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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Mice lacking the CARD of CARMA1 exhibit defective B lymphocyte development and impaired proliferation of their B and T lymphocytes.

CARMA1 (originally called CARD11) is a membrane-associated guanylate kinase family member that is required for T cell receptor (TCR)-induced NF-kappa B activation in T cell leukemia lines. It uses its N-terminal caspase activation and recruitment domain (CARD) to interact with the CARD in the downstream adaptor Bcl-10. We show that primary B and T lymphocytes from knock-in mice expressing only a CARDless form of CARMA1 (Delta CARD) are defective at mitogen-induced NF-kappa B activation and fail to proliferate. CARMA1 mutant mice exhibited normal T but impaired B cell development; CD5(+) peritoneal B cells were absent, and serum immunoglobulin levels were markedly reduced. A lacZ reporter gene knocked into the CARMA1 locus confirmed lymphocyte-specific expression of CARMA1. Thus, CARMA1 has an essential role in mediating B and T lymphocyte proliferation and requires its CARD to engage downstream signaling components.[1]

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