Exploring conserved mRNA-miRNA interactions in colon and lung cancers

Area of Science:

• Oncology
• Genomics
• Bioinformatics

Background:

• MicroRNAs (miRNAs) are crucial regulators of gene expression with significant roles in cancer development and progression.
• Colon and lung cancers are complex diseases, necessitating the exploration of molecular interactions for biomarker discovery.
• Understanding the interplay between miRNAs and messenger RNAs (mRNAs) can reveal critical insights into oncogenesis.

Purpose of the Study:

• To prioritize co-expressed genes and miRNAs implicated in the pathogenesis of colon and lung cancers.
• To identify potential common biomarkers for colon and lung malignancies through integrated network analysis.
• To explore the regulatory networks underlying these cancers.

Main Methods:

• Gene expression data for colon and lung cancers were obtained from TCGA and Firehose databases.
• Gene regulatory networks were constructed using the parmigene R package and the ARACNE algorithm.
• Network-driven integrative analysis was performed to identify prognostic genes, miRNAs, and associated pathways.

Main Results:

• 192 differentially expressed miRNAs and their target genes were identified within the constructed gene regulatory networks.
• Key bottleneck nodes, including genes like BTF3, TP53, MYC, CALR, NEM2, and miRNAs such as miR-29b-3p and miR-145, were pinpointed.
• Enrichment analysis revealed significant involvement of these nodes in biosynthesis and signaling pathways, including Gene Ontology (GO) terms.

Conclusions:

• The study identified correlated gene expression alterations relevant to both colon and lung cancers.
• Specific genes and miRNAs were highlighted as potential common biomarkers for these two cancer types.
• The findings provide a foundation for further investigation into the molecular mechanisms and therapeutic strategies for colon and lung cancers.