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. 1999 Dec 8;82(1):131–135. doi: 10.1054/bjoc.1999.0889

Promoter region methylation does not account for the frequent loss of expression of the Fas gene in colorectal carcinoma

L M Butler 1, A Dobrovic 2,3, T Bianco 2,3, P A Cowled 1
PMCID: PMC2363214  PMID: 10638979

Abstract

Expression of the apoptosis-promoting Fas gene is frequently reduced or lost during the development of colorectal carcinoma. However, loss of heterozygosity at the Fas locus or Fas gene rearrangements do not account for the loss of expression of Fas, raising the possibility that methylation of the Fas promoter may inhibit gene expression in colorectal carcinomas. We have examined the Fas promoter region CpG island for evidence of hypermethylation in colorectal tumours. Forty-seven specimens of colorectal adenoma and carcinoma, as well as six samples of normal colonic mucosa, were examined by Southern blotting for methylation at Hpa II and Cfo I sites in this region. No methylation was detected in any of the specimens, suggesting that hypermethylation is not primarily responsible for the loss of expression of the Fas gene during colorectal tumorigenesis. © 2000 Cancer Research Campaign

Keywords: CpG island, methylation, gene silencing, apoptosis

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Selected References

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