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Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
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Evolutionary tradeoffs in cellular composition across diverse bacteria.

Christopher P Kempes1,2,3, Lawrence Wang2, Jan P Amend4,5

  • 1The Santa Fe Institute, Santa Fe, NM, USA.

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|April 6, 2016
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Summary
This summary is machine-generated.

This study reveals how bacterial cell composition, including DNA, RNA, and protein content, changes with size. These cellular shifts dictate physiological functions and metabolic rates across diverse bacteria.

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Area of Science:

  • Microbiology
  • Cell Biology
  • Systems Biology

Background:

  • Understanding the link between cellular composition and physiological function is crucial in biology.
  • While species-specific relationships are known, cross-species predictive frameworks for cellular tradeoffs are needed.

Purpose of the Study:

  • To comprehensively analyze how bacterial cellular composition varies with cell volume across diverse species.
  • To connect these compositional shifts to physiological function and metabolism.
  • To elucidate mechanistic principles governing bacterial size limits and metabolic scaling.

Main Methods:

  • Analysis of genomic, protein, cellular envelope, RNA, and ribosomal content across bacteria spanning five orders of magnitude in size.
  • Investigating trends in cellular composition relative to cell volume.
  • Examining the energetic basis of metabolic rate scaling.

Main Results:

  • Bacterial cell size is constrained by physical limits: DNA/protein content at the small end and ribosome capacity at the large end.
  • Protein content scaling is more complex than simple proportionality to genome size.
  • Ribosome number is directly explained by biosynthesis demands.
  • Metabolic rate scales superlinearly with cellular components.

Conclusions:

  • Bacterial cell size is determined by fundamental biophysical constraints on molecular content and biosynthesis.
  • Cellular composition shifts systematically explain metabolic scaling and functional tradeoffs across bacterial diversity.
  • This work provides a mechanistic framework for understanding bacterial size-