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Targeted DNA Methylation Analysis by Next-generation Sequencing
Published on: February 24, 2015
CpG island methylation profiling in human melanoma cell lines
Carmen S Tellez1, Lanlan Shen, Marcos R H Estécio
1Department of Leukemia, The University of Texas M.D. Anderson Cancer Center, Houston, Texas, USA. ctellez@lrri.org
Melanoma Research
|May 16, 2009
Summary
Aberrant hypermethylation is common in melanoma cell lines and linked to global DNA methylation levels. These epigenetic changes are independent of BRAF and NRAS mutations, offering new insights into melanoma pathogenesis.
Area of Science:
- Oncology
- Epigenetics
- Molecular Biology
Background:
- Melanoma pathogenesis involves key molecular changes, including epigenetic alterations.
- Hypermethylation of tumor-suppressor genes and hypomethylation of other sequences are critical epigenetic events in cancer.
Purpose of the Study:
- To investigate aberrant DNA methylation patterns in melanoma cell lines.
- To determine the association between aberrant methylation and common mutations (BRAF, NRAS) in melanoma.
Main Methods:
- Pyrosequencing was used to analyze DNA methylation in 16 melanoma cell lines.
- Assessed hypermethylation of 15 cancer-linked genes and hypomethylation of 2 genes and 2 repetitive sequences.
- Genotyping for BRAF V600E and NRAS codon 61 mutations was performed.
Main Results:
- Aberrant hypermethylation was frequently observed across multiple genes, with RIL and ECAD showing 88% hypermethylation.
- Hypomethylation of MAGEA1, maspin, LINE-1, and Alu sequences was also common.
- No association was found between BRAF/NRAS mutations and aberrant methylation patterns.
Conclusions:
- Aberrant gene promoter hypermethylation is frequent in melanoma cell lines.
- The extent of aberrant hypermethylation correlates with global DNA methylation levels.
- Epigenetic alterations in melanoma are independent of BRAF and NRAS mutations.
