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Chromosomal localization and promoter analysis of the adenomatous polyposis coli binding protein RP1.

The EB1/ RP1 family is a new protein family that is characterized by the ability of its members to serve as interacting partners for the adenomatous polyposis coli (APC) tumour suppressor protein and tubulin. Data obtained with highly conserved yeast homologues suggest that the EB1/ RP1 protein family promotes cytoplasmic microtubule dynamics and contributes to the sensor mechanism controlling the cytokinesis checkpoint during mitosis. However, the precise function of this protein family in mammalian cells has not been elucidated so far and remains unclear. Here, we report on the genomic localization of the RP1 gene and the characterization of the corresponding promoter. The RP1 gene was found to be encoded on chromosome 18q21, a locus which is altered or deleted in up to 50% of all patients with colorectal cancer. Promoter analysis revealed that the RP1 gene is under the control of a strong promoter that was 10 times more active in mammalian cells when compared to SV40 promoter. Members of the cyclic AMP response element binding protein family (CREB1 and CREB2) could be identified as transcription factors binding specifically within the RP1 promoter sequence.[1]


  1. Chromosomal localization and promoter analysis of the adenomatous polyposis coli binding protein RP1. Wadle, A., Thiel, G., Mischo, A., Jung, V., Pfreundschuh, M., Renner, C. Oncogene (2001) [Pubmed]
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