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Immunol."],"abstract":"<jats:sec><jats:title>Background<\/jats:title><jats:p>Over the last decade, the identification of hypomorphic variants in patients previously diagnosed with Common Variable Immunodeficiency (CVID) has led to the association of milder phenotypes with variants of the <jats:italic>IL2RG<\/jats:italic> gene that are usually related to severe combined immunodeficiency. Indeed, several revertant mosaicisms have been described in cases with hypomorphic variants in that gene. Our main objective herein was the functional characterization of p. (Pro58Thr) variant in the <jats:italic>IL2RG<\/jats:italic> gene in an adult patient with antibody deficiency and moderate CD4<jats:sup>+<\/jats:sup> T cell lymphopenia.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Evaluation of the patient included a clinical examination and a complete analysis of the peripheral blood phenotype. To further explore <jats:italic>IL2RG<\/jats:italic> functionality we selected downstream signaling readouts, namely STAT3 and STAT5 phosphorylation, NK degranulation and B- and T-cell proliferation capacity <jats:italic>in vitro<\/jats:italic>, which can be measured by flow cytometry, that reflect the strength of homeostatic signaling pathways in resting cells and after activation.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The patient presented reduced CD132 expression and conserved T- and B-cell proliferation capacity <jats:italic>in vitro<\/jats:italic>. However, we found that intracellular signaling downstream of IL2\u03b3c is affected, with reduced STAT3 phosphorylation after IL-21 stimulation in B cells and CD4 T cells. In addition, CD4<jats:sup>+<\/jats:sup> T cells showed a reduced STAT5 phosphorylation in response to IL-2, which was not so evident in CD8<jats:sup>+<\/jats:sup> T cells. NK degranulation was impaired upon PHA and IL-2 as well as plasmablast differentiation <jats:italic>in vitro<\/jats:italic>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>We conclude that p. (Pro58Thr) in the <jats:italic>IL2RG<\/jats:italic> gene is functionally a hypomorphic variant, as reported previously. Although the functionality of CD8<jats:sup>+<\/jats:sup> is less impaired than the rest of the lymphocyte subsets, we did not detect a reversion of the variant in isolated CD8<jats:sup>+<\/jats:sup>, CD4<jats:sup>+<\/jats:sup>, CD19<jats:sup>+<\/jats:sup> or NK cells.<\/jats:p><\/jats:sec>","DOI":"10.3389\/fimmu.2025.1544863","type":"journal-article","created":{"date-parts":[[2025,3,18]],"date-time":"2025-03-18T07:01:40Z","timestamp":1742281300000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["Functional insights of an uncommon hypomorphic variant in IL2RG as a monogenic cause of CVID-like disease with antibody deficiency and T CD4 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