Reconstitution of anaphase DNA bridge recognition and disjunction

Faithful chromosome segregation requires that the sister chromatids be disjoined completely. Defective disjunction can lead to the persistence of histone-free threads of DNA known as ultra-fine bridges (UFBs) that connect the separating sister DNA molecules during anaphase. UFBs arise at specific ge...

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Published in:Nature structural & molecular biology Vol. 25; no. 9; pp. 868 - 876
Main Authors: Sarlós, Kata, Biebricher, Andreas S, Bizard, Anna H, Bakx, Julia A M, Ferreté-Bonastre, Anna G, Modesti, Mauro, Paramasivam, Manikandan, Yao, Qi, Peterman, Erwin J G, Wuite, Gijs J L, Hickson, Ian D
Format: Journal Article
Language:English
Published: United States Nature Publishing Group 01.09.2018
Subjects:
Anaphase
Centromeres
Chromatids
Deoxyribonucleic acid
Disjunction
DNA
DNA biosynthesis
DNA structure
Fragile sites
Mitosis
Nondisjunction
Proteins
Recognition
Sister chromatids
ISSN:1545-9993, 1545-9985, 1545-9985
Online Access:Get full text
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Summary:Faithful chromosome segregation requires that the sister chromatids be disjoined completely. Defective disjunction can lead to the persistence of histone-free threads of DNA known as ultra-fine bridges (UFBs) that connect the separating sister DNA molecules during anaphase. UFBs arise at specific genomic loci and can only be visualized by detection of associated proteins such as PICH, BLM, topoisomerase IIIα, and RPA. However, it remains unknown how these proteins work together to promote UFB processing. We used a combination of ensemble biochemistry and new single-molecule assays to reconstitute key steps of UFB recognition and processing by these human proteins in vitro. We discovered characteristic patterns of hierarchical recruitment and coordinated biochemical activities that were specific for DNA structures modeling UFBs arising at either centromeres or common fragile sites. Our results describe a mechanistic model for how unresolved DNA replication structures are processed by DNA-structure-specific binding factors in mitosis to prevent pathological chromosome nondisjunction.
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ISSN:1545-9993
1545-9985
1545-9985
DOI:10.1038/s41594-018-0123-8