Extended Data Fig. 19: Structural rearrangements associated with RNA fusions.

a, Systematic classification scheme of all gene fusions based on underlying structural variants (SVs). Numbers of fusion events of different classes are shown to the right. b, Schematic of examples of different types of structural-variant-supported fusions: (1) direct fusions; (2) intercomposite fusions; and (3) intracomposite fusions. Bridged fusions are shown in Fig. 3b. Only one of the possible orders of genomic arrangement is depicted in each case, with break points highlighted by thunderbolts. c, Supported rearrangements for composite fusions bring the fused segments of two genes significantly closer. Natural distance indicates the native distance between two related structural variant break points. Effective distance indicates the distance between the final two break points of the intra- and intercomposite fusions. d, The break points of structural-variant-independent fusions are typically closer than those for other interchromosomal fusions, which indicates that at least some of the structural-variant-independent fusions may occur directly at the RNA level, mediated either by trans-splicing or read-through events.