The combination of Stat1 inactivation and Myc activation specifically suppresses the immune cell infiltration that normally accompanies chromosomal instability. This dual genetic alteration allows aneuploid cells to evade immune surveillance and persist despite the aneuploidy-induced stress that would normally constrain their fitness. [@schubert_cancer_2021]
Definitions
- chromosomal instability
- immune cell infiltration
- aneuploidaneuploidy
- cellular fitness
- immune surveillance
- myc activation
- stat1 inactivation
- aneuploid cells
- aneuploidy-induced stress
- fitness
Synthesis
Chromosomal instability imposes a significant fitness cost on aneuploid cells by triggering increased immune cell infiltration into tumors, creating a barrier to malignant transformation that must be overcome for successful tumorigenesis. The mechanistic solution that chromosomally unstable tumors have convergently evolved involves the specific combination of Stat1 signaling inactivation paired with increased Myc activity, which together alleviate the immune surveillance pressure induced by ongoing chromosome missegregation. This dual genetic alteration is enriched in aneuploid cancers across both mouse and human systems, indicating that the pathway represents a conserved evolutionary strategy for evading the aneuploidy-induced stress response. While it is established that this mechanism allows aneuploid cells to suppress immune infiltration and achieve proliferative capacity despite chromosomal imbalance, the molecular details of how Stat1 loss and Myc activation specifically interact to counteract immune recognition, and whether alternative mechanisms can substitute for this pathway in different tumor contexts, remain areas requiring further investigation.
Related
- Stat1 inactivation mechanism is conserved between mouse and human aneuploid cancers
- Mps1 truncation-induced CIN generates convergent recurrent chromosome gains
- Chromosomal instability promotes immune cell infiltration into tumors
- Multipolar divisions are rare and typically produce inviable progeny
- Aneuploid cancers inactivate Stat1 to circumvent immune surveillance
- Different aneuploid cells share common fitness-related traits
- Aneuploidy increases spontaneous tumor formation in aged animals
- Increased aneuploidy inhibits chemically and genetically induced tumorigenesis
- Aneuploid tumors inactivate Stat1 signaling with increased Myc activity
- Extra centrosomes correlate with chromosomal instability in tumors
- CIN exists independently of classic mitotic defects in most cells
- Single-cell sequencing reveals karyotype heterogeneity in lymphomas
- Aneuploidy exhibits dual roles as oncogenic and tumor-suppressive
- CIN causality toward aneuploidy was previously unanswered
- Aneuploidy decreases both organismal and cellular fitness
- Aneuploidy causes proliferative disadvantage independent of extra chromosome identity
- p53 loss is common but not enriched in chromosomally unstable tumors
- CENP-E reduction generates aneuploidy and chromosomal instability
- Missegregation alone insufficient for aneuploid cell propagation