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Deciphering the m6A Epitranscriptomic Landscape of mRNAs in Breast Cancer Cells
Konstantina Athanasopoulou1, Panagiotis G Adamopoulos1, Panagiotis Tsiakanikas1
1Department of Biochemistry and Molecular Biology, Faculty of Biology, National and Kapodistrian University of Athens, Athens, Greece.
Molecular and Cellular Biology
|October 6, 2025
Summary
N6-methyladenosine (m6A) patterns are altered in breast cancer cells, with specific cell lines showing either lower or higher methylation levels. This study maps m6A sites using nanopore sequencing, revealing insights into cancer heterogeneity.
Area of Science:
- Epigenetics
- Molecular Biology
- Cancer Research
Background:
- N6-methyladenosine (m6A) is the most abundant mRNA modification, regulating gene expression and cellular processes.
- Aberrant m6A patterns are implicated in various diseases, particularly cancer.
- Accurate detection and quantification of m6A sites remain a challenge.
Purpose of the Study:
- To create a transcriptome-wide, base-resolution map of the m6A methylome in human breast cancer cells.
- To investigate m6A distribution and its differential levels across various breast cancer cell lines.
- To explore the role of ALKBH5 in regulating m6A patterns in breast cancer.
Main Methods:
- Utilized nanopore sequencing for transcriptome-wide m6A mapping.
- Employed CRISPR/Cas9 technology to knock out the m6A eraser ALKBH5.
- Analyzed m6A epitranscriptome in five distinct breast cancer cell lines and a non-cancerous cell line (MCF-10A).
Main Results:
- Elucidated the m6A epitranscriptome across five breast cancer cell lines representing different molecular subtypes.
- Confirmed DRACH-motif-dependent activity of ALKBH5.
- Identified differential methylation: MCF-7 and BT-474 cells are hypomethylated, while BT-20, MDA-MB-231, and SK-BR-3 cells are hypermethylated compared to MCF-10A.
Conclusions:
- m6A dynamics exhibit significant heterogeneity across breast cancer cell lines, suggesting a regulatory role in cancer progression.
- The study provides a comprehensive m6A methylome map in breast cancer, enhancing understanding of its role in disease.
- Findings highlight the potential of targeting m6A pathways in breast cancer therapy.
