Premium
Interphase fluorescence in situ hybridization and spectral karyotyping reveals hidden genetic aberrations in children with acute lymphoblastic leukaemia and a normal banded karyotype
Author(s) -
Nordgren Ann,
Schoumans Jacqueline,
Söderhäll Stefan,
Nordenskjöld Magnus,
Blennow Elisabeth
Publication year - 2001
Publication title -
british journal of haematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.907
H-Index - 186
eISSN - 1365-2141
pISSN - 0007-1048
DOI - 10.1046/j.1365-2141.2001.03008.x
Subject(s) - karyotype , fluorescence in situ hybridization , interphase , biology , centromere , gene rearrangement , microbiology and biotechnology , genetics , chromosome , gene
Twenty‐two cases of childhood acute lymphoblastic leukaemia (ALL) with normal G‐ or Q‐banded karyotypes were studied by interphase fluorescence in situ hybridization (FISH) and spectral karyotyping. Probes detecting MLL , BCR/ABL and TEL/AML1 rearrangements were used for the interphase studies, along with centromere‐specific probes from chromosomes 17 and X. In 10 patients (45%), previously undetected aberrations were demonstrable. Specific gene rearrangements and structural changes were found in six cases and numerical changes in five. Five of these aberrations have previously been reported to have an impact on prognosis. Three cases were massively hyperdiploid and, in one, the prognostically important BCR/ABL fusion was detected. In addition, a near‐haploid karyotype with 27 chromosomes was found in one patient and TEL/AML1 rearrangements were detected in two cases. This study indicates that about half of childhood ALL cases with apparently normal karyotypes harbour genetic aberrations that may be detected using interphase FISH and spectral karyotyping.