Single-nucleosome imaging unveils that condensins and nucleosome-nucleosome interactions differentially constrain chromatin to organize mitotic chromosomes.
Nat Commun
; 15(1): 7152, 2024 Aug 21.
Article
em En
| MEDLINE
| ID: mdl-39169041
ABSTRACT
For accurate mitotic cell division, replicated chromatin must be assembled into chromosomes and faithfully segregated into daughter cells. While protein factors like condensin play key roles in this process, it is unclear how chromosome assembly proceeds as molecular events of nucleosomes in living cells and how condensins act on nucleosomes to organize chromosomes. To approach these questions, we investigate nucleosome behavior during mitosis of living human cells using single-nucleosome tracking, combined with rapid-protein depletion technology and computational modeling. Our results show that local nucleosome motion becomes increasingly constrained during mitotic chromosome assembly, which is functionally distinct from condensed apoptotic chromatin. Condensins act as molecular crosslinkers, locally constraining nucleosomes to organize chromosomes. Additionally, nucleosome-nucleosome interactions via histone tails constrain and compact whole chromosomes. Our findings elucidate the physical nature of the chromosome assembly process during mitosis.
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Cromatina
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Nucleossomos
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Adenosina Trifosfatases
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Complexos Multiproteicos
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Proteínas de Ligação a DNA
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Mitose
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article