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Research Article Free access | 10.1172/JCI119694

Familial distal renal tubular acidosis is associated with mutations in the red cell anion exchanger (Band 3, AE1) gene.

L J Bruce, D L Cope, G K Jones, A E Schofield, M Burley, S Povey, R J Unwin, O Wrong, and M J Tanner

Department of Biochemistry, School of Medical Sciences, University of Bristol, United Kingdom.

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Department of Biochemistry, School of Medical Sciences, University of Bristol, United Kingdom.

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Department of Biochemistry, School of Medical Sciences, University of Bristol, United Kingdom.

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Department of Biochemistry, School of Medical Sciences, University of Bristol, United Kingdom.

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Department of Biochemistry, School of Medical Sciences, University of Bristol, United Kingdom.

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Department of Biochemistry, School of Medical Sciences, University of Bristol, United Kingdom.

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Department of Biochemistry, School of Medical Sciences, University of Bristol, United Kingdom.

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Department of Biochemistry, School of Medical Sciences, University of Bristol, United Kingdom.

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Department of Biochemistry, School of Medical Sciences, University of Bristol, United Kingdom.

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Published October 1, 1997 - More info

Published in Volume 100, Issue 7 on October 1, 1997
J Clin Invest. 1997;100(7):1693–1707. https://doi.org/10.1172/JCI119694.
© 1997 The American Society for Clinical Investigation
Published October 1, 1997 - Version history
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Abstract

All affected patients in four families with autosomal dominant familial renal tubular acidosis (dRTA) were heterozygous for mutations in their red cell HCO3-/Cl- exchanger, band 3 (AE1, SLC4A1) genes, and these mutations were not found in any of the nine normal family members studied. The mutation Arg589--> His was present in two families, while Arg589--> Cys and Ser613--> Phe changes were found in the other families. Linkage studies confirmed the co-segregation of the disease with a genetic marker close to AE1. The affected individuals with the Arg589 mutations had reduced red cell sulfate transport and altered glycosylation of the red cell band 3 N-glycan chain. The red cells of individuals with the Ser613--> Phe mutation had markedly increased red cell sulfate transport but almost normal red cell iodide transport. The erythroid and kidney isoforms of the mutant band 3 proteins were expressed in Xenopus oocytes and all showed significant chloride transport activity. We conclude that dominantly inherited dRTA is associated with mutations in band 3; but both the disease and its autosomal dominant inheritance are not related simply to the anion transport activity of the mutant proteins.

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