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A TP53 polymorphism is associated with increased risk of colorectal cancer and with reduced levels of TP53 mRNA

Abstract

We undertook a case–control study to examine the possible associations of the TP53 variants Arg>Pro at codon 72 and p53PIN3, a 16 bp insertion/duplication in intron 3, with the risk of colorectal cancer (CRC). The p53PIN3 A2 allele (16 bp duplication) was associated with an increased risk (OR 1.55, 95% CI 1.10−2.18, P=0.012), of the same order of magnitude as that observed in previous studies for other types of cancer. The Pro72 allele was weakly associated with CRC (OR=1.34, 95% CI 0.98−1.84, P=0.066). The possible functional role of p53PIN3 was investigated by examining the TP53 mRNA transcripts in 15 lymphoblastoid cell lines with different genotypes. The possibility that the insertion/deletion could lead to alternatively spliced mRNAs was excluded. However, we found reduced levels of TP53 mRNA associated with the A2 allele. In conclusion, the epidemiological study suggests a role for p53PIN3 in tumorigenesis, supported by the in vitro characterization of this variant.

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Acknowledgements

Federica Gemignani is a recipient of a fellowship from the International Association for the Study on Lung Cancer (IASLC), part of the Cancer Research Foundation of America (CRFA). Stefano Landi is a recipient of a Marie Curie fellowship (HPMFCT-2000-00483) from the European Commission. S Gutièrrez-Enriquez and N Moullan are recipients of Special Training Awards from the International Agency for Research on Cancer. This work was partially funded by grants from the Maraton of TV3 48/95, Fondo de Investigaciones Sanitarias FIS 96/0797, FIS 00/0027, FIS 01/1264 and SAF 00/81, and Association pour la Recherche sur le Cancer #7478.

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Correspondence to Federico Canzian.

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Gemignani, F., Moreno, V., Landi, S. et al. A TP53 polymorphism is associated with increased risk of colorectal cancer and with reduced levels of TP53 mRNA. Oncogene 23, 1954–1956 (2004). https://doi.org/10.1038/sj.onc.1207305

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