title: Clinical and biologic characterization of T-cell neoplasias with rearrangements of chromosome 7 band q34.
abstract: In T cell malignancy, rearrangements of chromosome 14 have been observed with a break in the band that contains the alpha chain gene for the T cell receptor (TCR). Because the beta chain TCR gene is in chromosome band 7q34, we searched for and report finding specific rearrangements of 7q34 exclusively in T cell malignancies. The rearrangements were reciprocal translocations between 7q34 and other points: 1p34, 9q32, 9q34, 15q22, and 19p13. The malignancies containing a 7q34 translocation were either T cell acute lymphoblastic leukemias or T cell lymphoblastic lymphomas that had similarities in clinical, enzyme, immunologic, and cellular characteristics. Hybridization using a probe to the beta-TCR gene disclosed unique rearrangements consistent with clonality in every case. A common pattern with chromosome breakpoints involving TCR genes may be emerging in T cell neoplasia.
mesh_terms: D000243:Adenosine Deaminase / Q000378:metabolism; D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis; D000951:Antigens, Neoplasm / Q000032:analysis; D000954:Antigens, Surface / Q000032:analysis; D002869:Chromosome Aberrations / Q000503:physiopathology*; D002871:Chromosome Banding; D025063:Chromosome Disorders; D002897:Chromosomes, Human, Pair 7; D006801:Humans; D007945:Leukemia, Lymphoid / Q000235:genetics*; D011683:Purine-Nucleoside Phosphorylase / Q000378:metabolism; D011948:Receptors, Antigen, T-Cell / Q000235:genetics; D016693:Receptors, Antigen, T-Cell, alpha-beta; D014178:Translocation, Genetic; D014407:Tumor Cells, Cultured
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D000951:Antigens, Neoplasm; D000954:Antigens, Surface; D011948:Receptors, Antigen, T-Cell; D016693:Receptors, Antigen, T-Cell, alpha-beta; D011683:Purine-Nucleoside Phosphorylase; D000243:Adenosine Deaminase