Mild replication stress causes aneuploidy by deregulating microtubule dynamics in mitosis.
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BiBTeXChromosomal instability (CIN) causes structural and numerical chromosome aberrations and represents a hallmark of cancer. Replication stress (RS) has emerged as a driver for structural chromosome aberrations while mitotic defects can cause whole chromosome missegregation and aneuploidy. Recently, first evidence indicated that RS can also influence chromosome segregation in cancer cells exhibiting CIN, but the underlying mechanisms remain unknown. Here, we show that chromosomally unstable cancer cells suffer from very mild RS, which allows efficient proliferation and which can be mimicked by treatment with very low concentrations of aphidicolin. Both, endogenous RS and aphidicolin-induced very mild RS cause chromosome missegregation during mitosis leading to the induction of aneuploidy. Moreover, RS triggers an increase in microtubule plus end growth rates in mitosis, an abnormality previously identified to cause chromosome missegregation in cancer cells. In fact, RS-induced chromosome missegregation is mediated by increased mitotic microtubule growth rates and is suppressed after restoration of proper microtubule growth rates and upon rescue of replication stress. Hence, very mild and cancer-relevant RS triggers aneuploidy by deregulating microtubule dynamics in mitosis.
SEEK ID: https://seek-for2800.de/publications/2
PubMed ID: 31448675
Projects: SP-2: Molecular mechanisms of replication stress-induced mitotic chromos...
Publication type: Journal
Journal: Cell Cycle
Citation: Cell Cycle. 2019 Oct;18(20):2770-2783. doi: 10.1080/15384101.2019.1658477. Epub 2019 Aug 25.
Date Published: 27th Aug 2019
Registered Mode: by PubMed ID
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Our Research Unit addresses an important question on the origin of chromosome instability (CIN), which causes structural as well as numerical chromosome aberrations. Importantly, CIN and increased levels of chromosome aberrations are closely associated with many human diseases including cancer, neurodegenerative diseases and age-related syndromes and can act as key drivers for disease development and progression. An important condition that causes structural chromosome instability (S-CIN) leading ...
Projects: SP-3: A statistical modeling approach to identify common triggers for replication stress and mitotic chromosome missegregation, SP-1: Deciphering signaling pathways that promote accurate chromosome segregation after replication stress, SP-2: Molecular mechanisms of replication stress-induced mitotic chromosome missegregation, SP-4: Centrosome integrity as a determinant of replication stress and mitotic dysfunction, SP-5: Impaired chromosome integrity caused by mutations in members of the BTR complex, SP-6: Proteomics of mitotic inter sister chromatid junctions, SP-8: The causes of replication stress in response to whole chromosomal aneuploidy, SP-Z: NGS-based approaches for systematic analysis of genomic and chromosome instability Bernd Wollnik, Göttingen, SP9: Mutual impact of replication origin firing regulation and mitotic chromosome segregation
Web page: https://for2800.de/
Structural and numerical chromosome aberrations are commonly and concomitantly detected in cancer and in age-related syndrome cells suggesting a functional relationship between structural and whole chromosome instability (S-CIN and W-CIN, respectively). Recent evidence suggests that replication stress can not only drive S-CIN and the generation of structural chromosome aberrations, but might also be involved in W-CIN leading to whole chromosome missegregation during mitosis resulting in aneuploidy. ...
Programme: FOR2800
Public web page: https://for2800.de/cases/sub-project-2-molecular-mechanisms-of-replication-stress-induced-mitotic-chromosome-missegregation/
Start date: 1st Jan 2019
Chromosomal instability (CIN) causes structural and numerical chromosome aberrations and represents a hallmark of cancer. Replication stress (RS) has emerged as a driver for structural chromosome aberrations while mitotic defects can cause whole chromosome missegregation and aneuploidy. Recently, first evidence indicated that RS can also influence chromosome segregation in cancer cells exhibiting CIN, but the underlying mechanisms remain unknown. Here, we show that chromosomally unstable cancer ...
