Differentially expressed alternatively spliced genes in malignant pleural mesothelioma identified using massively...

Area of Science:

• Genomics and Molecular Biology
• Cancer Research
• Bioinformatics

Background:

• Alternative splicing generates diverse gene products, crucial for development and tissue-specific functions.
• Aberrant splicing patterns are implicated in various disease states, including cancer.
• Malignant pleural mesothelioma (MPM) is a rare but aggressive cancer with limited diagnostic markers.

Purpose of the Study:

• To investigate alternative splicing profiles in MPM using whole-transcriptome shotgun sequencing.
• To identify differentially expressed exon junctions associated with MPM.
• To evaluate the diagnostic potential of identified splice variants in MPM.

Main Methods:

• Developed a bioinformatics pipeline to map transcriptome reads to exon junctions in the AceView database.
• Calculated exon junction expression index (EJEI) to quantify alternative splicing events.
• Validated top differentially expressed exon junctions using quantitative real-time PCR (qRT-PCR) in clinical samples.

Main Results:

• Identified 70,953 exon junctions across 5 samples (4 MPM, 1 normal lung).
• Eight of the top ten differentially expressed exon junctions were validated by RT-PCR.
• Two specific exon junctions (ACTG2 and CDK4) showed statistically significant differential expression and classified MPM with high sensitivity (89% and 78%).

Conclusions:

• Whole-transcriptome shotgun sequencing and bioinformatics analysis are effective for identifying alternatively spliced variants.
• Differentially expressed exon junctions in MPM, such as those in ACTG2 and CDK4, can serve as diagnostic markers.
• These findings suggest potential therapeutic targets for MPM, warranting further investigation.