Recent advances in understanding inherited deficiencies in immunity to infections

preprint OA: closed CC-BY-4.0

Abstract

The immune system is central to our interactions with the world in which we live and importantly dictates our response to potential allergens, toxins, and pathogens to which we are constantly exposed. Understanding the mechanisms that underlie protective host immune responses against microbial pathogens is vital for the development of improved treatment and vaccination strategies against infections. To that end, inherited immunodeficiencies that manifest with susceptibility to bacterial, viral, and/or fungal infections have provided fundamental insights into the indispensable contribution of key immune pathways in host defense against various pathogens. In this mini-review, we summarize the findings from a series of recent publications in which inherited immunodeficiencies have helped illuminate the interplay of human immunity and resistance to infection.
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Constantine" }, { "@type": "Person", "name": "Michail S. Lionakis" } ], "publisher": { "@type": "Organization", "name": "F1000Research", "logo": { "@type": "ImageObject", "url": "https://f1000research.com/img/AMP/F1000Research_image.png", "height": 480, "width": 60 } }, "image": { "@type": "ImageObject", "url": "https://f1000research.com/img/AMP/F1000Research_image.png", "height": 1200, "width": 150 }, "description": "The immune system is central to our interactions with the world in which we live and importantly dictates our response to potential allergens, toxins, and pathogens to which we are constantly exposed. Understanding the mechanisms that underlie protective host immune responses against microbial pathogens is vital for the development of improved treatment and vaccination strategies against infections. To that end, inherited immunodeficiencies that manifest with susceptibility to bacterial, viral, and/or fungal infections have provided fundamental insights into the indispensable contribution of key immune pathways in host defense against various pathogens. In this mini-review, we summarize the findings from a series of recent publications in which inherited immunodeficiencies have helped illuminate the interplay of human immunity and resistance to infection." } { "@context": "http://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": "1", "item": { "@id": "https://f1000research.com/", "name": "Home" } }, { "@type": "ListItem", "position": "2", "item": { "@id": "https://f1000research.com/browse/articles", "name": "Browse" } }, { "@type": "ListItem", "position": "3", "item": { "@id": "https://f1000research.com/articles/9-243/v1", "name": "Recent advances in understanding inherited deficiencies in immunity..." } } ] } Home Browse Recent advances in understanding inherited deficiencies in immunity... ALL Metrics - Views Downloads Get PDF Get XML Cite How to cite this article Constantine GM and Lionakis MS. Recent advances in understanding inherited deficiencies in immunity to infections [version 1; peer review: 2 approved] . F1000Research 2020, 9 (F1000 Faculty Rev):243 ( https://doi.org/10.12688/f1000research.22036.1 ) NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article. Close Copy Citation Details Export Export Citation Sciwheel EndNote Ref. Manager Bibtex ProCite Sente EXPORT Select a format first Track Share ▬ ✚ Review Recent advances in understanding inherited deficiencies in immunity to infections [version 1; peer review: 2 approved] Gregory M. Constantine https://orcid.org/0000-0001-5379-9475 1 , Michail S. Lionakis 1 Gregory M. Constantine https://orcid.org/0000-0001-5379-9475 1 , Michail S. Lionakis 1 PUBLISHED 07 Apr 2020 Author details Author details 1 Fungal Pathogenesis Section, Laboratory of Clinical Immunology and Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, 20814, USA Gregory M. Constantine Roles: Conceptualization, Data Curation, Writing – Original Draft Preparation, Writing – Review & Editing Michail S. Lionakis Roles: Conceptualization, Data Curation, Supervision, Writing – Original Draft Preparation, Writing – Review & Editing OPEN PEER REVIEW DETAILS REVIEWER STATUS Abstract The immune system is central to our interactions with the world in which we live and importantly dictates our response to potential allergens, toxins, and pathogens to which we are constantly exposed. Understanding the mechanisms that underlie protective host immune responses against microbial pathogens is vital for the development of improved treatment and vaccination strategies against infections. To that end, inherited immunodeficiencies that manifest with susceptibility to bacterial, viral, and/or fungal infections have provided fundamental insights into the indispensable contribution of key immune pathways in host defense against various pathogens. In this mini-review, we summarize the findings from a series of recent publications in which inherited immunodeficiencies have helped illuminate the interplay of human immunity and resistance to infection. READ ALL READ LESS Keywords immunodeficiency, inherited, monogenic, infection, immunology, infectious disease Corresponding Author(s) Michail S. Lionakis ( [email protected] ) Close Corresponding author: Michail S. Lionakis Competing interests: No competing interests were disclosed. Grant information: This work was supported by the Division of Intramural Research at National Institute of Allergy and Infectious Diseases (NIAID), National Institutes of Health (NIH). The content of this publication does not necessarily reflect the views or policies of the Department of Health and Human Services nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. Government. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Copyright: © 2020 Constantine GM and Lionakis MS. This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The author(s) is/are employees of the US Government and therefore domestic copyright protection in USA does not apply to this work. The work may be protected under the copyright laws of other jurisdictions when used in those jurisdictions. How to cite: Constantine GM and Lionakis MS. Recent advances in understanding inherited deficiencies in immunity to infections [version 1; peer review: 2 approved] . F1000Research 2020, 9 (F1000 Faculty Rev):243 ( https://doi.org/10.12688/f1000research.22036.1 ) First published: 07 Apr 2020, 9 (F1000 Faculty Rev):243 ( https://doi.org/10.12688/f1000research.22036.1 ) Latest published: 07 Apr 2020, 9 (F1000 Faculty Rev):243 ( https://doi.org/10.12688/f1000research.22036.1 ) Introduction Insights through the observation and study of primary immunodeficiency disorders (PIDs) provide a unique in vivo lens through which our understanding of human immunology can be advanced. Herein, we discuss recent discoveries that have furthered our collective understanding of the host immune response in protection from the constant environmental threats posed by bacteria, viruses, and fungi. We focus on interleukin (IL)-6 receptor-alpha (IL-6Rα) deficiency and dominant activating Rac family small GTPase 2( RAC2 ) mutations leading to bacterial infection susceptibility, EROS deficiency and its impact on innate immunity, interferon (IFN) regulatory factor 4 (IRF4) haploinsufficiency causing susceptibility to Whipple’s disease (WD), defects in IL-12 receptor subunit beta 2 (IL-12RB2), IL-23 receptor (IL-23R), RAR-related orphan receptor C (RORC), Janus kinase 1 (JAK1), and tyrosine kinase 2 (TYK2) contributing to mycobacterial disease, deficiency in IFNα receptor-1 (IFNAR1), melanoma differentiation associated protein-5 (MDA5), IRF9, or IL-18 binding protein (IL18-BP) and gain-of-function (GOF) mutations in NLR family pyrin domain containing 1 ( NLRP1 ) leading to viral infection susceptibility, and fungal infection susceptibility in the setting of caspase recruitment domain-containing protein 9 (CARD9) deficiency, zinc finger protein 341 (ZNF341) deficiency, and c-Jun N-terminal kinase 1 (JNK1) haploinsufficiency. Recent insights gained from primary immunodeficiency disorders manifesting with bacterial infection susceptibility IL-6 signaling: a critical role in control of bacteria Prompt recognition of bacterial pathogens is paramount in the defense against infection, and, among the mechanisms that initiate the immune cascade, IL-6 plays a central role. As a pleiotropic pro-inflammatory cytokine, IL-6 leads to the initiation of the acute-phase response by driving the recruitment of innate immune cells and pathogen phagocytosis while also promoting adaptive immune responses through mediating B cell survival and maturation, T cell proliferation, and the lineage commitment of T follicular, T H 17, and T H 22 helper cells 1 – 3 . Classical cell-membrane signaling of IL-6 is mediated through a hexameric complex composed of two IL-6 molecules, two IL-6Rα receptors, and two transmembrane glycoprotein 130 (gp130) proteins through which signal transduction is propagated via JAK and signal transducer and activator of transcription (STAT) interactions 4 – 6 . Iatrogenic, acquired, and inherited defects have provided evidence of the consequences of impaired IL-6 signaling through their impact on infection susceptibility. Severe staphylococcal infections have been described in patients treated with the anti-IL-6R monoclonal antibody tocilizumab and in spontaneously acquired autoantibodies against circulating IL-6 7 – 9 . Furthermore, inherited homozygous mutations in IL6ST, encoding the gp130 co-receptor, predispose to recurrent severe staphylococcal and streptococcal infections 10 as well as elevated serum IgE and dental and cranio-skeletal manifestations reminiscent of hyper-IgE syndrome (HIES) caused by dominant-negative mutations in STAT3 11 , 12 . It was not until recently that inherited deficiency in IL-6Rα was identified. Specifically, Spencer et al. reported two patients with severe recurrent infections with defective acute-phase response, elevated IgE, atopic dermatitis, and peripheral eosinophilia caused by pathogenic variants in IL6R 13 . An additional four patients from two unrelated families with IL6R mutations were also reported sharing a similar clinical phenotype with severe bacterial infectious complications caused by Streptococcus pneumoniae , Staphylococcus aureus , Haemophilus influenzae , and Neisseria meningiditis 14 ( Table 1 ). Mechanistically, shared among all of these IL-6 pathway functional defects is absent or delayed production of acute-phase reactants including C-reactive protein, which plays a crucial role in the protection against bacterial pathogens including Streptococci , Klebsiella pneumoniae , and Neisseria meningitidis through opsonization and phagocytosis by macrophages and neutrophils 1 , 15 – 17 . Table 1. Recently described primary immunodeficiencies associated with increased risk of infection Gene/ protein Variant(s) Inheritance model Clinical manifestations Laboratory findings Associated pathogens Host response to bacteria IL6R /IL- 6RA G183Efs*7;I279N AR, LOF Atopic dermatitis, respiratory infections, skin abscesses, recurrent skin infections Variably low IgG, IgA ↑ IgE ↓ CRP Streptococcus pneumoniae , Staphylococcus aureus , Haemophilus influenzae , Neisseria meningitidis IRF4 /IRF4 R98W AD, haploinsufficiency Whipple’s disease, chronic Tropheryma whipplei carriage NR T. whipplei RAC2 /RAC2 E62K; P34H AD, GOF Recurrent sinopulmonary infections, bronchiectasis, cellulitis, lymphadenitis, B cell lymphoma, littoral cell angioma Neutropenia, lymphopenia, variable hypogammaglobulinemia, increased DHR N. meningitidis , varicella zoster, HPV, herpes simplex CYBC1 / EROS c.127G>A; Y2X AR, LOF Short stature, skin/soft tissue infections, lymphadenitis, recurrent sinopulmonary infections, granulomatous inflammation, AIHA, HLH, CGD, IBD Impaired DHR, lymphopenia BCG, Burkholderia cepacia, Legionella, Candida albicans, Clostridium difficile, Mycobacterium tuberculosis Host response to mycobacteria IL12RB2 / IL-12Rβ1 Q138X AR, LOF Lymphadenitis, pulmonary tuberculosis Increased naïve CD4 + and CD8 + T cells BCG, M. tuberculosis IL23R /IL- 23R C115Y AR, LOF Lymphadenitis, disseminated BCG infection Increased naïve CD4 + and CD8 + T cells BCG TYK2/ TYK2 P1104A AR, LOF Primary tuberculosis Increased naïve CD4 + and CD8 + T cells, reduced effector memory T cells M. tuberculosis, NTM RORC /RORγ/ RORγt Q308X; Q420X AR, LOF Thymic hypoplasia, CMC, disseminated BCG infection, tuberculosis, eczematous dermatitis, recurrent skin infections CD4 + and CD8 + T cell lymphopenia ↓IFN-γ production ↓ IL-17A/F, IL-21, IL-22 production BCG, M. tuberculosis, C. albicans JAK1 / JAK1 P733L; P832S AR, LOF Recurrent sinopulmonary infections, osteomyelitis, developmental delay, urothelial carcinoma, skin infections, flat warts, crusted scabies Reduced naive CD4 + and CD8 + T cells, Impaired PHA response Impaired IFN-γ, IFN-α, IL- 2, IL-4, IL-10, and IL-27 responses ↓IFN-γ production ↑ IL-6 production NTM, Sarcoptes scabiei , HPV Host response to viruses IFNAR1 / IFNAR1 V225fs; W261X, V225_P23 2del AR, LOF Disseminated vaccine- strain measles, yellow fever vaccine-associated viscerotropic disease Impaired type I IFN responses Vaccine-strain measles, vaccine-strain yellow fever IFIH1 / MDA5 K365E AR, LOF Recurrent viral respiratory infections Reduced IFN-β, IFN-λ transcription HRV, influenza B, influenza A, coronavirus, RSV, parainfluenza IRF9 /IRF9 E166Lfs*80, D331N AR, LOF Recurrent viral infections, severe influenza infection Variable mild lymphopenia, variable hypogammaglobulinemia, impaired type I IFN responses Influenza A IL18BP /IL- 18 BP c.508-19_528del AR, LOF HAV-induced acute liver failure ↑ IL-18 HAV NLRP1 / NLRP1 T755N AR, GOF Recurrent respiratory papillomatosis, palmar and plantar warts ↑ IL-18 ↑TNF-α HPV TLR3 /TLR3 P554S; P680L AD, LOF Acute respiratory distress syndrome ↓IFN-β and IFN-λ from fibroblasts Influenza A, RSV Host response to fungi CARD9 / CARD9 NA AR, LOF Mucocutaneous and CNS fungal infections ↓ CNS neutrophil recruitment due to impaired IL-1β/CXCL1 microglial production ↓ neutrophil killing against unopsonized Candida yeasts Impaired IL-17 responses C. albicans, Aspergillus species, agents of dermatophytosis and phaeohyphomycosis ZNF341 / ZNF341 R302X; K355fs; Y542X; Q195X AR, LOF CMC, staphylococcal skin infections, respiratory infections, bronchiectasis, severe atopic dermatitis, food and environmental allergy, connective tissue abnormalities Low NK Cells Low memory B cells Low central memory CD4 + and CD8 + T cells Low IgM, IgA ↑ IgE S. aureus, C. albicans, Candida glabrata MAPK8 / JNK1 c.311+1G>A AD, haploinsufficiency Systemic connective tissue disorder, CMC, recurrent bacterial skin infections, urinary tract infections Impaired IL-17A/F responses C. albicans, Staphylococcal species AD, autosomal dominant; AIHA, autoimmune hemolytic anemia; AR, autosomal recessive; BCG, Bacillus Calmette-Guérin; CARD9, caspase recruitment domain-containing protein 9; CGD, chronic granulomatous disease; CMC, chronic mucocutaneus candidiasis; CNS, central nervous system; CRP, C-reactive protein; DHR, dihydrorhodamine test; GOF, gain-of-function; HAV, Hepatitis A virus; HLH, hemophagocytic lymphohistiocytosis; HPV, human papilloma virus; HRV, human rhinovirus; IBD, inflammatory bowel disease; IFN, interferon; IFNAR1, interferon alpha receptor-1; Ig, immunoglobulin; IL, interleukin; IL-6RA, interleukin-6 receptor-alpha; IL-12Rβ1, interleukin-12 receptor subunit beta 1; IL-18 BP, interleukin-18 binding protein; IL-23R, interleukin-23 receptor; IRF, interferon regulatory factor; JAK1, Janus kinase 1; JNK1, c-Jun N-terminal kinase 1; LOF, loss-of-function; MDA5, melanoma differentiation associated protein-5; NA, not applicable; NK, natural killer; NLRP1, NLR family pyrin domain containing 1; NR, not reported; NTM, non-tuberculous mycobacteria; PHA, phytohemagglutinin; RAC2, Rac family small GTPase 2; ROR, RAR-related orphan receptor; RSV, respiratory syncytial virus; TNF, tumor necrosis factor; TLR3, Toll-like receptor-3; ZNF341, zinc finger protein 341. As the IL-6 signaling pathway has been implicated in autoimmune and inflammatory diseases such as rheumatoid arthritis, giant cell arteritis, Castleman’s disease, and cytokine release syndrome in the setting of CAR T cell therapy for malignancies, anti-IL-6R therapies have become increasingly more common 18 . As such, surveillance for bacterial infectious complications is warranted in the setting of anti-IL-6 biological therapies. Whipple’s disease: 111 years later Described initially by George Hoyt Whipple 19 , WD is a chronic infection manifested by malabsorptive diarrhea, weight loss, and arthritis caused by the Gram-positive bacillus Tropheryma whipplei 20 . Despite T. whipplei being ubiquitous in the soil and water, WD is rare, with an estimated incidence of 1–3 cases per 1 million people 21 . Interestingly, asymptomatic carriage is relatively frequent, ranging from ~4–31% depending on the geographical area 22 , 23 . The vast majority of infected individuals suffer from self-limited illness, suggesting that an impaired immunological response may play a role in those with chronic or invasive forms of the disease 24 – 27 . Through the investigation of four related patients with WD, Guérin et al. reported a rare loss-of-function (LOF) mutation in IRF4 causing haploinsufficiency 28 . It is important to note that a total of 12 individuals were found to be heterozygous for the p.R98W variant in IRF4 ( Table 1 ), including the four WD patients, five chronic T. whipplei carriers, two non-carriers, and one relative who was not tested for T. whipplei, thereby indicating incomplete penetrance. IRF4 is an important transcription factor for the development of immune cells as well as T H 2, T H 9, and T H 17 responses ( Figure 1 ); however, its role in the control of bacterial infection has been less clear 29 , 30 . In vitro studies of patient cells demonstrated that the mutant IRF4 allele failed to bind DNA or induce transcription. Additional transcriptional analysis of T. whipplei -infected peripheral blood mononuclear cells (PBMCs) did not detect specific pathway enrichment; however, Mycobacterium bovis –Bacillus Calmette-Guérin (BCG)-infected PBMCs demonstrated downregulation of STAT1 and IFN-γ-associated pathways. These results suggest that IRF4 haploinsufficiency may predispose to T. whipplei via impaired T H 1 helper cell mechanisms. Despite the potential impact on the IFN-γ axis, patients with IRF4 haploinsufficiency appear to be selectively susceptible to WD without susceptibility to other intracellular pathogens that rely on intact IFN-γ/STAT1 signaling (e.g. mycobacteria, Salmonella , etc.), implying that other parallel and/or compensatory immune mechanisms may play a role. Additional work is needed to further delineate the cell-specific mechanistic role of IRF4 in host defense against WD. Figure 1. The IFN-γ/IL-12, IL-23, IL-17 axis and NADPH complex in host defense against pathogens Mycobacteria are recognized and phagocytosed, leading to IL-12 (p40/p35) secretion by macrophages. Binding of IL-12 to its receptor on the surface of T H 1 (or NK) cells activates the downstream JAK2 and TYK2 signaling cascade, resulting in STAT4 phosphorylation and dimerization. STAT4 homodimers translocate to the nucleus and induce the transcription of IFN-γ. Phosphorylated STAT1 homodimers translocate to the nucleus, resulting in the transcription of host defense genes. Similarly, IL-23 comprising the p40 and p19 subunits binds to the IL-23 receptor, leading to JAK2/TYK2 activation and STAT3 phosphorylation, dimerization, and nuclear translocation, where it associates with IRF4 and RORγt in the transcription of IL17 - , IL21 - , and IL22 -related genes. The membrane-bound gp91 phox and p22 phox heterodimer (cytochrome b558) is stabilized by the transmembrane chaperone protein EROS. The remaining cytosolic components, p67 phox , p47 phox , and p40 phox , along with RAC2-GTP, associate to form the activated NADPH complex. Secondary signal from CD40/CD40L signaling activates the NF-κB pathway. GATA2, GATA binding factor 2; gp, glycoprotein; IFN, interferon; IFNG, interferon gamma; IFNGR, interferon gamma receptor; IL, interleukin; IL-12RB, IL-12 receptor subunit beta; IRF4, interferon regulatory factor 4; JAK2, Janus kinase 2; NAPDH, nicotinamide adenine dinucleotide; NEMO, nuclear factor-κB essential modulator; NF-κB, nuclear factor-κB; NK, natural killer; RAC2, Rac family small GTPase 2;RORγt, RAR-related orphan receptor γt; STAT, signal transducer and activator of transcription; T H 1, T helper type 1; TYK2, tyrosine kinase 2. This figure is adapted and amended with permissions, from Figure 3 in Abers, A, Lionakis, M. Chronic mucocutaneous candidiasis and invasive fungal infection susceptibility. In: Sullivan, K.E, Stiehm, E.R Stiehm's Immune Deficiencies-Inborn Errors of Immunit . p1–44. 2nd ed. Copyright Elsevier Science & Technology. 2020 37 . EROS, NADPH oxidase, and innate immunity The generation of reactive oxygen species (ROS) via the nicotinamide adenine dinucleotide (NADPH) complex is an essential component of innate host defense. Mutations in four of the genes encoding the protein components of the NADPH complex (gp91 phox , p22 phox, p67 phox , and p47 phox ) cause chronic granulomatous disease (CGD) manifested by an impaired phagocyte respiratory burst resulting in infectious susceptibility to bacteria and fungi 31 , 32 . Instead, inherited defects affecting the fifth protein, p40 phox , result in severe inflammatory complications with modest infection susceptibility 33 . A newly described transmembrane protein, EROS, has also been identified to play a key role in ROS production through stabilization of the gp91 phox and p22 phox heterodimer, cytochrome 588b 34 ( Figure 1 ). A cohort of eight individuals with a homozygous null mutation in CYBC1 encoding EROS demonstrated a CGD-like disease with severe infections and associated colitis 35 . Patients demonstrated absent cytochrome 588b surface expression and severely reduced neutrophil oxidative burst. Interestingly, Thomas et al . 36 reported a Saudi Arabian boy with biallelic mutations affecting CYBC1 who, unlike the previously reported patients, suffered from recurrent sinopulmonary infections, autoimmune hemolytic anemia, and hemophagocytic lymphohistiocytosis (HLH) ( Table 1 ). Evaluation of the patient’s PBMCs showed absent EROS protein, while neutrophils demonstrated defective respiratory burst following stimulation with either phorbol 12-myristate 13-acetate (PMA) or zymosan. These cases provide additional evidence for EROS deficiency manifesting as a CGD-like disease but, given the heterogeneous clinical phenotype, also raise questions for additional roles that EROS may play in infection susceptibility and inflammation. Dominant activating RAC2 mutations and bacterial lung disease RAC2 is a guanine nucleotide-binding protein belonging to the rho guanosine triphosphatase (GTPase) family. It is expressed in the hematopoietic compartment, where it promotes cell migration, adhesion, and oxygen radical production 38 , 39 ( Figure 1 ). Human RAC2 LOF mutations have been described to result in neutrophil defects 40 , severe combined immunodeficiency 41 , and a common variable immunodeficiency (CVID) clinical phenotype 42 . Recently, RAC2 dominant activating mutations were discovered in which patients suffered from recurrent bacterial sinopulmonary infections and bronchiectasis 43 , 44 . Patients exhibited lymphopenia possibly as a result of increased apoptosis 43 while neutrophils demonstrated excessive superoxide production ( Table 1 ), aberrant n-formyl methionyl-leucyl-phenylalanine (fMLF)-mediated chemotaxis, impaired macropinocytosis, and compromised actin remodeling in vitro 44 . This combined immunodeficiency underscores the importance of both neutrophil and lymphocyte function in the protection against bacterial lung disease. Teasing apart cellular signaling in the host response to mycobacteria IFN-γ is critical for the control of intracellular pathogens including mycobacteria, Salmonella , Listeria, endemic fungi, and others 45 , 46 . Disorders of mendelian susceptibility to mycobacterial disease (MSMD) comprise 11 different genes to date, resulting in 21 different genetic diseases 47 . Of these rare inherited disorders, autosomal-recessive (AR) IL-12 receptor β1 (IL-12Rβ1) deficiency accounts for the majority of cases 48 . The IL12RB1 gene encodes for IL-12Rβ1, which mediates IL-12 and IL-23 signaling via dimerization with IL-12Rβ2 and IL-23R components to form IL-12 and IL-23 receptors, respectively 49 , 50 ( Figure 1 ). Similarly, mutations in IL12B encoding the IL-12 p40 subunit common to both IL-12 and IL-23 exhibit a clinical phenocopy of IL-12Rβ1 deficiency 51 . Unlike most other MSMDs, a subset of patients with either of these two PIDs also carry susceptibility to chronic mucocutaneous candidiasis (CMC), thought to originate from compromised signaling via the IL-23/IL-17 pathway that is important for T H 17 cell development and mucosal immunity 52 . As both IL-12 and IL-23 signaling are impaired by these disorders, the individual contribution of each of these cytokines in the immune response to mycobacteria and mucosal candidiasis had remained unclear. Through the identification of AR LOF mutations in either IL12RB2 or IL23R affecting separate kindreds with MSMD without CMC, Martínez-Barricarte et al . underscored the importance of both IL-12 and IL-23 signaling pathways and their effects on IFN-γ mediated immunity 53 ( Table 1 ). Compared to healthy controls, patients deficient in IL-12Rβ2 demonstrated fewer memory T H 1 cells and impaired T H 1 differentiation in vitro , while IL-23R-deficient patient T cells showed impaired T H 17 differentiation in vitro . The authors further investigated the impact of IL-12 and IL-23 on IFN-γ cellular responses by isolating several lymphoid cell types (i.e. B, CD4 + T, CD8 + T, γδ + T, and natural killer [NK] cells, type-1 innate lymphocyte cells [ILC1s], type-2 ILCs [ILC2s], type-3 ILCs [ILC3s], NKT cells, and mucosal-associated invariant T [MAIT] cells) from healthy donors. In response to IL-12 stimulation, B, T, γδ + , and NK cells and ILC1s and ILC2s produced IFN-γ, whereas only NKT and MAIT cells preferentially produced IFN-γ in response to IL-23. Interestingly, ILC3s produced IFN-γ upon either IL-12 or IL-23 stimulation. Taken together, these recent findings demonstrate the cooperative effect of these cytokines among a panoply of cell types to promote IFN-γ-mediated protection from mycobacterial infection. Like IL-12Rβ1 deficiency, AR TYK2 deficiency demonstrates impaired IFN-γ-mediated immunity through defective IL-12 and IL-23 signaling, resulting in intracellular bacterial (and/or viral) infections 54 , 55 ( Figure 1 ). Recently, a common TYK2 mutation, P1104A, with a homozygous allele frequency of ~1/600 Europeans, has been identified 56 ( Table 1 ). Unlike complete TYK2 deficiency, TYK2 P1104A exclusively impairs IL-23 responses due to compromised catalytic activity, thereby disrupting IFN-γ production and conferring risk of mycobacterial infection 56 . In individuals of European ancestry, TYK2 P1104A may underlie a genetic basis for ~1% of tuberculosis cases; these findings indicate that inherited risk alleles may underpin infection susceptibility at the population level 57 . RORC in the control of mycobacteria and Candida RORC encodes the transcription factors RORγ and RORγt. RORγ is ubiquitously expressed, whereas the RORγt isoform is restricted to lymphocytes where it regulates IL-17-related gene transcription ( Figure 1 ) and T H 17 T cell development 58 , 59 . Recently, biallelic mutations in RORC affecting seven individuals from three unrelated kindreds with CMC and atypical mycobacterial infections have been described 60 . Patient cells demonstrated impaired IL-17A, IL-17F, and IL-22 responses, likely accounting for mucosal susceptibility to Candida albicans. In the evaluation of the etiology of mycobacterial vulnerability, PBMCs exposed to BCG and IL-12 demonstrated reduced IFN-γ secretion as a result of selectively impaired γδ and CCR6 + CXCR3 + CD4+ αβ T cell subsets. These findings show that RORC plays an integral role in both IL-17 and type II IFN pathways. JAK1: a complex immunodeficiency The JAK–STAT pathway is central to many signaling cascades. Of the four JAKs, JAK1 is involved in multiple signaling pathways including IL-2, IL-4, IL-7, IL-9, IL-15, IL-21, and IL-27 as well as the IL-6 and IL-10 families of cytokines 61 . As a result of JAK1’s widespread function, its deletion has been shown to be lethal in mice 62 . To date, only a single patient with partial JAK1 deficiency has been reported ( Table 1 ), resulting in a combined immunodeficiency complicated by atypical mycobacterial osteomyelitis, sinopulmonary and skin infections, flat warts, and severe crusted scabies 63 . Beyond infectious complications, the patient demonstrated developmental delay and an early death as a result of metastatic urothelial cancer at age 23. Functional studies demonstrated impaired JAK–STAT phosphorylation leading to compromised responses to multiple cytokines including IL-2 and type I and type II IFNs. These broad signaling defects are likely responsible for the T cell lymphopenia and viral and mycobacterial susceptibility, respectively. Recent insights gained from primary immunodeficiency disorders manifesting with viral infection susceptibility Novel primary immunodeficiency disorders of defective type I and III interferon signaling Patients with germline defects in antiviral immunity have been shown to suffer from disseminated infection when exposed to live viral vaccine strains 64 . Deficiencies in STAT1 65 , STAT2 66 , 67 , or IFNAR2 68 have been reported to predispose to severe infection from the live-attenuated measles, mumps, and rubella (MMR) vaccination strain. Shared among these disorders are important elements in the host antiviral response as mediated through type I (and type III) IFNs. Type I IFN signaling occurs via binding of the IFNAR, composed of two subunits, IFNAR1 and IFNAR2. IFNAR then activates JAK1 and TYK2, which phosphorylate STAT1 and STAT2. The resulting STAT1/STAT2 heterodimers translocate to the nucleus, where they assemble with IRF9 to form the IFN-stimulated gene factor 3 (ISGF3) complex, leading to the downstream transcription of IFN-stimulated genes (ISGs) responsible for antiviral host defense 69 . In a recent report, Hernandez et al . describe two patients with AR splice defects in IFNAR1 who experienced severe infectious complications following vaccination with MMR and yellow fever vaccine strains, respectively 70 . Patient cells demonstrated lack of IFNAR1 expression, unresponsiveness to type I IFN stimulation ( Table 1 ), and inability to control viral replication of measles and yellow fever viruses in vitro . Novel advances in the understanding of IFN signaling have also been illuminated by the study of three patients with AR LOF IRF9 mutations. A 5-year-old girl manifested severe influenza A virus (IAV) pneumonitis 71 , and a 10-year-old boy suffered from recurrent viral infections resulting in neurological impairment and bronchiectasis. A third patient, the 6-month-old sister of the 10-year-old boy, was healthy at the time of the report, potentially suggestive of incomplete penetrance 72 ( Table 1 ). Patient cells demonstrated normal STAT1 and STAT2 phosphorylation but were unable to form the necessary ISGF3 complex, resulting in impaired induction of ISGs and failure to control viral replication in vitro . Additional genetic evidence of influenza virus susceptibility comes from the recent description of three children with autosomal-dominant (AD) Toll-like receptor-3 (TLR3) deficiency complicated by IAV-induced acute respiratory distress syndrome 73 . TLR3 acts as an intracellular sensor of double-stranded DNA (dsDNA), and its activation stimulates type I and III IFN production 74 ( Table 1 ). Dominant-negative TLR3 mutations were initially recognized to cause defective intrinsic immunity of the central nervous system (CNS), impairing host IFN response to herpes simplex virus-1 (HSV-1) and underlying HSV encephalitis (HSE) in otherwise healthy children 75 . As previously described for dominant-negative TLR3 deficiency 75 , leukocytes from the patients with AD TLR3 deficiency demonstrated normal type I/III IFN activation. However, like patients with IRF9 71 or IRF7 deficiency 76 , fibroblasts and induced pluripotent stem cell-derived pulmonary epithelial cells (iPSC-PECs) failed to control IAV replication. Importantly, the phenotype could be rescued in iPSC-PECs when treated with IFN-α or IFN-λ1, highlighting the importance of intrinsic type I and III IFN immunity for viral control in the lung 73 . In addition to influenza, enteroviruses such as human rhinovirus (HRV) are major causes of respiratory viral infections, particularly in young children and immunocompromised adults 77 . In the induction of protection against these viruses, MDA5 senses long fragments of cytosolic dsDNA, leading to the production of type I IFNs and pro-inflammatory IL-1 family of cytokines 78 , 79 . Several LOF mutations in IFH1 , encoding MDA5, have been reported in patients suffering from severe respiratory viral infections 80 – 82 ( Table 1 ). These mutations impaired downstream IFN signaling and led to defective control of HRV replication in vitro 80 , 81 . Taken together, these data underscore the complex interplay found in host defense against a variety of viral pathogens and the crucial role that type I and III IFN signaling plays in the antiviral response. Novel defects of hyperactive immunity leading to viral infection-related morbidity Recurrent respiratory papillomatosis (RRP) is a rare disease resulting in recurrent benign papillomas of the respiratory mucosa in otherwise healthy children and is typically caused by chronic infection with human papilloma virus (HPV) serotypes 6 or 11 83 . Thus far, an immunologic etiology for this disease has remained unknown. Drutman et al . reported two brothers with juvenile-onset RRP who harbor a private homozygous NLRP1 mutation resulting in a GOF as demonstrated by increased IL-1β secretion and spontaneous inflammasome activation 84 ( Table 1 ). Interestingly, HPV6 or HPV11 was not detected in either patient, presumably because of an exaggerated antiviral response from inflammasome activation and inflammatory cytokine secretion. The cause of papilloma formation remains to be elucidated but may be secondary to the overproduction of inflammatory IL-1 family cytokines resulting in increased keratinocyte growth factor expression-mediated proliferation and papilloma formation 85 , 86 . Less than one percent of children with hepatitis A viral (HAV) infection develop acute liver failure (ALF), and although liver transplantation has significantly improved outcomes, mortality remains greater than 10% 87 – 89 . HAV replication alone does not result in hepatocellular injury; instead, non-HAV-specific “bystander-activated” CD8 + T cells have been implicated in hepatocyte cytotoxicity 90 . The mechanisms remain unclear, but evidence suggests that co-stimulation by type I IFNs and IL-18 results in potent T cell activation and IFN-γ secretion 91 , 92 . IL-18BP is important in the negative regulation of IFN-γ-mediated immune responses by binding IL-18 and preventing interaction with the IL-18 receptor. Belkaya et al . reported a child who succumbed to HAV-induced ALF as a result of AR IL-18BP deficiency, demonstrating that the mutant IL-18BP failed to block IL-18 activity 93 ( Table 1 ). Additionally, they provided important in vitro evidence that IL-18 mediates hepatotoxic effects via NK cell activation and cytotoxicity and that treatment with IL-18BP rescues the phenotype, indicating that recombinant IL-18BP may have therapeutic value in patients with ALF 93 . These reports emphasize the concept that unrestrained immune activation following viral infection may lead to serious clinical ramifications in patients with defects in immunoregulation or persistent inflammatory mediator production. Recent insights gained from PIDs manifesting with fungal infection susceptibility The mechanism of CARD9-dependent protection against central nervous system fungal invasion CARD9 deficiency has been known to result in fungal-specific infection susceptibility with a predilection for mucocutaneous tissues and the CNS 94 , 95 . The CNS-targeted susceptibility to Candida infection was recently elucidated. Specifically, CARD9 deficiency results in impaired recruitment of neutrophils into the Candida -infected CNS in mice and humans. The resultant CNS neutropenia, which is detrimental for control of fungal CNS invasion, is not due to peripheral neutropenia or impaired neutrophil-intrinsic chemotaxis but instead is caused by defective induction of critical pro-inflammatory molecules in the fungal-infected CNS that abrogate neutrophil trafficking from the blood into the CNS 96 . A recent follow-up study by Drummond et al . shed further light onto the cellular and molecular basis of the CNS neutrophil trafficking defect of CARD9 deficiency 97 . Specifically, it was shown that, in response to the fungal peptide toxin Candidalysin, CARD9 is critical in CNS-resident microglia for the production of IL-1β via both transcriptional regulation and inflammasome activation, which in turn activates the production of neutrophil-recruiting CXCL1 by CNS-resident microglia and astrocytes to promote fungal control in the CNS. Taken together, two-step tissue-specific “hits” are operational in CARD9 deficiency; impaired IL-17 responses at the mucosal level allow for Candida translocation into the blood and from there to the CNS, where impaired IL-1β/CXCL1-dependent crosstalk between resident microglia and recruited neutrophils results in CNS fungal persistence. Fungal mucosal immunity and connective tissue disorders CMC is manifested by superficial infections of the skin, nails, and mucous membranes caused by Candida species. As IL-17 is essential for antifungal mucosal immunity, inherited disorders underlying vulnerability to CMC are associated with impaired IL-17 signaling. Indeed, mutations in genes of the IL-17 signaling pathway, namely IL-17RA 98 , IL-17RC 99 , IL-17F 98 , and TRAF3IP2 100 , have been described in humans. Patients with AR AIRE deficiency resulting in autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy (APECED) 101 , 102 carry neutralizing autoantibodies against IL-17F and IL-22 103 , 104 . Other genetic disorders that lead to impaired T H 17 development include dominant-negative STAT3 mutations underlying Job’s syndrome 105 , DOCK8 deficiency 106 , the recently described deficiency in ZNF341 ( Table 1 ), a transcription factor that binds to the STAT3 promoter and results in defective STAT3 transcription and activity 107 , 108 , RORC deficiency 60 , and STAT1 GOF 109 , 110 . In a recent report, Li et al . described a three-generational family with AD CMC and an atypical connective tissue disorder (CTD) due to mitogen-activated protein kinase-8 (MAPK8) haploinsufficiency 111 . MAPK8 encodes JNK1, a central component in the MAPK signaling pathway important in the transduction of cellular responses within many contexts 112 , including transforming growth factor beta (TGF-β) signaling 113 and the IL-17A response pathway downstream of ACT1 100 . Evaluation of patient cells demonstrated reduced activation following IL-17A/F cytokine stimulation, impaired T H 17 differentiation, and reduced proportion of T H 17 cells in vitro 111 . Moreover, patient fibroblasts showed impaired JNK1-mediated phosphorylation of activator protein-1 (AP-1) following TGF-β stimulation. These findings suggest that JNK1 haploinsufficiency results in combined impairment of IL-17 and TGF-β cellular responses, resulting in CMC and CTD. Conclusion Research of PIDs provides an exciting opportunity to advance our understanding of human health. As technology continues to rapidly advance, so too does our sophistication in detecting subtle and once-unrecognized defects in the human immune response. As illustrated in the reviewed works above, certain defects may lend to a narrow range of infectious susceptibly often as a result of redundant host defense mechanisms selected throughout our evolution. 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Constantine Roles: Conceptualization, Data Curation, Writing – Original Draft Preparation, Writing – Review & Editing Michail S. Lionakis Roles: Conceptualization, Data Curation, Supervision, Writing – Original Draft Preparation, Writing – Review & Editing Competing interests No competing interests were disclosed. Grant information This work was supported by the Division of Intramural Research at National Institute of Allergy and Infectious Diseases (NIAID), National Institutes of Health (NIH). The content of this publication does not necessarily reflect the views or policies of the Department of Health and Human Services nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. Government. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Article Versions (1) version 1 Published: 07 Apr 2020, 9:243 https://doi.org/10.12688/f1000research.22036.1 Copyright © 2020 Constantine GM and Lionakis MS. This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The author(s) is/are employees of the US Government and therefore domestic copyright protection in USA does not apply to this work. The work may be protected under the copyright laws of other jurisdictions when used in those jurisdictions. Download Export To Sciwheel Bibtex EndNote ProCite Ref. Manager (RIS) Sente metrics Views Downloads F1000Research - - PubMed Central info_outline Data from PMC are received and updated monthly. - - Citations open_in_new 0 open_in_new 0 open_in_new SEE MORE DETAILS CITE how to cite this article Constantine GM and Lionakis MS. Recent advances in understanding inherited deficiencies in immunity to infections [version 1; peer review: 2 approved] . F1000Research 2020, 9 (F1000 Faculty Rev):243 ( https://doi.org/10.12688/f1000research.22036.1 ) NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS track receive updates on this article Track an article to receive email alerts on any updates to this article. TRACK THIS ARTICLE Share Open Peer Review Current Reviewer Status: Key to Reviewer Statuses VIEW HIDE Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. 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(for version 1) Comments on this article Comments (0) Version 1 VERSION 1 PUBLISHED 07 Apr 2020 ADD YOUR COMMENT Comment keyboard_arrow_left keyboard_arrow_right Open Peer Review Reviewer Status info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions Reviewer Reports Invited Reviewers 1 2 Version 1 07 Apr 20 Faculty Reviews are review articles written by the prestigious Members of Faculty Opinions . The articles are commissioned and peer reviewed before publication to ensure that the final, published version is comprehensive and accessible. 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Text is read by the "Ask this paper" AI Q&A widget below. Extraction quality varies by source — PMC NXML preserves structure cleanly, OA-HTML may include some navigation residue, and OA-PDF can have broken hyphenation. The publisher copy (via DOI) is the canonical version.

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Ask this paper AI returns verbatim quotes from the full text · source: preprint-html

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europepmc
last seen: 2026-05-19T01:45:01.086888+00:00
unpaywall
last seen: 2026-05-26T02:00:01.498150+00:00
License: CC-BY-4.0