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Title: Novel AE1 mutations in recessive distal renal tubular acidosis. Loss- of-function is rescued by glycophorin A
Authors: Voravarn S. Tanphaichitr
Achra Sumboonnanonda
Hiroshi Ideguchi
Chairat Shayakul
Carlo Brugnara
Mayumi Takao
Gavivann Veerakul
Seth L. Alper
Mahidol University
Fukuoka University
Beth Israel Deaconess Medical Center
Children's Hospital Boston
Harvard Medical School
Keywords: Medicine
Issue Date: 15-Dec-1998
Citation: Journal of Clinical Investigation. Vol.102, No.12 (1998), 2173-2179
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.
ISSN: 00219738
Appears in Collections:Scopus 1991-2000

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