Abstract
We analysed a complex translocation involving chromosomes 7, 11, 19 and 22 in infant acute monocytic leukemia, and identified that the MLL gene on 11q23 was fused to the unconventional myosin type 1F, MYO1F, gene on 19p13.2–13.3. MYO1F consists of at least 28 exons and was predicted to encode a 1098-amino-acid with an N-terminal head domain containing both ATP-binding and actin-binding sequences, a neck domain with a single IQ motif, and a tail with TH1, TH2 and SH3 domains. Northern blot analysis of RNAs prepared from multiple tissues showed that the expression of approximately 4-kb transcripts appeared constant in most tissues examined. However, MYO1F was expressed in only three of 22 leukemic cell lines. The MLL-MYO1F fusion protein contains almost the entire MYO1F, however, C-terminal MYO1F has neither the transactivation domain nor the dimerization domain found in various MLL fusion partners. Further analysis of this novel type of MLL fusion protein would provide new insights into leukemogenesis. MYO1F is the fourth partner gene of MLL on 19p13. At the cytogenetic level, it may be difficult to distinguish MLL-ENL, MLL-ELL, MLL-EEN and MLL-MYO1F fusions created by t(11;19)(q23;p13), and it is likely that cases of t(11;19) lacking a known fusion gene may result in this gene fusion.
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Accession codes
Abbreviations
- AML:
-
acute myeloid leukemia
- ALL:
-
acute lymphoblastic leukemia
- AMoL:
-
acute monocytic leukemia
- RT–PCR:
-
reverse transcription–polymerase chain reaction
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Acknowledgements
We thank Dr Yoshinobu Matsuo (Hayashibara Biochemical Laboratories, Inc., Fujisaki Cell Center, Okayama, Japan) for providing varieties of leukemic cell lines. This work was supported by a Grant-in-Aid for Cancer Research from the Ministry of Health, Labor and Welfare of Japan, a Grant-in-Aid for Scientific Research on Priority Areas, a Grant-in-Aid for Scientific Research (B) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and Japan Leukaemia Research Fund.
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Taki, T., Akiyama, M., Saito, S. et al. The MYO1F, unconventional myosin type 1F, gene is fused to MLL in infant acute monocytic leukemia with a complex translocation involving chromosomes 7, 11, 19 and 22. Oncogene 24, 5191–5197 (2005). https://doi.org/10.1038/sj.onc.1208711
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DOI: https://doi.org/10.1038/sj.onc.1208711
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