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A compartment size-dependent selective threshold limits mutation accumulation in hierarchical tissues.

Dániel Grajzel1,2, Imre Derényi2,3, Gergely J Szöllősi4,2,5

  • 1MTA-ELTE "Lendület" Evolutionary Genomics Research Group, H-1117 Budapest, Hungary.

Proceedings of the National Academy of Sciences of the United States of America
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Hierarchical tissues slow cancer evolution. Smaller compartments create a barrier, preventing harmful mutations from persisting and reducing cancer risk.

Keywords:
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Area of Science:

  • Evolutionary biology
  • Cancer research
  • Tissue organization

Background:

  • Cancer arises from somatic mutations driving genetic evolution.
  • Hierarchical tissue organization inherently slows this evolution through differentiation and limited cell divisions.

Purpose of the Study:

  • To investigate how compartment size in hierarchical tissues influences somatic evolution.
  • To identify mechanisms by which tissue organization impacts cancer development.

Main Methods:

  • Modeling hierarchical tissues with cell number regulation.
  • Introducing mutants with proliferative advantages.
  • Analyzing the impact of compartment size on mutant persistence.

Main Results:

  • Tissue size regulation establishes a threshold for mutant proliferative advantage.
  • Smaller compartments impose a higher threshold, preventing mutant establishment.
  • Mutations with significant proliferative advantage can be expelled by differentiation in small compartments.

Conclusions:

  • Compartment size is a critical factor in the selective barrier against somatic evolution.
  • Small compartments significantly reduce cancer risk by expelling advantageous mutations.
  • This provides a new mechanism by which tissue architecture protects against cancer.