RGD Reference Report - Congenital progressive hydronephrosis (cph) is caused by an S256L mutation in aquaporin-2 that affects its phosphorylation and apical membrane accumulation.

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Congenital progressive hydronephrosis (cph) is caused by an S256L mutation in aquaporin-2 that affects its phosphorylation and apical membrane accumulation.
Authors:	McDill, BW Li, SZ Kovach, PA Ding, L Chen, F
Citation:	McDill BW, etal., Proc Natl Acad Sci U S A. 2006 May 2;103(18):6952-7. Epub 2006 Apr 25.
RGD ID:	2314310
Pubmed:	PMID:16641094 (View Abstract at PubMed)
PMCID:	PMC1459000 (View Article at PubMed Central)
DOI:	DOI:10.1073/pnas.0602087103 (Journal Full-text)
Congenital progressive hydronephrosis (cph) is a spontaneous recessive mutation that causes severe hydronephrosis and obstructive nephropathy in affected mice. The mutation has been mapped to the distal end of mouse chromosome 15, but the mutated gene has not been found. Here, we describe the identification of a single base pair change in aquaporin-2 (Aqp2) in cph mutants through genetic linkage mapping. The C-T change led to the substitution of a Ser (S256) by a Leu in the cytoplasmic tail of the Aqp2 protein, preventing its phosphorylation at S256 and the subsequent accumulation of Aqp2 on the apical membrane of the collecting duct principal cells. The interference with normal trafficking of Aqp2 by this mutation resulted in a severe urine concentration defect. cph homozygotes demonstrated polydipsia and produced a copious amount of hypotonic urine. The urine concentration defect could not be corrected by [deamino-Cys1,D-Arg8]-vasopressin (DDAVP, a vasopressin analog), characteristic of nephrogenic diabetes insipidus. The nephrogenic diabetes insipidus symptoms and the absence of developmental defects in the pyeloureteral peristaltic machinery in the mutants before the onset of hydronephrosis suggest that the congenital obstructive nephropathy is most likely a result of the polyuria. This study has revealed the genetic basis for the classical cph mutation and has provided direct genetic evidence that S256 in Aqp2 is indispensable for the apical accumulation, but not the general glycosylation or membrane association, of Aqp2.

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Term	Qualifier	Evidence	With	Reference	Notes	Source	Original Reference(s)
hydronephrosis		ISO	Aqp2 (Mus musculus)	2314310; 2314310	DNA:mutation:exon:g.767C>T(mouse)	RGD
hydronephrosis		IAGP		2314310	DNA:mutation:exon:g.767C>T(mouse)	RGD
hydronephrosis		IDA		2314310	protein:decreased phosphorylation and altered localization:kidney:p.S256L	RGD

Objects Annotated

Genes (Rattus norvegicus)

Aqp2 (aquaporin 2)

Genes (Mus musculus)

Aqp2 (aquaporin 2)

Genes (Homo sapiens)

AQP2 (aquaporin 2)

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Congenital progressive hydronephrosis (cph) is caused by an S256L mutation in aquaporin-2 that affects its phosphorylation and apical membrane accumulation.