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    Ann Hum Genet. 1999 Nov;63(Pt 6):473-82.

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

    Hayer M, Bönisch H, Brüss M.

    Source

    Institute of Pharmacology and Toxicology, University of Bonn, Reuterstr. 2b, D-53113 Bonn, Germany.

    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+).

    PMID:
    11388889
    [PubMed - indexed for MEDLINE]

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