Publication: Novel AE1 mutations in recessive distal renal tubular acidosis. Loss- of-function is rescued by glycophorin A
Issued Date
1998-12-15
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ISSN
00219738
DOI
Other identifier(s)
2-s2.0-0032535372
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Clinical Investigation. Vol.102, No.12 (1998), 2173-2179
Suggested Citation
Voravarn S. Tanphaichitr, Achra Sumboonnanonda, Hiroshi Ideguchi, Chairat Shayakul, Carlo Brugnara, Mayumi Takao, Gavivann Veerakul, Seth L. Alper Novel AE1 mutations in recessive distal renal tubular acidosis. Loss- of-function is rescued by glycophorin A. Journal of Clinical Investigation. Vol.102, No.12 (1998), 2173-2179. doi:10.1172/JCI4836 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/18433
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Title
Novel AE1 mutations in recessive distal renal tubular acidosis. Loss- of-function is rescued by glycophorin A
Abstract
The AE1 gene encodes band 3 Cl-/HCO3-exchangers that are expressed both in the erythrocyte and in the acid-secreting, type A intercalated cells of the kidney. Kidney AE1 contributes to urinary acidification by providing the major exit route for HCO3-across the basolateral membrane. Several AE1 mutations cosegregate with dominantly transmitted nonsyndromic renal tubular acidosis (dRTA). However, the modest degree of in vitro hypofunction exhibited by these dRTA-associated mutations fails to explain the disease phenotype in light of the normal urinary acidification associated with the complete loss-of-function exhibited by AE1 mutations linked to dominant spherocytosis. We report here novel AE1 mutations linked to a recessive syndrome of dRTA and hemolytic anemia in which red cell anion transport is normal. Both affected individuals were triply homozygous for two benign mutations M31T and K56E and for the loss-of-function mutation, G701D. AE1 G701D loss-of-function was accompanied by impaired trafficking to the Xenopus oocyte surface. Coexpression with AE1 G701D of the erythroid AE1 chaperonin, glycophorin A, rescued both AE1-mediated Cl-transport and AE1 surface expression in oocytes. The genetic and functional data both suggest that the homozygous AE1 G701D mutation causes recessively transmitted dRTA in this kindred with apparently normal erythroid anion transport.