title: Fluorescence in situ hybridization analysis of the cryptic t(12;21) (p13;q22) in childhood B-lineage acute lymphoblastic leukemia.
abstract: We evaluated retrospectively the cryptic t(12;21)(p13;q22) in 15 children with early B-lineage acute lymphocytic leukemia who had a normal karyotype by using the locus specific probes of TEL and AML1 genes in a dual color fluorescence in situ hybridization (FISH). The FISH analysis revealed six patients with the fusion gene TEL/AML1 on chromosome 21, three of whom possessed a double fusion gene. In addition, the AML1 probe revealed hyperdiploid clones that were not detected in the conventional cytogenetic analysis. A discrepancy between the proportion of cells with the fusion gene in interphase nuclei and metaphases was noted.
authors.affiliation: Department of Human Genetics, Hadassah Hebrew University Hospital and Medical School, Jerusalem 91120, Israel.
authors.forename: Orly
authors.initials: O
authors.lastname: Yehuda-Gafni
authors.forename: Gabriel
authors.initials: G
authors.lastname: Cividalli
authors.forename: Ayala
authors.initials: A
authors.lastname: Abrahmov
authors.forename: Michael
authors.initials: M
authors.lastname: Weintrob
authors.forename: Susana Ben
authors.initials: SB
authors.lastname: Neriah
authors.forename: Rachel
authors.initials: R
authors.lastname: Cohen
authors.forename: Dvorah
authors.initials: D
authors.lastname: Abeliovich
mesh_terms: D002051:Burkitt Lymphoma / Q000235:genetics*; D002648:Child; D002675:Child, Preschool; D002881:Chromosomes, Human, Pair 12 / Q000235:genetics*; D002891:Chromosomes, Human, Pair 21 / Q000235:genetics*; D050676:Core Binding Factor Alpha 2 Subunit; D005260:Female; D006801:Humans; D017404:In Situ Hybridization, Fluorescence / Q000379:methods; D007223:Infant; D007621:Karyotyping; D008297:Male; D015514:Oncogene Proteins, Fusion / Q000235:genetics; D012189:Retrospective Studies; D014178:Translocation, Genetic / Q000235:genetics; D000097764:ETS Translocation Variant 6 Protein
chemical_list: D050676:Core Binding Factor Alpha 2 Subunit; D015514:Oncogene Proteins, Fusion; C102421:TEL-AML1 fusion protein; D000097764:ETS Translocation Variant 6 Protein