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Complete Loss of Fas Ligand Gene Causes Massive Lymphoproliferation and Early Death, Indicating a Residual Activity of gld Allele ¹

Saoussen Karray^2,*, Chantal Kress, Sylvain Cuvellier^*, Catherine Hue-Beauvais^*, Diane Damotte, Charles Babinet and Matthieu Lévi-Strauss^2,*

^* Institut National de la Santé et de la Recherche Médicale Unité 580, Hôpital Necker, Paris, France; Unité de Biologie du Développement, Institut Pasteur, Paris, France; and Service d’Anatomie Pathologique, Hôpital Européen Georges Pompidou, Paris, France

To investigate the in vivo function of Fas ligand (FasL), we produced a mouse strain with a FasL gene flanked by loxP sequences. Mice with homozygous floxed FasL gene showed no obvious abnormalities. However, germline deletion of the FasL gene, obtained after mating with mice expressing ubiquitous Cre recombinase, resulted in an unexpectedly severe phenotype. FasL^-/- mice exhibited an extreme splenomegaly and lymphadenopathy associated with lymphocytic infiltration into multiple organs and autoimmune disease. This severe phenotype led to the premature death at 4 mo of age of >50% of the homozygous mice. It stands in sharp contrast with the milder disease observed in gld (generalized lymphoproliferative disease) mice, indicating that the FasL allele of these mice encodes a protein still able to bind, albeit at a very low level, the Fas receptor.

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