Abstract
Familial neurohypophyseal diabetes insipidus (FNDI) is a rare hereditary disorder with unknown prevalence characterized by arginine-vasopressin hormone (AVP) deficiency resulting in polyuria and polydipsia from early childhood. We report the clinical manifestation and genetic test results in seven unrelated kindreds of Czech or Slovak origin with FNDI phenotype. The age of the sign outset ranged from 2 to 17 years with remarkable interfamilial and intrafamilial variability. Inconclusive result of the fluid deprivation test in three children aged 7 and 17 years old might cause misdiagnosis; however, the AVP gene analysis confirmed the FNDI. The seven families segregated together five different mutations, two of them were novel (c.164C > A, c.298G > C). In addition, DNA analysis proved mutation carrier status in one asymptomatic 1-year-old infant.
Conclusions: The present study together with previously published data identified 38 individuals with FNDI in the studied population of 16 million which predicts a disease prevalence of 1:450,000 for the Central European region. The paper underscores that diagnostic water deprivation test may be inconclusive in polyuric children with partial diabetes insipidus and points to the clinical importance and feasibility of molecular genetic testing for AVP gene mutations in the proband and her/his first degree relatives.
What is Known: • At least 70 different mutations were reported to date in about 100 families with neurohypophyseal diabetes insipidus (FNDI), and new mutations appear sporadically. |
What is New: • Two novel mutations of the AVP gene are reported • The importance of molecular testing in children with polyuria and inconclusive water deprivation test is emphasized. |
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Abbreviations
- AVP:
-
arginine vasopressin
- CP:
-
copeptin
- DI:
-
diabetes insipidus
- FNDI:
-
familial neurohypophyseal diabetes insipidus
- MRI:
-
magnetic resonance imaging
- NPII:
-
neurophysin II
- Posm :
-
osmolality of plasma
- SP:
-
signal peptide
- Uosm :
-
osmolality of urine
- WDT:
-
water deprivation test
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Acknowledgments
This work was supported by Ministry of Health of the Slovak Republic under the project registration number 2012/5-UKBA-5, Slovak Research and Development Agency under the project registration number APVV-14-0234, Charles University in Prague under the project registration number PRVOUK P24/LF1/3 and P49/LF1/3 and Ministry of Health of the Czech Republic under the project registration number RVO-VFN 64165/2012.
Contributions
GN, VJ, and LK designed and wrote the manuscript. JK, JZ, VH, JL, DV, and ĽK made the clinical diagnosis and follow-up in described families. GN, JK, VH, and JL recorded the pedigrees. VJ conducted the water deprivation tests during the hospital admission in examined probands. GN, TD, and LK collected the clinical data. MČ and MT made the DNA testing and in silico analyses of the novel variants. All authors reviewed the manuscript. LK reviewed and edited the manuscript. All authors contributed to and have approved the final manuscript. GN and VJ contributed equally and are joint first authors.
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The study involves human participants. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Medical Ethical Committee of the University Children’s Hospital Bratislava, Slovakia has approved the study. Informed consent was obtained from all individual participants who were tested genetically.
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Communicated by Beat Steinmann
Gabriela Hrčková and Viktor Jankó contributed equally.
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Hrčková, G., Jankó, V., Kytnarová, J. et al. Two novel mutations in seven Czech and Slovak kindreds with familial neurohypophyseal diabetes insipidus—benefit of genetic testing. Eur J Pediatr 175, 1199–1207 (2016). https://doi.org/10.1007/s00431-016-2759-x
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DOI: https://doi.org/10.1007/s00431-016-2759-x