Disease:Defects in PRF1 are the cause of familial hemophagocytic lymphohistiocytosis type 2 (FHL2) [MIM:603553]; also known as HPLH2. Familial hemophagocytic lymphohistiocytosis (FHL) is a genetically heterogeneous , rare autosomal recessive disorder. It is characterized by immune dysregulation with hypercytokinemia and defective natural killer cell function. The clinical features of the disease include fever , hepatosplenomegaly , cytopenia , hypertriglyceridemia , hypofibrinogenemia , and neurological abnormalities ranging from irritability and hypotonia to seizures , cranial nerve deficits , and ataxia. Hemophagocytosis is a prominent feature of the disease , and a non-malignant infiltration of macrophages and activated T lymphocytes in lymph nodes , spleen , and other organs is also found. ,Function:In the presence of calcium , perforin polymerizes into transmembrane tubules and is capable of lysing non-specifically a variety of target cells. ,induction:Repressed by contact with target cells. ,online information:Perforin entry ,online information:PRF1 mutation db ,similarity:Belongs to the complement C6/C7/C8/C9 family. ,similarity:Contains 1 C2 domain. ,similarity:Contains 1 EGF-like domain. ,similarity:Contains 1 MACPF domain. ,subcellular location:Cytoplasmic granules of cytolytic T-lymphocytes. ,
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