Figure 1.
Structure of the PML and RARA genes with the break point regions and the corresponding fusion gene transcripts. (a) The PML gene contains three well-defined small break point cluster regions (bcr's): bcr1 in intron 6, bcr2 in the downstream part of exon 6 and bcr3 in intron 3. In addition two rare break points in intron 7 have been reported. In the RARA gene the break points cluster in intron 2 (∼15 kb). (b) The three well-defined bcr's and the rare intron 7 breaks in the PML gene result in four different PML–RARA fusion transcripts. Percentages refer to the relative frequency of the various PML–RARA variants.