Hyper-IgM syndrome (HIGM) is a primary immunodeficiency characterized by normal to elevated serum levels of IgM and low levels or the absence of IgG, IgA, and IgE. A new study AID expression in nonlymphoid cells
(see related article on pages
136–142) characterizes HIGM type 4, a previously undocumented defect in antibody gene diversification caused by a selective block in class-switch recombination, providing significant insight towards understanding HIGM immunodeficiencies.
John P. Manis, Frederick W. Alt
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