Double agents: genes with both oncogenic and tumor-suppressor functions

Area of Science:

• Genetics
• Molecular Biology
• Cancer Biology

Background:

• Genetic components play a crucial role in cancer development.
• Some genes possess dual functions, acting as both oncogenes and tumor suppressors.
• Understanding these "double-agent" genes is vital for cancer research.

Purpose of the Study:

• To systematically identify genes with dual oncogenic and tumor-suppressor functions.
• To analyze the characteristics and roles of these genes in various cancer types.
• To investigate their contribution to cancer development mechanisms.

Main Methods:

• Systematic database searching and text mining to identify dual-function genes.
• Analysis of gene types (transcription factors, kinases) and biological functions.
• Comparison of mutation and expression patterns with oncogenes and tumor-suppressor genes across 12 cancer types.
• Protein-protein interaction network analysis.
• Examination of expression profiles in normal human organs.

Main Results:

• Most identified dual-function genes are transcription factors or kinases with complex regulatory roles.
• Leukemia is over-represented by these genes, while lung cancer is under-represented.
• Their mutation patterns resemble oncogenes, but expression patterns align with tumor suppressors.
• These genes function primarily as tumor suppressors in normal tissues.
• They exhibit higher network centrality, acting as hub genes in interaction networks.
• Mutations in "double-agent" genes and oncogenes are identified as major drivers of cancer.

Conclusions:

• "Double-agent" genes have distinct characteristics and play significant roles in specific cancer types.
• Their dual functions and network properties help explain cancer associations.
• Functionally altering mutations in "double-agent" genes and oncogenes are the primary drivers of cancer development.