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Transcription factor E2F-1 and its interaction with pRb provide a key point of control in cell proliferation. E2F-1 participates in both cell cycle progression and apoptosis, and in cells exists with a DP dimerization partner protein, the most prominent being DP-1. By mining the tumor tissue and cancer cell line encyclopedia genomic databases, we identified the first somatic mutations in the DP-1 gene and describe 53 distinct mutation events here. The mutations are mostly missense mutations, but also include nonsense and frame-shift mutations that result in truncated DP-1 derivatives. Mutation occurs throughout the DP-1 gene but generally leaves protein dimerization activity intact. This allows the mutant derivatives to affect the properties of the E2F-1/DP-1 heterodimer through a transdominant mechanism, which changes the DNA binding, transcriptional activation and pRb-binding properties of the heterodimer. In particular, many DP-1 mutants were found to impair E2F-1-dependent apoptosis. Our results establish that somatic mutations in DP-1 uncouple normal control of the E2F pathway, and thus define a new mechanism that could contribute to aberrant proliferation in tumor cells.

Original publication

DOI

10.1038/onc.2013.316

Type

Journal article

Journal

Oncogene

Publication Date

03/07/2014

Volume

33

Pages

3594 - 3603

Keywords

Amino Acid Sequence, Apoptosis, Cell Line, Tumor, E2F1 Transcription Factor, Genetic Pleiotropy, Humans, Models, Molecular, Molecular Sequence Data, Mutation, Phosphoproteins, Protein Multimerization, Protein Structure, Quaternary, Protein Subunits, Retinoblastoma Protein, Transcription Factor DP1