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Transcription factors AP-2α and AP-2β have been suggested to regulate the differentiation of nephron precursor populations towards distal nephron segments. Here, we show that in the adult mammalian kidney AP-2α is found in medullary collecting ducts, whereas AP-2β is found in distal nephron segments except for medullary collecting ducts. Inactivation of AP-2α in nephron progenitor cells does not affect mammalian nephrogenesis, whereas its inactivation in collecting ducts leads to defects in medullary collecting ducts in the adult. Heterozygosity for AP-2β in nephron progenitor cells leads to progressive distal convoluted tubule abnormalities and β-catenin/mTOR hyperactivation that is associated with renal fibrosis and cysts. Complete loss of AP-2β in nephron progenitor cells caused an absence of distal convoluted tubules, renal cysts, and fibrosis with β-catenin/mTOR hyperactivation, and early postnatal death. Thus, AP-2α and AP-2β have non-redundant distinct spatiotemporal functions in separate segments of the distal nephron in the mammalian kidney.

Transcription factors AP-2α and AP-2β regulate distinct segments of the distal nephron in the mammalian kidney