Systematic analysis of RNA-binding proteins identifies targetable therapeutic vulnerabilities in osteosarcoma

Area of Science:

• Oncology
• Molecular Biology
• Genomics

Background:

• Osteosarcoma (OS) is the most common primary bone cancer with poor prognosis due to metastasis.
• Current genomic, epigenomic, and transcriptomic analyses reveal molecular complexity but lack sufficient therapeutic targets.
• Understanding RNA-protein interactions is crucial for elucidating OS mechanisms.

Purpose of the Study:

• To systematically explore RNA-protein interactions in osteosarcoma.
• To identify common and specific alterations in RNA-binding proteins across OS tumors.
• To uncover novel therapeutic targets and mechanisms in osteosarcoma.

Main Methods:

• Defined RNA interactomes, proteomes, and transcriptomes from OS and normal cells.
• Analyzed RNA-binding activities of RNA-binding proteins (RBPs).
• Performed functional analyses to assess tumor vulnerabilities and feedback loops.

Main Results:

• Identified systematic changes in RBP activities common to all OS.
• Discovered individual alterations in RBPs specific to subsets of OS tumors.
• Revealed OS vulnerability to translation inhibition and a positive feedback loop involving IGF2BP3 and Myc.

Conclusions:

• RNA-protein interactions play a significant role in osteosarcoma development and progression.
• The IGF2BP3-Myc feedback loop represents a potential therapeutic vulnerability.
• These findings offer insights into RBP-dependent mechanisms for clinical relevance in OS treatment.