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    Biochem Biophys Res Commun. 2001 Mar 2;281(3):815-20.

    Molecular cloning and characterization of FRAT2, encoding a positive regulator of the WNT signaling pathway.

    Saitoh T, Moriwaki J, Koike J, Takagi A, Miwa T, Shiokawa K, Katoh M.

    Source

    Genetics and Cell Biology Section, Genetics Division, National Cancer Center Research Institute, Tsukiji 5-chome, Tokyo, Chuo-ku, 104-0045, Japan.

    Abstract

    FRAT1 positively regulates the WNT signaling pathway by stabilizing beta-catenin through the association with glycogen synthase kinase-3beta. Here, we have cloned FRAT2 cDNAs, spanning the complete coding sequence, from a human fetal lung cDNA library. FRAT2 encoded 233 amino-acid protein, which showed 77.3% total amino-acid identity with FRAT1. FRAT2 and FRAT1 were more homologous in the acidic domain (96% identity), the proline-rich domain (92% identity), and the GSK-3beta binding domain (100% identity). The FRAT2 gene was mapped to human chromosome 10q24.1. The FRAT2 mRNA of 2.4-kb in size was relatively highly expressed in MKN45 (gastric cancer), HeLa S3 (cervical cancer), and K-562 (chronic myelogenous leukemia). Xenopus axis duplication assay revealed that the wild-type FRAT2 mRNA, but not the mutant FRAT2 mRNA lacking the acidic domain and the proline-rich domain, has the capacity to induce the secondary axis. These results indicate that FRAT2, just like FRAT1, functions as a positive regulator of the WNT signaling pathway. Thus, up-regulation of FRAT2 in human cancer might be implicated in carcinogenesis through activation of the WNT signaling pathway.

    Copyright 2001 Academic Press.

    PMID:
    11237732
    [PubMed - indexed for MEDLINE]

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