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TTG-2, a new gene encoding a cysteine-rich protein with the LIM motif, is overexpressed in acute T-cell leukaemia with the t(11;14)(p13;q11)



TTG-2, a new gene encoding a cysteine-rich protein with the LIM motif, is overexpressed in acute T-cell leukaemia with the t(11;14)(p13;q11)



Oncogene 6(10): 1887-1893



We have cloned 70 kb of DNA from chromosome 11p13 at the site of a recurrent translocation in T-cell leukaemia (T-ALL): t(11;14)(p13;q11). The translocation involves the TCR-delta gene on 14q11 and a new site on 11p13. Two new and 10 previously identified translocations all mapped within 25 kb on 11p13, the 11p13 T-cell translocation cluster (11p13 ttc). A search for expressed sequences surrounding the breakpoint cluster region on 11p13 identified a gene telomeric of all breakpoints which is overexpressed in three T-ALL samples with a t(11;14). The gene T-cell translocation gene (TTG-2) encodes a small cysteine-rich protein. Forty-eight per cent of the amino acids are identical with another translocation-deregulated gene, TTG-1 (T-cell translocation gene 1 or rhombotin) in 11p15. There are two copies of a cysteine-rich motif in both proteins. Two tandem copies of the same cysteine-rich motif are also present in the recently described lin-11, isl-1 and mec-3 gene products, and one motif is found in the CRIP protein. Therefore the proteins encoded by these two translocation-deregulated genes belong to this new class of cysteine-rich proteins with the 'LIM' motif, which are important in normal development.

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Accession: 041530965

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PMID: 1923511


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