Mass Spectrometry-Based Validation of Chimeric RNAs.

Area of Science:

• Molecular Biology
• Genomics
• Biochemistry

Background:

• Chimeric RNAs, formed by fusing exons from different genes, are noncanonical transcripts implicated in cancer and development.
• Their unique nature presents challenges for accurate detection and validation, necessitating orthogonal methods beyond next-generation sequencing (NGS).

Purpose of the Study:

• To explore the principles and applications of mass spectrometry (MS)-based techniques for validating chimeric RNAs.
• To highlight MS strengths in confirming chimeric junction, reading frame, and abundance.

Main Methods:

• Utilizing mass spectrometry (MS)-based approaches, including targeted and untargeted peptidomics.
• Detailing critical considerations for sample preparation, data acquisition, and bioinformatic analysis for MS workflows.

Main Results:

• MS provides direct peptide-level evidence of chimeric junctions, confirming the existence and structure of fusion transcripts.
• MS-based methods offer quantitative insights into chimeric RNA abundance.
• This approach serves as a complementary strategy to NGS for robust chimeric RNA validation.

Conclusions:

• Mass spectrometry is a powerful tool for the definitive characterization and validation of chimeric RNAs.
• MS-based techniques offer high-confidence confirmation of chimeric RNA structure and abundance, crucial for biological and clinical research.