The Double Face of miR-708: A Pan-Cancer Player with Dissociative Identity Disorder

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• MicroRNA-708 (miR-708) exhibits context-dependent roles in cancer, acting as both an oncogene and a tumor suppressor.
• Its expression patterns vary significantly across different tumor types, contributing to its complex regulatory functions.

Purpose of the Study:

• To comprehensively review the literature and analyze in silico data regarding miR-708's dual role in various cancers.
• To identify and characterize the molecular targets and signaling pathways influenced by miR-708.

Main Methods:

• Literature review of miR-708's function in oncogenesis.
• In silico analysis using The Cancer Genome Atlas (TCGA) and Gene Expression Omnibus (GEO) databases.
• Target gene identification and pathway enrichment analysis using miRBase, miRTarBase, and miRecords.

Main Results:

• miR-708 demonstrates oncogenic roles in 8 tumor types and tumor-suppressive roles in 7 types, consistent across literature and database analyses.
• In silico analysis revealed differential expression of miR-708 in various cancers compared to non-tumor tissues.
• Enrichment analysis identified key cancer-related pathways, including PI3K-Akt signaling and cell cycle control, regulated by 572 miR-708 targets, with 15 shared targets identified.

Conclusions:

• miR-708 functions as a "Janus" molecule in cancer, with opposing roles dependent on the tumor context.
• Identified targets and pathways provide insights into miR-708's involvement in tumoral phenotypes.
• Despite diagnostic/prognostic potential, miR-708's therapeutic application is limited by its multitarget nature and delivery challenges.