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Identification and molecular characterization of CALM/AF10fusion products in T cell acute lymphoblastic leukemia and acute myeloid leukemia

Abstract

The t(10;11)(p12-p13;q14-q21) observed in a subset of patients with either acute lymphoblastic leukemia or acute myeloid leukemia has been shown to result in the fusion of AF10 on chromosome 10 with CALM (also named CLTH) on chromosome 11. AF10 was originally identified as a fusion partner of MLL in the t(10;11)(p12-p13;q23) observed in myeloid leukemia. CALM is a newly isolated gene, cloned as the fusion partner of AF10 in the monocytoid cell line, U937. In order to understand the relationship between MLL, AF10, CALM and the leukemic process, fluorescence in situ hybridization and reverse transcriptase polymerase chain reaction were used to study a series of nine leukemia patients with a t(10;11). Six had myeloid leukemia (AML-M0, AML-M1, AML-M4 and AML-M5) and three had T cell lymphoblastic leukemia. We identified four different CALM/AF10 fusion products in five patients and AF10/CALM reciprocal message in one. We conclude that fusion of CALM and AF10 is a recurring abnormality in both lymphoid and myeloid leukemias of various types including AML-M5, and that the breakpoints in the two types of leukemia do not differ. Our data indicate that the CALM/AF10 fusion product on the der(10) chromosome is critical to leukemogenesis.

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Acknowledgements

We are grateful to Marjorie Isaacson for retrieval of patient information and data management, and to Dr Carlos Suarez, Loyola University Medical Center, for referral of patient 5. This work was supported in part by the National Cancer Institute, CA 42557 (JDR). KC was supported by the G Harold and Leila Y Mathers Charitable Foundation.

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Carlson, K., Vignon, C., Bohlander, S. et al. Identification and molecular characterization of CALM/AF10fusion products in T cell acute lymphoblastic leukemia and acute myeloid leukemia. Leukemia 14, 100–104 (2000). https://doi.org/10.1038/sj.leu.2401629

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