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Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model
Published on: July 3, 2020
Mouse Model of STAT3 Mutation Resulting in Job's Syndrome Diverges from Human Pathology
Jakub Jankowski1, Jichun Chen2, Gyuhyeok Cho3
1Section of Genetics and Physiology, Laboratory of Cellular and Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, US National Institutes of Health, Bethesda, MD 20892, USA.
Abstract:
STAT3 mutations are commonly observed in human pathology yet have no uniform patient presentation. Their effects range from cancer and autoimmunity to primary immunodeficiencies and bone deformity. Designing animal models of those mutations can help researchers identify their direct effects to better inform the clinical setting. In this manuscript, we report a mouse model harboring the same mutation as an autosomal-dominant hyper-IgE syndrome (AD-HIES) patient reported in the literature. Surprisingly, while the deletion of five amino acids in the SH2 domain of STAT3 did result in frequency changes in several immune populations as measured by complete blood count and flow cytometry analysis, it did not yield the expected phenotype of AD-HIES, with no increase in serum IgE or eosinophil count. We additionally provide structural analysis of the STAT3G656_M660del deletion, visualizing changes in protein architecture and potential effects on the neighboring Y705 phosphorylation site. Our model showcases the sexually dimorphic immune dysregulation caused by a STAT3 mutation and highlights that predicted gain- and loss-of-function mutations can yield unexpected phenotypes.
Insights
STAT3 mutations cause diverse pathologies. A mouse model with a specific STAT3 mutation unexpectedly did not develop expected autoimmune symptoms, revealing complex disease mechanisms and sexually dimorphic immune effects.
Area of Science:
- Immunology
- Genetics
- Molecular Biology
Background:
- Signal transducer and activator of transcription 3 (STAT3) mutations are linked to various human diseases, including cancer, autoimmunity, and immunodeficiency.
- Patient presentations for STAT3 mutations are highly variable, complicating diagnosis and treatment.
- Animal models are crucial for dissecting the direct impact of specific STAT3 mutations.
Purpose of the Study:
- To develop and characterize a mouse model harboring the STAT3G656_M660del mutation found in an autosomal-dominant hyper-IgE syndrome (AD-HIES) patient.
- To investigate the direct phenotypic consequences of this specific STAT3 mutation in vivo.
- To analyze the structural impact of the mutation on STAT3 protein function.
Main Methods:
- Generation of a mouse model with the specific STAT3G656_M660del mutation.
- Complete blood count and flow cytometry analysis to assess immune cell populations.
- Structural analysis of the STAT3 protein, including visualization of the deletion and potential effects on phosphorylation sites.
Main Results:
- The mouse model exhibited altered frequencies of immune cell populations but did not develop the characteristic AD-HIES phenotype (elevated IgE, eosinophilia).
- Structural analysis revealed changes in protein architecture due to the deletion and potential impacts on the Y705 phosphorylation site.
- The study identified sexually dimorphic immune dysregulation associated with the STAT3 mutation.
Conclusions:
- The STAT3G656_M660del mutation in mice leads to unexpected phenotypes, highlighting the complexity of STAT3-related disorders.
- Predicted gain- or loss-of-function mutations can result in non-intuitive clinical presentations.
- This mouse model provides a valuable tool for studying STAT3-driven immune dysregulation and its sex-specific effects.
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