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Original Article
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Volume 335:1643-1649 November 28, 1996 Number 22
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Fas Gene Mutations in the Canale–Smith Syndrome, an Inherited Lymphoproliferative Disorder Associated with Autoimmunity
Jörn Drappa, M.D., Akshay K. Vaishnaw, M.D., Ph.D., Kathleen E. Sullivan, M.D., Ph.D., Jia-Li Chu, B.S., and Keith B. Elkon, M.D.

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ABSTRACT

Background The Canale–Smith syndrome is a childhood disorder characterized by lymphadenopathy and autoimmunity. The similarity between this syndrome and that in mice with the lymphoproliferation (lpr ) phenotype or the generalized-lymphoproliferative-disease (gld) phenotype led us to investigate whether it too is caused by mutations of the Fas gene (lpr mice) or the Fas ligand (gld mice), which regulate apoptosis in lymphocytes.

Methods We studied four patients with the syndrome and their families. T-lymphocyte phenotypes were analyzed, and the susceptibility of activated T cells to Fas-mediated apoptosis in vitro was determined. Mutations of Fas were sought by nucleotide-sequence analysis.

Results Patients with the Canale–Smith syndrome had increased numbers of circulating double-negative T cells (>20 percent) and profoundly impaired apoptosis of activated T cells incubated with an anti-Fas antibody. Three novel Fas mutations were identified, all of which were heterozygous and predicted to impair signal transduction by Fas. Autoimmune manifestations of the disease, such as hemolytic anemia and thrombocytopenia, persisted into adolescence. Two patients followed into adulthood had intermittent lymphadenopathy, which diminished over time. Neoplasms developed in both, and one died of hepatocellular carcinoma at the age of 43.

Conclusions Patients with the Canale–Smith syndrome have mutations in Fas — a fact that implicates this gene in the accumulation of lymphocytes and the autoimmunity characteristic of the syndrome.


Source Information

From the Division of Rheumatology, Hospital for Special Surgery, Cornell University Medical Center, New York (J.D., A.K.V., J.-L.C., K.B.E.), and the Division of Pediatrics, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia (K.E.S.).

Address reprint requests to Dr. Elkon at the Hospital for Special Surgery, 535 E. 70th St., New York, NY 10021.

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Related Letters:

The Canale–Smith Syndrome
Straus S. E., Lenardo M., Puck J. M., Vaishnaw A. K., Sullivan K. E., Elkon K. B.
Extract | Full Text  
N Engl J Med 1997; 336:1457-1458, May 15, 1997. Correspondence

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