Novornabreak: Local Assembly for Novel Splice Junction and Fusion Transcript Detection from RNA-Seq Data

Area of Science:

• Genomics
• Bioinformatics
• Cancer Research

Background:

• RNA sequencing (RNA-seq) is crucial for understanding cancer transcriptomes.
• Detecting novel splice junctions and fusion transcripts is challenging with existing methods.
• Current approaches often struggle with complex alignments or unmapped reads.

Purpose of the Study:

• To introduce novoRNABreak, a unified framework for cancer-specific novel splice junction and fusion transcript detection.
• To provide an accurate and sensitive tool for analyzing RNA-seq data from human cancer samples.
• To offer a more efficient alternative to alignment-based and de novo whole transcriptome assembly (WTA) methods.

Main Methods:

• Developed a local assembly model balancing alignment-based and de novo WTA approaches.
• Focused on junction detection rather than full-length transcript assembly for efficiency.
• Utilized unmapped reads and handled multiple alignments for improved accuracy.

Main Results:

• novoRNABreak demonstrated superior performance on synthetic and real RNA-seq data (breast and prostate cancer).
• The tool accurately identified novel junctions, especially those with difficult alignments or multiple mapping possibilities.
• Efficiently processed RNA-seq data by focusing on junctions and leveraging unmapped reads.

Conclusions:

• novoRNABreak is an effective tool for identifying cancer-specific novel splice junctions and fusion transcripts.
• The framework offers improved accuracy and efficiency in RNA-seq data analysis for cancer research.
• novoRNABreak is publicly available on GitHub for broader scientific use.