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Human Inborn Errors of Immunity: 2019 Update on the Classification from the International Union of Immunological Societies Expert Committee

Journal of Clinical Immunology volume 40, pages 24–64 (2020)Cite this article

A Publisher Correction to this article was published on 01 January 2020

This article has been updated

Abstract

We report the updated classification of Inborn Errors of Immunity/Primary Immunodeficiencies, compiled by the International Union of Immunological Societies Expert Committee. This report documents the key clinical and laboratory features of 430 inborn errors of immunity, including 64 gene defects that have either been discovered in the past 2 years since the previous update (published January 2018) or were characterized earlier but have since been confirmed or expanded upon in subsequent studies. The application of next-generation sequencing continues to expedite the rapid identification of novel gene defects, rare or common; broaden the immunological and clinical phenotypes of conditions arising from known gene defects and even known variants; and implement gene-specific therapies. These advances are contributing to greater understanding of the molecular, cellular, and immunological mechanisms of disease, thereby enhancing immunological knowledge while improving the management of patients and their families. This report serves as a valuable resource for the molecular diagnosis of individuals with heritable immunological disorders and also for the scientific dissection of cellular and molecular mechanisms underlying inborn errors of immunity and related human diseases.

Inborn errors of immunity, also referred to as primary immunodeficiencies, manifest as increased susceptibility to infectious diseases, autoimmunity, autoinflammatory diseases, allergy, and/or malignancy. These conditions are caused by monogenic germline mutations that result in loss of expression, loss-of-function (LOF; amorphic/hypomorphic), or gain-of-function (GOF; hypermorphic) of the encoded protein [1, 2]. Heterozygous lesions may underlie autosomal dominant traits by GOF, haploinsufficiency, or negative dominance. Biallelic lesions typically cause autosomal recessive traits by LOF of the encoded protein (rarely GOF), while X-linked recessive traits arise from LOF of genes on the X chromosome, either in the hemizygous state in males or in the homozygous state in females. Rare X-linked dominant traits can also arise from LOF or GOF variants. This results in aberrant immunity due to the critical roles of these proteins in the development, maintenance and function of cells of the immune system, or cells other than leukocytes that contribute to immunity, during homeostasis and in response to external (e.g., infectious agents or environmental antigens) and internal (e.g., cytokines, self-antigens and cancer cells) stimuli [3,4,5]. Inborn errors of immunity were traditionally considered to be rare diseases, affecting ~ 1 in 10,000 to 1 in 50,000 births. However, with ongoing discovery of novel inborn errors of immunity (Fig. 1a) and improved definition of clinical phenotypes [6,7,8], the collective prevalence of these conditions is more likely to be at least 1/1000–1/5000 [9]. Indeed, more common inborn errors have recently been described [10]. Regardless of their exact incidence and prevalence, inborn errors of immunity represent an unprecedented model to link defined monogenic defects with clinical phenotypes of immune dysregulation, in a broad sense of the term. As a committee, we are aware that human immunity involves cells other than circulating or tissue leukocytes and that it can be scaled up from the immune system to the whole organism. Inborn errors of immunity have unequivocally revealed non-redundant roles of single genes and their products in immune function [3, 4, 6,7,8], formed the basis of improved mechanism-based therapies for the immunopathology underlying many diseases [8, 11], established immunological paradigms representing the foundations of basic, clinical and translational immunology [3,4,5, 9, 12,13,14], and provided insights into the molecular pathogenesis of more common diseases [9, 15]. Clear examples of these include:

  • The initial description by Bruton of X-linked agammaglobulinemia (XLA) and the ability to treat this condition with antibody replacement therapy (the mainstay treatment for antibody deficiency diseases such as CVID) [16]

  • The discovery of mutations in BTK [12] and the subsequent development of BTK-inhibitors such as ibrutinib for the treatment of B cell malignancies [14]

  • Progressive CD4 T cell deficiency explains opportunistic infections secondary to HIV infection [9].

Fig. 1
figure 1

Rate of discovery of novel inborn errors of immunity: 1983–2019. a The number of genetic defects underlying monogenic immune disorders as reported by the IUIS/WHO committee in the indicated year. b The number of pathogenic gene variants listed in each table by the IUIS committee. Report published in 2017, and the number of new genes for each table contained in this report (red bars). The numbers in each column correspond to the number of genes reported in the 2017 IUIS update (blue bars) [1, 2], the number of new genes for each table contained in this report (red bars), and the total number of genes for each table. Note: only data for Tables 1, 2, 3, 4, 5, 6, 7, and 8 are shown, because Table 9 (bone marrow failure) is a new addition to the current report.

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Thus, the study of inborn errors of immunity has provided profound advances in the practice of precision molecular medicine.

Since the early 1950s, when XLA was one of the first primary immune deficiencies to be described [16], clinical immunology has leveraged advances in the development of new methods to expedite the identification of defects of the immune system and the cellular, molecular, and genetic aberrations underlying these conditions. Indeed, the completion of the Human Genome Project in the early 2000s, coupled with rapid developments in next generation DNA sequencing (NGS) technologies, enabled the application of cost-effective and time-efficient sequencing of targeted gene panels, whole exomes, or whole genomes to cohorts of patients suspected of having a monogenic explanation for their disease. These platforms have led to a quantum leap in the identification and diagnosis of previously undefined genetically determined defects of the immune system (Fig. 1a, b; [6,7,8]).

The International Union of Immunological Societies Expert Committee of Inborn Errors of Immunity comprises pediatric and adult clinical immunologists, clinician/scientists and researchers in basic immunology from across the globe (https://iuis.org/committees/iei/). A major objective and responsibility of the committee is to provide the clinical and research communities with an update of genetic causes of immune deficiency and dysregulation. The committee has existed since 1970 and has published an updated report approximately every 2 years to inform the field of these advances (Fig. 1a). In March 2019, the committee met in New York to discuss and debate the inclusion of genetic variants published over the preceding 2 years (since June 2017) [1, 2], as well as gene mutations that had appeared in the literature earlier but, based on newly available evidence, were now substantiated (Fig. 1b).

Rather than simply including every gene variant reported, the committee applies very stringent criteria such that only those genes with convincing evidence of disease pathogenicity are classified as causes of novel inborn errors of immunity [17]. The Committee makes informed judgments for including new genetic causes of immunological conditions based on what we believe is most useful for practitioners caring for patients. Our current, and continuously evolving, practice is that criteria for inclusion can be met by several ways, for instance peer-reviewed publication of (1) multiple cases from unrelated kindreds, including detailed immunologic data, or (2) very few cases, or even a single case (see below), for whom compelling mechanistic/pathogenic data is also provided, generally from parallel studies in an animal or cell culture model.

Herein, we provide this latest update. The inborn errors of immunity are listed in 10 tables: Combined immunodeficiencies (Table 1), Combined immunodeficiencies with syndromic features (Table 2), Predominantly antibody deficiencies (Table 3), Diseases of immune dysregulation (Table 4), Congenital defects of phagocytes (Table 5), Defects in intrinsic and innate immunity (Table 6), Autoinflammatory diseases (Table 7), Complement deficiencies (Table 8), and Phenocopies of inborn errors of immunity (Table 10) (Fig. 1b). Since the last update (published January 2018) [1, 2], we have added a new table to consolidate genes that cause bone marrow failure (Table 9). Our division into phenotypes does not imply that the presentation is homogeneous. Rather, we recognize that substantial phenotypic and clinical heterogeneity exists within groups of patients with mutations in the same gene and even between individuals from the same pedigree with the identical gene mutation. To simplify the classification, each disorder has been listed only once, although distinct disorders due to mutations in the same gene, but with different modes of inheritance and pathogenic mechanisms are listed individually. Thus, several genes appear more than once in this update (some examples are listed below). Sub-divisions within each table segregate groups of disorders into coherent phenotypic sets. OMIM numbers are also provided within each table. If a OMIM number has not yet been issued for a particular genetic condition, then the number provided generally refers to the OMIM for that gene. Beneath each table, the new disorders added to this update are highlighted for easy reference.

Table 1 Immunodeficiencies affecting cellular and humoral immunity
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Table 2 Combined immunodeficiencies with associated or syndromic features
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Table 3 Predominantly antibody deficiencies
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Table 4 Diseases of immune dysregulation
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Table 5 Congenital defects of phagocyte number or function
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Table 6 Defects in intrinsic and innate immunity
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Table 7 Autoinflammatory disorders
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Table 8 Complement deficiencies
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Table 9 Bone marrow failure
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Table 10 Phenocopies of inborn errors of immunity
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The advances in our understanding of clinical immunology continue to expand at a vast and remarkable rate, with the addition in this update of many—64, distributed across all tables (Fig. 1b)—novel genetic defects underlying inborn errors of immunity. Perhaps not surprisingly, most if not all of these new variants were identified by NGS, thus highlighting that whole exome/whole genome sequencing has become the gold standard for identifying novel pathogenic gene variants [6,7,8]. Indeed, since the first application of NGS to identify novel inborn errors of immunity was published in 2010 [18], ~ 45% of all currently known disease-causing variants have been discovered by whole exome/genome sequencing. Thus, a typical approach to identifying a pathogenic variant in a new patient might now consist of first sequencing a phenotype-driven panel of genes and advancing to whole exome/genome sequencing if the cause of disease remains elusive.

In this update, we increase the list of immunological diseases to 404, with 430 known genetic defects identified as causing these conditions. The unbiased application of NGS to the discovery and characterization of novel inborn errors of immunity continues to inform clinical and basic immunology. Thus, additional phenotypes have been identified for conditions resulting from variants in known and novel genes; the penetrance of genetic variants on clinical phenotypes has been shown to be highly variable; and clinical entities sharing common phenotypes have been discovered. For example, this update includes the findings that bi-allelic mutations in ZNF341 [19, 20], IL6ST (encoding gp130, a common component of the receptors for IL-6, IL-11, IL-27, LIF, OSM, CNTF) [21, 22], or IL6R [23, 24] all cause conditions that resemble autosomal dominant hyper-IgE syndrome due to dominant negative mutations in STAT3 [15]. Detailed analyses of these patients revealed a novel mechanism of regulating STAT3 signaling (via the transcription factor ZNF341) and defined the exact consequences of impaired IL-6/IL-6R/gp130 and putatively IL-11/IL-11R/gp130 signaling to the phenotype of AD-HIES.

Furthermore, key findings over the past 2 years continue to reveal that distinct mechanisms of disease (GOF, LOF, dominant negative, haploinsufficient), as well as different modes of inheritance (autosomal recessive, autosomal dominant) of variants in the same gene can cause disparate clinical conditions. This is a fascinating aspect of the genetics of human disease, and a salient reminder to be cognizant of the nature of the genetic variants identified from NGS. It is these genes that have several entries in this update. A few recent examples include:

  1. 1.

    Heterozygous variants in CARD11 [25, 26] or STAT5B [27] can be pathogenic due to negative dominance. This was potentially unexpected because autosomal recessive LOF variants in both of these genes were previously reported to cause combined immunodeficiency and severe immune dysregulation, respectively, yet heterozygous relatives of these affected individuals were healthy [28, 29].

  2. 2.

    While heterozygous dominant negative mutations in TCF3, encoding the transcription factor E47, cause B cell deficiency and agammaglobulinemia [30], nonsense mutations in TCF3 have now been identified that are pathogenic only in an autosomal recessive state, as heterozygous carriers of these particular allelic variants remained healthy [31, 32].

  3. 3.

    A heterozygous hypermorphic variant in IKBKB was found to cause a combined immunodeficiency [33] not too dissimilar to the original description of bi-allelic, recessive variants in IKBKB [34]. Similarly, bi-allelic LOF mutations in PIK3CD are now known to cause B cell deficiency and agammaglobulinemia [35–37], which is quite distinct from the immune dysregulated state of individuals with monoallelic activating PIK3CD mutations [1, 37]. This observation nicely parallels the earlier findings of either homozygous or heterozygous mutations in PIK3R1 that clinically phenocopy recessive or activating mutations in PIK3CD respectively [1, 37].

  4. 4.

    Distinct diseases can result from heterozygous mutations in IKZF1 (Ikaros): combined immunodeficiency due to dominant negative alleles [38] or CVID due to haploinsufficiency [39].

  5. 5.

    Similar to STAT1 [40], variants in RAC2 [41,42,43,44,45] or CARD11 [25, 26, 28] can be pathogenic either as monoallelic GOF or LOF or bi-allelic recessive LOF.

Thus, these findings have revealed the fundamental importance of elucidating the impact of a novel variant on the function of the encoded protein and thus the mechanism of pathogenicity. Furthermore, these new entries are an important reminder not to overlook the potential significance of identifying heterozygous variants in genes previously believed to cause disease only in a biallelic manner or to result in a previously defined specific clinical entity. Indeed, there are now at least 35 genes that have multiple entries in the current update, reflecting the distinct mechanisms by which variants result in or cause disease (e.g., STAT1, STAT3, NLRP1, RAC2, ZAP70, CARD11, IKBKB, WAS, JAK1, IFIH1, C3, C1R, C1S–GOF or LOF; STAT5, STAT1, CARD11, ACD, CFH, CFHR1–5, FOXN1, RAC2, TCF3, AICDA, PIK3R1, IFNGR1, TREX1, TICAM1, IRF8–AD or AR; PIK3CD–AD GOF, AR LOF; IKZF1–AD, or haploinsufficient; NLRP3—distinct disease phenotypes despite all resulting from GOF alleles).

As noted above, genetic, biochemical, and functional analyses of putative novel pathogenic variants need to meet stringent criteria to be considered for inclusion in this update [17]. These criteria can make reporting genetic findings from single cases challenging, as often the best evidence that a novel variant is disease-causing is to identify additional, similarly affected but unrelated individuals with the same variants, or functionally similar variants in the same gene. While this can be challenging, particularly in light of the rarity of individual inborn errors of immunity, robust mechanistic laboratory investigations continue to provide compelling data from single patients, with or without evidence from animal models. Specifically, homozygous LOF mutations in IRF9 [46] and IL18BP [47] were identified and rigorously characterized in single patients and found to be the molecular cause of life-threatening influenza and fulminant viral hepatitis, respectively.

The study and discovery of novel inborn errors of immunity can also enable improved patient management by implementing gene-specific targeted therapies. Thus, JAK inhibitors are being used to treat disorders of immune dysregulation resulting from GOF mutations in JAK1, STAT1 or STAT3 [11], while mTOR inhibitors such as rapamycin or PI3K p110δ-specific inhibitors have been reported for the treatment of individuals with PIK3CD GOF or PIK3R1 LOF mutations [37]. Regarding novel gene defects, immune dysregulation due to DEF6 deficiency was successfully treated with abatacept (CTLA4-Ig) [48]. This correlated with impaired CTLA4 expression and function in DEF6-deficient T cells [48] and parallels the therapeutic use of abatacept and belatacept for LRBA-deficiency and CTLA4 haploinsufficiency, both of which are characterized by reduced CTLA4 expression in affected regulatory T cells [49, 50]. From a theoretical perspective, the finding that MSMD can be caused by mutations in IL12RB2, IL23R or SPPL2A and that these mutations are associated with impaired production of IFNγ—a requisite of anti-mycobacterial immunity—implies that IFNγ administration could be therapeutically beneficial in these clinical settings [51, 52]. Similarly, recombinant IL18BP could potentially ameliorate viral-induced liver toxicity due to IL18BP deficiency [47].

The goals of the IUIS Expert Committee on Inborn Errors of Immunity are to increase awareness, facilitate recognition, promote optimal treatment, and support research in the field of disorders of immunity. Thus, this 2019 Update and the accompanying “Phenotypical IUIS Classification” publications are intended as resources for clinicians and researchers. Importantly, these tables underpin the design of panels used for targeted gene sequencing to facilitate genetic diagnoses or inborn errors. In the past 5 years, the number of gene defects underlying inborn errors of immunity has nearly doubled from ~ 250 to 430 (Fig. 1a). The human genome contains 1800–2000 genes that are known to be involved in immune responses [13]. Thus, the discovery and study of inborn errors of immunity has elegantly illustrated that > 20% of these immune genes play non-redundant roles in host defense and immune regulation. With the improved identification and phenotyping of patients with rare diseases, combined with high throughput genome sequencing, the number of genes fundamentally required for immunity will no doubt continue to increase, further revealing critical and novel roles for specific genes, molecules, pathways and cell types in immune responses, as well as mechanisms of disease pathogenesis and targets for immunotherapies. The field of inborn errors of immunity, and the global clinical and research communities, will therefore continue to provide key insights into basic and clinical immunology.

Change history

  • 22 February 2020

    The original version of this article unfortunately contained mistakes in reference numbers. The in-text citations and the references were mismatched. The original article has been corrected.

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Acknowledgments

The members of the Inborn Errors of Immunity committee would like to thanks the International Union of Immunological Societies (IUIS) for funding, as well as CSL Behring, Baxalta and Shire/Takeda for providing educational grants to enable us to compile this classification update.

Author information

Affiliations

  1. Garvan Institute of Medical Research, Darlinghurst, Sydney, NSW, 2010, Australia

    Stuart G. Tangye

  2. Faculty of Medicine, St Vincent’s Clinical School, UNSW, Sydney, NSW, Australia

    Stuart G. Tangye

  3. Department of Pediatrics, Faculty of Medicine, Kuwait University, Kuwait City, Kuwait

    Waleed Al-Herz

  4. King Hassan II University, Laboratoire d’Immunologie Clinique, d’Inflammation et d’Allergy LICIA at Faculty of Medicine and Pharmacy, Clinical Immunology Unit, Pediatric Infectiouse Disease Department, Children’s Hospital, Ibn Rochd University Hospital, Casablanca, Morocco

    Aziz Bousfiha

  5. Division of Immunology, Children’s Hospital Boston, Boston, MA, USA

    Talal Chatila

  6. Departments of Medicine and Pediatrics, Mount Sinai School of Medicine, New York, NY, USA

    Charlotte Cunningham-Rundles

  7. Ruth’s Children’s Hospital-Technion, Haifa, Israel

    Amos Etzioni

  8. Grupo de Inmunodeficiencias Primarias, Facultad de Medicina, Universidad de Antioquia UdeA, Medellin, Colombia

    Jose Luis Franco

  9. Laboratory of Clinical Immunology & Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA

    Steven M. Holland

  10. Dr von Hauner Children’s Hospital, Ludwig-Maximilians-University Munich, Munich, Germany

    Christoph Klein

  11. Department of Pediatrics and Developmental Biology, Tokyo Medical and Dental University (TMDU), Tokyo, Japan

    Tomohiro Morio

  12. Department of Pediatrics, University of Washington and Seattle Children’s Research Institute, Seattle, WA, USA

    Hans D. Ochs & Troy R. Torgerson

  13. Department of Clinical Immunology, Hôpital Saint-Louis, APHP, University Paris Diderot, Sorbonne Paris Cité, Paris, France

    Eric Oksenhendler

  14. Study Center for Primary Immunodeficiencies, Necker Hospital for Sick Children, APHP, Paris, France

    Capucine Picard

  15. Paris University, Laboratory of Lymphocyte Activation and Susceptibility to EBV, INSERM UMR1163, Imagine Institute, Necker Hospital for Sick Children, Paris, France

    Capucine Picard

  16. Department of Pediatrics, University of California San Francisco and UCSF Benioff Children’s Hospital, San Francisco, CA, USA

    Jennifer Puck

  17. St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY, USA

    Jean-Laurent Casanova

  18. Howard Hughes Medical Institute, New York, NY, USA

    Jean-Laurent Casanova

  19. Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM UMR1163, Imagine Institute, Necker Hospital for Sick Children, Paris University, Paris, France

    Jean-Laurent Casanova

  20. Pediatric Hematology-Immunology Unit, Necker Hospital for Sick Children, Assistance Publique-Hôpitaux de Paris (APHP), Paris, France

    Jean-Laurent Casanova

  21. Division of Allergy Immunology, Department of Pediatrics, The Children’s Hospital of Philadelphia, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA

    Kathleen E. Sullivan

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  1. Stuart G. Tangye
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Tangye, S.G., Al-Herz, W., Bousfiha, A. et al. Human Inborn Errors of Immunity: 2019 Update on the Classification from the International Union of Immunological Societies Expert Committee. J Clin Immunol 40, 24–64 (2020). https://doi.org/10.1007/s10875-019-00737-x

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  • DOI: https://doi.org/10.1007/s10875-019-00737-x

Keywords

  • IUIS
  • primary immune deficiency
  • inborn errors of immunity
  • immune dysregulation
  • autoinflammatory disorders
  • next-generation sequencing