» Articles » PMID: 39974928

The SP140-RESIST Pathway Regulates Interferon MRNA Stability and Antiviral Immunity

Abstract

Type I interferons (IFN-Is) are essential for antiviral immunity but must be tightly regulated. The conserved transcriptional repressor SP140 inhibits interferon beta () expression via an unknown mechanism. Here we report that SP140 does not directly repress transcription. Instead, SP140 negatively regulates mRNA stability by directly repressing the expression of a previously uncharacterized regulator we call RESIST (REgulated Stimulator of Interferon via Stabilization of Transcript, previously annotated as Annexin-2 Receptor). RESIST promotes mRNA stability by counteracting mRNA destabilization mediated by the Tristetraprolin (TTP) family of RNA-binding proteins and the CCR4-NOT deadenylase complex. SP140 localizes within nuclear bodies, punctate structures that play important roles in silencing DNA virus gene expression in the nucleus. Consistent with this observation, we found that SP140 inhibits replication of the gammaherpesvirus MHV68. The antiviral activity of SP140 was independent of its ability to regulate . Our results establish dual antiviral and interferon regulatory functions for SP140. We propose that SP140 and RESIST participate in antiviral effector-triggered immunity.

References
1.
Wang H, Yang H, Shivalila C, Dawlaty M, Cheng A, Zhang F . One-step generation of mice carrying mutations in multiple genes by CRISPR/Cas-mediated genome engineering. Cell. 2013; 153(4):910-8. PMC: 3969854. DOI: 10.1016/j.cell.2013.04.025. View

2.
Cook M, Bradstreet T, Webber A, Kim J, Santeford A, Harris K . The ZFP36 family of RNA binding proteins regulates homeostatic and autoreactive T cell responses. Sci Immunol. 2022; 7(76):eabo0981. PMC: 9832469. DOI: 10.1126/sciimmunol.abo0981. View

3.
Barton E, Mandal P, Speck S . Pathogenesis and host control of gammaherpesviruses: lessons from the mouse. Annu Rev Immunol. 2011; 29:351-97. DOI: 10.1146/annurev-immunol-072710-081639. View

4.
Mehta S, Cronkite D, Basavappa M, Saunders T, Adiliaghdam F, Amatullah H . Maintenance of macrophage transcriptional programs and intestinal homeostasis by epigenetic reader SP140. Sci Immunol. 2017; 2(9). PMC: 5549562. DOI: 10.1126/sciimmunol.aag3160. View

5.
McLean C, Bristor D, Hiller M, Clarke S, Schaar B, Lowe C . GREAT improves functional interpretation of cis-regulatory regions. Nat Biotechnol. 2010; 28(5):495-501. PMC: 4840234. DOI: 10.1038/nbt.1630. View