期刊
FRONTIERS IN IMMUNOLOGY
卷 12, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fimmu.2021.747738
关键词
CNS vasculopathy; meningoencephalitis; primary immunodeficiency; X-linked lymphoproliferative disease type 1; XLP1; multiple cerebral aneurysms
类别
X-linked lymphoproliferative disease (XLP1) is a combined immunodeficiency caused by mutations in the SH2D1A/SAP gene, leading to severe immune dysregulation, particularly in clearing Epstein-Barr-Virus (EBV) infections. Clinical manifestations range from life-threatening conditions like hemophagocytic lymphohistiocytosis (HLH) and infectious mononucleosis (FIM) to lymphoma and antibody deficiencies. Rare manifestations can include aplastic anemia and vasculitis.
X-linked lymphoproliferative disease (XLP1) is a combined immunodeficiency characterized by severe immune dysregulation caused by mutations in the SH2D1A/SAP gene. Loss or dysfunction of SH2D1A is associated with the inability in clearing Epstein-Barr-Virus (EBV) infections. Clinical manifestation is diverse and ranges from life-threatening hemophagocytic lymphohistiocytosis (HLH) and fulminant infectious mononucleosis (FIM) to lymphoma and antibody deficiency. Rare manifestations include aplastic anemia, chronic gastritis and vasculitis. Herein, we describe the case of a previously healthy eight-year old boy diagnosed with XLP1 presenting with acute non-EBV acute meningoencephalitis with thrombotic occlusive vasculopathy. The patient developed multiple cerebral aneurysms leading to repeated intracerebral hemorrhage and severe cerebral damage. Immunological examination was initiated after development of a susceptibility to infections with recurrent bronchitis and one episode of severe pneumonia and showed antibody deficiency with pronounced IgG1-3-4 subclass deficiency. We could identify a novel hemizygous SH2D1A point mutation affecting the start codon. Basal levels of SAP protein seemed to be detectable in CD8(+) and CD4(+) T- and CD56(+) NK-cells of the patient what indicated an incomplete absence of SAP. In conclusion, we could demonstrate a novel SH2D1A mutation leading to deficient SAP protein expression and a rare clinical phenotype of non-EBV associated acute meningoencephalitis with thrombotic occlusive vasculopathy.
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