Heterogeneous AVPR2 gene mutations in congenital nephrogenic diabetes insipidus
| Autor: | Wildin, R. S., Antush, M. J., Bennett, R. L., Schoof, J. M., Scott, C. R. |
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| Jazyk: | angličtina |
| Rok vydání: | 1994 |
| Předmět: |
Male
Receptors Vasopressin X Chromosome Base Sequence DNA Mutational Analysis Molecular Sequence Data Infant Newborn Infant Polymerase Chain Reaction Pedigree Arginine Vasopressin Structure-Activity Relationship Mutation Humans Point Mutation Electrophoresis Polyacrylamide Gel Kidney Diseases Crossing Over Genetic Deoxyribonucleases Type II Site-Specific Frameshift Mutation Oligonucleotide Probes Diabetes Insipidus Polymorphism Restriction Fragment Length Research Article Sequence Deletion |
| Popis: | Mutations in the AVPR2 gene encoding the receptor for arginine vasopressin in the kidney (V2 ADHR) have been reported in patients with congenital nephrogenic diabetes insipidus, a predominantly X-linked disorder of water homeostasis. We have used restriction-enzyme analysis and direct DNA sequencing of genomic PCR product to evaluate the AVPR2 gene in 11 unrelated affected males. Each patient has a different DNA sequence variation, and only one matches a previously reported mutation. Cosegregation of the variations with nephrogenic diabetes insipidus was demonstrated for two families, and a de novo mutation was documented in two additional cases. Carrier detection was accomplished in one family. All the variations predict frameshifts, truncations, or nonconservative amino acid substitutions in evolutionarily conserved positions in the V2 ADHR and related receptors. Of interest, a 28-bp deletion is found in one patient, while another, unrelated patient has a tandem duplication of the same 28-bp segment, suggesting that both resulted from the same unusual unequal crossing-over mechanism facilitated by 9-mer direct sequence repeats. Since the V2 ADHR is a member of the seven-transmembrane-domain, G-protein-coupled receptor superfamily, the loss-of-function mutations from this study and others provide important clues to the structure-function relationship of this and related receptors. |
| Databáze: | OpenAIRE |
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