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A Case Report of IPEX Syndrome with Neonatal Diabetes Mellitus and Congenital Hypothyroidism as the Initial Presentation, and a Systematic Review of neonatal IPEX.
Journal of Clinical Immunology 2023 March 4
Immune dysregulation, polyendocrinopathy, enteropathy, X-linked syndrome (IPEX) is a serious disorder, which may comprise diabetes, thyroid disease, enteropathy, cytopenias, eczema, and other multi-system autoimmune dysfunction features. IPEX syndrome is caused by mutations in the forkhead box P3 (FOXP3) gene. Here, we report the clinical manifestations of a patient with IPEX syndrome onset in the neonatal period. A de novo mutation at exon 11 of the FOXP3 gene (c.1190G > A, p.R397Q) was found, and its main clinical manifestations included hyperglycemia and hypothyroidism. Subsequently, we comprehensively reviewed the clinical characteristics and FOXP3 mutations of 55 reported neonatal IPEX cases. The most frequent clinical presentation included symptoms of gastrointestinal involvement (n = 51, 92.7%), followed by skin-related symptoms (n = 37, 67.3%), diabetes mellitus (DM) (n = 33, 60.0%), elevated IgE (n = 28, 50.9%), hematological abnormality (n = 23, 41.8%), thyroid dysfunction (n = 18, 32.7%), and kidney-related symptoms (n = 13, 23.6%). In total, 38 variants were observed in the 55 neonatal patients. The most frequent mutation was c.1150G > A (n = 6; 10.9%), followed by c.1189C > T (n = 4; 7.3%), c.816 + 5G > A (n = 3; 5.5%), and C.1015C > G (n = 3; 5.5%), which were reported more than twice. The genotype-phenotype relationship showed that the repressor domain mutations were associated with DM (P = 0.020), and the leucine zipper mutations were associated with nephrotic syndrome (P = 0.020). The survival analysis suggested that treatment with glucocorticoids increased the survival of the neonatal patients. This literature review provides an informative reference for the diagnosis and treatment of IPEX syndrome in the neonatal period.
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