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Two novel mutations in the aquaporin-2 and the vasopressin V2 receptor genes in patients with congenital nephrogenic diabetes insipidus

Item Type:Article
Title:Two novel mutations in the aquaporin-2 and the vasopressin V2 receptor genes in patients with congenital nephrogenic diabetes insipidus
Creators Name:Oksche, A. and Moeller, A. and Dickson, J. and Rosendahl, W. and Rascher, W. and Bichet, D.G. and Rosenthal, W.
Abstract:The vasopressin V2 receptor (V2R) and the aquaporin-2 genes of two unrelated male patients with congenital nephrogenic diabetes insipidus were analyzed. The V2R gene of the patient of family 1 had the wild-type sequence. Consequently, the coding region of the aquaporin-2 gene including the exon-intron junctions was sequenced. A novel G to T transversion at codon 202, predictive of an exchange of tryptophan 202 by cysteine, was identified. As the mutation occurs at G-1 of the 5' splice donor site of intron 3, aberrant splicing is also likely. The mutation involves one of the supposed water pore-forming loops. Therefore, both aberrant splicing and amino acid substitution are likely to result in a functionally defective protein. Sequencing of the complete V2R gene of the male patient of family 2 revealed a novel single-base deletion at codon 310 (delta C1001), shifting the reading frame to give an altered amino acid sequence beginning at codon 311. The mutation is unique in predicting a C-terminally extended protein (termination after codon 434 in the mutant receptor instead of codon 371 in the wild-type). The deduced mutant protein is likely to be nonfunctional since the amino acid sequence of the seventh transmembrane domain and the C-terminus is altered.
Keywords:Amino Acid Sequence, Aquaporin 2, Aquaporin 6, Aquaporins, DNA Mutational Analysis, Nephrogenic Diabetes Insipidus, Gene Deletion, Infant, Ion Channels, Molecular Models, Molecular Sequence Data, Mutation, Vasopressin Receptors, Restriction Mapping
Source:Human Genetics
ISSN:0340-6717
Publisher:Springer (Germany)
Volume:98
Number:5
Page Range:587-589
Date:November 1996
Official Publication:https://doi.org/10.1007/s004390050264
PubMed:View item in PubMed

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