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Eukaryotic Evolution01:24

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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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Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
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Ribosomal RNA (rRNA) sequence analysis revealed three distinct groups of cells: eukaryotes, bacteria, and archaea. In 1978, Carl R. Woese proposed the concept of domains, a taxonomic level above kingdoms, to differentiate these groups. He suggested that archaea and bacteria, despite their similar appearance, represent separate domains. Domains differ in rRNA, membrane lipid structure, transfer RNA, and antibiotic sensitivity.In this classification, animals, plants, and fungi belong to the...
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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
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Layers of Symbiosis - Visualizing the Termite Hindgut Microbial Community
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Symbiosis in eukaryotic evolution.

Purificación López-García1, Laura Eme2, David Moreira1

  • 1Ecologie Systématique Evolution, CNRS, Université Paris-Sud, Université Paris-Saclay, AgroParisTech, 91400 Orsay, France.

Journal of Theoretical Biology
|March 4, 2017
PubMed
Summary
This summary is machine-generated.

Lynn Margulis proposed that eukaryotic cells originated from symbiosis. Modern research, including phylogenomics, supports this symbiogenesis theory, though the exact evolutionary path remains under investigation.

Keywords:
ArchaeaEukaryogenesisEukaryotic originsMitochondriaSymbiosisSyntrophy

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Area of Science:

  • Evolutionary Biology
  • Microbiology
  • Cell Biology

Background:

  • Lynn Margulis proposed the symbiogenesis theory for eukaryotic cell origins 50 years ago.
  • Symbiosis and syntrophic cooperation are crucial in microbial ecosystems.
  • The symbiogenetic origin of mitochondria and chloroplasts is well-established.

Purpose of the Study:

  • To review current knowledge on symbiotic interactions and their evolutionary impact.
  • To discuss the status of eukaryogenetic models.
  • To identify challenges and perspectives in reconstructing the evolutionary path to eukaryotes.

Main Methods:

  • Review of existing literature on symbiosis and eukaryogenesis.
  • Analysis of phylogenomic data supporting symbiogenesis.
  • Examination of microbial diversity and metabolic cooperation.

Main Results:

  • Symbiogenesis is a widely supported mechanism for eukaryotic cell evolution.
  • Microbial diversity and syntrophic cooperation highlight the importance of symbiosis.
  • Phylogenomic advancements provide further evidence for the symbiogenetic origin of eukaryotes.

Conclusions:

  • While symbiogenesis is largely verified, the precise timing, location, and mechanisms of eukaryotic cell evolution are still unclear.
  • Further research is needed to fully reconstruct the evolutionary journey to eukaryotes.
  • Symbiotic interactions remain a key focus for understanding the increase in cellular complexity.