Cell Cycle Dynamics in Cancer Cells

Cancer cells exploit fundamental programmes of cell division to achieve uncontrolled proliferation and survival under stress. Key regulators of the cell cycle—cyclins, cyclin-dependent kinases (CDKs) and checkpoint pathways—are frequently deregulated, leading to accelerated progression through G1, S, G2 and M phases. Mitotic errors, including faulty chromosome segregation and failure of the spindle assembly checkpoint, give rise to chromosomal instability and aneuploidy. Replication stress, emerging from unscheduled origin firing or DNA damage, further compromises genome integrity. These perturbations generate intratumour heterogeneity and adaptive potential but also create mitotic vulnerabilities that can be targeted therapeutically. Recent advances reveal how motor proteins, helicase complexes and apoptotic regulators intersect with checkpoint control to determine cancer cell fate and expose novel strategies for precision intervention.

Research from Nature Portfolio

A study on small-molecule inhibitors of the kinesin motor protein KIF18A demonstrated selective lethality in cancer cells with high chromosomal instability. In models of high-grade serous ovarian and triple-negative breast cancers, KIF18A inhibition activated the mitotic checkpoint, induced prolonged arrest and triggered apoptosis without overt toxicity to normal haematopoietic cells. Tumour regression in mouse xenografts highlighted a promising therapeutic index for targeting mitotic motors in p53-mutant, CIN-enriched cancers.

Foundational work on aneuploid human cell lines revealed that gain of individual chromosomes precipitates replication stress and genomic instability. Deficits in the chromatin association of the replicative helicase MCM2–7 underlie DNA damage and chromosomal rearrangements in trisomic and tetrasomic cells. Restoration of near-normal helicase levels partially rescued replication defects, establishing a mechanistic link between aneuploidy, replication stress and tumour evolution.

Cell Cycle Dynamics in Cancer Cells publication trend

The graph below shows the total number of articles in cell cycle dynamics in cancer cells across all publications each year (not limited to Nature Index journals).

Technical terms

Chromosomal instability (CIN): A cellular state characterised by ongoing errors in chromosome segregation, leading to karyotypic heterogeneity.

Aneuploidy: The presence of an abnormal number of chromosomes in a cell, often arising from mitotic missegregation.

Spindle assembly checkpoint (SAC): A surveillance mechanism that prevents anaphase onset until all chromosomes are properly attached to the mitotic spindle.

Replication stress: Conditions that impede normal DNA synthesis, such as stalled replication forks or insufficient origin licensing, culminating in DNA damage.

Kinesin motor protein (KIF18A): A microtubule-dependent motor that regulates chromosome alignment and mitotic progression by modulating spindle dynamics.

MCM helicase: A hexameric complex (MCM2–7) essential for unwinding DNA at replication origins during S phase.

References

1. Small-molecule inhibition of kinesin KIF18A reveals a mitotic vulnerability enriched in chromosomally unstable cancers. Nature Cancer (2023).
2. The presence of extra chromosomes leads to genomic instability. Nature Communications (2016).
3. The two sides of chromosomal instability: drivers and brakes in cancer. Signal Transduction and Targeted Therapy (2024).
4. BID expression determines the apoptotic fate of cancer cells after abrogation of the spindle assembly checkpoint by AURKB or TTK inhibitors. Molecular Cancer (2023).