Duplication of Isodicentric Chromosome 13, idic(13)(p11.2), Leading to Pentasomy 13q in Acute Myeloid Leukemia without MaturationKjeldsen E. · Kallenbach M.
aCancer Cytogenetics Laboratory, Department of Hematology, Aarhus University Hospital, Aarhus, and bDepartment of Hematology, Institute for Clinical Medicine, Aalborg University Hospital, Aalborg, Denmark
Isodicentric chromosome 13, idic(13)(p11.2), is a very rare chromosomal aberration in acute myeloid leukemia (AML). We describe here a novel case of AML without maturation, where the leukemic cells harbored double idic(13)(p11.2) and a normal chromosome 13 resulting in pentasomy 13q. Analyses were done on aspirated bone marrow cells from diagnosis. We utilized G-banding analysis, 24-color karyotyping and additional FISH analyses with various locus-specific probes to characterize the chromosomal complement. Oligonucleotide-based 180K aCGH analysis was done to search for submicroscopic imbalances. The karyotype was 47,XY,idic(13)(p11.2)x2/46,XY. Pantelomeric FISH analysis indicated critically short telomeres. Oligo-based aCGH analysis confirmed high copy gain of chromosome 13q and did not disclose other genomic imbalances. Reviewing the literature, this may be the second case of pentasomy 13q, since idic(13)(p11.2), when analyzed by conventional cytogenetics, is indistinguishable from i(13)(q10). Both cases were associated with immature AML and a poor outcome. We propose that idic(13)(p11.2) is a new recurrent abnormality in AML without maturation and suggest that pentasomy 13q is an early event in pathogenesis of AML through amplification of genes located on 13q.
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