Phenotype and genotype of Dent's disease in three Korean boys.
Dent's disease is a hereditary renal tubular disorder caused by mutations of the CLCN5 gene and is clinically characterized by low molecular weight proteinuria, hypercalciuria and nephrocalcinosis. This disease has been reported in several countries. However, there are some phenotypic differences between countries, such as hypophosphatemic rickets, progressive renal failure and hematuria. In this study, phenotypes were analyzed in three Korean boys with Dent's disease, and genetic diagnoses were performed using a new convenient method using peripheral blood RNA. Gene studies revealed two nonsense mutations, R637X in two patients and E609X in one patient. The phenotypes of the two patients with R637X were very similar to those of Japanese patients, i.e., they presented with asymptomatic proteinuria without rickets, renal failure or hematuria. The E609X patient was diagnosed genetically at 3 months of age before the onset of clinical symptoms because of superimposed furosemide-induced nephrolithiasis. This is the first report to characterize mutations in the CLCN5 gene in Korean patients with Dent's disease, and expands the spectrum of CLCN5 mutations by reporting a novel mutation, E609X. In addition, the mutational analysis using peripheral blood RNA can be easily applied in the clinical diagnosis.
Cheong
Hae Il
HI
Department of Pediatrics, Seoul National University Children's Hospital, 28 Yongon-dong Chongro-gu, 110-744 Seoul, Korea. cheonghi@plaza.snu.ac.kr
Lee
Jung Won
JW
Zheng
Shou Huan
SH
Lee
Joo Hoon
JH
Kang
Ju Hyung
JH
Kang
Hee Gyung
HG
Ha
Il Soo
IS
Lee
Seung Joo
SJ
Choi
Yong
Y
D001120:Arginine; D044466:Asian People / Q000235:genetics*; D002648:Child; D002675:Child, Preschool; D018118:Chloride Channels / Q000235:genetics*; D018389:Codon, Nonsense; D004232:Diuretics / Q000009:adverse effects / Q000627:therapeutic use; D005665:Furosemide / Q000009:adverse effects / Q000627:therapeutic use; D005838:Genotype; D018698:Glutamic Acid; D006333:Heart Failure / Q000188:drug therapy; D006801:Humans; D007223:Infant; D007669:Kidney Calculi / Q000139:chemically induced / Q000150:complications / Q000000981:diagnostic imaging; D007674:Kidney Diseases / Q000150:complications / Q000000981:diagnostic imaging / Q000235:genetics*; D007684:Kidney Tubules; D008297:Male; D010641:Phenotype; D012694:Serine; D014463:Ultrasonography
C097503:CLC-5 chloride channel; D018118:Chloride Channels; D018389:Codon, Nonsense; D004232:Diuretics; D018698:Glutamic Acid; D012694:Serine; D005665:Furosemide; D001120:Arginine
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