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Gene therapy: is IL2RG oncogenic in T-cell development?

The gene IL2RG encodes the gamma-chain of the interleukin-2 receptor and is mutated in patients with X-linked severe combined immune deficiency (X-SCID). Woods et al. report the development of thymus tumours in a mouse model of X-SCID after correction by lentiviral overexpression of IL2RG and claim that these were caused by IL2RG itself. Here we find that retroviral overexpression of IL2RG in human CD34+ cells has no effect on T-cell development, whereas overexpression of the T-cell acute lymphoblastic leukaemia (T-ALL) oncogene LMO2 leads to severe abnormalities. Retroviral expression of IL2RG may therefore not be directly oncogenic--rather, the restoration of normal signalling by the interleukin-7 receptor to X-SCID precursor cells allows progression of T-cell development to stages that are permissive for the pro-leukaemic effects of ectopic LMO2.[1]

References

  1. Gene therapy: is IL2RG oncogenic in T-cell development? Pike-Overzet, K., de Ridder, D., Weerkamp, F., Baert, M.R., Verstegen, M.M., Brugman, M.H., Howe, S.J., Reinders, M.J., Thrasher, A.J., Wagemaker, G., van Dongen, J.J., Staal, F.J. Nature (2006) [Pubmed]
 
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