Identification of an ETV6-ABL2 fusion transcript in combination with an ETV6 point mutation in a T-cell acute lymphoblastic leukaemia cell line.
ETV6, a member of the Ets family of transcription factors, is frequently rearranged to various translocation partners in human leukaemias. We previously described a CD3+/TCRalpha/beta+ mature T-cell acute lymphoblastic leukaemia (T-ALL) cell line, MT-ALL, carrying a t(1;10;12)(q25; p13;p13) with cytokine-inducible lineage switch into the myeloid lineage. Using reverse transcription polymerase chain reaction with primers complementary to ETV6 and ABL2, two ETV6-ABL2 fusion transcripts were identified in MT-ALL which resulted from alternative splicing of an ABL2 exon. The fusion transcripts code for putative ETV6-ABL2 fusion proteins containing the pointed domain of ETV6 and almost the complete ABL2 protein, including the SH2, SH3 domains and the protein tyrosine kinase domain (PTK). Identical ETV6-ABL2 fusion transcripts have been reported in an acute myeloid leukaemia (AML) M3 cell line, carrying both a t(15;17)(q22;q21) and a t(1;12)(q25;p13) with unusual inducible differentiation to eosinophils, and in a patient with AML-M4eo. Interestingly, the non-rearranged allele of ETV6 in the MT-ALL cell line carries an arginine to histidine (R399H) mutation which affects a conserved amino acid in the ets DNA binding domain.
Griesinger
Frank
F
Division of Haematology and Oncology, and Department of Internal Medicine, University of Göttingen, Göttingen, Germany. fgriesi@med.uni-goettingen.de
Janke
Angela
A
Podleschny
Martina
M
Bohlander
Stefan K
SK
D000595:Amino Acid Sequence; D000818:Animals; D019677:Artificial Gene Fusion; D001483:Base Sequence; D004268:DNA-Binding Proteins / Q000235:genetics*; D006801:Humans; D015459:Leukemia-Lymphoma, Adult T-Cell / Q000235:genetics*; D051379:Mice; D016513:Mice, SCID; D008969:Molecular Sequence Data; D015514:Oncogene Proteins, Fusion / Q000235:genetics*; D017354:Point Mutation; D011505:Protein-Tyrosine Kinases; D050783:Proto-Oncogene Proteins c-ets; D012097:Repressor Proteins / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D000097764:ETS Translocation Variant 6 Protein
D004268:DNA-Binding Proteins; D015514:Oncogene Proteins, Fusion; D011505:Protein-Tyrosine Kinases; D050783:Proto-Oncogene Proteins c-ets; D012097:Repressor Proteins; D000097764:ETS Translocation Variant 6 Protein; C426234:TEL-ABL fusion protein, human