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Author Spotlight: Unlocking the Mysteries of Oral Potential Malignancies
Published on: August 11, 2023
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Global and promoter specific hypermethylation of tumor suppressor genes P16, SOCS1, and SHP1 in oral squamous cell
Shweta Ukey1, Ankit Jain1, Shailendra Dwivedi2
1All India Institute of Medical Sciences, Jodhpur, Rajasthan, India.
Journal of Cancer Research and Therapeutics
|February 22, 2024
Summary
Aberrant methylation patterns in tumor suppressor genes are linked to oral cancer progression. This study found significant differences in promoter and global methylation between oral squamous cell carcinoma (OSCC), oral submucous fibrosis (OSMF), and healthy controls, suggesting methylation load as a potential biomarker.
Area of Science:
- Oncology
- Epigenetics
- Molecular Biology
Background:
- Aberrant DNA methylation patterns are implicated in cancer development, including oral squamous cell carcinoma (OSCC).
- Previous research on tumor suppressor gene methylation (P16, SOCS1, SHP1) in cancers often relied on in-vitro or animal models, with limited human sample data.
- Oral submucous fibrosis (OSMF) is a precancerous condition, and understanding its molecular transition to OSCC is crucial.
Purpose of the Study:
- To investigate the association between global and promoter-specific methylation of tumor suppressor genes (P16, SOCS1, SHP1) in patients with OSCC and OSMF.
- To compare methylation patterns in human blood and tissue samples from OSCC patients, OSMF patients, and healthy controls.
- To explore the potential of methylation load as a minimally invasive biomarker for oral cancer progression.
Main Methods:
- Quantitative PCR (qPCR) was used to evaluate promoter-specific methylation of P16, SOCS1, and SHP1 in 76 OSCC and OSMF patient samples and 35 healthy controls.
- ELISA was employed to analyze global methylation patterns (%mC) in the same sample groups.
- Correlation analysis was performed to assess the relationship between methylation indices, global methylation, and risk factors like tobacco, smoking, and alcohol consumption.
Main Results:
- A significant decreasing trend in promoter methylation was observed: OSCC > OSMF > Controls.
- Methylation indices (MI) for P16, SHP1, and SOCS1 were significantly higher in OSCC patients compared to controls.
- Global methylation (%mC) values were markedly higher in OSCC (1.9) and OSMF (0.5) compared to controls (0.1).
- Methylation levels in tissue samples were reflected in blood samples, indicating potential for blood-based biomarkers.
- Methylation load correlated with risk factors (tobacco, smoking, alcohol) and showed reasonable sensitivity and specificity.
Conclusions:
- Global and promoter-specific methylation of tumor suppressor genes P16, SOCS1, and SHP1 play a role in the transition from OSMF to OSCC.
- Methylation load in blood samples could serve as a promising, less invasive biomarker for monitoring oral cancer progression.
- Further research is warranted to validate these findings and explore therapeutic interventions targeting epigenetic modifications.
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