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IGH@ Translocations Co-exist With Other Primary Rearrangements in B-cell Precursor Acute Lymphoblastic Leukemia

Lookup NU author(s): Lisa Jones, Professor Christine Harrison FRCPath FMedSci, Dr Lisa Russell

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

Primary established genetic abnormalities in B-cell precursor acute lymphoblastic leukemia include high hyperdiploidy (51-65 chromosomes), the translocations t(12;21)(p13;q22)/ETV6-RUNX1 fusion and t(9;22)(q34;q11)/BCR-ABL1 fusion, MLL rearrangements and intrachromosomal amplification of chromosome 21. These rearrangements are of prognostic and therapeutic relevance and are usually mutually exclusive. We identified 28 patients at diagnosis with both a primary genetic rearrangement and an immunoglobulin heavy chain locus translocation using chromosomal analysis and fluorescence in situ hybridization. Among these patients, the immunoglobulin heavy chain locus translocation partner gene was identified in six (CRLF2, CEBPA, CEBPB, TRA/D@, IGF2BP1 and IGK@). Clonal architecture was investigated in 17 patients using multiple color interphase fluorescence in situ hybridization analysis, which showed that the translocation was acquired as a secondary abnormality in ten patients, in four patients the etiology was undetermined and in three patients it was observed in a separate clone from the primary chromosomal rearrangement. These findings demonstrate the co-existence of immunoglobulin heavy chain locus translocations with other primary chromosomal rearrangements either in the same or separate clones, which may have prognostic significance in B-cell precursor acute lymphoblastic leukemia.

Publication metadata

Author(s): Jeffries SJ, Jones L, Harrison CJ, Russell LJ

Publication type: Article

Publication status: Published

Journal: Haematologica

Year: 2014

Volume: 99

Issue: 8

Pages: 1334-1342

Print publication date: 01/08/2014

Acceptance date: 30/04/2014

Date deposited: 18/11/2014

ISSN (print): 0390-6078

ISSN (electronic): 1592-8721

Publisher: Fondazione Ferrata Storti

URL: http://dx.doi.org/10.3324/haematol.2014.103820

DOI: 10.3324/haematol.2014.103820

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