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Related Concept Videos

Eukaryotic Evolution01:24

Eukaryotic Evolution

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.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
Three-Domain System of Life01:21

Three-Domain System of Life

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...
The Tree of Life - Bacteria, Archaea, Eukaryotes02:40

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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 extant and...
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The origin of life on Earth is a complex and enigmatic event rooted in ancient biochemical processes and geological conditions. Experimental evidence supports the hypothesis that life began with the spontaneous formation of organic molecules such as RNA nucleotides, amino acids, and lipids under early Earth conditions. Factors like volcanic activity, intense UV radiation, and a reducing atmosphere without free oxygen likely facilitated these reactions. Hydrothermal vents on the ocean floor are...
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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
08:57

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

Published on: August 14, 2018

The archaebacterial origin of eukaryotes.

Cymon J Cox1, Peter G Foster, Robert P Hirt

  • 1Department of Zoology, Natural History Museum, Cromwell Road, London, SW7 5BD, United Kingdom. cymon.cox@gmail.com

Proceedings of the National Academy of Sciences of the United States of America
|December 17, 2008
PubMed
Summary

The eocyte hypothesis, suggesting eukaryotes originated within Archaebacteria, is better supported by genetic analysis than the traditional 3-domains tree. This study analyzed 53 genes to resolve early eukaryotic evolution and evolutionary relationships.

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Area of Science:

  • Evolutionary Biology
  • Genomics
  • Molecular Phylogenetics

Background:

  • The origin of eukaryotic cells is a fundamental question in evolutionary biology.
  • Competing hypotheses exist regarding the evolutionary lineage of eukaryotes, including the traditional 3-domains tree and the eocyte hypothesis.
  • The eocyte hypothesis posits that eukaryotes originated within Archaebacteria, specifically sharing a common ancestor with the Crenarchaeota (eocytes).

Purpose of the Study:

  • To investigate the evolutionary origin of the eukaryotic genetic apparatus and nuclear lineage.
  • To compare the support for the 3-domains tree of life versus the eocyte hypothesis using extensive genetic data.
  • To address the impact of compositional heterogeneity on phylogenetic reconstruction.

Main Methods:

  • Phylogenetic analysis of 53 genes involved in nucleic acid replication, transcription, and translation.
  • Utilized phylogenetic models accounting for compositional heterogeneity across the evolutionary tree.
  • Assessed the fit between different evolutionary models and the analyzed genetic data.

Main Results:

  • Phylogenetic analyses favored a topology supporting the eocyte hypothesis.
  • The results indicated that Archaebacteria are not a monophyletic group, contrary to the 3-domains tree.
  • The study demonstrated the importance of accounting for compositional heterogeneity in reconstructing deep evolutionary relationships.

Conclusions:

  • The findings provide strong support for the eocyte hypothesis regarding the origin of eukaryotes.
  • This challenges the traditional view of the 3-domains tree of life and Archaebacterial monophyly.
  • Accurate reconstruction of ancient evolutionary events requires methods that mitigate biases from compositional heterogeneity.