ArticleJournal of clinical immunology2026
Posttransplant B cell Development and Function in Patients with B cell Positive SCID Caused by Pathogenic Variants in IL2RG and JAK3.
Article in Journal of clinical immunology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Genetic defects in IL2RG or JAK3 can cause the phenotype of severe combined immunodeficiency (SCID) with absent T- and non-functional B-lymphocytes (T-B+ SCID). B cell function and the need for immunoglobulin replacement therapy after hematopoietic stem cell transplantation (HSCT) depends on the engraftment of donor B-lymphocytes. In a retrospective study we describe B-lymphocyte reconstitution after HSCT with the aim to identify B cell subpopulations as an early predictor for the maturation and function of B cells after HSCT. All patients included underwent HSCT in a single institution between 1980 and 2017. First, we studied B cell maturation in cryopreserved blood samples of 12 patients with B+ SCID (IL2RG-deficiency) after haploidentical HSCT presenting with mixed B cell chimerism. Recipient and donor B cell subpopulations were identified by HLA-staining using flow cytometry. In a consecutive step we compared B cell subpopulations irrespective of chimerism between patients with or without post-transplant B cell function. Samples for this study were obtained between day + 90 to + 250 after HSCT from 25 post-transplant long-term survivors with B-positive SCID (9 with genetic variants in JAK3, 16 in IL2RG), 9/25 were dependent and 16/25 independent of immunoglobulin (Ig) -substitution.We demonstrate that a proportion of less than 2% of donor B cells can be sufficient for posttransplant B cell function and that a proportion of more than 4.7% of switched memory (IgM-) B cells in the memory B cell population (CD19 + CD27+) between days + 90 and + 250 after HSCT correlates with normal B cell function and independence from immunoglobulin substitution.
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