Curr Top Microbiol Immunol
August 1999
Immunoglobulin (Ig) and T-cell receptor (TCR) genes are rearranged in virtually all acute lymphoblastic leukemia (ALL) cases. However, the recombination patterns display several unusual features as compared to normal lymphoid counterparts. Cross-lineage gene rearrangements occur in more than 90% of precursor-B-ALL and in approximately 20% of T-ALL, whereas they are rare in normal lymphocytes.
View Article and Find Full Text PDFRearranged IGH genes were detected by Southern blotting in 22% of 118 cases of T-cell acute lymphoblastic leukemia (ALL) and involved monoallelic and biallelic rearrangements in 69% (18/26) and 31% (8/26) of these cases, respectively. IGH gene rearrangements were found in 19% (13/69) of CD3(-) T-ALL and in 50% of TCRgammadelta+ T-ALL (12/24), whereas only a single TCRalpha beta+ T-ALL (1/25) displayed a monoallelic IGH gene rearrangement. The association with the T-cell receptor (TCR) phenotype was further supported by the striking relationship between IGH and TCR delta (TCRD) gene rearrangements, ie, 32% of T-ALL (23/72) with monoallelic or biallelic TCRD gene rearrangements had IGH gene rearrangements, whereas only 1 of 26 T-ALL with biallelic TCRD gene deletions contained a monoallelic IGH gene rearrangement.
View Article and Find Full Text PDFA large series of 202 childhood precursor-B cell acute lymphoblastic leukemia (ALL) patients was analyzed by Southern blotting (SB) for cross-lineage rearrangements and/or deletions in the T cell receptor TCRB, TCRG and TCRD loci. In 93% (187/201) of the precursor-B-ALL patients one or more genes were rearranged and/or deleted. TCRB gene rearrangements were found in 35% (69/196), TCRG gene rearrangements in 59% (113/192), TCRD gene rearrangements in 55% (112/202), and isolated monoallelic or biallelic deletions of TCRD loci in 34% (68/202) of the cases.
View Article and Find Full Text PDFIt is now widely accepted that the detection of minimal residual disease (MRD) has prognostic value in acute leukemia. However clinical MRD studies need standardized techniques. Therefore, several European laboratories have aligned their goals and performed comparative studies to achieve optimization and standardization of MRD techniques.
View Article and Find Full Text PDFBackground: Sensitive techniques for detection of minimal residual disease (MRD) at degrees of one leukaemic cell per 10(3)-10(6) cells (10(-3)-10(-6)) during follow-up of children with acute lymphoblastic leukaemia (ALL) can provide insight into the effectiveness of cytotoxic treatment. However, it is not yet clear how information on MRD can be applied to treatment protocols.
Methods: We monitored 240 patients with childhood ALL who were treated according to national protocols of the International BFM Study Group.
Analysis of minimal residual disease (MRD) can predict outcome in acute lymphoblastic leukemia (ALL). A large prospective study in childhood ALL has shown that MRD analysis using immunoglobulin (Ig) and T cell receptor (TCR) gene rearrangements as PCR targets can identify good and poor prognosis groups of substantial size that might profit from treatment adaptation. This MRD-based risk group assignment was based on the kinetics of tumor reduction.
View Article and Find Full Text PDFVirtually all immunoglobulin kappa (IGK) gene deletions are mediated via rearrangements of the so-called kappa deleting element (Kde). Kde rearrangements occur either to Vkappa gene segments (Vkappa-Kde rearrangements) or to the heptamer recombination signal sequence in the Jkappa-Ckappa intron. Kde rearrangements were analyzed by the polymerase chain reaction (PCR) and heteroduplex analysis in 130 B-lineage leukemias: 63 precursor-B-acute lymphoblastic leukemias (ALL) and 67 chronic B cell leukemias.
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