Abstract
Telomeres shorten with each cell division and can ultimately becomesubstrates for nonhomologous end-joining repair, leading to large-scale genomic rearrangements of the kind frequently observed in human cancers. We have characterized more than 1400 telomere fusion events at the single-molecule level, using a combination of high-throughput sequence analysis together with experimentally induced telomeric double-stranded DNA breaks.We show that a single chromosomal dysfunctional telomere can fuse with diverse nontelomeric genomic loci, even in the presence of an otherwise stable genome, and that fusion predominates in coding regions. Fusion frequency was markedly increased in the absence of TP53 checkpoint control and significantly modulated by the cellular capacity for classical, versus alternative, nonhomologous end joining (NHEJ). We observed a striking reduction in inter-chromosomal fusion events in cells lacking DNA ligase 4, in contrast to a remarkably consistent profile of intra-chromosomal fusion in the context of multiple genetic knockouts, including DNAligase 3 and 4 doubleknockouts. We reveal distinct mutational signatures associated with classicalNHEJ-mediated inter-chromosomal, as opposed to alternativeNHEJ-mediated intra-chromosomal, telomere fusions and evidence for an unanticipated sufficiency ofDNAligase 1 for these intra-chromosomal events. Our findings have implications for mechanisms driving cancer genome evolution.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 588-600 |
| Number of pages | 13 |
| Journal | Genome research |
| Volume | 26 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 2016 |
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Sister chromatid telomere fusions, but not NHEJmediated inter-chromosomal telomere fusions, occur independently of DNA ligases 3 and 4. / Liddiard, Kate; Ruis, Brian; Takasugi, Taylor; Harvey, Adam; Ashelford, Kevin E.; Hendrickson, Eric A.; Baird, Duncan M.
In: Genome research, Vol. 26, No. 5, 05.2016, p. 588-600.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Sister chromatid telomere fusions, but not NHEJmediated inter-chromosomal telomere fusions, occur independently of DNA ligases 3 and 4
AU - Liddiard, Kate
AU - Ruis, Brian
AU - Takasugi, Taylor
AU - Harvey, Adam
AU - Ashelford, Kevin E.
AU - Hendrickson, Eric A.
AU - Baird, Duncan M.
PY - 2016/5
Y1 - 2016/5
N2 - Telomeres shorten with each cell division and can ultimately becomesubstrates for nonhomologous end-joining repair, leading to large-scale genomic rearrangements of the kind frequently observed in human cancers. We have characterized more than 1400 telomere fusion events at the single-molecule level, using a combination of high-throughput sequence analysis together with experimentally induced telomeric double-stranded DNA breaks.We show that a single chromosomal dysfunctional telomere can fuse with diverse nontelomeric genomic loci, even in the presence of an otherwise stable genome, and that fusion predominates in coding regions. Fusion frequency was markedly increased in the absence of TP53 checkpoint control and significantly modulated by the cellular capacity for classical, versus alternative, nonhomologous end joining (NHEJ). We observed a striking reduction in inter-chromosomal fusion events in cells lacking DNA ligase 4, in contrast to a remarkably consistent profile of intra-chromosomal fusion in the context of multiple genetic knockouts, including DNAligase 3 and 4 doubleknockouts. We reveal distinct mutational signatures associated with classicalNHEJ-mediated inter-chromosomal, as opposed to alternativeNHEJ-mediated intra-chromosomal, telomere fusions and evidence for an unanticipated sufficiency ofDNAligase 1 for these intra-chromosomal events. Our findings have implications for mechanisms driving cancer genome evolution.
AB - Telomeres shorten with each cell division and can ultimately becomesubstrates for nonhomologous end-joining repair, leading to large-scale genomic rearrangements of the kind frequently observed in human cancers. We have characterized more than 1400 telomere fusion events at the single-molecule level, using a combination of high-throughput sequence analysis together with experimentally induced telomeric double-stranded DNA breaks.We show that a single chromosomal dysfunctional telomere can fuse with diverse nontelomeric genomic loci, even in the presence of an otherwise stable genome, and that fusion predominates in coding regions. Fusion frequency was markedly increased in the absence of TP53 checkpoint control and significantly modulated by the cellular capacity for classical, versus alternative, nonhomologous end joining (NHEJ). We observed a striking reduction in inter-chromosomal fusion events in cells lacking DNA ligase 4, in contrast to a remarkably consistent profile of intra-chromosomal fusion in the context of multiple genetic knockouts, including DNAligase 3 and 4 doubleknockouts. We reveal distinct mutational signatures associated with classicalNHEJ-mediated inter-chromosomal, as opposed to alternativeNHEJ-mediated intra-chromosomal, telomere fusions and evidence for an unanticipated sufficiency ofDNAligase 1 for these intra-chromosomal events. Our findings have implications for mechanisms driving cancer genome evolution.
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UR - http://www.scopus.com/inward/citedby.url?scp=84964961415&partnerID=8YFLogxK
U2 - 10.1101/gr.200840.115
DO - 10.1101/gr.200840.115
M3 - Article
C2 - 26941250
AN - SCOPUS:84964961415
VL - 26
SP - 588
EP - 600
JO - Genome Research
JF - Genome Research
SN - 1054-9803
IS - 5
ER -