Abstract
In this study we report the cloning of four human OCT1 (hOCT1/SLC22A1) isoforms: a long form, hOCT1G/L554, and three shorter forms (hOCT1G/L506, hOCT1G483 and hOCT1G353). All four variants could be identified in the human glioma cell line SK‐MG‐1, whereas only two isoforms (hOCT1G/L554 and hOCT1G/L506) were found in human liver cDNA. The hOCT1G/L554 represents the full length hOCT1 since the sequence of this clone is more than 99% identical to previously cloned hOCT1 cDNAs. Elucidation of the gene structure of human OCT1 demonstrated that the other isolated isoforms are alternatively spliced variants. The hOCT1 gene consists of 7 exons and 6 introns. When stably expressed in human embryonic kidney (HEK293) cells, only the full length hOCT1 cDNA mediated decynium‐22 (D22)‐sensitive uptake of tritiated 1‐methyl‐4‐phenylpyridinium ([3H]‐MPP+).
Published Version
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