Identification and Characterization of the Copy Number Dosage-Sensitive Genes in Colorectal Cancer

Area of Science:

• Genomics
• Cancer Biology
• Bioinformatics

Background:

• Somatic copy number alterations, particularly dosage effects, are implicated in colorectal cancer (CRC) pathogenesis.
• The specific roles of dosage-sensitive genes (DSGs) in CRC require deeper characterization.

Purpose of the Study:

• To develop and validate a pipeline for identifying DSGs in CRC.
• To analyze the functional and clinical significance of DSGs in CRC progression and therapeutic targeting.

Main Methods:

• A novel five-step computational pipeline was developed to identify DSGs.
• Comparative analysis of DSG identification between solid tumors and cell lines.
• Enrichment analysis of DSGs in cancer driver genes and pathways.
• Association analysis of DSGs with microsatellite instability and immune infiltration.
• Drug sensitivity analysis for amplified DSGs.

Main Results:

• The developed pipeline demonstrated superior performance compared to existing methods.
• Significant overlap in identified DSGs was observed between solid tumor and cell line data.
• Top DSGs, including PSMF1, RAF1, PTPRA, MKRN2, and ELP3, were associated with CRC progression.
• DSGs were enriched in driver genes, driving CRC-specific sub-pathways and correlating with immune-related features.
• Microsatellite-high CRC samples showed fewer DSGs but higher overlap with DSGs in microsatellite-low instability and microsatellite-stable samples.
• Twenty-two amplified DSGs were identified as potential targets sensitive to specific drugs.

Conclusions:

• DSGs play a significant role in the development and progression of colorectal cancer.
• The developed pipeline is an effective tool for identifying DSGs in CRC.
• DSGs represent promising candidates for targeted therapies in CRC.