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Identification of the TCL6 genes within the breakpoint cluster region on chromosome 14q32 in T-cell leukemia

Oncogene volume 19, pages 2796–2802 (2000)Cite this article

Abstract

A region on chromosome 14q32.1 is often involved in chromosomal translocations and inversions with one of the T-cell receptor loci in T-cell lymphoproliferative diseases. The breakpoints of the different rearrangements segregate into two clusters; a cluster due to inversion on the centromeric side and a cluster due to simple balanced translocations on the telomeric side. If the target gene activated by these different types of chromosomal rearrangements is the same, the gene must be localized between the two clusters of breakpoints in a region of around 160 kb. Within this breakpoint cluster region, we isolated two genes; namely, TCL1 and TML1/TCL1b genes. In the course of characterizing the TML1 gene, we further identified a third novel gene, which we named TCL6 (T-cell leukemia/lymphoma 6), from a region 7 kb upstream of the TML1 locus. The TCL6 gene expressed at least 11 isoforms through very complex alternative-splicing, including splicing with the TML1 gene. Those isoforms encode at least five open reading frames (ORFs) with no homology to known sequences. The localization of the proteins corresponding to these ORF was determined by fusing green fluorescence protein at the carboxyl terminal of each ORF. ORF141 and ORF72 were observed in the cytoplasmic region, while ORF105, ORF119, and ORF163 were predominantly localized in the nuclear region. Since the TCL6 gene was expressed in T-cell leukemia carrying a t(14;14)(q11;q32.1) chromosome translocation and was not expressed in normal T-cells (just like the TML1 and TCL1 genes), it is also a candidate gene potentially involved in leukemogenesis.

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Acknowledgements

We thank Dr T Matsuse, Dr R Timms and Dr K Sasaki for critical reading of the manuscripts. This work was supported in part by a Grant-in Aid from the Ministry of Education, Science, Sports and Culture, by a Grant from Joint-Research Project for Regional Intensive from Japan Science and Technology, and by Special Coordination Funds of the Science Technology Agency of the Japanese Government. The sequence accession number of DDBJ corresponding to TCL6 cDNA and genomic sequences are ABO35332, ABO35333, ABO35334, ABO35335, ABO35337, ABO35338, ABO35339, ABO35340, ABO35341, ABO35342, ABO35343, ABO35344, ABO35345 and ABO35346.

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Authors and Affiliations

  1. Department of Materials and Biosystem Engineering, Faculty of Engineering, Toyama University, Toyama, 930-8555, Japan

    Masumichi Saitou, Jun Sugimoto, Toyomasa Hatakeyama & Masaharu Isobe

  2. The IDI-IRCCS, Research Laboratories, Via dei Monti di Creta 104, Rome, 00167, Italy

    Giandomenico Russo

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  1. Masumichi Saitou
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  4. Giandomenico Russo
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Saitou, M., Sugimoto, J., Hatakeyama, T. et al. Identification of the TCL6 genes within the breakpoint cluster region on chromosome 14q32 in T-cell leukemia. Oncogene 19, 2796–2802 (2000). https://doi.org/10.1038/sj.onc.1203604

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