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Aging and immortality in a cell proliferation model.

T Antal¹, K B Blagoev, S A Trugman

¹Center for Polymer Studies and Department of Physics, Boston University, Boston, MA 02215, USA.

Journal of Theoretical Biology

|July 17, 2007

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Cell division is regulated by telomere length. Telomere shortening and DNA exchange influence cell lifespan, leading to a phase transition between finite proliferation and immortality based on these dynamics.

Area of Science:

Cell biology
Mathematical modeling
Genetics

Background:

Telomeres shorten with each cell division.
Telomere length critically regulates cellular senescence.
Inter-cell telomere DNA exchange introduces variability.

Purpose of the Study:

To model cell division dynamics influenced by telomere length.
To investigate the relationship between telomere shortening, DNA exchange, and cellular lifespan.
To identify conditions leading to cellular immortality versus senescence.

Main Methods:

Developed a biased branching-diffusion model.
Incorporated systematic telomere shortening and random DNA exchange.
Applied first-passage time analysis with absorbing boundary conditions.

Related Experiment Videos

Main Results:

Identified a critical phase transition in cell population lifespan.
Demonstrated that telomere dynamics govern the transition between finite and infinite proliferation.
Quantified the influence of shortening, fluctuations, and division rates on senescence.

Conclusions:

Cellular proliferative potential is intrinsically linked to telomere dynamics.
The model predicts conditions for cellular immortality.
Understanding these mechanisms is key for aging and cancer research.