A case of arginine vasopressin receptor 2 ( AV PR2 ) mutation in a boy with congenital nephrogenic diabetes insipidus was reported.Genomic DNA of the boy and his family members was extracted.The entire coding region of the AVPR2 gene were amplified by PCR.The amplified products were purified and sequenced.The results were compared with the normal one of the gene bank.The impact of the mutation on AVPR2 structure was discussed with respect to homology structure model.The analysis identified a T to G transition in exon 2 of the AVPR2 gene,resulting in substitution of leucine for arginine at amino acid residue 168.Furthermore,the patient′s mother and sister were heterozygous for this mutation,and the father was normol.
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