title: [TAL1 gene analysis in T-cell malignancies].
abstract: Site-specific recombination of the TAL1 gene was analyzed by Southern blotting and polymerase chain reaction (PCR) in 44 cases of childhood T-cell acute lymphoblastic leukemia (T-ALL), 20 cases of childhood T-cell non-Hodgkin's lymphoma (T-NHL) and 35 cases of adult T-cell malignancies. This recombination was found in 10 (22.7%) of 44 childhood T-ALL patients, but in none of the T-NHL or adult T-cell malignancies. Recombination of the TAL1 gene was therefore suggested to be specific for childhood T-ALL. The immunophenotypic features of the 10 T-ALL patients with this recombination were CD1-, CD2+, CD4-, CD7+, CD10-, and they had a significantly better outcome than other T-ALL cases without the recombination. The PCR technique revealed minimal residual disease (MRD) in 2 patients. One showed persistent MRD, while in the other MRD was recognized only at initial diagnosis. Further investigation is needed whether T-ALL with this recombination constitutes a distinct clinical subgroup among childhood T-ALL patients.
authors.affiliation: Division of Hematology/Oncology, Saitama Children's Medical Center.
authors.forename: A
authors.initials: A
authors.lastname: Kikuchi
authors.forename: S
authors.initials: S
authors.lastname: Kobayashi
authors.forename: R
authors.initials: R
authors.lastname: Hanada
authors.forename: K
authors.initials: K
authors.lastname: Moriwaki
authors.forename: K
authors.initials: K
authors.lastname: Yamamoto
authors.forename: J
authors.initials: J
authors.lastname: Fujimoto
authors.forename: Y
authors.initials: Y
authors.lastname: Kaneko
authors.forename: S
authors.initials: S
authors.lastname: Yamamori
authors.forename: H
authors.initials: H
authors.lastname: Miwa
authors.forename: K
authors.initials: K
authors.lastname: Kita
authors.forename: Y
authors.initials: Y
authors.lastname: Hayashi
mesh_terms: D000293:Adolescent; D000328:Adult; D051792:Basic Helix-Loop-Helix Proteins; D015139:Blotting, Southern; D002648:Child; D002675:Child, Preschool; D004268:DNA-Binding Proteins / Q000235:genetics*; D005260:Female; D006801:Humans; D015459:Leukemia-Lymphoma, Adult T-Cell / Q000235:genetics*; D008228:Lymphoma, Non-Hodgkin / Q000235:genetics*; D016399:Lymphoma, T-Cell / Q000235:genetics*; D008297:Male; D018365:Neoplasm, Residual; D016133:Polymerase Chain Reaction; D011379:Prognosis; D011518:Proto-Oncogene Proteins; D011995:Recombination, Genetic; D000073942:T-Cell Acute Lymphocytic Leukemia Protein 1; D014157:Transcription Factors
chemical_list: D051792:Basic Helix-Loop-Helix Proteins; D004268:DNA-Binding Proteins; D011518:Proto-Oncogene Proteins; D000073942:T-Cell Acute Lymphocytic Leukemia Protein 1; D014157:Transcription Factors; C067143:TAL1 protein, human