Targeting and intracellular trafficking of clinically relevant hTHTR1 mutations in human cell lines. Clin Sci (Lond) 2007 Jul;113(2):93-102
Date
03/03/2007Pubmed ID
17331069DOI
10.1042/CS20060331Scopus ID
2-s2.0-34447512789 (requires institutional sign-in at Scopus site) 16 CitationsAbstract
The micronutrient thiamine is required for normal growth and development of human tissues, and is accumulated into cells through the activity of plasma membrane thiamine transporters, e.g. hTHTR1 (human thiamine transporter 1). Recent genetic evidence has linked mutations in hTHTR1 with the manifestation of TRMA (thiamine-responsive megaloblastic anaemia), a condition also associated with diabetes mellitus, sensorineural deafness and retinal disorders. To examine how mutations in hTHTR1 impair thiamine accumulation, we have investigated the targeting and functional properties of several different hTHTR1 mutants in human cell lines derived from epithelia relevant to thiamine absorption or tissues implicated in TRMA pathology. These constructs encompassed two newly identified point mutations (P51L and T158R) and two truncations of hTHTR1 identical with those found in TRMA kindreds (W358X and Delta383fs). Our results reveal a spectrum of mutant phenotypes, underlining that TRMA can result from decreased thiamine transport activity underpinned by changes in hTHTR1 expression levels, cellular targeting and/or protein transport activity.
Author List
Subramanian VS, Marchant JS, Said HMAuthor
Jonathan S. Marchant PhD Chair, Professor in the Cell Biology, Neurobiology and Anatomy department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
Anemia, MegaloblasticCell Line
Cytoplasm
DNA Mutational Analysis
Deafness
Diabetes Mellitus
Flow Cytometry
Humans
Membrane Transport Proteins
Microscopy, Confocal
Point Mutation
Protein Transport
Reverse Transcriptase Polymerase Chain Reaction
Thiamine
Thiamine Deficiency
Transfection
