Fig. 6.
Gross chromosomal hyper-rearrangements mediated by sister-chromatid bridging in 53BP1-depleted cancer cells. a Formation of new chromosome 16 and 7 derivatives in HeLa 53BP1hypo and 53BP1Δ clones. Left panels: whole chromosome 16 painting revealing 16p arm deletion and arm/centromeric translocations in HeLa b9 (53BP1hypo) cells. Middle panels: 16q deletions and arm/centromeric translocations in HeLa B2 (53BP1hypo) cells; Isochromosome 16q formation in HeLa b15 (53BP1hypo) cells. Right panels: whole chromosome 7 painting revealing centromeric translocation in HeLa D4 (53BP1Δ) cells and arm deletion and centromeric translocation in HeLa B2 (53BP1hypo) cells. b Ideogram of human chromosome 16, marking the positions of FISH probes used in Fig. 6c–f. c 16q distal arm deletion, centromeric translocation and 16p isochromosome formation was identified in HeLa B2 (53BP1hypo) populations with the indicated percentages. d 16p whole-arm deletion, 16q whole-arm translocation and 16q distal-arm translocation were detected in HeLa b9 (53BP1hypo) populations with the indicated percentages. e 16q isochromosome formation was detected in HeLa b15 (53BP1hypo) populations with the indicated percentages. f Normal chromosome 16 showing both p-arm and q-arm is maintained in all HeLa cells