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[Correlation of inactivation of CDKN2/p16 gene by methylation and lung cancers]
1Department of Molecular Biology, Nanjing 81 Hospital, Nanjing, Jiangsu, 210002 P.R. China. sucq@jlonline.com
Objective:
To study the relationship between methylation state of CDKN2/p16 gene and lung cancers.
Methods:
Genomic DNA was digested with methylation-sensitive enzymes and Southern blotting was used to analyses the methylation state of CDKN2/p16 gene in 89 cases of lung cancer.
Results:
Twenty-one out of 89 lung cancers(23.6%) shown methylation of CDKN2/p16 gene, and 17 of them occurred in 42 P16 negative cases with a rate of 40.5%(17/42).
Conclusion:
Methylation of CDKN2/p16 gene 5' CpG island is probably an important mechanism of gene inactivation; it may take part in the onset and process of lung cancer.
Insights
Methylation of the CDKN2/p16 gene was observed in 23.6% of lung cancer cases. This gene alteration may play a role in lung cancer development.
Area of Science:
- Molecular Biology
- Oncology
- Genetics
Context:
- Lung cancer is a leading cause of cancer-related mortality worldwide.
- The CDKN2/p16 gene is a tumor suppressor involved in cell cycle regulation.
- Gene methylation is a key epigenetic mechanism influencing gene expression.
Purpose:
- To investigate the association between the methylation status of the CDKN2/p16 gene and the occurrence of lung cancer.
- To determine the frequency of CDKN2/p16 gene methylation in lung cancer patients.
Summary:
- Genomic DNA from 89 lung cancer patients was analyzed for CDKN2/p16 gene methylation using methylation-sensitive enzymes and Southern blotting.
- Methylation of the CDKN2/p16 gene was detected in 21 out of 89 cases (23.6%).
- Notably, 40.5% of P16-negative lung cancer cases exhibited CDKN2/p16 gene methylation.
Impact:
- The findings suggest that CDKN2/p16 gene methylation is a significant epigenetic event in lung carcinogenesis.
- Methylation of the CDKN2/p16 gene's 5' CpG island may represent an important mechanism for gene inactivation.
- This epigenetic alteration could contribute to the initiation and progression of lung cancer.