hemophagocytic lymphohistiocytosis, familial, type 4
hemophagocytic lymphohistiocytosis, familial, type 4
A rare autosomal recessive disorder (OMIM:603552) characterised by immune dysregulation with hypercytokinaemia, defective NK cell activity, and massive infiltration of several organs by activated lymphocytes and macrophages.Clinical findings
Fever, hepatosplenomegaly, cytopenias, hypertriglyceridemia, hypofibrinogenaemia; less commmonly, neurologic defects ranging from irritability and hypotonia to seizures, cranial nerve deficits and ataxia.
Molecular pathology
Caused by defects in STX11, which encodes a protein that plays a role in the targeting and fusion of intracellular transport vesicles.