Molecular dissection of the oncogenic role of ETS1 in the mesenchymal subtypes of head and neck squamous cell...

Area of Science:

• Oncology
• Molecular Biology
• Genomics

Background:

• Head and Neck Squamous Cell Carcinoma (HNSCC) is a deadly cancer with limited therapies.
• The mesenchymal subtype of HNSCC, linked to Epithelial to Mesenchymal Transition (EMT), shows poor survival and drug resistance.

Purpose of the Study:

• To investigate the role of ETS1, an oncogenic transcription factor, in mesenchymal HNSCC.
• To characterize the global ETS1 cistrome and its regulatory functions in EMT and invasion.

Main Methods:

• Integrated analysis of RNA-Seq, ChIP-Seq, and epigenomic data in an ETS1-high HNSCC cell line (SCC25).
• Identification of ETS1 binding sites, particularly Super-Enhancers of EMT genes.
• Analysis of ETS1's role in the TGF-β pathway.

Main Results:

• ETS1 is a key regulator of oncogenic processes and mesenchymal phenotypes, including EMT and invasion in HNSCC.
• ETS1 preferentially binds to cancer-specific regulatory elements, including Super-Enhancers of critical EMT genes.
• ETS1 significantly regulates the TGF-β pathway in mesenchymal HNSCC cells and tumors with partial-EMT features.

Conclusions:

• ETS1 is a master regulator of TGF-β-associated EMT in mesenchymal HNSCC.
• Targeting ETS1 presents a potential therapeutic strategy for specific HNSCC subtypes.