title: T cell receptor gamma and delta rearrangements in hematologic malignancies. Relationship to lymphoid differentiation.
abstract: We have studied recombinatorial events of the T cell receptor delta and gamma chain genes in hematopoietic malignancies and related these to normal stages of lymphoid differentiation. T cell receptor delta gene recombinatorial events were found in 91% of acute T cell lymphoblastic leukemia, 68% of non-T, non-B lymphoid precursor acute lymphoblastic leukemia (ALL) and 80% of mixed lineage acute leukemias. Mature B-lineage leukemias and acute nonlymphocytic leukemias retained the T-cell receptor delta gene in the germline configuration. The incidence of T cell receptor gamma and delta was particularly high in CD10+CD19+ non-T, non-B lymphoid precursor ALL. In lymphoid precursor ALL, T cell receptor delta was frequently rearranged while T cell receptor gamma was in the germline configuration. This suggests that TCR delta rearrangements may precede TCR gamma rearrangements in lymphoid ontogeny. In T-ALL, only concordant T cell receptor delta and gamma rearrangements were observed. Several distinct rearrangements were defined using a panel of restriction enzymes. Most of the rearrangements observed in T-ALL represented joining events of J delta 1 to upstream regions. In contrast, the majority of rearrangements in lymphoid precursor ALL most likely represented D-D or V-D rearrangements, which have been found to be early recombinatorial events of the TCR delta locus. We next analyzed TCR delta rearrangements in five CD3+TCR gamma/delta+ ALL and cell lines. One T-ALL, which demonstrated a different staining pattern with monoclonal antibodies against the products of the TCR gamma/delta genes than the PEER cell line, rearranges J delta 1 to a currently unidentified variable region.
authors.affiliation: Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis 55455.
authors.forename: F
authors.initials: F
authors.lastname: Griesinger
authors.forename: J M
authors.initials: JM
authors.lastname: Greenberg
authors.forename: J H
authors.initials: JH
authors.lastname: Kersey
mesh_terms: D000943:Antigens, Differentiation / Q000032:analysis; D002454:Cell Differentiation; D015321:Gene Rearrangement; D015334:Gene Rearrangement, gamma-Chain T-Cell Antigen Receptor; D006801:Humans; D007938:Leukemia / Q000235:genetics*; D015459:Leukemia-Lymphoma, Adult T-Cell / Q000235:genetics; D011948:Receptors, Antigen, T-Cell / Q000235:genetics*; D016692:Receptors, Antigen, T-Cell, gamma-delta; D013601:T-Lymphocytes / Q000276:immunology*; D014407:Tumor Cells, Cultured
chemical_list: D000943:Antigens, Differentiation; D011948:Receptors, Antigen, T-Cell; D016692:Receptors, Antigen, T-Cell, gamma-delta