OBJECTIVE: To describe a Thai girl with congenital nephrogenic diabetes insipidus (NDI) and perform mutation analysis of the AQP2 gene. DESIGN: Case report. PATIENT: A 6-year old girl with a history of failure to thrive, polydipsia and polyuria was studied. Polyuria and polydipsia were observed within the first few months of life. Despite normal serum osmolality and electrolyte, the result of water deprivation test was compatible with a diagnosis of NDI. METHODS: The entire coding regions of the AQP2 gene were assessed by polymerase chain reaction and sequencing analysis. The presence of mutations was also confirmed by restriction enzyme digestion analysis. RESULTS: Two heterozygous novel missense mutations were identified. Both were located in exon 1; a guanine-to-thymine substitution at nucleotide position 3 (c.3G-->T) inherited from her mother and a guanine-to-adenine at position 85 (c.85G-->A) inherited from her father, resulting in a methionine to isoleucine at codon 1 (p.M1I) and glycine to serine at codon 29 (p.G29S), respectively. These mutations have never been previously described and were not detected in 100 ethnic-matched unaffected control chromosomes. CONCLUSION: We report two novel mutations of the AQP2 gene, p.M1I and p.G29S, associated with autosomal recessive congenital NDI. This study expands the genotypic spectrum of AQP2 mutations and emphasizes an important role of genetic testing for definite diagnosis and genetic counseling.
OBJECTIVE: To describe a Thai girl with congenital nephrogenic diabetes insipidus (NDI) and perform mutation analysis of the AQP2 gene. DESIGN: Case report. PATIENT: A 6-year old girl with a history of failure to thrive, polydipsia and polyuria was studied. Polyuria and polydipsia were observed within the first few months of life. Despite normal serum osmolality and electrolyte, the result of water deprivation test was compatible with a diagnosis of NDI. METHODS: The entire coding regions of the AQP2 gene were assessed by polymerase chain reaction and sequencing analysis. The presence of mutations was also confirmed by restriction enzyme digestion analysis. RESULTS: Two heterozygous novel missense mutations were identified. Both were located in exon 1; a guanine-to-thymine substitution at nucleotide position 3 (c.3G-->T) inherited from her mother and a guanine-to-adenine at position 85 (c.85G-->A) inherited from her father, resulting in a methionine to isoleucine at codon 1 (p.M1I) and glycine to serine at codon 29 (p.G29S), respectively. These mutations have never been previously described and were not detected in 100 ethnic-matched unaffected control chromosomes. CONCLUSION: We report two novel mutations of the AQP2 gene, p.M1I and p.G29S, associated with autosomal recessive congenital NDI. This study expands the genotypic spectrum of AQP2 mutations and emphasizes an important role of genetic testing for definite diagnosis and genetic counseling.
Authors: M Kuwahara; K Iwai; T Ooeda; T Igarashi; E Ogawa; Y Katsushima; I Shinbo; S Uchida; Y Terada; M F Arthus; M Lonergan; T M Fujiwara; D G Bichet; F Marumo; S Sasaki Journal: Am J Hum Genet Date: 2001-08-30 Impact factor: 11.025
Authors: Nannette Marr; Daniel G Bichet; Michele Lonergan; Marie-Francoise Arthus; Nikola Jeck; Hannsjörg W Seyberth; Walter Rosenthal; Carel H van Os; Alexander Oksche; Peter M T Deen Journal: Hum Mol Genet Date: 2002-04-01 Impact factor: 6.150
Authors: Fabrizio de Mattia; Paul J M Savelkoul; Erik-Jan Kamsteeg; Irene B M Konings; Peter van der Sluijs; Rudolf Mallmann; Alexander Oksche; Peter M T Deen Journal: J Am Soc Nephrol Date: 2005-08-24 Impact factor: 10.121
Authors: S M Mulders; D G Bichet; J P Rijss; E J Kamsteeg; M F Arthus; M Lonergan; M Fujiwara; K Morgan; R Leijendekker; P van der Sluijs; C H van Os; P M Deen Journal: J Clin Invest Date: 1998-07-01 Impact factor: 14.808
Authors: Nannette Marr; Daniel G Bichet; Susan Hoefs; Paul J M Savelkoul; Irene B M Konings; Fabrizio De Mattia; Michael P J Graat; Marie-Françoise Arthus; Michele Lonergan; T Mary Fujiwara; Nine V A M Knoers; Daniel Landau; William J Balfe; Alexander Oksche; Walter Rosenthal; Dominik Müller; Carel H Van Os; Peter M T Deen Journal: J Am Soc Nephrol Date: 2002-09 Impact factor: 10.121