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New mutations in the AQP2 gene in nephrogenic diabetes insipidus resulting in functional but misrouted water channels.

S M Mulders, N V Knoers, A F Van Lieburg, L A Monnens, E Leumann, E Wühl, E Schober, J P Rijss, C H Van Os and P M Deen
JASN February 1997, 8 (2) 242-248; DOI: https://doi.org/10.1681/ASN.V82242
S M Mulders
Department of Cell Physiology, University of Nijmegen, The Netherlands.
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N V Knoers
Department of Cell Physiology, University of Nijmegen, The Netherlands.
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A F Van Lieburg
Department of Cell Physiology, University of Nijmegen, The Netherlands.
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L A Monnens
Department of Cell Physiology, University of Nijmegen, The Netherlands.
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E Leumann
Department of Cell Physiology, University of Nijmegen, The Netherlands.
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E Wühl
Department of Cell Physiology, University of Nijmegen, The Netherlands.
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E Schober
Department of Cell Physiology, University of Nijmegen, The Netherlands.
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J P Rijss
Department of Cell Physiology, University of Nijmegen, The Netherlands.
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C H Van Os
Department of Cell Physiology, University of Nijmegen, The Netherlands.
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P M Deen
Department of Cell Physiology, University of Nijmegen, The Netherlands.
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Abstract

Nephrogenic diabetes insipidus (NDI) is characterized by the inability of the kidney to concentrate urine in response to vasopressin. The autosomal recessive form of NDI is caused by mutations in the AQP2 gene, encoding the vasopressin-regulated water channel of the kidney collecting duct. This report presents three new mutations in the AQP2 gene that cause NDI, resulting in A147T-, T126M-, or N68S-substituted AQP2 proteins. Expression of the A147T and T126M mutant AQP2 proteins in Xenopus oocytes revealed a relatively small, but significant increase in water permeability, whereas the water permeability of N68S expressing oocytes was not increased. cRNA encoding missense and wild-type AQP2 were equally stable in oocytes. Immunoblots of oocyte lysates showed that only the A147T mutant protein was less stable than wild-type AQP2. The mutant AQP2 proteins showed, in addition to the wild-type 29-kd band, an endoplasmic reticulum-retarded form of AQP2 of approximately 32 kd. Immunoblotting and immunocytochemistry demonstrated only intense labeling of the plasma membranes of oocytes expressing wild-type AQP2. In summary, two mutant AQP2 proteins encoded in NDI are functional water channels. Therefore, the major cause underlying autosomal recessive NDI is the misrouting of AQP2 mutant proteins.

  • Copyright © 1997 by American Society of Nephrology
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Journal of the American Society of Nephrology
Vol. 8, Issue 2
1 Feb 1997
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New mutations in the AQP2 gene in nephrogenic diabetes insipidus resulting in functional but misrouted water channels.
S M Mulders, N V Knoers, A F Van Lieburg, L A Monnens, E Leumann, E Wühl, E Schober, J P Rijss, C H Van Os, P M Deen
JASN Feb 1997, 8 (2) 242-248; DOI: 10.1681/ASN.V82242

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New mutations in the AQP2 gene in nephrogenic diabetes insipidus resulting in functional but misrouted water channels.
S M Mulders, N V Knoers, A F Van Lieburg, L A Monnens, E Leumann, E Wühl, E Schober, J P Rijss, C H Van Os, P M Deen
JASN Feb 1997, 8 (2) 242-248; DOI: 10.1681/ASN.V82242
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