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

Transforming activity of MECT1-MAML2 fusion oncoprotein is mediated by constitutive CREB activation.

Salivary gland tumors, a group of histologically diverse benign and malignant neoplasms, represent a challenging problem for diagnosis and treatment. A specific recurring t(11;19)(q21;p13) translocation is associated with two types of salivary gland tumors, mucoepidermoid carcinomas and Warthin's tumors. This translocation generates a fusion protein comprised of the N-terminal CREB (cAMP response element- binding protein)- binding domain of the CREB regulator MECT1 (Mucoepidermoid carcinoma translocated-1) and the C-terminal transcriptional activation domain of the Notch coactivator Mastermind-like 2 (MAML2). Here, we demonstrate that the MECT1-MAML2 fusion protein induces expression of multiple genes known to be CREB transcriptional targets. MECT1-MAML2 was found to bind to CREB, recruit p300/CBP into the CREB complex through a binding domain on MAML2, and constitutively activate CREB-dependent transcription. The transforming activity of MECT1-MAML2 was markedly reduced by blocking CREB DNA binding. Thus, this fusion oncogene mimics constitutive activation of cAMP signaling, by activating CREB directly. This study has identified a novel, critical mechanism of transformation for an oncogene associated very specifically with salivary gland tumors, and identified potential targets for the development of novel therapies.[1]


  1. Transforming activity of MECT1-MAML2 fusion oncoprotein is mediated by constitutive CREB activation. Wu, L., Liu, J., Gao, P., Nakamura, M., Cao, Y., Shen, H., Griffin, J.D. EMBO J. (2005) [Pubmed]
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