A novel mutation affecting the arginine-137 residue of AVPR2 in dizygous twins leads to nephrogenic diabetes insipidus and attenuated urine exosome aquaporin-2.

Abstract

Mutations in the vasopressin V2 receptor gene AVPR2 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 AVPR2 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.

• Authors: Gitte R Hinrichs, Louise H Hansen, Maria R Nielsen, Christina Fagerberg, Hans Dieperink, Søren Rittig, Boye L Jensen
• Journal: Physiological reports (Physiol Rep) Vol. 4 Issue 8 (Apr 2016) ISSN: 2051-817X [Print] United States
• PMID: 27117808 (Publication Type: Case Reports, Journal Article)
• Copyright: © 2016 The Authors. Physiological Reports published by Wiley Periodicals, Inc. on behalf of the American Physiological Society and The Physiological Society.

Chemical References

• AVPR2 protein, human
• Aquaporin 2
• Receptors, Vasopressin
• Arginine

Topics

• Aquaporin 2 (urine)
• Arginine (genetics)
• Blotting, Western
• Diabetes Insipidus, Nephrogenic (genetics)
• Exosomes (metabolism)
• Humans
• Male
• Mutation, Missense (genetics)
• Pedigree
• Point Mutation
• Receptors, Vasopressin (genetics)
• Twins, Dizygotic (genetics)
• Young Adult