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• W2108697946 abstract "<h3>Background:</h3> <i>PRF1</i> gene mutations are associated with familial haemophagocytic lymphohistiocytosis type 2 (FHL2). Genotype–phenotype analysis, previously hampered by limited numbers of patients, was for the first time performed by data pooling from five large centres worldwide. <h3>Patients and methods:</h3> Members of the Histiocyte Society were asked to report cases of FHL2 on specific forms. Data were pooled in a common database and analysed. <h3>Results:</h3> The 124 patients had 63 different mutations (including 15 novel mutations): 11 nonsense, 10 frameshift, 38 missense and 4 in-frame deletions. Some mutations were found more commonly: 1122 G→A (W374X), associated with Turkish origin, in 32 patients; 50delT (L17fsX22) associated with African/African American origin, in 21 patients; and 1090-91delCT (L364fsX), in 7 Japanese patients. Flow cytometry showed that perforin expression was absent in 40, reduced in 6 and normal in 4 patients. Patients presented at a median age of 3 months (quartiles: 2, 3 and 13 months), always with fever, splenomegaly and thrombocytopenia. NK activity was absent in 36 (51%), ⩽2% in 18 (26%), 3–⩽5% in 10 (14%), >5% in 4 (6%), “reduced” in 2 (3%) (not reported, n = 54). Nonsense mutations were significantly associated with younger age at onset (p<0.001) and absent natural killer activity (p = 0.008). <h3>Conclusion:</h3> <i>PRF1</i> mutations are spread over the functional domains. Specific mutations are strongly associated with Turkish, African American and Japanese ethnic groups. Later onset and residual cytotoxic function are observed in patients with at least one missense mutation." @default.
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• W2108697946 date "2007-10-26" @default.
• W2108697946 modified "2023-10-18" @default.
• W2108697946 title "Genotype phenotype study of familial haemophagocytic lymphohistiocytosis due to perforin mutations" @default.
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• W2108697946 doi "https://doi.org/10.1136/jmg.2007.052670" @default.
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