Heterogeneity in combined immunodeficiencies with associated or syndromic features (Review)
- Authors:
- Published online on: November 26, 2020 https://doi.org/10.3892/etm.2020.9517
- Article Number: 84
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Copyright: © Caba et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
Abstract
1. Introduction
Primary immunodeficiencies (PIDs) are rare, mostly monogenic genetic diseases that affect various components of the immune system and are characterized by pathological, clinical, and immunological diversity (1,2). The prevalence of PIDs is approximately 4-10 per 105 live births (3).
The International Union of Immunological Societies (IUIS) recognizes the existence of 430 entities and 408 different genes involved. It classifies diseases into 9 categories: Immunodeficiencies affecting cellular and humoral immunity, combined immunodeficiencies with associated or syndromic features, predominantly antibody deficiencies, diseases of immune dysregulation, congenital defects of phagocyte number or function, defects in intrinsic and innate immunity, autoinflammatory disorders, complement deficiencies and phenocopies of inborn errors of immunity (4-6). Of these, combined immunodeficiencies with associated or syndromic features present high heterogeneity manifested at the molecular and mutational level. Biological processes involve different gene expression products, ‘extraimmune’ clinical symptoms characteristic of each syndrome, and many diseases present incomplete penetrance and variable expressivity. This combined immunodeficiencies are classified into 10 types: Immunodeficiency with congenital thrombocytopenia; DNA repair defects (immunodeficiencies affecting cellular and humoral immunity); thymic defects with additional congenital anomalies; immuno-osseous dysplasias; hyper IgE syndromes (hyperimmunoglobulin E syndromes or HIES); dyskeratosis congenita (DKC), myelodysplasia, short telomeres; defects of vitamin B12 and folate metabolism; ectodermal anhidrotic dysplasia with immunodeficiency (EDA-ID); and calcium channel defects (4).
Correct and early diagnosis is necessary to prevent complications and reduce mortality (7). The molecular diagnosis can be followed by early protective and curative interventions, but also by avoiding the usual interventions which in the case of certain PIDs can bring additional complications (for example use of DNA-radiomimetic drugs in radiosensitive PIDs) (8). It is estimated that 70-90% of patients with PID remain undiagnosed worldwide (9). The onset can be at any age, but early onset correlates negatively with the severity of the manifestations (7). In many cases, patients are consulted for recurrent infections, but the etiological diagnosis is delayed. There are studies that show that in the US the etiological diagnosis is delayed by up to 12.4 years (10). During all this time, negative consequences can appear in personal, social and professional life, so that the quality of life is profoundly altered (3,7,11). In some cases, patients also have a predisposition to autoimmune diseases, autoinflammatory diseases or lymphoproliferative phenomena (4,8,12-16).
2. Molecular heterogeneity and biological processes
The vast majority of genes involved are genes that encode proteins. In combined immunodeficiencies with syndromic features a double heterogeneity is present: A specific protein presents multiple and diverse molecular functions while several different proteins have the same molecular function. Table I summarizes the molecular functions of these proteins and the biological processes in which they intervene according to UniProt Knowledgebase https://www.uniprot.org/ (4-6,17-23).
Table IHeterogeneity of molecular and biological processes in combined immunodeficiencies with associated or syndromic features (4-6,17,19-23). |
Some genes encode proteins that interact with chromatin, being implied in chromatin binding (DNMT3B, RNF168, POLE, STAT5B and KDM6A), chromatin DNA binding (STAT3, KDM6A) or chromatin regulation (CHD7, MYSM1, KMT2D and KDM6A) (23).
Other proteins interact with histones and allow histone binding (RNF168, MYSM1, WRAP53 and KMT2D), histone deacetylase binding (DNMT3B), histone demethylase activity [H3-K27 specific] (KDM6A) or histone methyltransferase activity [H3-K4 specific] (KMT2D and KMT2A) (23).
A major category is represented by genes that encode proteins implied in interaction with DNA: DNA binding (ZNF341, ATM, BLM, NFE2L2, DNMT3B, PMS2, POLE, POLE2, LIG1, ERCC6L2, TBX1, CHD7, FOXN1, MYSM1, STAT3, RTEL1, TERT, SP110 and KMT2D), DNA replication origin binding (MCM4), single-stranded DNA binding (BLM, MCM4, STN1 and CTC1), or damaged DNA binding (NBN, DCLRE1B/SNM1/APOLLO) (23).
Other genes encode transcription factors implied in RNA polymerase II activity (TBX1, FOXN1, STAT3, STAT5B, NFE2L2, KMT2A and BCL11B), DNA-binding transcription factor activity [ZBTB24, FOXN1, MYSM1, STAT3, SP110, STAT5B, KMT2D (MLL2), TBX1, ZNF341 and NFE2L2, BCL11B] or transcription factor binding (NBN, TBX1, STAT3 and NFKBIA) (23).
The functions of telomeres are regulated by other genes that influence telomeric DNA binding (TERT, TINF2, STN1 and CTC1), telomerase RNA binding (DKC1, NHP2, NOP10, TERT, PARN and WRAP53) or telomerase activity (TERT and DKC1) (23).
In addition, in immunodeficiencies different enzymatic activity may be disturbed: GTPase regulator activity (WAS), small GTPase binding (WAS), phospholipase binding (WAS), protein kinase binding (WAS, ERCC6L2, STAT3, PARN and IKBKB), DNA-dependent protein kinase activity (ATM), helicase (BLM, HELLS, MCM4, ERCC6L2, CHD7, SMARCAL1, RTEL1, SKIV2L), hydrolase (HELLS, PMS2, MCM4, POLE, ERCC6L2, CHD7, SMARCAL1, MYSM1, RTEL1, TPP1, DCLRE1B/SNM1/APOLLO, PARN and MTHFD1), nuclease (PMS2, POLE, DCLRE1B/SNM1/APOLLO and PARN), metalloprotease (MYSM1), phosphoglucomutase activity (PGM3), DNA polymerase binding (RTEL1) (23).
Another process that is perturbed in immunodeficiencies is ion binding and the main genes implied are TGFBR1, TGFBR2, ZNF341, DNMT3B, ZBTB24, RNF168, LIG1, MYSM1, EXTL3, RTEL1, TERT, TPP1, PARN, TCN2, IKBKG (NEMO), SP110, HOIL1 (RBCK1), RNF31, KMT2D (MLL2), KMT2D (MLL2), KDM6A, BCL11B, STIM1, FAT4 and CCBE1 (23).
The connection with RNA could be abnormal in immunodeficiencies because of an abnormal ribonucleoprotein (DKC1, NHP2, NOP10, TERT), RNA binding (DKC1, NHP2, NOP10 and WRAP53) or box H/ACA snoRNA binding (DKC1, NHP2 and NOP10) (23).
Other processes are disturbed because of gene mutations implied in protein binding (WAS, ATM, BLM, STAT3, TERT, IKBKB, WRAP53, IKBKG (NEMO), NFKBIA, ORAI1, STIM1, PNP, HOIL1, KDM6A,KMT2A and IL6ST), Rac GTPase (WAS), SH3 domain binding (WAS, WIPF1), profilin binding (WIPF1), ATP binding [IKBKB, TGFBR1, TGFBR2, ATM, BLM (RECQL3), HELLS, PMS2, MCM4, LIG1, ERCC6L2,SKIV2L, CHD7, SMARCAL1, RTEL1 and MTHFD1], chaperone binding (TERT and WRAP53), actin (actin filament) binding (WAS, WIPF1 and ARPC1B) (23).
Other genes, such as RMRP, RNU4ATAC or TERC, encode noncoding RNA (part of RNase MRP), small nuclear RNA and telomerase RNA component (Table I). Mutations in these genes cause alterations in processing of ribosomal RNA. RMRP gene mutations disturb mitochondrial DNA replication and cell cycle control. RNU4ATAC gene mutations produce defects of spliceosome complex. Mutations in the TERC gene are implied in dysfunctions of telomere length (19,22,24-26).
Genes including HELLS, TBX1, SEMA3E, FOXN1, CCBE1 or KDM6A encode proteins involved in development of one or more organs. The most illustrative example is the TBX1 gene that is involved in multiple biological processes: Angiogenesis, morphogenesis of cranial region, heart, parathyroid gland, pharyngeal system, soft palate, thymus or thyroid gland (23). Thus, deficiency in the TBX1 gene, characteristic to velo-cardio-facial syndrome, explains the association of abnormalities in multiple systems. The TBX1 gene allows thymus epithelium morphogenesis, lymphoid lineage cell migration into the thymus, regulation of positive thymic T cell selection and T cell homeostasis. Other developmental proteins are also involved in the genesis of various organs/components of the immune system. For example, the FOXN1 gene allows thymus epithelium morphogenesis, lymphoid lineage cell migration into the thymus, regulation of positive thymic T cell selection, T cell homeostasis and T cell lineage commitment (Table I) (19,22,24-26).
The pathogenic complexity of combined immunodeficiencies associated with syndromic features could be explained by the multiple interactions between the mentioned genes and important cell processes, such as the cell cycle, DNA damage, DNA repair process, DNA replication, apoptosis, transcription, cell division, multicellular organism development, ribosome biogenesis and processing, immune response, autophagy and cell adhesion. The pathophysiological mechanisms mainly involved are: Missing enzymes, absent or non-functional proteins, abnormal DNA repair, altered signal transduction, developmental arrest in immune differentiation, impairment of cell-to-cell and intracellular communications (Table I) (19,22,24-26).
3. Mutational heterogeneity
The majority of combined immunodeficiencies with syndromic features are monogenic diseases caused by mutations in a pair of nuclear genes and only few diseases are caused by chromosomal microdeletions.
Most mutations are loss-of-function (LOF) mutations with a recessive pattern of transmission. Other mutations produce a gain of function (GOF). GOF mutations are almost always dominant (27). In some situations, for the same gene, distinct missense mutations may cause either LOF or GOF. An example of this is the STAT3 gene (28). STAT3 LOF mutation causes Job syndrome while STAT3 GOF mutation causes a form of immunodeficiency characterized by an immune deregulation. Thus, in such situations it is absolutely necessary to perform genetic testing to detect the mutation and its effect on the protein (29). All of these can influence also the treatment strategy. In STAT3 GOF the efficient treatment includes monoclonal antibody (mAb) against IL-6R and HSCRT, while in STAT3 LOF the most efficient treatment is the long term use of antibiotics and humanized recombinant monoclonal against IgE (30-32).
4. Clinical heterogeneity and mode of inheritance
Clinical heterogeneity is even greater as in the case of combined immunodeficiencies with syndromic features when it presents an interindividual and interfamilial variable expressivity, in correlation with the type of mutation. In such cases, identification of a specific association of abnormalities allows an early diagnosis, sometimes even before the onset of immune manifestations (33). In the majority of cases, immunodeficiency clinical signs are not specific such as infections, skin inflammation, hematologic autoimmune/autoinflammatory disorders, and different types of malignancy. Thus discovery of a particular non-immune feature becomes very helpful for a precocious diagnosis (33-35).
Usually, the onset of disease occurs in childhood, but retarded manifestations could be found in the case of a hypomorphic mutations or a random X-chromosome inactivation in women heterozygote for a X-linked recessive mutation (33,36,37).
Infections observed in various primary immunodeficiency diseases can be bacterial, viral or fungal. Each infection has certain particularities. For example non-tuberculosis mycobacteria infections are found in IKBKG, IKBKB, GOF NFKBIA/IKBA deficiency; pyogenic pneumonia with pneumatocele formation and empyema/abscess and visceral abscess with S. aureus in childhood are specific for STAT3 deficiency; recurrent pyogenic sepsis is found in NEMO deficiency (33).
Viral infections with EBV (Epstein-Barr virus) and HHV8 (human herpes virus 8) - Kaposi sarcoma in young subjects are associated with STIM1 deficiency, AT (ATM), WAS (WASP), CHH (RMRP). Infection with HPV (human papilloma virus) with severe/recalcitrant warts, flat or verruca (often on trunk, face, neck, extremities, genital regions) are found in Netherton syndrome (SPINK5), WAS (WASP), NEMO deficiency (IKBKG), AT (ATM). Widespread molluscum contagiosum is associated with WAS, NEMO deficiency (IKBKG). Pneumonia with Pneumocystis jirovecii is present in WAS (WASP), NEMO deficiency (IKBKG), VODI (SP110), CARD11. Chronic mucocutaneous infection with Candida spp. is found in IKBG, IKBA, IKBB, NEMO deficiency, VODI (SP110) and infection with Aspergillus spp. is specific for STAT3 deficiency (33).
In combined immunodeficiencies, various inflammatory skin conditions are found: Generalized exfoliative erythroderma of infancy in Comèl-Netherton syndrome (SPINK5); diffuse early-onset eczema and erythroderma and muscle amylopectinosis in HOIL-1 deficiency; severe early-onset atopic eczema in WAS, Comèl-Netherton syndrome, PGM3, STAT5b deficiencies, STAT3 deficiency; congenital livedo in FILS syndrome (POLE) (33).
Autoimmune/autoinflammatory disorders associated with primary immunodeficiencies include organ-specific autoimmunity (in 22q deletion syndrome, WASP, ATM, STAT5B mutations). Global hematologic autoimmunity changes have been observed in 22q deletion syndrome, PNP, STIM1, ORAI1, WASP, ATM and STAT5B mutations while hematologic autoimmunity with non-virally induced lymphoproliferation have been associated with STIM1 deficiency, 22q11 deletion, 10p deletion. Other changes have been associated with sterile arthritis (WASP or STAT5B mutations); early-onset inflammatory bowel disease (WASP and IKBKG mutations); trichohepatoenteric syndrome-SKIV2L and TTC37 mutations, Veno-occlusive disease with immunodeficiency (VODI) SP110 mutations; early-onset diarrhea and malabsorption from ICF-Immunodeficiency-centromeric instability-facial anomalies syndrome determined by mutations in DNMTB3, ZBTB24, CDCA7 and HELLS genes) (33,38).
An increased risk of certain malignancies has been found in certain immunodeficiency syndromes. Various DNA repair deficiencies (ATM, NBN, LIG1) are associated with mainly lymphomas. MCM4 deficiency predisposes to EBV-associated lymphomas; Wiskott-Aldrich syndrome with myelodysplasia, leukemias and lymphomas. HHV8 is associated with primary Kaposi sarcoma (TNFRSF4, IFNGR1, WAS and STIM1); CHH (RMRP) with an increased risk of basal cell carcinoma and of EBV-associated lymphoproliferation (25,33,39-45).
In combined immunodeficiencies with syndromic features all type of monogenic transmission have been identified. Pedigree analysis is an easy-to-use tool available to any practitioner to establish this fact. However, some genetic phenomena, such as low frequency of the disease (some of the immunodeficiencies are extremely rare diseases), incomplete penetrance of the disease, variable expressivity and de novo mutations, can complicate the process of identification of the type of transmission. A special situation is the allelic heterogeneity encountered for example in the case of Kabuki syndrome (KS): KMT2D-related KS is inherited in an autosomal dominant manner while KDM6A-related KS is inherited in an X-linked manner (45). There is also the variant in which mutations in a gene determine a condition that can be transmitted differently; STAT5b deficiency can be transmitted in an autosomal recessive or in an autosomal dominant model (33).
5. Conclusion
In conclusion, recognizing heterogeneity and its sources is extremely important for current medical practice, but also for the theoretical value of improving biological and biomedical applications.
Acknowledgements
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Funding
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Availability of data and materials
All data and materials supporting the results of the present study are available in the published article and supported by relevant references.
Authors' contributions
All three authors contributed equally to preparing the review and the data search and collection. LC carried out the writing of the original draft preparation and CG carried out the writing, review and editing of the manuscript. EVG conducted the validation and supervision of the literature review and writing. All authors read and approved the final manuscript.
Ethics approval and consent to participate
Not applicable.
Patient consent for publication
Not applicable.
Competing interests
The authors declare that they have no competing interests.
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