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Updated: Mar 31, 2026
Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model
Published on: July 3, 2020
Conditional Stat2 Knockout Mice as a Platform for Modeling Human Diseases
Tess Cremers1, Nataliya Miz2, Alexandra Afanassiev2
1Department of General Surgery, Cooper University Hospital, Camden, NJ 08103, USA.
Abstract:
Signal transducer and activator of transcription 2 (STAT2) is a key component of the type I interferon (IFN-I/III) signaling pathway, which is pivotal in host defense against cancer and viral infections and in shaping immune responses. Building on our previously reported conditional Stat2 knockout (KO) mouse, we expand its utility by validating additional tissue-specific models and exploring novel functional contexts. Mice carrying loxP-flanked Stat2 alleles were crossed with CMV-Cre, Cdx2-Cre or CD11c-Cre mice. Deletion of STAT2 was validated by PCR genotyping and western blotting in the relevant tissues. To confirm defective IFN-I signaling with STAT2 deletion, IFN-β stimulation of splenocytes from CMV-Cre Stat2 KO mice showed a lack of induction of canonical IFN-I target genes, confirming functional disruption of the pathway. In vivo, global Stat2 deletion significantly impaired the antitumor efficacy of IFN-β treatment. Similarly, lung fibroblasts isolated from globally deleted Stat2 KO mice showed defective antiviral responses to IFN-β. Tissue-specific Cre models demonstrated selective ablation of STAT2 in target compartments without affecting its expression in non-target tissues. Together, these studies expand our published conditional Stat2 KO findings and highlight the value of this model as a versatile platform for dissecting STAT2-dependent signaling pathways in a tissue- and disease-specific manner.
Insights
Signal transducer and activator of transcription 2 (STAT2) is crucial for type I interferon signaling in immunity. This study develops STAT2 knockout models to investigate its role in anti-cancer and anti-viral defenses.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- Signal transducer and activator of transcription 2 (STAT2) is essential for type I interferon (IFN-I/III) signaling.
- This pathway is critical for host defense against viral infections and cancer, and for regulating immune responses.
Purpose of the Study:
- To expand the utility of conditional Stat2 knockout (KO) mouse models.
- To validate tissue-specific STAT2 ablation and explore its functional roles in various contexts.
Main Methods:
- Generation of tissue-specific Stat2 KO mice by crossing floxed Stat2 mice with Cre-driver lines (CMV-Cre, Cdx2-Cre, CD11c-Cre).
- Validation of STAT2 deletion using PCR genotyping and Western blotting.
- Assessment of IFN-I signaling pathway function via IFN-β stimulation and analysis of target gene induction.
- Evaluation of STAT2's role in anti-tumor efficacy and antiviral responses in vivo and in vitro.
Main Results:
- STAT2 deletion was confirmed in target tissues of the generated KO models.
- STAT2-deficient cells showed impaired induction of IFN-I target genes upon IFN-β stimulation.
- Global Stat2 deletion significantly reduced the effectiveness of IFN-β in anti-tumor treatments.
- Lung fibroblasts from Stat2 KO mice exhibited defective antiviral responses to IFN-β.
Conclusions:
- The developed tissue-specific Stat2 KO models are valuable tools for studying STAT2 function.
- These models enable the dissection of STAT2-dependent signaling in a tissue- and disease-specific manner.
- STAT2 plays a significant role in mediating anti-tumor and antiviral responses through IFN-I signaling.
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