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- W2000335629 abstract "Elucidation of the molecular basis of hyper-immunoglobulin-M syndromes has provided considerable insight into the molecular events involved in antibody maturation, including immunoglobulin class switch recombination and the generation of somatic hypermutation.The identification of activation-induced cytidine deaminase deficiency (hyper-immunoglobulin-M syndrome 2) has revealed the key role played by this inducible B cell-specific molecule in both class switch recombination and somatic hypermutation. Data from Escherichia coli and in-vitro assays have strongly suggested that activation-induced cytidine deaminase acts as a DNA-editing enzyme in these processes. The recent description of a new hyper-immunoglobulin-M syndrome caused by mutations in the gene encoding the uracil-N glycosylase provided further evidence that activation-induced cytidine deaminase acts on deoxycytidine in the switch and variable regions. Indeed, uracil-N glycosylase is required to remove the uracil residues integrated into DNA following deoxycytidine deamination by activation-induced cytidine deaminase. Another hyper-immunoglobulin-M condition has recently been described (hyper-immunoglobulin-M syndrome 4). Its molecular basis is unknown, but it appears to be a homogeneous entity characterized by an intrinsic B cell defective class switch recombination but normal generation of somatic hypermutation. It is probably caused by a class switch recombination-specific DNA repair defect because class switch recombination-induced DNA breaks in S regions are normally detected in patients with this condition.The heterogeneity in hyper-immunoglobulin-M syndromes will continue to shed light on the molecular mechanisms of class switch recombination and somatic hypermutation. The description of hyper-immunoglobulin-M syndromes may therefore lead to improvements in the care of these patients." @default.
- W2000335629 created "2016-06-24" @default.
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- W2000335629 date "2003-12-01" @default.
- W2000335629 modified "2023-10-17" @default.
- W2000335629 title "Hyper-immunoglobulin-M syndromes caused by an intrinsic B cell defect" @default.
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- W2000335629 doi "https://doi.org/10.1097/00130832-200312000-00002" @default.
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