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

Impaired Ig class switch in mice deficient for the X-linked lymphoproliferative disease gene Sap.

X-linked lymphoproliferative disease (XLP) is characterized by abnormal immune responses to Epstein-Barr virus attributed to inactivating mutations of the SAP gene. Previous studies showed immunoglobulin E (IgE) deficiency and low serum IgG levels in Sap-deficient mice before and after viral infections, which are associated with impaired CD4+ T-helper function. In the present work, we find that signaling lymphocytic activation molecule (SLAM)-associated protein (SAP) is expressed in B cells and this expression is down-regulated after stimulation with lipopolysaccharide (LPS) and interleukin 4 (IL-4). We demonstrate that B cells from Sap-deficient mice exhibit reduced IgG and IgA production in vitro. This impairment correlates with decreased circular transcript levels of Ialpha, Igamma2a, Igamma2b, and Igamma3 after stimulation, which indicate a defective Ig switch recombination in Sap-deficient B cells. While XLP is believed to cause defects in T, natural killer T (NKT), and natural killer (NK) cells, our results indicate that B cells are also affected.[1]


  1. Impaired Ig class switch in mice deficient for the X-linked lymphoproliferative disease gene Sap. Al-Alem, U., Li, C., Forey, N., Relouzat, F., Fondanèche, M.C., Tavtigian, S.V., Wang, Z.Q., Latour, S., Yin, L. Blood (2005) [Pubmed]
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