Open AccessA novel mutation affecting the arginine‐137 residue of AVPR2 in dizygous twins leads to nephrogenic diabetes insipidus and attenuated urine exosome aquaporin‐2
Author(s) -
Hinrichs Gitte R.,
Hansen Louise H.,
Nielsen Maria R.,
Fagerberg Christina,
Dieperink Hans,
Rittig Søren,
Jensen Boye L.
Publication year - 2016
Publication title -
physiological reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 39
ISSN - 2051-817X
DOI - 10.14814/phy2.12764
Subject(s) - nephrogenic diabetes insipidus , aquaporin 2 , medicine , vasopressin , endocrinology , arginine vasopressin receptor 2 , arginine , biology , water channel , genetics , receptor , amino acid , mechanical engineering , antagonist , engineering , inlet
Mutations in the vasopressin V2 receptor gene AVPR 2 may cause X‐linked nephrogenic diabetes insipidus by defective apical insertion of aquaporin‐2 in the renal collecting duct principal cell. Substitution mutations with exchange of arginine at codon 137 can cause nephrogenic syndrome of inappropriate antidiuresis or congenital X‐linked nephrogenic diabetes insipidus. We present a novel mutation in codon 137 within AVPR 2 with substitution of glycine for arginine in male dizygotic twins. Nephrogenic diabetes insipidus was demonstrated by water deprivation test and resistance to vasopressin administration. While a similar urine exosome release rate was shown between probands and controls by western blotting for the marker ALIX , there was a selective decrease in exosome aquaporin‐2 versus aquaporin‐1 protein in probands compared to controls.