Please use this identifier to cite or link to this item: https://doi.org/10.1038/sj.onc.1210112
Title: The codon 72 polymorphism-specific effects of human p53 are absent in mouse cells: Implications on generation of mouse models
Authors: Phang, B.H.
Sabapathy, K. 
Keywords: Codon 72 polymorphism
CRM1
Growth inhibition
MDM2
Mouse cells
p53
Issue Date: 10-Mar-2007
Citation: Phang, B.H., Sabapathy, K. (2007-03-10). The codon 72 polymorphism-specific effects of human p53 are absent in mouse cells: Implications on generation of mouse models. Oncogene 26 (21) : 2964-2974. ScholarBank@NUS Repository. https://doi.org/10.1038/sj.onc.1210112
Abstract: Human p53, unlike mouse p53, contains a polymorphic site at codon 72 in exon 4 encoding either an arginine amino acid (72R) or a proline residue (72P). The 72R form was shown to induce apoptosis better than the 72P form, partly owing to its ability to efficiently bind to the nuclear-export protein CRM1 and localize to the mitochondria. This polymorphism has also been associated with cancer predisposition and chemo-sensitivity. Further understanding of the in vivo significance of this polymorphism in carcinogenesis requires the generation of mouse models. We have thus evaluated if the polymorphism-specific effects of human p53 are retained in mouse cells. Though being transcriptionally active, both the human polymorphs were found to have lost their ability to differentially suppress growth and bind to CRM1 or MDM2 in mouse cells. Moreover, chimaeric proteins containing mouse exons 2-3 and human exons 4-11 have also lost the polymorphism-specific effects in human cells, suggesting that human exons 2-3 are important in regulating the polymorphism-specific effects. Furthermore, human p53 and the various chimaeric proteins were generally less effective in inhibiting growth of mouse cells compared to mouse p53, suggesting that mouse p53 is more potent than human p53 in suppressing growth, partly due to enhanced binding of MDM2 to human p53. The data together suggest that mouse cells may not provide an appropriate environment for the manifestation of the polymorphism-specific functional differences of human p53, and hence, cautions against the expression of full-length or chimaeric p53 proteins in mice to study the effects of the polymorphism. © 2007 Nature Publishing Group All rights reserved.
Source Title: Oncogene
URI: http://scholarbank.nus.edu.sg/handle/10635/115318
ISSN: 09509232
DOI: 10.1038/sj.onc.1210112
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