using hyperglycemia as a high-throughput screen parameter. Mouse lines were established according to their hyperglycemia phenotype over several generations, thereby revealing a mutation as cause for the aberrant phenotype. Chromosomal assignment of the causative mutation and subsequent candidate gene analysis led to the detection of the mutations that resulted in novel alleles of genes already known to be involved in glucose homeostasis, like glucokinase, insulin 2, and insulin receptor. Additional ENU-induced hyperglycemia lines are under genetic analysis. Improvements in screen for diabetic animals are implemented to detect more subtle phenotypes. Moreover, diet challenge assays are being employed to uncover interactions between genetic and environmental factors in the pathogenesis of diabetes mellitus. The new mouse mutants recovered in phenotype-driven ENU mouse mutagenesis projects complement the available models generated by targeted mutagenesis of candidate genes, all together providing the large resource of models required for a systematic dissection of the pathogenesis of diabetes mellitus. clinical chemistry; N-ethyl-N-nitrosourea; glucose; insulin TYPE 2 DIABETES MELLITUS (T2DM) is characterized by uncontrolled hyperglycemia caused by both insulin resistance and pancreatic -cell dysfunction. Human T2DM is usually a polyfactorial disease resulting from the interaction of genetic susceptibility and environmental factors. The prevalence of diabetes mellitus has reached an alarming dimension in industrialized countries and is expected to rise substantially within the next decades. Diabetes leads to a reduced quality of life and life expectancy by causing increased risk for blindness, cardiovascular disease, nephropathy, and neuropathy (53). Despite its high prevalence, the pathogenesis of diabetes mellitus is not completely understood. Diabetic mouse mutants are used to identify genes and pathways that regulate glucose homeostasis, contribute to the susceptibility to diabetes, and affect the development and severity of secondary complications. Thus, these models are important to gain insights into all aspects of the pathophysiology of diabetes and also for ...