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Related Concept Videos

Eukaryotic Evolution01:24

Eukaryotic Evolution

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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.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
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The Fossil Record02:56

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The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
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Three-Domain System of Life01:21

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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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What is Evolutionary History?02:35

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Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
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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...
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The Evidence for Evolution02:55

The Evidence for Evolution

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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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Updated: Dec 15, 2025

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
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Published on: August 14, 2018

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Insights into eukaryogenesis from the fossil record.

Susannah M Porter1

  • 1Department of Earth Science, University of California at Santa Barbara, Santa Barbara, CA 93106, USA.

Interface Focus
|July 10, 2020
PubMed
Summary

Eukaryogenesis, the origin of eukaryotic cells, may be studied using the fossil record. This research suggests a late Mesoproterozoic origin for eukaryotes, challenging previous timelines and models.

Keywords:
eukaryogenesiseukaryote evolutioneukaryote fossil recordmitochondriaproterozoicsteranes

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Area of Science:

  • Origin and evolution of eukaryotic cells
  • Paleobiology and Precambrian paleontology

Background:

  • Eukaryogenesis, the emergence of eukaryotic cells, is a long-standing scientific puzzle.
  • Prevailing models suggest eukaryogenesis predates recognizable fossil evidence, limiting paleontological study.
  • The fossil record's limitations, such as poor preservation of key eukaryotic features, have contributed to this assumption.

Purpose of the Study:

  • To propose an alternative scenario for early eukaryote evolution, suggesting a late Mesoproterozoic origin for the eukaryotic crown group.
  • To argue that eukaryogenesis is amenable to study using the fossil record.
  • To review proxy records for key eukaryotic characters and infer their evolutionary order.

Main Methods:

  • Review of proxy records for four crown group eukaryotic characters: cyst formation (excystment structures), complex cytoskeleton (spines/pylomes), sterol synthesis (steranes), and aerobic respiration (oxic environment eukaryotes).
  • Analysis of fossil evidence to establish the appearance of these characters in the geological timeline.
  • Comparison of proposed evolutionary timeline with prevailing models.

Main Results:

  • Evidence suggests cyst formation and complex cytoskeleton appeared by the late Paleoproterozoic.
  • Sterol synthesis is indicated in the late Mesoproterozoic or early Neoproterozoic.
  • The origin of aerobic respiration remains less certain but may have occurred during the Mesoproterozoic.

Conclusions:

  • A late Mesoproterozoic origin for the eukaryotic crown group is proposed, contrasting with the late Paleoproterozoic origin in current models.
  • The fossil record, through proxy evidence, can provide insights into eukaryogenesis.
  • The study provides a framework for using paleontological proxies to reconstruct the evolutionary sequence of key eukaryotic innovations.