A Novel AVP Gene Mutation in a Turkish Family with Neurohypophyseal Diabetes Insipidus

Overview

Journal J Endocrinol Invest

Publisher Springer

Specialty Endocrinology

Date 2015 Jul 26

PMID 26208472

Citations 3

Authors

M Ilhan

N O Tiryakioglu

O Karaman

E Coskunpinar

R S Yildiz

S Turgut

D Tiryakioglu

H Toprak

E Tasan

Affiliations

Soon will be listed here.

Abstract

Purpose: Familial neurohypophyseal diabetes insipidus (FNDI) is a rare, autosomal dominant, inherited disorder which is characterized by severe polydipsia and polyuria generally presenting in early childhood. In the present study, we aimed to analyze the AVP gene in a Turkish family with FNDI.

Methods: Four patients with neurohypophyseal diabetes insipidus and ten healthy members of the family were studied. Diabetes insipidus was diagnosed by the water deprivation test in affected family members. Mutation analysis was performed by sequencing the whole coding region of AVP-NPII gene using DNA isolated from peripheral blood samples.

Results: Urine osmolality was low (<300 mOsm/kg) during water deprivation test, and an increase more than 50 % in urine osmolality and recovery of the symptoms were observed by the administration of desmopressin in all patients. Plasma copeptin levels were lower than expected according to plasma osmolality. Pituitary MRI revealed partial empty sella with a bright spot in index patient and a normal neurohypophysis in the other affected subjects. Genetic screening revealed a novel, heterozygous mutation designated as c.-3A>C in all patients.

Conclusion: c.-3A>C mutation in 5'UTR of AVP gene in this family might lead to the truncation of signal peptide, aggregation of AVP in the cytoplasm instead of targeting in the endoplasmic reticulum, thereby could disrupt AVP secretion without causing neuronal cytotoxicity, which might explain the presence of bright spot. The predicted effect of this mutation should be investigated by further in vitro molecular studies.

Citing Articles

Central diabetes insipidus.

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Brain Formaldehyde is Related to Water Intake behavior.

Li T, Su T, He Y, Lu J, Mo W, Wei Y Aging Dis. 2016; 7(5):561-584.

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Two novel mutations in seven Czech and Slovak kindreds with familial neurohypophyseal diabetes insipidus-benefit of genetic testing.

Hrckova G, Janko V, Kytnarova J, cizmarova M, Tesarova M, Kostalova L Eur J Pediatr. 2016; 175(9):1199-1207.

PMID: 27539621 DOI: 10.1007/s00431-016-2759-x.

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