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MINI REVIEW article

Front. Allergy, 01 September 2023
Sec. Allergy Diagnosis
This article is part of the Research Topic Monogenic Inborn Errors of Immunity Associated with Atopy View all articles

Transcription factor defects in inborn errors of immunity with atopy

\r\nMaryam Vaseghi-Shanjani,Maryam Vaseghi-Shanjani1,2Pariya YousefiPariya Yousefi1Mehul SharmaMehul Sharma1Simran Samra,Simran Samra1,2Erika SifuentesErika Sifuentes1Stuart E. TurveyStuart E. Turvey1Catherine M. Biggs
\r\nCatherine M. Biggs1*
  • 1British Columbia Children’s Hospital, Department of Pediatrics, The University of British Columbia, Vancouver, BC, Canada
  • 2Experimental Medicine Program, Faculty of Medicine, The University of British Columbia, Vancouver, BC, Canada

Transcription factors (TFs) are critical components involved in regulating immune system development, maintenance, and function. Monogenic defects in certain TFs can therefore give rise to inborn errors of immunity (IEIs) with profound clinical implications ranging from infections, malignancy, and in some cases severe allergic inflammation. This review examines TF defects underlying IEIs with severe atopy as a defining clinical phenotype, including STAT3 loss-of-function, STAT6 gain-of-function, FOXP3 deficiency, and T-bet deficiency. These disorders offer valuable insights into the pathophysiology of allergic inflammation, expanding our understanding of both rare monogenic and common polygenic allergic diseases. Advances in genetic testing will likely uncover new IEIs associated with atopy, enriching our understanding of molecular pathways involved in allergic inflammation. Identification of monogenic disorders profoundly influences patient prognosis, treatment planning, and genetic counseling. Hence, the consideration of IEIs is essential for patients with severe, early-onset atopy. This review highlights the need for continued investigation into TF defects to enhance our understanding and management of allergic diseases.

Introduction

Inborn errors of immunity (IEIs) are a group of disorders in which parts of the human immune system are missing or dysfunctional, predisposing to infections, autoimmunity, inflammation, and malignancy (1). It is now appreciated that certain IEIs can predominantly cause severe and early-onset allergic disease, such as asthma, food and drug allergy, atopic dermatitis, and eosinophilic gastrointestinal disease (2). IEIs associated with atopy, also referred to as primary atopic disorders, are clinically and genetically heterogeneous with more than 48 known monogenic causes identified to date (35). The pathogenic underpinnings vary depending on the affected gene, spanning alterations of skin epithelial barrier function, through disruptions in cellular metabolism or actin cytoskeleton function, to defects in transcription factors (TFs) or signaling molecules important for immune cell development or function (4). There is a critical need to understand the mechanisms underlying atopic immune dysregulation in order to develop targeted therapeutics that can effectively address the dysregulated pathways.

In this review, we focus on monogenic allergic diseases caused by genetic variation in TFs, as within this group lie key clinical conditions for providers to be aware of, exciting new discoveries within the field, and important lessons in immunopathogenesis of allergic disease. TFs recognize specific DNA sequences through their DNA binding domain (DBD) to control transcription (6). They act as “master regulators” controlling immune cell lineage specification and governing specific signaling pathways (7). TFs are often structurally constrained, evolutionarily conserved and depleted of common variation within their DBDs (8). The variant alleles can exert effects through loss-of-function (LOF, e.g., non-functional protein product), gain-of-function (GOF, e.g., altering sequence recognition/strength or through constitutive activation), or dominant negative [DN, e.g., interfering with the wild-type (WT) allele through disrupted dimerization or off-target binding] mechanisms—or potentially through a combination of a number of these pathogenic mechanisms (9). TF defects can disrupt the expression of genes involved in immune system development, activation, and differentiation, leading to different IEI manifestations, including atopy (4, 5, 10). In this review, we will explore major classes of TFs implicated in monogenic allergic diseases, describing their role in immune cell function and human disease. We highlight the key clinical features of IEIs associated with atopy caused by TF defects, and therapies to consider for affected individuals.

Transcription factors orchestrating allergic immune responses

Transcription factors (TFs) function as central regulators of cellular functions, governing gene transcription through several known mechanisms (Figure 1) (11). TFs are proteins that bind to specific DNA sequences known as TF-binding sites that are situated in the promoter or enhancer regions of genes. Transcriptional regulation is mediated through recruitment of either co-activator or co-repressor accessory proteins which either enhance or inhibit transcriptional activity, respectively (12). Additionally, TFs can interact with chromatin remodelers to modify the structure of nucleosomes, which can affect the accessibility of DNA to transcriptional regulators. These proteins can also interact with RNA polymerase and either stimulate or inhibit its activity, leading to changes in transcriptional output. Lastly, TFs can integrate signals from various signaling pathways, such as growth factors, cytokines, or hormones, and modify gene expression accordingly. The specific mechanisms by which TFs regulate gene expression is context-dependent and as such varies between genes and cell types (6, 11, 13). Given their central role in regulating gene expression, minor variations in their expression and/or function can precipitate substantial disturbances in the gene regulation network. Furthermore, TFs require precision in their expression levels due to dosage sensitivity (14). This highlights the exactness required in TF expression and function, and the significant potential for harm from pathogenic variants in TF-encoding genes (15).

FIGURE 1
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Figure 1. Diverse mechanisms of gene expression regulation by transcription factors (TFs). (1) TFs integrate external stimuli, coordinating cellular responses through gene expression changes. (2) Upon binding to a specific DNA sequence, a TF can act as a bridge or docking site for chromatin remodeling complexes, aiding their recruitment to nearby nucleosomes. (3) By facilitating a process called “looping”, TFs bring the promoter region, where transcription initiates, into proximity with enhancer or silencer regions, which house TF binding sites. (4) Lastly, TFs can alter gene expression by interacting with co-activators and co-repressors via their protein-binding domains. In this multi-pronged manner, TFs form complex regulatory networks, shaping chromatin structure and guiding the transcriptional machinery. (Created with Biorender.com).

Transcription factors play central roles in immune system development, maintenance, and function. These factors not only regulate cell-fate determination, but also coordinate immune cell responses following exposure to both endogenous and exogenous stimuli such as pathogens and allergens (16). In atopic disorders, a complex network of genes and their products are regulated by a host of TFs to induce allergic inflammation, which involves the recruitment and activation of various immune cells, such as mast cells, eosinophils, and T-helper 2 (Th2) lymphocytes. This ultimately leads to the production of pro-inflammatory cytokines, chemokines, and allergen-specific IgE antibodies, which collectively contribute to the hallmark clinical features of allergic disease. Key TFs involved in this process are GATA-3, STAT6, NF-κB, T-bet, AP-1, and NFAT (17). While these TFs have been shown to play crucial roles in modulating allergic immune responses, we will focus our discussion on TFs that have been confirmed to cause monogenic allergic disease.

Transcription factors implicated in the pathophysiology of monogenic allergic diseases

Given the significant role that TFs play in modulating immune responses, it is not surprising that defects in TFs or their regulators have been linked to numerous human diseases, including approximately 25% of monogenic allergic disease (Table 1) (4, 18).

TABLE 1
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Table 1. Immunologic and clinical features of transcription factor defects in inborn errors of immunity associated with atopy.

 In some cases, the affected TFs are important for regulating the balance between Th1 and Th2 responses, commonly referred to as the “Th1/Th2 paradigm”. An imbalance or skewing towards either Th1 or Th2 disrupts immune homeostasis and can give rise to immune-related disorders. As such, the basis of allergy can be partly understood through the lens of this delicate equilibrium, as a skewing towards Th2 immunity and allergic inflammation (47). However, it is essential to recognize that the pathogenesis of monogenic allergic diseases is not solely restricted to dysregulation of Th1/Th2 balance. As we delve further into the molecular mechanisms underlying IEIs associated with atopy, it becomes increasingly clear that genetic variants in several components of the immune system, beyond those directly related to Th1 and Th2 cells, can cause these disorders. Consequently, a comprehensive understanding of monogenic allergic diseases necessitates the consideration of multiple molecular pathways and immune system components as contributors to disease etiology.

STAT family of transcription factors

Monogenic defects impacting the Janus kinase-signal transducer and activator of transcription (JAK-STAT) signaling pathway comprise a key group of IEIs associated with atopy (3, 10, 48). The JAK-STAT family consists of 7 TFs (STAT1, STAT2, STAT3, STAT4, STAT5A/B, and STAT6) and 4 receptor associated kinases (JAK1, JAK2, JAK3, TYK2) that regulate various cellular functions such as immunity, growth, differentiation, and survival (49, 50). Despite each of these TFs possessing distinct functions, they exhibit sequence similarities and analogous activation mechanisms. The JAK-STAT signaling cascade is initiated upon ligand binding to an extracellular cytokine or growth factor receptor, leading to activation of the JAK kinase, phosphorylation of the receptor, and recruitment and activation of STAT proteins. The STAT proteins then dimerize and migrate to the cell nucleus, where they bind to specific DNA sequences (response elements) in the promoter regions of target genes and regulate their transcription. The combinatorial and asymmetric activation of STAT TFs in response to a cytokine stimulus enables the JAK-STAT pathway to transmit over 50 unique cytokine signals and transcriptional outputs (5155). When one STAT TF's activity is significantly altered, the transcriptome induced by the cytokines upstream of its action will change. This leads to abnormal immune responses that frequently skew towards Th2, resulting in the atopic phenotype seen in IEIs caused by genetic variants in STATs including STAT1, STAT3, STAT5b and STAT6 (Table 1) (33, 36, 56, 57). The phenotypic variability seen between and within STAT TF defects stems not just from the variant's functional impact—whether LOF, GOF, or dominant negative (DN)—but also from which TFs' domain was genetically altered. Thus, understanding how these variants directly affect TF functionality, and consequently the JAK-STAT pathway, is crucial to comprehending the broad spectrum of clinical manifestations these diseases present.

One of the most well-studied IEIs associated with the JAK-STAT pathway is autosomal dominant hyper-IgE syndrome (AD-HIES)/STAT3 deficiency, characterized by eczema, eosinophilia, elevated IgE levels, mucocutaneous candidiasis, and connective tissue abnormalities (5860). AD-HIES is caused by DN variants in STAT3, typically missense or in-frame insertion/deletion variants impacting the highly conserved DNA-binding or Src Homology 2 (SH2) domain of the protein amongst other conserved regions (59, 60). Such changes do not alter the expression levels of STAT3 protein, but do hinder STAT3's ability to regulate gene transcription downstream of several key cytokines, notably IL-6, IL-10, IL-11 and IL-21 (Figure 2A) (61, 62). Defective IL-6 signaling leads to blunted inflammatory responses and impaired Th17 cell differentiation, with clinical features of recurrent staphylococcal and fungal infections. CD4+ T cells show Th2 skewing and production of IL-4, IL-5, IL-13, contributing to the atopic phenotype seen in these patients of eczema and eosinophilia. IL-21 is important for B cell maturation and class switching, while both IL-21 and IL-10 play a role in suppressing IgE production; impaired IL-10 and IL-21 responses thus lead to humoral defects and elevated IgE (61, 63). Lastly, impaired IL-11 signaling likely contributes to the delayed primary tooth exfoliation and distinctive facial features associated with AD-HIES (61, 64). Pathogenic germline variants in other molecules that regulate the expression and function of STAT3 have now been shown to be associated with severe atopic disease, signifying the central role for STAT3 in these disorders. These include Erbin (encoded by ERBB2IP), ZNF341 (encoded by ZNF341), and transforming growth factor beta (TGF-β) receptors (TGFBR1 and TGFBR2) (65, 66). Management of AD-HIES commonly requires antimicrobial prophylaxis and immunoglobulin replacement to prevent infectious exacerbations. Monoclonal antibodies targeting allergic immune effectors, including omalizumab (IgE), dupilumab (IL-4 and IL-13), reslizumab, benralizumab, and mepolizumab (IL-5), have shown efficacy in treating the eczema and other allergic manifestations (67). Hematopoietic stem cell transplantation (HSCT) can restore immune function and improve rates of infection and dermatological symptoms of these patients, especially when carried out at an early age (6870).

FIGURE 2
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Figure 2. Mechanisms by which variants in transcription factor-encoding genes cause inborn errors of immunity associated with atopy. (A) Signal transducer and activator of transcription 3 (STAT3) is integral to the transduction of multiple cytokine signals, including IL-6, IL-10, IL-11, IL-21, IL-22, and IL-23. Autosomal dominant loss-of-function (LOF) in STAT3 leads to abnormalities in several cytokine signaling pathways. Impaired IL-6 and IL-23 signaling hinders Th17 cell differentiation, increasing host susceptibility to mucosal bacterial and fungal infections. Additionally, IL-21 function is compromised, affecting B cell maturation and isotype switching, thereby leading to elevated IgE levels. Impaired IL-11 signaling is associated with connective tissue abnormalities. T helper 2 (Th2) skewing is observed in CD4+ T cells, and impaired IL-10 signaling is associated with impaired development of regulatory T cells (Tregs). (B) STAT6 plays a fundamental role in allergic inflammation, mediating the effects of cytokines essential for Th2 cell differentiation, B cell proliferation, and class switching to IgE. In T cells, STAT6 activation upregulates GATA Binding Protein 3 (GATA3) expression, amplifying cytokines IL-4, IL-5, and IL-13, which stimulate allergic responses, explaining the allergic phenotype observed in STAT6 gain-of-function (GOF). (C) T-bet, the master regulator of Th1 differentiation, suppresses Th2 cell lineage commitment by inhibiting GATA-3 function. T-bet deficiency disrupts this equilibrium, leading to increased chromatin accessibility of Th2 genes by GATA-3, resulting in the excessive production of Th2 cytokines like IL-5 and IL-13. (D) Forkhead box P3 (FOXP3) is an important TF for the development, stability, and suppressive function of Tregs. FOXP3 LOF leads to a failure in repressing the Th2 transcriptional program, generating “Th2-like” Tregs. These “Th2-like” Tregs exhibit increased intra-chromosomal interactions in the Th2 locus, leading to type 2 cytokine production. (Created with Biorender.com).

While LOF in certain STATs leads to allergic immune dysregulation as observed in AD-HIES, enhanced STAT TF activity can also cause severe atopy, with a notable example being the recently described IEI autosomal dominant STAT6 GOF (Figure 2B). The clinical phenotype associated with STAT6 GOF includes treatment-resistant atopic dermatitis, hypereosinophilia, eosinophilic gastrointestinal disease, asthma, elevated serum IgE, IgE-mediated food allergies, and anaphylaxis (36, 7173). Infections, growth impairment and vascular malformations of the brain have also been reported (36). The condition is caused by heterozygous missense variants located in several protein domains including the DNA-binding, linker-, and SH2 domain of STAT6. Despite their diverse locations, most of these variants are positioned near the TF-DNA interface. By increasing the electro-positivity at this interface, they are predicted to enhance STAT6 binding to DNA, thus conferring the GOF mechanism of pathogenicity. STAT6 is fundamentally involved in allergic inflammation processes. Its pivotal role includes mediating the effects of IL-4 and IL-13, cytokines essential for Th2 cell differentiation, B cell proliferation, survival, and class switching to IgE. In T cells, STAT6 activation upregulates GATA3 expression, a critical regulator of Th2 differentiation, which subsequently amplifies the expression of cytokines IL-4, IL-5, and IL-13. These cytokines stimulate allergic responses by activating mast cells and eosinophils. Thus, Th2 skewing and elevated levels of IL-4/IL-5/IL-13 produced by these cells could be the driving factor behind the allergic phenotype observed in STAT6 GOF. Precision treatment with the anti–IL-4Rα antibody, dupilumab, as well as JAK inhibitors have proven highly effective in improving both clinical manifestations and immune biomarkers of patients with STAT6 GOF (36, 73).

T-box transcription factor 21 (T-bet)

Transcription factors such as T-box transcription factor 21 (TBX21, also called T-bet) and GATA3 play pivotal roles in directing Th1 and Th2 differentiation, respectively. Aberrations in their signaling pathways or variants in genes encoding these TFs may contribute to the development of monogenic allergic diseases by disrupting the delicate equilibrium between Th1 and Th2 responses. The Th1/Th2 counter-regulatory theory is supported by a recent study describing an individual with an autosomal recessive LOF variant in TBX21 (42), encoding T-bet, the master regulator of Th1 differentiation (74). T-bet deficiency results in the loss of IFN-γ production, and in turn is linked to the excessive production of IL-5 and IL-13 by Th2 cells, leading to the development of upper airway allergic inflammation and eosinophilia (Figure 2C) (42). The Th2 skewing and the resulting atopic phenotype observed in this patient can be attributed to the known mechanism of action of T-bet. T-bet acts as a repressor of Th2 cell lineage commitment by preventing GATA3 from binding to its target DNA and suppressing GATA3 expression (41). Through these mechanisms, T-bet effectively suppresses the production of Th2 cytokines, including IL-4, IL-5, IL-9, and IL-13, which are crucial for Th2 cell function and the development of allergic responses. Therefore, it is expected that the loss of T-bet leads to an overactive Th2 response and the subsequent development of atopic conditions such as upper airway allergic inflammation and eosinophilia (42).

Forkhead Box P3

FOXP3 (Forkhead Box P3) is a TF that plays a critical role in maintaining immune homeostasis. It primarily controls the differentiation and function of regulatory T cells (Tregs), a subset of T cells that prevent harmful immune responses against self and environmental antigens. Pathogenic variants in FOXP3 cause IPEX syndrome (immune dysregulation, polyendocrinopathy, enteropathy, X-linked) (75), an IEI characterized by autoimmunity, lymphoproliferation and severe atopy. Affected individuals often present with severe atopic dermatitis, high IgE, and eosinophilia (10). Currently over 70 variants in FOXP3 associated with IPEX have been reported (76), with the majority impacting the forkhead (FKH) DNA-binding domain of FOXP3 at the C-terminal end of the protein. Some variants are located in other FOXP3 regions, including the N-terminal proline-rich (PRR) or leucine-zipper (LZ) domains, whereas others are located upstream of the gene or in the polyadenylation site, thus influencing mRNA expression and/or stability. While lack of FOXP3 expression has been linked to severe phenotypes, disease severity does not always correlate with protein expression. Many of the affected individuals have missense variants that lead to normal or reduced expression of the variant protein, disrupting the regulatory activity of FOXP3 by changing its DNA binding sites, interactions with other molecules, or its ability to form dimers (77).

FOXP3-deficient Tregs still develop in the thymus however they lose their regulatory function and acquire effector T cell (Teff) attributes (78, 79). The balance of T cell fate between Treg and Teff phenotype is in part related to metabolic programming which FOXP3 mediates. Teff cells are highly metabolically active, undergoing glycolysis and oxidative phosphorylation, whereas Treg metabolism favours fatty acid oxidative and keeps glycolysis under strict control. FOXP3 deficiency impairs its ability to regulate the metabolic kinase mammalian target of rapamycin (mTOR), leading to augmented glycolysis and degeneration of Tregs into Teff cells without suppressive function (79).

Several studies provide further insight into how alterations or loss of FOXP3 drives atopy (Figure 2D). One study recapitulated in a mouse model a human IPEX syndrome-causing variant (M370I) impacting the FKH domain of FOXP3 (80). Compared to wild-type Tregs, M370I Tregs were much less efficient at inhibiting GATA3 expression during T cell activation, thus skewing extrinsic CD4+ cells towards Th2 differentiation. Moreover, M370I Tregs were unable to repress Th2 transcriptional programs intrinsically, leading to generation of “Th2-like” Tregs with an effector Th2 phenotype and type 2 cytokine production. This is in keeping with previous work demonstrating FOXP3's role in preventing degeneration of Tregs into effector T cells. A separate study similarly demonstrated that downregulation of FOXP3 in human Tregs is associated with strong and selective upregulation of Th2 signature genes, such as GATA-3, IL-4, IL-5 and IL-13, supporting Th2 as the default differentiation pathway of FOXP3-negative Tregs (81).

Management of IPEX syndrome involves avoidance of immune triggers such as infections, immunosuppressive therapy to control aberrant immune responses, and HSCT. Immunomodulatory therapy with agents such as rapamycin are crucial in managing the overactive immune response and reducing inflammation and autoimmunity associated with the syndrome (76, 82). Rapamycin provides benefit in IPEX syndrome by partially restoring Treg function independent of FOXP3 expression or Treg frequency (82). A selective mTOR inhibitor, rapamycin induces a metabolic switch in FOXP3-deficient Tregs that suppresses the Teff-like reprogramming and restores their suppressive capacity (79, 82). HSCT represents a potentially curative treatment option for IPEX syndrome by replacing the dysfunctional immune system with that of a healthy donor (83).

Discussion

Transcription factors play a central role in immune cell responses and function. They integrate signals to regulate gene transcription in response to a stimulus, thus shaping the differentiation and phenotype of key immune cells. When the function of a TF involved in immune responses is altered, such as in the setting of a monogenic defect, profound clinical implications may arise. In this review, we highlighted key IEIs associated with atopy caused by TF defects, including STAT3 LOF, STAT6 GOF, FOXP3 deficiency, and T-bet deficiency. Studying these conditions has provided remarkable insights into the pathophysiology of allergic inflammation, with implications not only for the rare conditions themselves but for common allergic diseases as well. Given their indispensable role in immunity, we anticipate the identification of more forms of human IEIs caused by TF defects. Focusing on IEIs associated with atopy, we can consider other key TFs in whom a monogenic immune disorder has not yet been described, but that would be expected to have an atopic phenotype. Examples of these would include GATA3, a TF that regulates Th2 differentiation, as well as STAT4 (LOF) and BCL-6 that are also important for inhibiting or promoting a Th2 phenotype. As access to genetic testing expands, the global community is very likely to find new causes of IEIs with atopy, which may lead to some anticipated and unanticipated lessons on the factors governing allergic inflammation. Due to the important implications that identifying a monogenic disorder has on prognosis, treatment planning and genetic counselling, it is imperative that clinicians continue to consider IEIs on the differential of individuals who present with severe, early-onset atopy.

Author contributions

MV-S, MS, PY, ST, and CB contributed to the conceptualization and design of the manuscript. MV-S wrote the initial draft of the manuscript, CB, MS, and PY wrote sections of the manuscript and MV-S, PY, and CB generated the figures. MS, SS, ES, and ST contributed to additional drafts of the manuscript and critical revision. All authors contributed to the article and approved the submitted version.

Funding

CB holds a Health Professional-Investigator award from Michael Smith Health Research BC. MV-S is funded by the Vanier Canada Graduate Scholarship (Vanier CGS) and the University of British Columbia Four Year Doctoral Fellowship (4YF). ST holds a Translational Research Grant Award from the Jeffrey Modell Foundation. ST and CB hold a Project Grant from the Canadian Institutes of Health Research (PJT 178054). ST holds a Tier 1 Canada Research Chair in Pediatric Precision Health and the Aubrey J. Tingle Professor of Pediatric Immunology.

Acknowledgments

We would like to express gratitude to the patients who have inspired this work.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher's note

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Keywords: inborn errors of immunity, primary atopic disorders, allergy, atopy, transcription factor, monogenic allergic disease, precision medicine, primary immunodeficiency

Citation: Vaseghi-Shanjani M, Yousefi P, Sharma M, Samra S, Sifuentes E, Turvey SE and Biggs CM (2023) Transcription factor defects in inborn errors of immunity with atopy. Front. Allergy 4:1237852. doi: 10.3389/falgy.2023.1237852

Received: 10 June 2023; Accepted: 8 August 2023;
Published: 1 September 2023.

Edited by:

Rasha El-Owaidy, Ain Shams University, Egypt

Reviewed by:

Ekaterini Simoes Goudouris, Federal University of Rio de Janeiro, Brazil
Riccardo Castagnoli, National Institute of Allergy and Infectious Diseases (NIH), United States

© 2023 Vaseghi-Shanjani, Yousefi, Sharma, Samra, Sifuentes, Turvey and Biggs. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Catherine M. Biggs cbiggs@bcchr.ca

Abbreviations IEI, inborn error of immunity; TF, transcription factor; DBD, DNA binding domain; LOF, loss-of-function; GATA-3, GATA binding protein 3; GOF, gain-of-function; WT, wild-type; DN, dominant negative; STAT, signal transducer and activator of transcription; NF-κB, nuclear factor kappa B; AP-1, activator protein 1; NFAT, nuclear factor of activated T cells; JAK, janus kinase; TYK2, tyrosine kinase 2; AD-HIES, autosomal dominant hyper IgE syndrome; IL, interleukin; HSCT, hematopoietic stem cell transplantation; SH2, Src homology 2; FOXP3, forkhead box P3; IPEX, immune dysregulation, polyendocrinopathy, enteropathy, X-linked; FKH, forkhead; PRR, proline-rich region; LZ, leucine-zipper; mTOR, mammalian target of rapamycin.

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