aneuploidAneuploidy reduces fitness at both the organismal level and the individual cell level, demonstrating that chromosomal imbalance creates a broad cellular stress. This fitness reduction manifests through impaired cell proliferationproliferation, altered metabolism, and reduced immortalization capacity across different aneuploid cell types. [@williams_aneuploidy_2008]
Definitions
- aneuploidaneuploidy
- organismal fitness
- cellular fitness
- chromosomal imbalance
- immortalization
- cell proliferationproliferation
- fitness
- aneuploid
Synthesis
It is well established across multiple model systems that aneuploidy—the presence of an abnormal chromosome number—consistently reduces fitness at both the organismal and cellular levels, regardless of which specific chromosome is gained or lost. This general fitness cost operates through pleiotropic cellular stress mechanisms that manifest as impaired proliferation, altered metabolic properties, and reduced immortalization capacity in trisomic mammalian cells, as well as proliferative disadvantages in aneuploid yeast strains carrying different extra chromosomes. The mechanistic basis for this fitness reduction involves chromosomal imbalance creating fundamental physiological constraints, though the precise molecular pathways remain incompletely resolved. What is particularly notable is that aneuploid cancer cells must evolve specific compensatory mechanisms—such as inactivating Stat1 signaling to evade immune surveillance—to overcome these inherent fitness costs, suggesting that aneuploidy-induced stress and the cellular responses to it represent contested selective pressures during tumor evolution.
Related
- Aneuploidy alters cellular metabolic properties
- Aneuploid cancers inactivate Stat1 to circumvent immune surveillance
- Different aneuploid cells share common fitness-related traits
- Whole genome amplification enables single-cell array CGH analysis
- Aneuploidy impairs cell proliferation in trisomic lines
- Stat1 loss combined with Myc activation alleviates CIN-induced immune infiltration
- Aneuploidy causes proliferative disadvantage independent of extra chromosome identity
- Missegregation alone insufficient for aneuploid cell propagation
- Aneuploidy affects cellular immortalization capacity