Celiksoy, M. H.Topal, E.Yildiran, A.2024-08-042024-08-0420150301-05461578-1267https://doi.org/10.1016/j.aller.2014.06.007https://hdl.handle.net/11616/96970Background: Ataxia telangiectasia (A-T) is a genetic disorder caused by the homozygous mutation of the A-T mutated gene. It is frequently associated with variable degrees of cellular and humoral immunodeficiency. However, the immune defects in A-T patients are not well characterized. To the best of our knowledge, no studies have focused on the major lymphocyte subpopulations and recent thymic emigrants of A-T patients in comparison with age-matched healthy controls. Methods: Following the European Society for Immunodeficiencies criteria, 17 patients diagnosed with A-The, and 12 age-matched healthy children were assigned to the study. Both patients and healthy controls were grouped as 1-5, 6-10, 11-15, and 15+ years. By using a flow cytometer, major lymphocyte subpopulations and CD4+CD45RA+CD31+ recent thymic emigrants were determined as percentage and absolute cell numbers and compared. Results: No significant differences in all lymphocyte subpopulations were observed between the age groups of A-T patients. Compared to the healthy controls, there was a decrease in T cells, effector memory T4 cells, B cells, naive B cells, naive 14 cells, switched B cells, and recent thymic emigrants and an increase in active 18 cells and non-switched B cells in the percentage and absolute number of some cell populations in the A-T group. Conclusions: This study showed that effector functions in some cell lymphocyte populations were decreased in A-T patients. (C) 2014 SEICAP. Published by Elsevier Espana, S.L.U. All rights reserved.eninfo:eu-repo/semantics/closedAccessAtaxia-telangiectasiaCD31ImmunodeficiencyLymphocyte subpopulationPECAM-1Recent thymic emigrantsArticle4354774812545653210.1016/j.aller.2014.06.0072-s2.0-84940955315Q3WOS:000361503500010Q4