The MAPK-Signaling Pathway in Colorectal Cancer: Dysregulated Genes and Their Association With MicroRNAs

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Mitogen-activated protein kinase (MAPK) pathways are crucial regulators of cellular processes like proliferation and apoptosis.
• Dysregulation of MAPK signaling is implicated in the development and progression of various cancers, including colorectal cancer (CRC).

Purpose of the Study:

• To investigate the differential expression of genes and microRNAs (miRNAs) within the MAPK signaling pathway in colorectal cancer.
• To identify direct associations between specific miRNAs and dysregulated genes in CRC.
• To explore potential therapeutic targets by elucidating miRNA-mediated regulation of MAPK signaling in CRC.

Main Methods:

• Analysis of gene expression (RNA-Seq) and miRNA expression data from 217 colorectal cancer (CRC) cases and paired normal tissues.
• Identification of differentially expressed genes (DEGs) in the MAPK pathway using fold change and statistical significance.
• Determination of miRNA:mRNA associations, prioritizing direct interactions through seed region matches and inverse expression patterns.

Main Results:

• Ninety-nine genes within the MAPK pathway exhibited significant differential expression in CRC.
• Thirteen dysregulated genes were associated with miRNAs, resulting in 68 miRNA:mRNA associations.
• Direct associations were identified for PDGFRA, RASGRP3, PRKCB, and TGFBR1 with specific miRNAs, suggesting direct regulatory roles upstream of key MAPK components (ERK1/2, JNK, p38).

Conclusions:

• MicroRNAs can directly modulate MAPK signaling in colorectal cancer by binding to key pathway genes.
• Specific identified miRNA-mRNA interactions represent potential therapeutic targets for CRC.
• Further validation of these findings in targeted CRC experiments is encouraged to solidify therapeutic strategies.