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AVP-NPII gene mutations and clinical characteristics of the patients with autosomal dominant familial central diabetes insipidus

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Abstract

Background

Familial central diabetes insipidus (DI), usually an autosomal dominant disorder, is caused by mutations in arginine vasopressin-neurophysin II (AVP-NPII) gene that leads to aberrant preprohormone processing and gradual destruction of AVP-secreting cells.

Objective

To determine clinical and molecular characteristics of patients with familial central DI from two different Turkish families.

Materials and methods

The diagnosis of central DI was established by 24-h urine collection, water deprivation test, and desmopressin challenge. To confirm the diagnosis of familial central DI, the entire coding region of AVP-NPII gene was amplified and sequenced. A total of eight affected patients and three unaffected healthy relatives from two families were studied.

Results

Genetic analysis revealed a previously reported heterozygous mutation (p.C98X) in family A, and a heterozygous novel mutation (p.G45C) in family B, both detected in exon 2 of AVP-NPII gene. When we compared the clinical characteristics of the two families, it was noticed that as the age of onset of symptoms in family A ranges between 4 and 7 years, it was <1 year in family B. Additionally, pituitary bright spot was present in the affected siblings, but absent in their affected parents.

Conclusion

Familial central DI is a progressive disease, and age of onset of symptoms can differ depending on the mutation. Bright spot on pituitary MRI might be present at onset, but become invisible over time. Genetic testing and appropriate counseling should be given in familial cases of central DI to ensure adequate treatment, and to avoid chronic water deprivation that might result in growth retardation in childhood.

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Authors and Affiliations

  1. Department of Pediatric Endocrinology, Antalya Education and Research Hospital, Antalya, Turkey

    Doga Turkkahraman

  2. Department of Biology, Faculty of Science, Hacettepe University, Beytepe, Ankara, Turkey

    Emel Saglar, Tugce Karaduman & Hatice Mergen

Authors
  1. Doga Turkkahraman
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  2. Emel Saglar
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  3. Tugce Karaduman
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  4. Hatice Mergen
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Corresponding author

Correspondence to Doga Turkkahraman.

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Financial support/disclosure

This research was funded by the Scientific and Technological Research Council of Turkey (SBAG Project No: 112S513).

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Authors have no conflict of interest.

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Turkkahraman, D., Saglar, E., Karaduman, T. et al. AVP-NPII gene mutations and clinical characteristics of the patients with autosomal dominant familial central diabetes insipidus. Pituitary 18, 898–904 (2015). https://doi.org/10.1007/s11102-015-0668-z

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