Abstract:
:The p53 gene is frequently mutated in cancers and it is vital for cell cycle control, homeostasis and carcinogenesis. We describe a novel p53 mutational spectrum, different to those generally observed in human and murine tumors. Our study shows a high prevalence of nonsense mutations in the p53 N terminus of 2-acetylaminofluorene (2-AAF)-induced urinary bladder tumors. These nonsense mutations forced downstream translation initiation at codon 41 of Trp53, resulting in the aberrant expression of the p53 isoform ΔN-p53 (or p44). We propose a novel mechanism for the origination and the selection for this isoform. We show that chemical exposure can act as a novel cause of selection for this truncated protein. In addition, our data suggest that the occurrence of ΔN-p53 accounts, at least in mice, for a cancer phenotype. We also show that gene expression profiles of embryonic stem (ES) cells carrying the ΔN-p53 isoform in a p53-null background are divergent from p53 knockout ES cells, and therefore postulate that ΔN-p53 itself has functional transcriptional properties.
journal_name
Oncogenejournal_title
Oncogeneauthors
Melis JP,Hoogervorst EM,van Oostrom CT,Zwart E,Breit TM,Pennings JL,de Vries A,van Steeg Hdoi
10.1038/onc.2010.552subject
Has Abstractpub_date
2011-04-14 00:00:00pages
1764-72issue
15eissn
0950-9232issn
1476-5594pii
onc2010552journal_volume
30pub_type
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