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Novel AVPR2 mutations in congenital nephrogenic diabetes insipidus: clinical characteristics and genetic analysis
Kunjiao Xue1,2, Jin Wu1,2, Juanjuan Lyu1,2
1Department of Pediatrics, West China Second Hospital, Sichuan University, Chengdu, China.
Objectives:
Congenital nephrogenic diabetes insipidus (NDI) is a rare hereditary disorder caused by mutations in two critical genes: arginine vasopressin receptor 2 (AVPR2) and aquaporin 2 genes (AQP2). Mutations in AVPR2 gene, which are predominantly X-linked, account for a significant proportion of cases, particularly in men. Nevertheless, research on this condition in the western Chinese population remains limited.
Methods:
Eleven participants from nine families with NDI were screened for AVPR2 mutations. Their clinical features were documented, and genotype-phenotype associations were investigated.
Results:
This study included 11 pediatric patients with congenital NDI, comprising 10 boys and 1 girl. They were diagnosed between 1 month and 7 years of age. The clinical presentations included growth retardation, polydipsia, and polyuria in all patients (11), hypernatremia in 10, renal pelvis dilation in 4, absence of posterior pituitary high signal on magnetic resonance imaging in 3, unexplained fever in 3, and recurrent vomiting in 1 and mental retardation each in 1 patient. Genetic analysis revealed eight AVPR2 mutations among the 11 patients with congenital NDI, 3 of which were novel: p.Ile46Serfs*145, p.Ile177del, and p.Ser327Ilefs*30.
Conclusions:
In the largest case series of congenital NDI caused by AVPR2 mutations in the western Chinese population, eight AVPR2 mutations were identified, including three that were novel. This study enhances the existing literature by elucidating the clinical manifestations of congenital NDI by analyzing 11 cases and by identifying three novel mutation sites, thereby augmenting the genetic understanding of this condition.
Insights
Congenital nephrogenic diabetes insipidus (NDI) is a rare genetic disorder. This study identified eight arginine vasopressin receptor 2 (AVPR2) gene mutations in western Chinese patients, including three novel mutations.
Area of Science:
- Genetics
- Pediatrics
- Endocrinology
Background:
- Congenital nephrogenic diabetes insipidus (NDI) is a rare hereditary disorder.
- It is primarily caused by mutations in the arginine vasopressin receptor 2 (AVPR2) gene.
- Research on NDI in the western Chinese population is limited.
Purpose of the Study:
- To investigate AVPR2 gene mutations in patients with congenital NDI in western China.
- To document clinical features and explore genotype-phenotype associations.
Main Methods:
- Genetic screening of 11 participants from nine families with NDI for AVPR2 mutations.
- Documentation of clinical features and genotype-phenotype correlation analysis.
Main Results:
- Eleven pediatric patients (10 boys, 1 girl) with congenital NDI were studied.
- Eight AVPR2 mutations were identified, including three novel mutations (p.Ile46Serfs*145, p.Ile177del, and p.Ser327Ilefs*30).
- Clinical presentations included growth retardation, polydipsia, polyuria, and hypernatremia.
Conclusions:
- This study represents the largest case series of AVPR2-mutation-caused NDI in western China.
- It expands the understanding of congenital NDI by identifying novel mutations and detailing clinical manifestations.
- The findings contribute to the genetic knowledge of NDI in this population.
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