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Novel AQP2 Mutations and Clinical Characteristics in Seven Chinese Families With Congenital Nephrogenic Diabetes Insipidus

Authors
  • Li, Qian1
  • Tian, Dan2
  • Cen, Jing3
  • Duan, Lian1
  • Xia, Weibo1
  • 1 Department of Endocrinology, Key Laboratory of Endocrinology, NHC, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing , (China)
  • 2 Department of Nuclear Medicine, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou , (China)
  • 3 Department of Medical Cell Biology, Uppsala University, Uppsala , (Sweden)
Type
Published Article
Journal
Frontiers in Endocrinology
Publisher
Frontiers Media SA
Publication Date
Jun 10, 2021
Volume
12
Identifiers
DOI: 10.3389/fendo.2021.686818
Source
Frontiers
Keywords
Disciplines
  • Endocrinology
  • Original Research
License
Green

Abstract

Objective Mutations in AQP2 (aquaporin-2) lead to rare congenital nephrogenic diabetes insipidus (NDI), which has been limitedly studied in Chinese population. Methods Twenty-five subjects from seven families with NDI in a department (Beijing, PUMCH) were screened for AQP2 mutations. Clinical characteristics were described and genotype-phenotype correlation analysis was performed. Results We identified 9 AQP2 mutations in 13 patients with NDI, including 3 novel AQP2 mutations (p.G165D, p.Q255RfsTer72 and IVS3-3delC). Missense mutations were the most common mutation type, followed by splicing mutations, and frameshift mutations caused by small deletion or insertion. The onset-age in our patients was younger than 1 year old. Common manifestations included polydipsia, polyuria (7/7) and intermittent fever (6/7). Less common presentations included short stature (3/7) and mental impairment (1/7). High osmotic hypernatremia and low osmotic urine were the main biochemical features. Dilation of the urinary tract was a common complication of NDI (3/6). Level of serum sodium in NDI patients with compound het AQP2 mutations was higher than non-compound het mutations. Conclusion In the first and largest case series of NDI caused by AQP2 mutation in Chinese population, we identified 9 AQP2 mutations, including 3 novel mutations. Phenotype was found to correlate with genotypes, revealed by higher level of serum sodium in patients with compound het AQP2 mutations than non-compound het mutations. This knowledge broadens genotypic and phenotypic spectrum for rare congenital NDI and provided basis for studying molecular biology of AQP2.

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