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The homeobox domain transcription factor PDX-1 is essential for pancreatic development and for the maintenance of beta-cell function. The participation of pancreatic duodenal homeobox factor-1 (PDX-1) in the transcription of several genes which are essential for glucose sensing and insulin synthesis underlines its key role in beta-cells of the pancreas. PDX-1 binds to the promoter of insulin, glucose transporter 2, and glucokinase and regulates their expression. By protein-protein interaction, PDX-1 acts in concert with other transcription factors or coactivators at the level of the insulin promoter. Ectopic expression of PDX-1 together with other cofactors can re-program cells to behave like beta-cells and produce insulin. This property of PDX-1 opens new strategies for the treatment of diabetes. Little is known about its regulation at the posttranslational level. Here, we report on its DNA-binding activity, the nuclear import and on post-translational modifications such as phosphorylation, glycosylation and sumoylation. Modulation of these post-translational modifications may be an alternate strategy for treating diabetes.

Pancreatic duodenal homeobox factor-1and diabetes mellitus type 2 (Review)