Novel mutations associated with nephrogenic diabetes insipidus. A clinical-genetic study

European Journal of Pediatrics
Alejandro García CastañoRenalTube Group

Abstract

Molecular diagnosis is a useful diagnostic tool in primary nephrogenic diabetes insipidus (NDI), an inherited disease characterized by renal inability to concentrate urine. The AVPR2 and AQP2 genes were screened for mutations in a cohort of 25 patients with clinical diagnosis of NDI. Patients presented with dehydration, polyuria-polydipsia, failure to thrive (mean ± SD; Z-height -1.9 ± 2.1 and Z-weight -2.4 ± 1.7), severe hypernatremia (mean ± SD; Na 150 ± 10 mEq/L), increased plasma osmolality (mean ± SD; 311 ± 18 mOsm/Kg), but normal glomerular filtration rate. Genetic diagnosis revealed that 24 male patients were hemizygous for 17 different putative disease-causing mutations in the AVPR2 gene (each one in a different family). Of those, nine had not been previously reported, and eight were recurrent. Moreover, we found those same AVPR2 changes in 12 relatives who were heterozygous carriers. Further, in one female patient, AVPR2 gene study turned out to be negative and she was found to be homozygous for the novel AQP2 p.Ala86Val alteration. Genetic analysis presumably confirmed the diagnosis of nephrogenic diabetes insipidus in every patient of the studied cohort. We emphasize that we detected a high presence (50 %) of heteroz...Continue Reading

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Citations

Aug 28, 2016·The Journal of International Medical Research·Wei-Hong GuoMei Zhu
Feb 24, 2016·Indian Journal of Endocrinology and Metabolism·Sanjay KalraHarshad Malve
Jul 6, 2020·Journal of Pediatric Endocrinology & Metabolism : JPEM·Bahriye AtmisAli Anarat
Aug 4, 2018·Case Reports in Pediatrics·Noriko Namatame-OhtaToshihiro Tajima

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