49 REVIEW Molecular mechanisms of autosomal dominant and recessive distal renal tubular acidosis caused by SLC4A1 (AE1) mutations Pa-thai Yenchitsomanus 1,2,3,* , Saranya Kittanakom 4, Nanyawan Rungroj 3, Emmanuelle Cordat 4, Reinhart A F Reithmeier 4 1Division of Medical Molecular Biology and 2BIOTEC-Medical Biotechnology Unit, 3Division of Molecular Genetics, Department of Research and Development, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand. 4Departments of Biochemistry and Medicine, University of Toronto, Toronto, Ontario, M5S 1A8, Canada *Correspondence to : Pa-thai Yenchitsomanus, Email :
[email protected], Tel : +662 4197000 ext 6666-70, Fax : +662 4184793 Journal of Molecular and Genetic Medicine (2005), 1(2), 49-62 © Copyright Pa-thai Yenchitsomanus et al Reviewers of this article included Professor Oliver Wrong (London, United Kingdom) (Received 14 July 2005; Revised 06 September 2005; Accepted 13 September 2005; Available online 16 November 2005; Published 30 December 2005) ABSTRACT - - Mutations of SLC4A1 (AE1) encoding the kidney anion (Cl /HCO 3 ) exchanger 1 (kAE1 or band 3) can result in either autosomal dominant (AD) or autosomal recessive (AR) distal renal tubular acidosis (dRTA). The molecular mechanisms associated with SLC4A1 mutations resulting in these different modes of inheritance are now being unveiled using transfected cell systems. The dominant mutants kAE1 R589H, R901X and S613F, which have normal or insignificant changes in anion transport function, exhibit intracellular retention with endoplasmic reticulum (ER) localization in cultured non-polarized and polarized cells, while the domi- nant mutants kAE1 R901X and G609R are mis-targeted to apical membrane in addition to the basolateral membrane in cultured polarized cells.