Journal of Clinical Endocrinology & Metabolism, Vol 81, 1787-1790, Copyright © 1996 by Endocrine Society

ARTICLES

A new type of familial central diabetes insipidus caused by a single base substitution in the neurophysin II coding region of the vasopressin gene

Y Ueta, S Taniguchi, A Yoshida, I Murakami, Y Mitani, I Hisatome, I Manabe, R Sato, M Tsuboi, A Ohtahara, E Nanba and C Shigemasa
The First Department of Internal Medicine, Tottori University Faculty of Medicine, Yonago, Japan.

We studied the genetic basis of familial neurohypophyseal diabetes insipidus in a Japanese family. The members had polyuria and a deficiency of plasma vasopressin (AVP). Polymerase chain reaction (PCR) amplified exons of the AVP-neurophysin-II gene were subcloned and sequenced. Exons 1 and 3 were normal, but nucleotide 1884 Guanine (G) in exon 2 was substituted with Thymine (T), which induced a substitution of glycine (Gly) for valine (Val). To examine the presence of this mutation in the affected subjects, we designed two mutated primers. One of them induced a new endonuclease restriction site in the PCR fragments from normal, and the other induced a new endonuclease restriction site from patients with the mutation. DNA fragments from two affected members of this family were amplified with this primer, and the PCR products were digested by endonuclease and resolved by electrophoresis. The results indicated that these subjects had both normal and mutant alleles, indicating that the mutation was heterozygous. We concluded that this mutation caused neurohypophyseal diabetes insipidus in this family.

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