The platypus is in its place: nuclear genes and indels confirm the sister group relation of monotremes and therians
van Rheede T, Bastiaans T, Boone D, Hedges SB, de Jong W, and Madsen O. 2006. The platypus is in its place: nuclear genes and indels confirm the sister group relation of monotremes and therians. Mol. Biol. Evol. 23:587-597. PMID:19033198
The transcription factor c-Myc is essential for cellular proliferation and is one of the most frequently activated oncogenes, but the molecular mechanism mediating its critical role in transformation is unclear. Like c-Myc, multifunctional nucleophosmin (NPM) is tightly regulated during proliferation and is overexpressed in several different types of cancer. Overexpression of NPM enhances proliferation and oncogene-mediated transformation, but the mechanism mediating these effects is unknown. We examined whether NPM stimulates proliferation and transformation by affecting c-Myc. Here, we show that NPM is essential for the activities of oncogenic c-Myc and that overexpressed NPM dramatically stimulates c-Myc-induced hyperproliferation and transformation. Endogenous and exogenous NPM directly interact with c-Myc and regulate the expression of endogenous c-Myc target genes at the promoter. Therefore, NPM is a key cofactor for the transforming activity of c-Myc and the interaction with c-Myc may mediate the enhancement of proliferation and transformation induced by NPM overexppression.