Two related oncogenes, TCL-1 Swiss:P56279 and MTCP-1 Swiss:P56278, are overexpressed in T cell prolymphocytic leukaemias as a result of chromosomal rearrangements that involve the translocation of one T cell receptor gene to either chromosome 14q32 or Xq28 [1]. This family contains two repeated motifs that form a single globular domain [1].

1: Crystal structure of MTCP-1: implications for role of TCL-1 and MTCP-1 in T cell malignancies. Fu ZQ, Du Bois GC, Song SP, Kulikovskaya I, Virgilio L, Rothstein JL, Croce CM, Weber IT, Harrison RW; Proc Natl Acad Sci U S A 1998;95:3413-3418. PMID:9520380

2: Crystal structure of p14TCL1, an oncogene product involved in T-cell prolymphocytic leukemia, reveals a novel beta-barrel topology. Hoh F, Yang YS, Guignard L, Padilla A, Stern MH, Lhoste JM, van Tilbeurgh H; Structure 1998;6:147-155. PMID:9519406