Type I Interferon Regulates the Expression of Long Non-Coding RNAs.

Area of Science:

• Molecular Biology
• Immunology
• Genetics

Background:

• Interferons (IFNs) are crucial for antiviral responses, inducing IFN-stimulated genes (ISGs) to establish an antiviral state.
• While ISGs primarily include coding genes, long non-coding RNAs (lncRNAs) represent a significant portion of the transcriptome with largely unexplored roles in IFN signaling.

Purpose of the Study:

• To investigate whether interferons (IFNs) regulate the expression of long non-coding RNAs (lncRNAs).
• To identify and characterize IFN-stimulated lncRNAs (ISRs) and IFN-downregulated lncRNAs (IDRs) and explore their potential roles in antiviral responses.

Main Methods:

• Transcriptome analysis using expression arrays on HuH7 cells treated with IFNα2.
• Validation of identified lncRNAs through gene expression analysis in response to varying IFN doses, different cell lines, and viral infections.
• Analysis of lncRNA expression in patient samples infected with HCV and HIV.

Main Results:

• Identified several IFN-stimulated lncRNAs (ISRs) and IFN-downregulated lncRNAs (IDRs).
• Expression of ISR2, ISR8, and ISR12 correlated with neighboring IFN-responsive coding genes (GBP1, IRF1, IL6).
• ISR2 and ISR8 were upregulated in response to IFNα2, IFNβ, and a specific influenza virus strain, and were significantly elevated in HCV and HIV patient samples.

Conclusions:

• IFNs regulate the expression of specific lncRNAs, expanding the known repertoire of IFN-responsive genes.
• ISRs like ISR2, 8, and 12 are implicated in viral processes and the IFN-mediated antiviral pathway.
• These lncRNAs may function as critical regulators, either promoting or suppressing the antiviral response, and represent potential therapeutic targets for viral infections.