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Methods to Study Changes in Inherent Protein Aggregation with Age in Caenorhabditis elegans
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Widespread Proteome Remodeling and Aggregation in Aging C. elegans.

Dirk M Walther1, Prasad Kasturi2, Min Zheng2

  • 1Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152 Martinsried, Germany.

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Aging causes significant proteome imbalance in C. elegans, with protein aggregation increasing. This decline in proteostasis is modulated by aging genes, suggesting a protective role for chaperone-enriched aggregates.

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Area of Science:

  • Gerontology
  • Molecular Biology
  • Proteomics

Background:

  • Aging is linked to declining proteostasis, impacting cellular function.
  • The specific changes in proteome composition during aging are not well understood.

Purpose of the Study:

  • To investigate how aging affects the abundance and composition of the proteome.
  • To explore the relationship between proteome imbalance, protein aggregation, and aging in C. elegans.

Main Methods:

  • Quantitative proteomic profiling of over 5,000 proteins across the lifespan of C. elegans.
  • Analysis of protein abundance changes in wild-type, long-lived (daf-2), and short-lived (daf-16) mutant strains.
  • Characterization of protein aggregation and its association with protein properties and chaperones.

Main Results:

  • One-third of proteins showed at least a 2-fold change in abundance during aging, leading to severe proteome imbalance.
  • Aging-related proteome changes were attenuated in daf-2 mutants and enhanced in daf-16 mutants.
  • Ribosomal proteins decreased, while proteasome complexes increased; widespread protein aggregation occurred, driven by abundant, less soluble proteins.

Conclusions:

  • Proteome imbalance and aggregation are key features of aging in C. elegans.
  • The aggregation process is influenced by genetic factors affecting lifespan.
  • Sequestering proteins into chaperone-enriched aggregates may be a protective mechanism against proteostasis decline during aging.