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The different effects of apoptosis and DNA repair on tumorigenesis
Joshua B Plotkin1, Martin A Nowak
1Institute for Advanced Study, Princeton, NJ 08540, USA. plotkin@ias.edu
Abstract:
Complex multicellular organisms have evolved mechanisms to ensure that individual cells follow their proper developmental and somatic programs. Tumorigenesis, or uncontrolled cellular proliferation, is caused by somatic mutations to those genetic constraints that normally operate within a tissue. Genes involved in DNA repair and apoptosis are particularly instrumental in safeguarding cells against tumorigenesis. In this paper, we introduce a stochastic framework to analyse the somatic evolution of cancer initiation. Within this model, we study how apoptosis and DNA repair can maintain the transient stability of somatic cells and delay the onset of cancer. Focusing on individual cell lineages, we calculate the waiting time before tumorigenesis in the presence of varying degrees of apoptosis and DNA repair. We find that the loss of DNA repair or the loss of apoptosis both hasten tumorigenesis, but in characteristically different ways.
Insights
Cancer initiation is delayed by DNA repair and apoptosis, crucial cellular safeguards. Loss of either mechanism accelerates tumor development through distinct pathways, impacting somatic evolution.
Area of Science:
- Cellular Biology
- Genetics
- Cancer Research
Background:
- Multicellular organisms rely on cellular programs for development and somatic stability.
- Tumorigenesis arises from mutations disrupting genetic controls on cell proliferation.
- DNA repair and apoptosis are key genetic mechanisms preventing cancer.
Purpose of the Study:
- To introduce a stochastic framework for analyzing cancer initiation.
- To investigate the roles of apoptosis and DNA repair in delaying tumorigenesis.
- To model the impact of varying apoptosis and DNA repair levels on cancer onset.
Main Methods:
- Development of a stochastic framework for somatic evolution analysis.
- Calculation of waiting times for tumorigenesis in individual cell lineages.
- Simulation of varying degrees of DNA repair and apoptosis.
Main Results:
- Both DNA repair and apoptosis contribute to the transient stability of somatic cells.
- Loss of DNA repair accelerates tumorigenesis.
- Loss of apoptosis also hastens tumorigenesis, but via different mechanisms than DNA repair loss.
Conclusions:
- Apoptosis and DNA repair are critical for preventing uncontrolled cellular proliferation.
- Disruptions in these pathways significantly alter the timeline and mechanisms of cancer initiation.
- Understanding these processes offers insights into cancer prevention and somatic evolution.