Abstract
Kabuki Syndrome (KS) is a multisystemic genetic disorder. A portion of patients has immunological manifestations characterized by increased susceptibility to infections and autoimmunity. Aiming to describe the clinical and laboratory immunological aspects of KS, we conducted a retrospective multicenter observational study on patients with KS treated in centers affiliated to the Italian Primary Immunodeficiency Network.
Thirty-nine patients were enrolled, with a median age at evaluation of 10 years (range: 3 m–21y). All individuals had organ malformations of variable severity. Congenital heart defect (CHD) was present in 19/39 patients (49%) and required surgical correction in 9/39 (23%), with associated thymectomy in 7/39 (18%). Autoimmune cytopenia occurred in 6/39 patients (15%) and was significantly correlated with thymectomy (p < 0.002), but not CHD. Individuals with cytopenia treated with mycophenolate as long-term immunomodulatory treatment (n = 4) showed complete response. Increased susceptibility to infections was observed in 22/32 patients (69%). IgG, IgA, and IgM were low in 13/29 (45%), 13/30 (43%) and 4/29 (14%) patients, respectively. Immunoglobulin substitution was required in three patients. Lymphocyte subsets were normal in all patients except for reduced naïve T-cells in 3/15 patients (20%) and reduced memory switched B-cells in 3/17 patients (18%). Elevated CD3 + TCRαβ + CD4-CD8-T-cells were present in 5/17 individuals (23%) and were correlated with hematological and overall autoimmunity (p < 0.05).
In conclusion, immunological manifestations of KS in our cohort include susceptibility to infections, antibody deficiency, and autoimmunity. Autoimmune cytopenia is correlated with thymectomy and elevated CD3 + TCRαβ + CD4-CD8-T-cells, and benefits from treatment with mycophenolate.
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The datasets generated and analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We thank Fondazione Città della Speranza ONLUS (http://cittadellasperanza.org), Associazione di Promozione Sociale “Genitori in fuga” (https://www.genitoriinfuga.org) for their support to our scientific work. We would like to thank the patients, the patients’ families, and the nurses for their collaboration and efforts.
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AMar and MCP conceived and designed the study on behalf of the IPINet. SR, DMo, CA, EG, MT, FC, AP, FS, SN, EV, AMag, LB, SA, RC, LL, IDA, RR, DMe, SS, ECi, GG, AB, CP, AMar collected the data and treated the patients. Data analysis was performed by LR, AMar and ECa. The manuscript was written by AMar and LR with contributions from all authors. All authors read and approved the final manuscript.
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Rossini, L., Ricci, S., Montin, D. et al. Immunological Aspects of Kabuki Syndrome: A Retrospective Multicenter Study of the Italian Primary Immunodeficiency Network (IPINet). J Clin Immunol 44, 105 (2024). https://doi.org/10.1007/s10875-024-01676-y
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DOI: https://doi.org/10.1007/s10875-024-01676-y