Abstract
Accumulation of mutations in tumour suppressor genes and oncogenes has been proposed to underlie the initiation and progression of sporadic colorectal cancer (CRC). Evidence is accumulating to suggest that the caudal homeobox gene CDX2 is implicated in the pathogenesis of CRC. The CDX2 transcription factor is expressed in intestinal epithelium and is markedly down-regulated in colon tumours. Furthermore, Cdx2 heterozygous null mice develop multiple intestinal tumours. In this present study, we have investigated CDX2 as a potential candidate gene for sporadic CRC by a thorough search of all exons and exon/intron boundaries for DNA polymorphisms and rare variants in a panel of CRC tumours. 6 polymorphisms were identified and the haplotypes determined. In addition two rare variants were found, one of which was only identified in DNA from a CRC case. Loss of heterozygosity was observed in 3 out of 28 informative CRC cases. A possible association between particular haplotypes and tumour progression was also suggested by the data. In addition a preliminary analysis of the relative expression of CDX2 alleles in tumour/normal tissue suggested some variation in the levels, however further analysis is required before any conclusions can be drawn. While CDX2 mutations predisposing to sporadic CRC have not been identified, this study has established that loss of CDX2 contributes towards the progression of some sporadic CRC tumours. © 2001 Cancer Research Campaign http://www.bjcancer.com
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Sivagnanasundaram, S., Islam, I., Talbot, I. et al. The homeobox gene CDX2 in colorectal carcinoma: a genetic analysis. Br J Cancer 84, 218–225 (2001). https://doi.org/10.1054/bjoc.2000.1544
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DOI: https://doi.org/10.1054/bjoc.2000.1544
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