Abstract
X-linked nephrogenic diabetes insipidus (NDI) is a rare inherited disorder caused by mutations in the arginine vasopressin receptor 2 (V2R) gene. The clinical phenotype is fully expressed in hemizygous male patients and is usually asymptomatic in heterozygous females. In the present study, a 51-yr-old Japanese female with congenital NDI and her family members were examined. The patient developed severe hypernatremia accompanied by hypoosmotic polyuria after gynecological surgery, and was unable to concentrate urinary osmolality in response to exogenous vasopressin. Direct sequencing analysis of the propositus and her two affected sons revealed a two-nucleotide deletion change at codon 30 (g.452–453delAC) in the V2R gene, resulting in a frameshift and premature termination in translation at codon 190. The X chromosome inactivation pattern was investigated in the propositus using methylation analysis of the polymorphic CAG repeat in the androgen receptor gene, and the value for relative X chromosome inactivation of one allele was 70.2%. In conclusion, we identified a novel V2R gene mutation in a female patient and her sons with congenital NDI, and her phenotype may be caused by skewed X chromosome inactivation.
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Kinoshita, K., Miura, Y., Nagasaki, H. et al. A novel deletion mutation in the arginine vasopressin receptor 2 gene and skewed X chromosome inactivation in a female patient with congenital nephrogenic diabetes insipidus. J Endocrinol Invest 27, 167–170 (2004). https://doi.org/10.1007/BF03346263
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DOI: https://doi.org/10.1007/BF03346263