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A t(11;15) fuses MLL to two different genes, AF15q14 and a novel gene MPFYVE on chromosome 15

Abstract

The mixed lineage leukemia gene (MLL, also known as HRX, ALL-1 and Htrx) located at 11q23 is involved in translocations with over 40 different chromosomal bands in a variety of leukemia subtypes. Here we report our analysis of a rare but recurring translocation, t(11;15)(q23;q14). This translocation has been described in a small subset of cases with both acute myeloblastic leukemia and ALL. Recent studies have shown that MLL is fused to AF15q14 in the t(11;15). Here we analyse a sample from another patient with this translocation and confirm the presence of an MLL–AF15q14 fusion. However, we have also identified and cloned another fusion transcript from the same patient sample. In this fusion transcript, MLL is fused to a novel gene, MLL partner containing FYVE domain (MPFYVE). Both MLL–AF15q14 and MLL–MPFYVE are in-frame fusion transcripts with the potential to code for novel fusion proteins. MPFYVE is also located on chromosome 15, approximately 170 kb telomeric to AF15q14. MPFYVE contains a highly conserved motif, the FYVE domain which, in other proteins, has been shown to bind to phosphotidyl-inositol-3 phosphate (PtdIns(3)P). The MLL–MPFYVE fusion may be functionally important in the leukemia process in at least some patients containing this translocation.

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Acknowledgements

We thank Dr Steve Morris and Dr Martin Kuefer for sharing sequence information of AF15q14 and the preliminary data about the size and the expression pattern of AF15q14 prior to publication.This study was supported by grants CA 42557 and CA 84405 (J.D.R.); CA40046 and CA78438 (N.J.Z.-L.); a postdoctoral fellowship award from Leukemia Research Foundation and Cancer Biology training grant, T32 CA09595 (VC) and by the Spastic Paralysis Foundation of Illinois, Eastern Iowa District of Kiwanis International.

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Correspondence to Janet D Rowley.

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Chinwalla, V., Chien, A., Odero, M. et al. A t(11;15) fuses MLL to two different genes, AF15q14 and a novel gene MPFYVE on chromosome 15. Oncogene 22, 1400–1410 (2003). https://doi.org/10.1038/sj.onc.1206273

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