The ISG56/IFIT1 gene family

Area of Science:

• Immunology
• Molecular Biology
• Genetics

Background:

• The ISG56/IFIT1 gene family, including ISG56/IFIT1, ISG54/IFIT2, ISG60/IFIT3, and ISG58/IFIT5, is located on human chromosome 10.
• Homologs of these genes are evolutionarily conserved across mammals and amphibians.
• Normally silent, these genes are transcriptionally induced by interferons, viral infections, and pathogen-associated molecular patterns like double-stranded RNA and lipopolysaccharides.

Purpose of the Study:

• To investigate the structure and function of the ISG56/IFIT1 gene family and its encoded proteins.
• To understand the role of these genes in cellular and viral processes.

Main Methods:

• Gene family identification and characterization.
• Analysis of gene expression induction by interferons and viral stimuli.
• Protein structure analysis focusing on tetratricopeptide repeat (TPR) motifs.
• Investigation of protein-protein interactions and their functional consequences.

Main Results:

• The ISG56/IFIT1 family consists of four conserved members with evolutionary conservation.
• The encoded P56 proteins possess multiple TPR helix-turn-helix motifs crucial for protein interactions.
• These interactions modulate diverse cellular functions, including translation initiation, viral replication, and immune signaling.
• Functions affected include double-stranded RNA signaling, cell migration, and proliferation.

Conclusions:

• The ISG56/IFIT1 gene family plays a significant role in the innate immune response.
• The P56 proteins, through their TPR domains, act as versatile regulators of cellular and viral activities.
• Further research into this family could reveal therapeutic targets for viral diseases and immune modulation.