Selective Y centromere inactivation triggers chromosome shattering in micronuclei and repair by non-homologous end joining
Ly et al. establish a method to selectively inactivate the centromere of the Y chromosome to follow chromosome shattering and micronuclei formation through several cell cycles, and suggest re-ligation of chromosome fragments is dependent on non-homologous end joining. Chromosome missegregation into...
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Published in | Nature cell biology Vol. 19; no. 1; pp. 68 - 75 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
London
Nature Publishing Group UK
01.01.2017
Nature Publishing Group |
Subjects | |
Online Access | Get full text |
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Summary: | Ly
et al.
establish a method to selectively inactivate the centromere of the Y chromosome to follow chromosome shattering and micronuclei formation through several cell cycles, and suggest re-ligation of chromosome fragments is dependent on non-homologous end joining.
Chromosome missegregation into a micronucleus can cause complex and localized genomic rearrangements
1
,
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known as chromothripsis
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, but the underlying mechanisms remain unresolved. Here we developed an inducible Y centromere-selective inactivation strategy by exploiting a CENP-A/histone H3 chimaera to directly examine the fate of missegregated chromosomes in otherwise diploid human cells. Using this approach, we identified a temporal cascade of events that are initiated following centromere inactivation involving chromosome missegregation, fragmentation, and re-ligation that span three consecutive cell cycles. Following centromere inactivation, a micronucleus harbouring the Y chromosome is formed in the first cell cycle. Chromosome shattering, producing up to 53 dispersed fragments from a single chromosome, is triggered by premature micronuclear condensation prior to or during mitotic entry of the second cycle. Lastly, canonical non-homologous end joining (NHEJ), but not homology-dependent repair, is shown to facilitate re-ligation of chromosomal fragments in the third cycle. Thus, initial errors in cell division can provoke further genomic instability through fragmentation of micronuclear DNAs coupled to NHEJ-mediated reassembly in the subsequent interphase. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1465-7392 1476-4679 |
DOI: | 10.1038/ncb3450 |