Stochastic and Age-Dependent Proteostasis Decline Underlies Heterogeneity in Heat-Shock Response Dynamics.
Nadia Vertti-QuinteroSimon BergerXavier Casadevall I SolvasCyril StatzerJillian AnnisPeter RuppenStavros StavrakisCollin Yvès EwaldRudiyanto GunawanAndrew J deMelloPublished in: Small (Weinheim an der Bergstrasse, Germany) (2021)
Significant non-genetic stochastic factors affect aging, causing lifespan differences among individuals, even those sharing the same genetic and environmental background. In Caenorhabditis elegans, differences in heat-shock response (HSR) are predictive of lifespan. However, factors contributing to the heterogeneity of HSR are still not fully elucidated. Here, the authors characterized HSR dynamics in isogenic C. elegans expressing GFP reporter for hsp-16.2 for identifying the key contributors of HSR heterogeneity. Specifically, microfluidic devices that enable cross-sectional and longitudinal measurements of HSR dynamics in C. elegans at different scales are developed: in populations, within individuals, and in embryos. The authors adapted a mathematical model of HSR to single C. elegans and identified model parameters associated with proteostasis-maintenance of protein homeostasis-more specifically, protein turnover, as the major drivers of heterogeneity in HSR dynamics. It is verified that individuals with enhanced proteostasis fidelity in early adulthood live longer. The model-based comparative analysis of protein turnover in day-1 and day-2 adult C. elegans revealed a stochastic-onset of age-related proteostasis decline that increases the heterogeneity of HSR capacity. Finally, the analysis of C. elegans embryos showed higher HSR and proteostasis capacity than young adults and established transgenerational contribution to HSR heterogeneity that depends on maternal age.
Keyphrases
- heat shock
- single cell
- cross sectional
- young adults
- heat stress
- heat shock protein
- healthcare
- high throughput
- protein protein
- oxidative stress
- genome wide
- bone mineral density
- binding protein
- crispr cas
- body mass index
- risk assessment
- amino acid
- circulating tumor cells
- physical activity
- small molecule
- body composition
- endoplasmic reticulum
- preterm birth
- weight gain
- pregnancy outcomes
- wild type