期刊
ONCOGENE
卷 20, 期 40, 页码 5638-5643出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.onc.1204596
关键词
14q32.1; TCLI; TCLIb; Akt; T-cell leukemia
资金
- NCI NIH HHS [CA 81534] Funding Source: Medline
The TCL1 locus on human chromosome 14q32.1 is activated in T-cell leukemias by translocations and inversions that juxtapose it to regulatory elements of T-cell receptor genes. We isolated and characterized four genes at this locus, TCL1 and TCL1b (T-cell leukemia/lymphoma 1 and 1b), and TNG1 and TNG2 (TCL neighboring genes 1 and 2) all of which are overexpressed following rearrangements involving 14q32.1. TCL1 and TCL1b show 60% similarity and are represented in the mouse by a cluster of six homologous genes. In humans TCL1 and TCL1b show similar expression patterns: They are expressed mainly in CD4-/CD8- immature T-cells, pre B-cells and virgin B-cells. Expression decreases significantly at more mature stages of B-cell development. Activation of TCL1 and/or TCL1b in mature T-cells causes T-cell leukemia in humans. The oncogenic nature of TCL1 was confirmed by the analysis of a transgenic mouse model. Functional analysis of Tcl1 revealed its involvement in a P13-kinase dependent Akt (PKB) pro-survival pathway through its interaction with the Akt kinase which increases Akt's enzymatic activity and promotes translocation of Akt to the nucleus.
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