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Taghizadeh N, Mohammadi S, Abolhassani H, Shokri S, Nabavi M, Fallahpour M, Bemanian MH. From variant of uncertain significance to likely pathogenic in two siblings with atypical RAG2 Deficiency: a case report and review of the literature. BMC Pediatr 2024; 24:116. [PMID: 38350907 PMCID: PMC10863182 DOI: 10.1186/s12887-024-04597-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Accepted: 01/26/2024] [Indexed: 02/15/2024] Open
Abstract
BACKGROUND Severe combined immunodeficiencies (SCIDs) are hereditary disorders characterized by impaired T and B cell function, resulting in significant immune system dysfunction. Recombination-activating gene (RAG) mutations account for a substantial proportion of SCID cases. Here, we present two sibling cases of SCID caused by a novel RAG2 gene mutation. CASE PRESENTATION The index case was an 8-year-old boy who had a history of recurring infections. After a comprehensive immunological workup, the initial diagnosis of agammaglobulinemia was revised to combined immunodeficiency (CID). The patient underwent hematopoietic stem cell transplantation (HSCT) but succumbed to cytomegalovirus (CMV) infection. His brother, a 4-month-old boy, presented with CMV chorioretinitis. Leaky SCID was diagnosed based on genetic tests and immunological findings. The patient received appropriate treatment and was considered for HSCT. Both siblings had a homozygous RAG2 gene variant, with the first case classified as a variant of uncertain significance (VUS). The presence of the same mutation in the second brother, and the clinical phenotype, supports considering the mutation as likely pathogenic. CONCLUSIONS This case report highlights a novel RAG2 gene mutation associated with CID. The classification of a VUS may evolve with accumulating evidence, and additional studies are warranted to establish its pathogenicity. Proper communication between genetic counselors and immunologists, accurate documentation of patient information, increased public awareness, and precise utilization of genetic techniques are essential for optimal patient management.
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Affiliation(s)
- Nima Taghizadeh
- School of Medicine, Iran University of Medical Sciences (IUMS), Tehran, Iran
- Research Center for Immunodeficiencies, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Soha Mohammadi
- School of Medicine, Iran University of Medical Sciences (IUMS), Tehran, Iran
- Research Center for Immunodeficiencies, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Hassan Abolhassani
- Research Center for Immunodeficiencies, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
- Division of Immunology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Sima Shokri
- Department of Allergy and Clinical Immunology, School of Medicine, Iran University of Medical Sciences (IUMS), Rasool-e-Akram Hospital, Mansoori ave, Sattarkhan street, Tehran, 14456 13131, Iran.
| | - Mohammad Nabavi
- Department of Allergy and Clinical Immunology, School of Medicine, Iran University of Medical Sciences (IUMS), Rasool-e-Akram Hospital, Mansoori ave, Sattarkhan street, Tehran, 14456 13131, Iran
| | - Morteza Fallahpour
- Department of Allergy and Clinical Immunology, School of Medicine, Iran University of Medical Sciences (IUMS), Rasool-e-Akram Hospital, Mansoori ave, Sattarkhan street, Tehran, 14456 13131, Iran
| | - Mohammad Hassan Bemanian
- Department of Allergy and Clinical Immunology, School of Medicine, Iran University of Medical Sciences (IUMS), Rasool-e-Akram Hospital, Mansoori ave, Sattarkhan street, Tehran, 14456 13131, Iran
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