Functional dynamic modulation of colorectal cancer initiation and metastatic capacity by a novel MiR-7974 regulatory...

Area of Science:

• Molecular Biology
• Genomics
• Oncology

Background:

• Colorectal cancer (CRC) is a prevalent malignancy with high rates of metastasis and recurrence, necessitating novel therapeutic strategies.
• Advancements in omics data analysis have elucidated complex regulatory networks in tumorigenesis, offering new avenues for cancer therapy.

Purpose of the Study:

• To identify novel microRNAs (miRNAs) involved in colorectal cancer (CRC) progression.
• To investigate the regulatory network and functional roles of miR-7974 in CRC growth and metastasis.

Main Methods:

• Systematic transcriptomic analysis of CRC tissues and normal samples to identify differentially expressed miRNAs.
• RT-qPCR, cell-based assays, and xenograft models to assess miR-7974's function in tumor progression.
• RNA sequencing, reporter assays, and functional rescue experiments to delineate the miR-7974 regulatory network, focusing on CDKN1A and MYO1E.

Main Results:

• miR-7974 exhibits distinct expression patterns in CRC, with high levels in early stages and decreased abundance in later, metastatic stages.
• miR-7974 promotes CRC growth by downregulating CDKN1A and reduces migration/invasion by targeting MYO1E.
• miR-7974 represses epithelial-to-mesenchymal transition (EMT), maintaining a proliferative epithelial phenotype and correlating with favorable patient survival outcomes.

Conclusions:

• miR-7974 regulates EMT plasticity in CRC, promoting proliferation while suppressing metastatic potential.
• The dynamic expression of miR-7974 and its target gene regulation provide mechanistic insights into metastatic potential acquisition.
• miR-7974's functional effects on CRC growth and its prognostic significance highlight its role in cancer development and miRNome dynamics.