title: Analysis of DNA surrounding the breakpoints of chromosomal translocations involving the beta T cell receptor gene in human lymphoblastic neoplasms.
abstract: DNA containing breakpoints of two different t(7;9) chromosomal translocations was cloned from the T lymphoblastic tumor cell lines SUP-T1 and SUP-T3. Sequence analysis of DNA from the t(7;9)(q34;q34.3) translocation of SUP-T1 revealed that chromosome 9 DNA had recombined with DNA 5' to rearranged D-J regions in the beta T cell receptor gene of chromosome 7. Restriction analysis and hybridization studies using DNA fragments cloned from the t(7;9)(q34;32) translocation of SUP-T3 confirmed that beta T cell receptor DNA is also joined to the DNA of chromosome 9 in these cells. Using hybridization probes for the two breakpoints, several other cases of T lymphoblastic tumors were shown to possess DNA rearrangements near the 9q34.3 and 9q32 sites. Hybridization with the 9q34.3 probe detected multiple transcripts in SUP-T1 RNA and small amounts of larger transcripts in T cells lacking the t(7;9)(q34;q34.3) translocation. This work directly demonstrates that the beta T cell receptor locus may frequently be involved in chromosomal translocations within T lymphoblastic neoplasms.
mesh_terms: D002874:Chromosome Mapping; D002897:Chromosomes, Human, Pair 7; D002899:Chromosomes, Human, Pair 9; D004262:DNA Restriction Enzymes; D004273:DNA, Neoplasm / Q000235:genetics; D006801:Humans; D007945:Leukemia, Lymphoid / Q000235:genetics*; D010446:Peptide Fragments / Q000235:genetics*; D012333:RNA, Messenger / Q000235:genetics; D012334:RNA, Neoplasm / Q000235:genetics; D011948:Receptors, Antigen, T-Cell / Q000235:genetics*; D016693:Receptors, Antigen, T-Cell, alpha-beta; D011995:Recombination, Genetic; D013601:T-Lymphocytes / Q000502:physiology*; D014178:Translocation, Genetic
chemical_list: D004273:DNA, Neoplasm; D010446:Peptide Fragments; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D011948:Receptors, Antigen, T-Cell; D016693:Receptors, Antigen, T-Cell, alpha-beta; D004262:DNA Restriction Enzymes