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Monovalent cation leaks in human red cells caused by single amino-acid substitutions in the transport domain of the band 3 chloride-bicarbonate exchanger, AE1

Abstract

We identified 11 human pedigrees with dominantly inherited hemolytic anemias in both the hereditary stomatocytosis and spherocytosis classes. Affected individuals in these families had an increase in membrane permeability to Na and K that is particularly marked at 0 °C. We found that disease in these pedigrees was associated with a series of single amino-acid substitutions in the intramembrane domain of the erythrocyte band 3 anion exchanger, AE1. Anion movements were reduced in the abnormal red cells. The 'leak' cation fluxes were inhibited by SITS, dipyridamole and NS1652, chemically diverse inhibitors of band 3. Expression of the mutated genes in Xenopus laevis oocytes induced abnormal Na and K fluxes in the oocytes, and the induced Cl transport was low. These data are consistent with the suggestion that the substitutions convert the protein from an anion exchanger into an unregulated cation channel.

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Figure 1: Temperature dependence of leak cation flux in different individuals.
Figure 2: Effect of band 3 inhibitors on cation leaks in different pedigrees.
Figure 3: Anion transport in normal and abnormal cells.
Figure 4: Heterologous expression in X. laevis oocytes.
Figure 5: Assessment of expression of mutant and wild-type band 3 in two individuals with CHC with band 3 Memphis.

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Acknowledgements

We thank the affected individuals for their cooperation; P. Christopherson for supplies of NS1652 and NS3623; M. Chetty for technical support; P. Martin for DNA sequencing; R.J. Unwin for urinary acidification data; J. Delaunay, J. Newsome, P. Williamson, P. Gover, A.B. Mehta and S. Gibbs for permission to report on individuals in their care; and D.L. Rimm for advice on software. This work was supported by the National Kidney Research Fund (G.W.S., P.H.), Action Medical Research (J.C.E.), the Wellcome Trust (J.C.E., L.J.B.), Telethon (A.I.), the UK National Health Service R & D Directorate, MURST project PRIN (Italy) and the MIUR FIRB project (A.I.). Some work was carried out at the Department of Biochemistry, University of Bristol (L.J.B.).

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Correspondence to Gordon W Stewart.

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The authors declare no competing financial interests.

Supplementary information

Supplementary Fig. 1

Schematic diagram of band 3 membrane topology. (PDF 49 kb)

Supplementary Fig. 2

Family trees. (PDF 45 kb)

Supplementary Fig. 3

Blood films. (PDF 2933 kb)

Supplementary Fig. 4

Time course of increase in plasma [K] on storage of whole heparinised blood at 37, 20 and 0°C. (PDF 115 kb)

Supplementary Table 1

Further pedigrees in which SLC4A1 was sequenced. (PDF 24 kb)

Supplementary Table 2

Ion flux and hematological data in unpublished cryohydrocytosis cases. (PDF 38 kb)

Supplementary Table 3

Ion flux and hematological data in unpublished spherocytic cases. (PDF 75 kb)

Supplementary Note

Clinical details of previously unpublished patients. (PDF 19 kb)

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Bruce, L., C Robinson, H., Guizouarn, H. et al. Monovalent cation leaks in human red cells caused by single amino-acid substitutions in the transport domain of the band 3 chloride-bicarbonate exchanger, AE1. Nat Genet 37, 1258–1263 (2005). https://doi.org/10.1038/ng1656

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