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Analysis of renal tubular electrolyte transporter genes in seven patients with hypokalemic metabolic alkalosis.

Abstract：

BACKGROUND:Disorders that manifest hypokalemic metabolic alkalosis, such as Bartter's syndrome and Gitelman's syndrome, are caused by the malfunction of renal tubular electrolyte transporters. Bartter's syndrome may be linked to dysfunction of Na-K-2Cl cotransporter (NKCC2), renal outer medullary K channel (ROMK), or Cl channel Kb (ClC-Kb), while Gitelman's syndrome may be linked to Na-Cl cotransporter (NCCT) dysfunction. However, previous genetic analyses in these syndromes have included many heterozygotes for each gene and there has been no further analysis of other genes. Thus, to clarify the interaction of these transporter genes, in the present study we investigated all 4 transporter genes in 7 patients with hypokalemic metabolic alkalosis. METHODS:Seven patients from 5 families (patients A-G) were collected, and a mutation analysis of the 4 renal electrolyte transporter genes was performed by direct sequencing. RESULTS:We identified 12 mutations in these 7 patients. Three mutations (del245Y in NKCC2, R1009X in NCCT, V524I in ClC-Kb) have not been reported previously. In NKCC2 gene screening, patient A was homozygous for del245Y. In ClC-Kb gene screening, L27R was detected in patients B, D, and E. V524I was detected in patient C. Both T562M and E578K were observed in patients B and E. In NCCT gene screening, patients B-G shared a common novel mutation, R1009X, and patients D, E, F, and G carried this mutation in both alleles. Patients B and C carried R1009X in one allele, and a 6-amino acid insertion in exon 6 and L849H in another allele, respectively. The 4 other mutations did not result in any amino acid exchange. Despite the NCCT gene mutation, patients C and E showed normomagnesemia. CONCLUSION:Our findings demonstrate that in Bartter's and Gitelman's syndromes, it may not be uncommon to see mutations in several causative transporter genes.

journal_name

Kidney Int

journal_title

Kidney international

authors

Fukuyama S,Okudaira S,Yamazato S,Yamazato M,Ohta T

doi

10.1046/j.1523-1755.2003.00163.x

subject

Has Abstract

pub_date

2003-09-01 00:00:00

pages

808-16

issue

3

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)49401-3

journal_volume

64

pub_type

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