Case Report: Rare IKZF1 Gene Fusions Identified in Neonate with Congenital KMT2A-Rearranged Acute Lymphoblastic Leukemia

Laura N. Eadie, Jacqueline A. Rehn, James Breen, Michael P. Osborn, Sophie Jessop, Charlotte E.J. Downes, Susan L. Heatley, Barbara J. McClure, David T. Yeung, Tamas Revesz, Benjamin Saxon, Deborah L. White

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Abstract

Chromosomal rearrangements involving the KMT2A gene occur frequently in acute lymphoblastic leukaemia (ALL). KMT2A-rearranged ALL (KMT2Ar ALL) has poor long-term survival rates and is the most common ALL subtype in infants less than 1 year of age. KMT2Ar ALL frequently occurs with additional chromosomal abnormalities including disruption of the IKZF1 gene, usually by exon deletion. Typically, KMT2Ar ALL in infants is accompanied by a limited number of cooperative le-sions. Here we report a case of aggressive infant KMT2Ar ALL harbouring additional rare IKZF1 gene fusions. Comprehensive genomic and transcriptomic analyses were performed on sequential samples. This report highlights the genomic complexity of this particular disease and describes the novel gene fusions IKZF1::TUT1 and KDM2A::IKZF1.

Original languageEnglish
Article number264
Number of pages11
JournalGenes
Volume14
Issue number2
DOIs
Publication statusPublished - Feb 2023
Externally publishedYes

Keywords

  • case report
  • chromosomal abnormalities
  • congenital acute lymphoblastic leukemia
  • fusion gene
  • IKZF1 translocation
  • infant ALL
  • KMT2A-rearranged ALL
  • mRNA-sequencing

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