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Single amino acid substitution in aquaporin 11 causes renal failure.


ABSTRACT: A screen of recessive mutations generated by the chemical mutagen n-ethyl-n-nitrosourea (ENU) mapped a new mutant locus (5772SB) termed sudden juvenile death syndrome (sjds) to chromosome 7 in mice. These mutant mice, which exhibit severe proximal tubule injury and formation of giant vacuoles in the renal cortex, die from renal failure, a phenotype that resembles aquaporin 11 (Aqp11) knockout mice. In this report, the ENU-induced single-nucleotide variant (sjds mutation) is identified. To determine whether this variant, which causes an amino acid substitution (Cys227Ser) in the predicted E-loop region of aquaporin 11, is responsible for the sjds lethal renal phenotype, Aqp11-/sjds compound heterozygous mice were generated from Aqp11 +/sjds and Aqp11 +/- intercrosses. The compound heterozygous Aqp11 -/sjds offspring exhibited a lethal renal phenotype (renal failure by 2 wk), similar to the Aqp11 sjds/sjds and Aqp11-/- phenotypes. These results demonstrate that the identified mutation causes renal failure in Aqp11 sjds/sjds mutant mice, providing a model for better understanding of the structure and function of aquaporin 11 in renal physiology.

SUBMITTER: Tchekneva EE 

PROVIDER: S-EPMC2551576 | biostudies-literature | 2008 Oct

REPOSITORIES: biostudies-literature

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Single amino acid substitution in aquaporin 11 causes renal failure.

Tchekneva Elena E EE   Khuchua Zaza Z   Davis Linda S LS   Kadkina Veronika V   Dunn Stephen R SR   Bachman Sebastian S   Ishibashi Kenichi K   Rinchik Eugene M EM   Harris Raymond C RC   Dikov Mikhail M MM   Breyer Matthew D MD  

Journal of the American Society of Nephrology : JASN 20080813 10


A screen of recessive mutations generated by the chemical mutagen n-ethyl-n-nitrosourea (ENU) mapped a new mutant locus (5772SB) termed sudden juvenile death syndrome (sjds) to chromosome 7 in mice. These mutant mice, which exhibit severe proximal tubule injury and formation of giant vacuoles in the renal cortex, die from renal failure, a phenotype that resembles aquaporin 11 (Aqp11) knockout mice. In this report, the ENU-induced single-nucleotide variant (sjds mutation) is identified. To determ  ...[more]

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