Definition
Having an abnormal number of chromosomes that deviates from the typical diploid complement.
A condition characterized by an abnormal number of chromosomes, either more or fewer than the normal diploid number.
Related Claims
- Missegregation alone insufficient for aneuploid cell propagation
- CIN exists independently of classic mitotic defects in most cells
- CIN causality toward aneuploidy was previously unanswered
- Aneuploidy decreases both organismal and cellular fitness
- Different aneuploid cells share common fitness-related traits
- Aneuploidy impairs cell cycle progression in haploid yeast
- Aneuploidy increases glucose uptake in yeast cells
- Aneuploidy heightens sensitivity to protein synthesis interference
- Extra chromosome genes drive aneuploid phenotypes through imbalanced protein composition
- Aneuploidy causes proliferative disadvantage independent of extra chromosome identity
- Aneuploid tumors inactivate Stat1 signaling with increased Myc activity
- p53 loss is common but not enriched in chromosomally unstable tumors
- Stat1 inactivation mechanism is conserved between mouse and human aneuploid cancers
- Aneuploid cancers inactivate Stat1 to circumvent immune surveillance
- Growth medium conditions affect aneuploid strain proteome composition
Synthesis
Aneuploidy, consistently defined across sources as an abnormal chromosome number that deviates from the normal diploid or euploid state, imposes fundamental cellular costs through multiple mechanistic pathways. The condition creates a proteotoxic burden because proteins encoded by genes on duplicated chromosomes increase approximately twofold in abundance, disrupting stoichiometric balance in protein complexes and triggering widespread metabolic alterations, cell cycle defects, proliferative disadvantages, and heightened sensitivity to protein synthesis interference—effects remarkably consistent regardless of which specific chromosome is gained. However, the relationship between aneuploidy and cancer remains contested, with evidence showing it both drives spontaneous tumor formation in aged animals and simultaneously inhibits chemically or genetically induced tumorigenesis, revealing context-dependent oncogenic and tumor-suppressive roles. Recent work has begun to resolve this paradox by demonstrating that aneuploid cancer cells must actively suppress immune surveillance through specific mechanisms such as Stat1 inactivation combined with Myc activation, suggesting that the fitness costs of aneuploidy create immunogenic stress that cells must overcome to achieve malignancy, though the precise mechanisms linking chromosomal instability to ongoing aneuploidy generation in most tumor cells remain incompletely understood.