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• W2166813685 abstract "Vasopressin regulates water homeostasis through insertion of homotetrameric aquaporin-2 (AQP2) water channels in the apical plasma membrane of renal cells. AQP2 mutations cause recessive and dominant nephrogenic diabetes insipidus (NDI), a disease in which the kidney is unable to concentrate urine in response to vasopressin. Until now, all AQP2 mutants in recessive NDI were shown to be misfolded, retained in the endoplasmic reticulum (ER) and unable to interact with wild-type (wt)-AQP2, whereas AQP2 mutants in dominant NDI are properly folded and interact with wt-AQP2, but, due to the mutation, cause missorting of the wt-AQP2/mutant complex. Here, patients of two families with recessive NDI appeared compound heterozygotes for AQP2-A190T or AQP2-R187C mutants, together with AQP2-P262L. As mutations in the AQP2 C-tail, where P262 resides, usually cause dominant NDI, the underlying cell-biological mechanism was investigated. Upon expression in oocytes, AQP2-P262L was a properly folded and functional aquaporin in contrast to the classical mutants, AQP2-R187C and AQP2-A190T. Expressed in polarized cells, AQP2-P262L was retained in intracellular vesicles and did not localize to the ER. Upon co-expression, however, AQP2-P262L interacted with wt-AQP2, but not with AQP2-R187C, resulting in a rescued apical membrane expression of AQP2-P262L. In conclusion, our study reveals a novel cellular phenotype in recessive NDI in that AQP2-P262L acts as a mutant in dominant NDI, except for that its missorting is overruled by apical sorting of wt-AQP2. Also, it demonstrates for the first time that the recessive inheritance of a disease involving a channel can be due to two cell-biological mechanisms." @default.
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• W2166813685 date "2004-12-15" @default.
• W2166813685 modified "2023-10-12" @default.
• W2166813685 title "A novel mechanism in recessive nephrogenic diabetes insipidus: wild-type aquaporin-2 rescues the apical membrane expression of intracellularly retained AQP2-P262L" @default.
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• W2166813685 doi "https://doi.org/10.1093/hmg/ddh339" @default.
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