Abstract.
X-linked lymphoproliferative (XLP) disease is a fatal immunological disorder that renders the immune system unable to respond effectively to Epstein-Barr virus (EBV) infection. The gene that encodes a protein termed SAP or SH2D1A is either deleted or mutated in XLP patients, resulting in uncontrolled B- and T-cell proliferation upon EBV infection. Here, we report the cloning and characterization of the mouse SAP gene. It is localized on the mouse X chromosome and comprises four exons spanning approximately 25 kb. Its expression appears to be restricted to T lymphocytes. Whereas a high level of SAP expression is observed in Th1 cells, only small amounts are detectable in Th2 cells. Moreover, SAP expression is down-regulated upon in vitro activation of T cells, including CD4+, CD8+ single-positive T cells, and Th1 and Th2 cells. This study provides valuable information for in-depth genetic and biochemical analysis of the function of SAP in the immune system.
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Wu, C., Sayos, J., Wang, N. et al. Genomic organization and characterization of mouse SAP, the gene that is altered in X-linked lymphoproliferative disease. Immunogenetics 51, 805–815 (2000). https://doi.org/10.1007/s002510000215
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DOI: https://doi.org/10.1007/s002510000215