Abstract:
:The structure and expression of 14-3-3 sigma(sigma) was analysed in squamous carcinomas (SCC) of the vulva and in the vulval pre-malignant lesion vulval intraepithelial neoplasia (VIN). Sequence analysis of the sigma coding region did not detect mutations in any case of SCC or VIN III and loss of heterozygosity (LOH) occurred in only 2 out of 27 informative cases. In contrast to the absence of genetic change, methylation-specific PCR (MSP) analysis revealed dense CpG methylation within the sigma gene in approximately 60% of cases of vulval SCC, but methylation was not detected in matched, normal epithelial tissue. Methylation was associated in all cases with reduced or absent expression of sigma mRNA. There was no correlation between sigma methylation and HPV or p53 status. Analysis of pre-malignant vulval intraepithelial neoplasia (VIN) revealed that sigma methylation was detectable early in neoplastic development. Co-incident methylation, accompanied by loss of expression, of sigma and p16INK4a was commonly detected in both SCC and VIN III, suggesting that epigenetic silencing of these two genes is an early and important event in vulval neoplasia.
journal_name
Oncogenejournal_title
Oncogeneauthors
Gasco M,Sullivan A,Repellin C,Brooks L,Farrell PJ,Tidy JA,Dunne B,Gusterson B,Evans DJ,Crook Tdoi
10.1038/sj.onc.1205256subject
Has Abstractpub_date
2002-03-14 00:00:00pages
1876-81issue
12eissn
0950-9232issn
1476-5594journal_volume
21pub_type
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