Molecular cloning and characterization of FRAT2, encoding a positive regulator of the WNT signaling pathway.
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.[1]References
- 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. Biochem. Biophys. Res. Commun. (2001) [Pubmed]
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