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Area of Science:

  • Microbiology
  • Epigenetics
  • Evolutionary Biology

Background:

  • Microbes face constant environmental fluctuations requiring adaptive responses.
  • Past environmental exposures can prime microbes for future challenges, even in naive daughter cells.
  • This microbial memory, or history-dependent behavior (HDB), is often epigenetic and population-heterogeneous.

Purpose of the Study:

  • To review examples of HDB in microbes, focusing on fluctuating environments.
  • To highlight mechanisms underlying HDB and its role in cellular fitness.
  • To explore the evolutionary implications of HDB.

Main Methods:

  • Review of existing literature on microbial HDB.
  • Analysis of HDB in fluctuating carbon environments as a case study.
  • Discussion of lag time as a proxy for measuring HDB.

Main Results:

  • HDB allows accelerated responses to returning environmental cues.
  • Epigenetic mechanisms and metabolic state significantly influence HDB.
  • Population heterogeneity in HDB may serve as a bet-hedging strategy.

Conclusions:

  • Microbial HDB is a crucial adaptive mechanism for survival in dynamic environments.
  • The metabolic state of a cell is a key determinant of its HDB.
  • Understanding HDB provides insights into microbial evolution and adaptation strategies.