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Multigenerational silencing dynamics control cell aging.

Yang Li1, Meng Jin2,3, Richard O'Laughlin4

  • 1Section of Molecular Biology, Division of Biological Sciences, University of California, San Diego, La Jolla, CA 92093.

Proceedings of the National Academy of Sciences of the United States of America
|October 27, 2017
PubMed
Summary
This summary is machine-generated.

Cellular aging rates vary even in identical cells. This study reveals that the timing of heterochromatin silencing loss in yeast cells dictates their lifespan, offering insights into aging processes.

Keywords:
chromatin silencingcomputational modelingmicrofluidicsreplicative agingsingle-cell analysis

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Area of Science:

  • Cellular and Molecular Biology
  • Genetics and Epigenetics
  • Aging Research

Background:

  • Cellular aging contributes to diseases like cancer and neurodegenerative disorders.
  • Understanding cell-to-cell aging variability is crucial, despite known aging factors like oxidative stress and genomic instability.

Purpose of the Study:

  • To investigate the role of temporal patterns in heterochromatin silencing loss in regulating yeast cell lifespan.
  • To explore the relationship between cell-to-cell variability in aging dynamics and overall longevity.

Main Methods:

  • Utilized microfluidic technologies for tracking replicative aging in single yeast cells.
  • Employed computational modeling alongside experimental approaches to analyze silencing dynamics.
  • Focused on the heterochromatic ribosomal DNA and the Sir2 deacetylase.

Main Results:

  • Identified sporadic waves of silencing loss during early aging, followed by sustained loss preceding cell death.
  • Demonstrated that the duration of the intermittent silencing phase significantly determines individual cell lifespan.
  • Found that intermittent silencing dynamics, dependent on Sir2, promote longevity, while sustained silencing or loss shortens lifespan.

Conclusions:

  • The temporal dynamics of heterochromatin silencing loss directly influence cellular aging and lifespan.
  • Intermittent silencing is crucial for longevity, whereas sustained silencing or loss is detrimental.
  • Findings suggest potential for temporally controlled strategies to extend lifespan.