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Arnould, C. et al.

The signal transducer and activator of transcription STAT5b gene is a new partner of retinoic acid receptor alpha in acute promyelocytic-like leukaemia.

Acute promyelocytic leukaemia (APL) exhibits a characteristic t(15;17) translocation that fuses the promyelocytic leukaemia (PML) gene on 15q22 to the retinoic acid receptor alpha (RARA) gene on 17q12-q21. 1. In a small subset of acute promyelocytic-like leukaemias (APL-L), RARA is fused to a different partner: the pro-myelocytic leukaemia zinc finger (PLZF) gene on 11q23, the nucleophosmin (NPM) gene on 5q35 or the nuclear mitotic apparatus (NuMA) gene on 11q13. We report on the molecular characterization of a RARA gene re-arrangement in a patient with APL-L and demonstrate that the signal transducer and activator of transcription STAT5b gene is fused with RARA. STAT5b belongs to the janus kinase (JAK)-STAT signalling pathway. Remarkably, the STAT5b component of the chimeric protein is delocalized from the cytoplasm to the nucleus, where it displays a microspeckled pattern. Therefore, unusual features of this APL-L might result from dysregulation of the JAK/STAT5 signal transducing pathways in the patient leukaemic cells. In this study, we identified STAT5b as a new gene fused to RARA in leukaemia; this is the first human tumour bearing a structurally abnormal STAT gene.[1]

References

The signal transducer and activator of transcription STAT5b gene is a new partner of retinoic acid receptor alpha in acute promyelocytic-like leukaemia. Arnould, C., Philippe, C., Bourdon, V., Gr goire, M.J., Berger, R., Jonveaux, P. Hum. Mol. Genet. (1999) [Pubmed]

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