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Proteome evolution under non-substitutable resource limitation.

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Organisms adapt to resource limitation by evolving core metabolic functions, even under different nutrient scarcities. This evolutionary adaptation improves how efficiently cells convert resources like nitrogen and phosphorus into biomass.

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Area of Science:

  • Ecology and Evolutionary Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Resource limitation significantly influences organismal ecological and evolutionary trajectories.
  • Organisms exhibit short-term plastic responses to resource scarcity, altering molecular phenotypes like protein expression.
  • The long-term evolution of molecular phenotypes under sustained resource limitation remains poorly understood.

Purpose of the Study:

  • To investigate the evolutionary adaptation of molecular phenotypes in response to diverse, non-substitutable resource limitation regimes.
  • To explore the proteomic changes underlying adaptation in the green alga Chlamydomonas reinhardtii.
  • To determine if adaptation pathways converge or diverge across different resource limitation scenarios.

Main Methods:

  • Experimental evolution of Chlamydomonas reinhardtii under distinct resource limitation conditions.
  • Proteomic analysis to quantify changes in protein expression profiles.
  • Comparative analysis of proteomic data to identify convergent evolutionary patterns.

Main Results:

  • Convergent proteomic evolution was observed in core metabolic pathways, including the Calvin-Benson cycle and gluconeogenesis, across varied resource limitations.
  • No proteomic evidence suggested optimization for the uptake of specific limiting resources.
  • Adaptation trends were similar across different types of non-substitutable resource limitations.
  • Evolutionary changes in core metabolic proteins correlated with enhanced assimilation efficiency of nitrogen and phosphorus into biomass.

Conclusions:

  • Organisms exhibit convergent molecular evolution in core metabolic functions when facing different types of resource limitations.
  • Adaptation to resource scarcity involves a general improvement in resource assimilation efficiency rather than specific uptake mechanisms.
  • The study provides insights into the evolutionary strategies of organisms under environmental stress and resource constraints.