Akasaka T

Claviez A

Dyer MJS

Gesk S

Harder L

Harrison C

Karran EL

Majid A

Mazzullo H

Moorman AV

Nagel I

Ross F

Russell LJ

Siebert R

Strefford JC

Sugimoto KJ

Translocations involving the immunoglobulin heavy chain locus (IGH@) at chromosome band 14q32 are common in mature B-cell neoplasms, but are rare in B-cell precursor acute lymphoblastic leukemia (BCP-ALL). Here, we report the translocation, t(6;14)(p22;q32), involving IGH@ as a novel recurrent translocation in 13 BCP-ALL patients. Fluorescence in situ hybridization and long-distance inverse polymerase chain reaction (PCR) identified ID4 as the partner gene. Breakpoints were scattered over a 19kb region centromeric of ID4. Quantitative real-time PCR showed up-regulation of ID4 mRNA. All patients had deletions of CDKN2A and PAX5 located on the short arm of chromosome 9, frequently as a result of an isochromosome, i(9)(q10) (9/13, 69%). This study defines a new subgroup of BCP-ALL characterized by ID4 over-expression and CDKN2A and PAX5 deletions. Preliminary survival data suggest that this subgroup may be associated with a good response to therapy

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t(6;14)(p22;q32): a new recurrent <em>IGH@</em> translocation involving <em>ID4</em> in B-cell precursor acute lymphoblastic leukemia (BCP-ALL)

t(6;14)(p22;q32): a new recurrent <em>IGH@</em> translocation involving <em>ID4</em> in B-cell precursor acute lymphoblastic leukemia (BCP-ALL)

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