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Molecular cloning, functional characterization and genomic organization of four alternatively spliced isoforms of the human organic cation transporter 1 (hOCT1/SLC22A1)

  • M. HAYER (a1), H. BÖNISCH (a1) and M. BRÜSS (a1)
  • Published online: 01 November 1999

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+).

Corresponding author
Correspondence: H. Bönisch. Fax: +49 -228–735404. E-mail:
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Annals of Human Genetics
  • ISSN: 0003-4800
  • EISSN: 1469-1809
  • URL: /core/journals/annals-of-human-genetics
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