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Identification of Mutations of the Arginine Vasopressin-Neurophysin II Gene in Two Kindreds with Familial Central Diabetes Insipidus

Klinik II und Poliklinik für Innere Medizin der Universität zu Köln, Cologne, Germany

Address all correspondence and requests for reprints to: Dirk Müller-Wieland, M.D., Klinik II und Poliklinik für Innere Medizin der Universität zu Köln, 50924 Koln, Germany.

Familial central diabetes insipidus is transmitted as an autosomal dominant trait with almost complete penetrance. Twenty-three different mutations of the arginine vasopressin-neurophysin II gene have been reported to date, located within the signal peptide-, the arginine vasopressin-, or the neurophysin II-coding region. In the present study two kindreds with familial central diabetes insipidus were examined. The entire coding region of the arginine vasopressin-neurophysin II gene of one affected subject of each family was amplified by PCR and subcloned into a pUC 18 plasmid, and six positive clones were sequenced. After identification of the mutation, direct sequencing was performed on the respective sequence of family members and 28 healthy control subjects. In family A, a missense mutation (CT) at nucleotide position 280 was detected, predicting the substitution of alanine by valine at position -1 of the signal peptide. All affected subjects were heterozygote for the mutation, whereas none of the unaffected family members or control subjects displayed the mutant sequence. In family B, a missense mutation within the neurophysin II-coding sequence was identified (nucleotide 1757, GC), predicting the substitution of glycine by arginine at position 23. Again, affected family members were found to be heterozygote for the mutation, which was not observed in unaffected family members or in control subjects. Although the mutation of family A was recently described in 3 other kindreds as well, the mutation within the neurophysin II-coding region represents a novel mutation of the AVP-NP II gene.

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