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The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
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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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The “tree of life” describes the evolution of life and the evolutionary relationships between organisms. The root of the tree is the common ancestor to all life on Earth. All other species radiate from this point, much like the branches of a tree. The numerous tips of these branches on the tree of life represent every living, or extant, species. Extinct species, which are species that no longer exist, can be found towards the center of the tree. Currently, these organisms, both...
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On the evolution of bacterial multicellularity.

Nicholas A Lyons1, Roberto Kolter1

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Bacteria exhibit diverse multicellularity, offering insights into its evolutionary origins. Their experimental tractability and genomic data help explore selective pressures and convergent evolution in microbial communities.

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genomics

Background:

  • Multicellularity is a key evolutionary innovation with numerous examples in bacteria.
  • Bacteria provide a model system to study the fundamental origins of multicellular life.
  • Diverse bacterial multicellular forms and available genomic data facilitate research.

Purpose of the Study:

  • To discuss examples of bacterial multicellular behaviors.
  • To explore selective pressures driving the evolution of bacterial multicellularity.
  • To investigate potential origins, intermediate stages, and the inevitability of convergent multicellular forms.

Main Methods:

  • Review of existing literature on bacterial multicellularity.
  • Analysis of genomic data for insights into evolutionary pathways.
  • Comparative analysis of diverse multicellular bacterial forms.

Main Results:

  • Identification of various multicellular behaviors across bacterial species.
  • Hypotheses on selective pressures (e.g., resource competition, predation avoidance) favoring multicellularity.
  • Discussion of potential transitional stages from unicellular to multicellular life.

Conclusions:

  • Bacterial multicellularity is widespread and diverse.
  • Convergent evolution suggests multicellularity may be an inevitable outcome under certain conditions.
  • Bacteria are crucial for understanding the fundamental principles of multicellular evolution.