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Title: Band 3 Edmonton I, a novel mutant of the anion exchanger 1 causing spherocytosis and distal renal tubular acidosis
Authors: Carmen Chu
Naomi Woods
Nunghathai Sawasdee
Helene Guizouarn
Bernard Pellissier
Franck Borgese
Pa Thai Yenchitsomanus
Manjula Gowrishankar
Emmanuelle Cordat
University of Alberta
Mahidol University
Universite Nice Sophia Antipolis
Keywords: Biochemistry, Genetics and Molecular Biology;Medicine
Issue Date: 15-Mar-2010
Citation: Biochemical Journal. Vol.426, No.3 (2010), 379-388
Abstract: dRTA (distal renal tubular acidosis) and HS (hereditary spherocytosis) are two diseases that can be caused by mutations in the gene encoding the AE1 (anion exchanger 1; Band 3). dRTA is characterized by defective urinary acidification, leading to metabolic acidosis, renal stones and failure to thrive. HS results in anaemia, which may require regular blood transfusions and splenectomy. Mutations in the gene encoding AE1 rarely cause both HS and dRTA. In the present paper, we describe a novel AE1 mutation, Band 3 Edmonton I, which causes dominant HS and recessive dRTA. The patient is a compound heterozygote with the new mutation C479W and the previously described mutation G701D. Red blood cells from the patient presented a reduced amount of AE1. Expression in a kidney cell line showed that kAE1 (kidney AE1) C479W is retained intracellularly. As kAE1 is a dimer, we performed co-expression studies and found that, in kidney cells, kAE1 C479W and G701D proteins traffic independently from each other despite their ability to form heterodimers. Therefore the patient carries one kAE1 mutant that is retained in the Golgi (G701D) and another kAE1 mutant (C479W) located in the endoplasmic reticulum of kidney cells, and is thus probably unable to reabsorb bicarbonate into the blood. We conclude that the C479W mutant is a novel trafficking mutant of AE1, which causes HS due to a decreased cell-surface AE1 protein and results in dRTA due to its intracellular retention in kidney. © The Authors.
ISSN: 14708728
Appears in Collections:Scopus 2006-2010

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