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Methods to Study Changes in Inherent Protein Aggregation with Age in Caenorhabditis elegans
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Protein aggregates are associated with replicative aging without compromising protein quality control.

Juha Saarikangas1, Yves Barral1

  • 1Institute of Biochemistry, Eidgenössische Technische Hochschule Zürich, Zürich, Switzerland.

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Summary

Yeast mother cells form an early aging protein aggregate, asymmetrically inherited. This deposit enhances proteasome function but loss of Hsp42 prolongs lifespan, suggesting protein aggregation

Keywords:
S. cerevisiaeagingasymmetric cell divisioncell biologydevelopmental biologydifferentiationfate determinationprotein aggregationprotein quality controlstem cells

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Area of Science:

  • Cellular aging
  • Molecular biology
  • Yeast genetics

Background:

  • Cellular lineage differentiation relies on asymmetric segregation of fate determinants.
  • In budding yeast, aging factors segregate to the mother lineage, with unclear outcomes.

Purpose of the Study:

  • To investigate the consequences of protein aggregation during early replicative aging in yeast.
  • To understand the role of Hsp42 in the formation and inheritance of protein aggregates.

Main Methods:

  • Microscopy to observe protein aggregate formation and inheritance.
  • Proteostasis assays to assess protein degradation and aggregate clearance.
  • Genetic analysis of Hsp42 function and its impact on lifespan.

Main Results:

  • Yeast mother cells form a single, asymmetrically inherited protein aggregate during early aging.
  • Aggregate formation did not correlate with stress or proteostasis decline, but enhanced proteasome substrate degradation.
  • Hsp42 is crucial for collecting specific client proteins, including the prion Sup35.
  • Loss of Hsp42 led to symmetric inheritance and extended mother cell lifespan.

Conclusions:

  • Protein aggregation is an early, aging-associated differentiation event in yeast.
  • This aggregation has a dual role in organismal fitness, impacting both aging and proteostasis.
  • Asymmetric inheritance of protein aggregates influences yeast lifespan and cellular fate.