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Errami A, El Baghdadi J, Ailal F, Benhsaien I, Ouazahrou K, Abel L, Casanova JL, Boisson-Dupuis S, Bustamante J, Bousfiha AA. Mendelian susceptibility to mycobacterial disease: an overview. EGYPTIAN JOURNAL OF MEDICAL HUMAN GENETICS 2023. [DOI: 10.1186/s43042-022-00358-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Abstract
Background
Mycobacteria include ubiquitous species of varying virulence. However, environmental and individual-specific factors, particularly host genetics, play a crucial role in the outcome of exposure to mycobacteria. The first molecular evidence of a monogenic predisposition to mycobacteria came from the study of Mendelian susceptibility to mycobacterial disease (MSMD), a rare inborn error of IFN-γ immunity conferring a selective susceptibility to infections even with low virulent mycobacteria, in patients, mostly children, without recognizable immune defects in routine tests. This article provides a global and updated description of the most important molecular, cellular, and clinical features of all known monogenic defects of MSMD.
Results
Over the last 20 years, 19 genes were found to be mutated in MSMD patients (IFNGR1, IFNGR2, IFNG, IL12RB1, IL12RB2, IL23R, IL12B, ISG15, USP18, ZNFX1, TBX21, STAT1, TYK2, IRF8, CYBB, JAK1, RORC, NEMO, and SPPL2A), and the allelic heterogeneity at these loci has led to the definition of 35 different genetic defects. Despite the clinical and genetic heterogeneity, almost all genetic etiologies of MSMD alter the interferon gamma (IFN-γ)-mediated immunity, by impairing or abolishing IFN-γ production or the response to this cytokine or both. It was proven that the human IFN-γ level is a quantitative trait that defines the outcome of mycobacterial infection.
Conclusion
The study of these monogenic defects contributes to understanding the molecular mechanism of mycobacterial infections in humans and to the development of new diagnostic and therapeutic approaches to improve care and prognosis. These discoveries also bridge the gap between the simple Mendelian inheritance and complex human genetics.
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Naik B, Ahmed SMQ, Laha S, Das SP. Genetic Susceptibility to Fungal Infections and Links to Human Ancestry. Front Genet 2021; 12:709315. [PMID: 34490039 PMCID: PMC8417537 DOI: 10.3389/fgene.2021.709315] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Accepted: 07/13/2021] [Indexed: 12/25/2022] Open
Abstract
Over the ages, fungi have associated with different parts of the human body and established symbiotic associations with their host. They are mostly commensal unless there are certain not so well-defined factors that trigger the conversion to a pathogenic state. Some of the factors that induce such transition can be dependent on the fungal species, environment, immunological status of the individual, and most importantly host genetics. In this review, we discuss the different aspects of how host genetics play a role in fungal infection since mutations in several genes make hosts susceptible to such infections. We evaluate how mutations modulate the key recognition between the pathogen associated molecular patterns (PAMP) and the host pattern recognition receptor (PRR) molecules. We discuss the polymorphisms in the genes of the immune system, the way it contributes toward some common fungal infections, and highlight how the immunological status of the host determines fungal recognition and cross-reactivity of some fungal antigens against human proteins that mimic them. We highlight the importance of single nucleotide polymorphisms (SNPs) that are associated with several of the receptor coding genes and discuss how it affects the signaling cascade post-infection, immune evasion, and autoimmune disorders. As part of personalized medicine, we need the application of next-generation techniques as a feasible option to incorporate an individual’s susceptibility toward invasive fungal infections based on predisposing factors. Finally, we discuss the importance of studying genomic ancestry and reveal how genetic differences between the human race are linked to variation in fungal disease susceptibility.
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Affiliation(s)
- Bharati Naik
- Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, India
| | - Sumayyah M Q Ahmed
- Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, India
| | - Suparna Laha
- Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, India
| | - Shankar Prasad Das
- Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangalore, India
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Taur PD, Gowri V, Pandrowala AA, Iyengar VV, Chougule A, Golwala Z, Chandak S, Agarwal R, Keni P, Dighe N, Bodhanwala M, Prabhu S, George B, Fouzia NA, Edison ES, Arunachalam AK, Madkaikar MR, Dalvi AD, Yadav RM, Bargir UA, Kambli PM, Rawat A, Das J, Joshi V, Pilania RK, Jindal AK, Bhat S, Bhattad S, Unni J, Radhakrishnan N, Raj R, Uppuluri R, Patel S, Lashkari HP, Aggarwal A, Kalra M, Udwadia Z, Bafna VS, Kanade T, Puel A, Bustamante J, Casanova JL, Desai MM. Clinical and Molecular Findings in Mendelian Susceptibility to Mycobacterial Diseases: Experience From India. Front Immunol 2021; 12:631298. [PMID: 33732252 PMCID: PMC7959731 DOI: 10.3389/fimmu.2021.631298] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Accepted: 02/02/2021] [Indexed: 01/26/2023] Open
Abstract
Mendelian Susceptibility to Mycobacterial diseases (MSMD) are a group of innate immune defects with more than 17 genes and 32 clinical phenotypes identified. Defects in the IFN-γ mediated immunity lead to an increased susceptibility to intracellular pathogens like mycobacteria including attenuated Mycobacterium bovis-Bacillus Calmette-Guérin (BCG) vaccine strains and non-tuberculous environmental mycobacteria (NTM), Salmonella, fungi, parasites like Leishmania and some viruses, in otherwise healthy individuals. Mutations in the IL12RB1 gene are the commonest genetic defects identified. This retrospective study reports the clinical, immunological, and molecular characteristics of a cohort of 55 MSMD patients from 10 centers across India. Mycobacterial infection was confirmed by GeneXpert, Histopathology, and acid fast bacilli staining. Immunological workup included lymphocyte subset analysis, Nitro blue tetrazolium (NBT) test, immunoglobulin levels, and flow-cytometric evaluation of the IFN-γ mediated immunity. Genetic analysis was done by next generation sequencing (NGS). Disseminated BCG-osis was the commonest presenting manifestation (82%) with a median age of presentation of 6 months due to the practice of BCG vaccination at birth. This was followed by infection with Salmonella and non-typhi Salmonella (13%), Cytomegalovirus (CMV) (11%), Candida (7%), NTM (4%), and Histoplasma (2%). Thirty-six percent of patients in cohort were infected by more than one organism. This study is the largest cohort of MSMD patients reported from India to the best of our knowledge and we highlight the importance of work up for IL-12/IL-23/ISG15/IFN-γ circuit in all patients with BCG-osis and suspected MSMD irrespective of age.
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Affiliation(s)
- Prasad D Taur
- Department of Immunology, B. J. Wadia Hospital for Children, Mumbai, India
| | - Vijaya Gowri
- Department of Immunology, B. J. Wadia Hospital for Children, Mumbai, India
| | | | | | - Akshaya Chougule
- Department of Immunology, B. J. Wadia Hospital for Children, Mumbai, India
| | - Zainab Golwala
- Department of Immunology, B. J. Wadia Hospital for Children, Mumbai, India
| | - Shraddha Chandak
- Department of Immunology, B. J. Wadia Hospital for Children, Mumbai, India
| | - Reepa Agarwal
- Department of Immunology, B. J. Wadia Hospital for Children, Mumbai, India
| | - Purva Keni
- Department of Immunology, B. J. Wadia Hospital for Children, Mumbai, India
| | - Neha Dighe
- Department of Immunology, B. J. Wadia Hospital for Children, Mumbai, India
| | - Minnie Bodhanwala
- Department of Immunology, B. J. Wadia Hospital for Children, Mumbai, India
| | - Shakuntala Prabhu
- Department of Immunology, B. J. Wadia Hospital for Children, Mumbai, India
| | - Biju George
- Department of Clinical Hematology, Christian Medical College, Vellore, India
| | - N A Fouzia
- Department of Clinical Hematology, Christian Medical College, Vellore, India
| | | | | | | | - Aparna Dhondi Dalvi
- Indian Council of Medical Research-National Institute of Immunohematology, Mumbai, India
| | - Reetika Malik Yadav
- Indian Council of Medical Research-National Institute of Immunohematology, Mumbai, India
| | - Umair Ahmed Bargir
- Indian Council of Medical Research-National Institute of Immunohematology, Mumbai, India
| | - Priyanka Madhav Kambli
- Indian Council of Medical Research-National Institute of Immunohematology, Mumbai, India
| | - Amit Rawat
- Department of Pediatrics, Advanced Pediatrics Centre, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Jhumki Das
- Department of Pediatrics, Advanced Pediatrics Centre, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Vibhu Joshi
- Department of Pediatrics, Advanced Pediatrics Centre, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Rakesh Kumar Pilania
- Department of Pediatrics, Advanced Pediatrics Centre, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Ankur Kumar Jindal
- Department of Pediatrics, Advanced Pediatrics Centre, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Sunil Bhat
- Mazumdar Shaw Cancer Centre, Narayana Health City, Bengaluru, India
| | | | | | | | | | | | | | | | - Amita Aggarwal
- Department of Clinical Immunology and Rheumatology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, India
| | | | | | | | | | - Anne Puel
- University of Paris, Institute Imagine, INSERM, Paris, France.,Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM UMR1163, Paris, France.,St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY, United States
| | - Jacinta Bustamante
- University of Paris, Institute Imagine, INSERM, Paris, France.,Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM UMR1163, Paris, France.,St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY, United States.,Study Center for Immunodeficiencies, Necker Hospital for Sick Children, AP-HP, Paris, France
| | - Jean Laurent Casanova
- University of Paris, Institute Imagine, INSERM, Paris, France.,Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM UMR1163, Paris, France.,St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY, United States.,Howard Hughes Medical Institute, New York, NY, United States
| | - Mukesh M Desai
- Department of Immunology, B. J. Wadia Hospital for Children, Mumbai, India
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