Regulatory feedback loops bridge the human gene regulatory network and regulate carcinogenesis

Area of Science:

• Systems Biology
• Genomics
• Network Science

Background:

• Disease development involves cellular disturbances and altered gene interactions within biological networks.
• Gene regulatory networks (GRNs) exhibit complex structures with core and peripheral components.

Purpose of the Study:

• To investigate the structural properties of the human gene regulatory network.
• To identify critical regulatory elements associated with disease, particularly cancer.
• To explore the functional significance of network topology in cellular systems.

Main Methods:

• Analysis of the human gene regulatory network structure.
• Identification of strongly connected components and peripheral structures.
• Characterization of regulatory feedback loops (FBLs) as an interface core.
• Enrichment analysis of cancer-associated and essential biomolecules within the interface core.
• Assessment of the 'bridgeness' of specific FBLs.

Main Results:

• The human GRN features a strongly connected core bridged by regulatory feedback loops (FBLs), forming an 'interface core'.
• This interface core is significantly enriched with cancer-associated and essential biomolecules and regulations.
• A specific FBL between HNF4A and NR2F2 exhibits the highest 'bridgeness' within the interface core.
• Disruption of the HNF4A-NR2F2 FBL may confer resistance to apoptosis in tumor cells.

Conclusions:

• The interface core plays a critical role in both network structure and cellular system function.
• The enrichment of disease-related elements in the interface core highlights its importance in pathology.
• The HNF4A-NR2F2 FBL represents a potential therapeutic target for cancer treatment.