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Promoter methylation of P16, RARβ, E-cadherin, cyclin A1 & cytoglobin in oral cancer: quantitative evaluation using pyrosequencing

Shaw, R.J.; Liloglou, T.; Rogers, S.N.; Brown, J.S.; Vaughan, E.D.; Lowe, D.; Field, J.K. and Risk, J.M. (2006) Promoter methylation of P16, RARβ, E-cadherin, cyclin A1 & cytoglobin in oral cancer: quantitative evaluation using pyrosequencing. British Journal of Cancer, 94 (4). pp. 561-568. ISSN 1532-1827 (Online); 0007-0920 (Print)

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Abstract

Introduction: Methylation profiling of cancer tissues has identified this mechanism as an important component of carcinogenesis. Epigenetic silencing of tumour suppressor genes through promoter methylation has been investigated by a variety of means, the most recent of which is pyrosequencing. We have investigated quantitative methylation status in oral squamous cell carcinoma patients. Method: Fresh tumour tissue and normal control tissue from resection margin was obtained from 79 consecutive patients undergoing resection of oral squamous cell carcinoma. DNA was extracted and bisulphite treated. PCR primers were designed to amplify 75-200bp regions of the CpG rich gene promoters of p16, E-cadherin, cytoglobin and cyclinA1. Methylation status of 4-5 CpG sites per gene was determined by pyrosequencing. Results: Significant CpG methylation of gene promoters within tumour specimens was found in 28% for p16, 73% for RARβ, 42% for E-cadherin, 65% for cytoglobin and 53% for cyclinA1. Promoter methylation was significantly elevated in tumours compared to normal tissue for p16 (P=0.048), cytoglobin (P=0.002) and cyclin A1 (P=0.001) but not in RARβ (P=0.088) or E-cadherin (P=0.347). Concordant methylation was demonstrated in this tumour series (P=0.03). Significant differences in degree of methylation of individual CpG sites were noted for all genes except RARβ and these differences were in a characteristic pattern that was reproduced between tumour samples. Cyclin A1 promoter methylation showed an inverse trend with histological grade . Conclusions: Promoter methylation analysis using pyrosequencing reveals valuable quantitative data from several CpG sites. In contrast to qualitative data generated from methylation specific PCR, our data demonstrated p16 promoter methylation in a highly tumour specific pattern. Significant tumour specific methylation of cyclin A1 promoter was also seen. Cytoglobin is a novel candidate tumour suppressor gene highly methylated in upper aero-digestive tract squamous cancer.

Item Type:Article
Additional Information:Published online 31 January 2006.
Uncontrolled Keywords:methylation; oral squamous cell carcinoma; pyrosequencing; SQUAMOUS-CELL CARCINOMA; TUMOR-ASSOCIATED GENES; CPG ISLANDS; PROGNOSTIC-SIGNIFICANCE; DNA METHYLATION; TOC LOCUS; PCR ASSAY; HEAD; NECK; HYPERMETHYLATION ISLANDS; PROGNOSTIC-SIGNIFICANCE; DNA METHYLATION; TOC LOCUS; PCR ASSAY; HEAD; NECK; HYPERMETHYLATION
Subjects:R Medicine > RK Dentistry
Departments, Research Centres and Related Units:Academic Faculties, Institutes and Research Centres > Faculty of Medicine > School of Dental Sciences
DOI:10.1038/sj.bjc.6602972
Publisher's Statement:Please acknowledge that this item was first published in British Journal of Cancer. © 2008 Nature Publishing Group.
Refereed:Yes
Status:Published
ID Code:166
Deposited On:07 May 2008 16:50
Last Modified:20 Mar 2012 12:21

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