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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Isolation and cloning of JTAP-1: a cathepsin like gene upregulated in response to V-Jun induced cell transformation.

The oncogenic potential of Jun in chicken embryo fibroblasts (CEF) varies depending on its structure. V-Jun, which has a number of structural differences from c-Jun is highly transforming and tumorigenic. C-Jun however, is only weakly transforming and is not tumorigenic. We have used this difference in oncogenic potential between v-Jun and c-Jun to screen for downstream target genes associated with the v-Jun induced transformed phenotype. We describe here the identification, cloning and characterization of one of these genes, JTAP-1. JTAP-1 is consistently overexpressed 7 to 10-fold in CEF transformed by v-Jun compared with c-Jun overexpressing or normal CEF. This pattern of expression suggests that JTAP-1 is associated with the transformed phenotype. DNA and amino acid homology search analysis revealed that JTAP-1 shares a high degree of similarity with over 100 cysteine proteases from a variety of species and is likely the chicken homolog of cathepsin O. Analysis of expression of JTAP-1 in CEF overexpressing other oncogenes including v-Ha-ras, v-Src, c-Fos, and Myc revealed that it's overexpression is unique to v-Jun transformed cells. Thus, JTAP-1 is likely a specific target of v-Jun overexpression and not simply a consequence of cell transformation.[1]

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