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. 1992 Sep;12(9):4186–4196. doi: 10.1128/mcb.12.9.4186

Thymic overexpression of Ttg-1 in transgenic mice results in T-cell acute lymphoblastic leukemia/lymphoma.

E A McGuire 1, C E Rintoul 1, G M Sclar 1, S J Korsmeyer 1
PMCID: PMC360323  PMID: 1508213

Abstract

T-cell translocation gene 1 (Ttg-1), also called rhombotin, is deregulated upon translocation into the alpha/delta T-cell receptor loci in acute lymphoblastic leukemias bearing the t(11;14)(p15;q11). Ttg-1 encodes a nuclear protein, expressed predominantly in neuronal cells, which belongs to a novel family of transcription factors possessing LIM domains. We utilized the lck proximal promoter to overexpress this candidate oncogene in immature thymocytes of transgenic mice. lckPr Ttg-1 mice develop immature, aggressive T-cell leukemia/lymphomas. Tumor incidence is proportional to the level of Ttg-1 expression. Most tumors contain CD4+8+ cells as well as CD4-8+ cells, which have an immature rather than a mature peripheral phenotype. Ttg-1-induced tumorigenesis preferentially affects a minority population of thymocytes representing an immature CD4-8+ intermediate stage between double-negative CD4-8- cells and double-positive CD4+8+ cells. This model indicates that the aberrant expression of putative transcription factors plays a primary role in the genesis of T-cell acute lymphoblastic leukemias.

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Selected References

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