| First Author | DiSanto JP | Year | 1994 |
| Journal | Eur J Immunol | Volume | 24 |
| Issue | 2 | Pages | 475-9 |
| PubMed ID | 8299698 | Mgi Jnum | J:16867 |
| Mgi Id | MGI:64926 | Doi | 10.1002/eji.1830240232 |
| Citation | DiSanto JP, et al. (1994) Interleukin-2 (IL-2) receptor gamma chain mutations in X-linked severe combined immunodeficiency disease result in the loss of high-affinity IL-2 receptor binding. Eur J Immunol 24(2):475-9 |
| abstractText | Interactions of interleukin-2 (IL-2) with its high-affinity, heterotrimeric receptor (IL-2R alpha beta gamma) play a pivotal role in the autocrine pathway of T lymphocyte expansion required in an immune response. Mutations in the IL-2R gamma chain-encoding gene have been found in SCIDX1, a primary immunodeficiency characterized by the absence of T cell and NK cell development. We have investigated six unrelated SCIDX1 patients for molecular abnormalities of the IL-2R gamma gene. A variety of defects were identified, including the absence of transcripts, frame-shift deletions and point mutations within canonical cytokine receptor motifs (conserved cysteines and the WS box). The ability of these mutated IL-2R gamma chains to participate in the function of a high-affinity IL-2R complex was examined by radiolabeled IL-2 binding studies using Epstein-Barr virus-transformed B lymphoblastoid cell lines (B-LCL) derived from SCIDX1 patients. Although normal control B-LCL express high-affinity IL-2 binding sites (Kd = 60 pM, 150 sites/cell), B-LCL derived from SCIDX1 patients failed to bind IL-2 under high-affinity conditions. These SCIDX1 mutations confirm the critical role of the IL-2R gamma chain in T cell and NK cell development. In addition, these data provide insight into the structure/function relationship of the IL-2R gamma chain by identifying residues required for the formation of a high-affinity IL-2R complex. |
