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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.
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Prokaryotic vs. Eukaryotic Cells01:28

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Prokaryotic and eukaryotic cells represent two fundamental types of cellular organization, differing significantly in structure, complexity, and function. These distinctions underpin the biological diversity seen across domains of life.Prokaryotic Cell CharacteristicsProkaryotic cells, exemplified by bacteria and archaea, are structurally simple and lack membrane-bound organelles, including a nucleus. Their genetic material consists of a single, circular DNA molecule in the nucleoid region,...
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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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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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Eukaryotic Compartmentalization01:37

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One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry out specialized functions. Since biological membranes are only selectively permeable to solutes, they help create a compartment with controlled conditions inside an organelle. These microenvironments are tailored to the organelle's specific functions and help isolate them from the surrounding cytosol.
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What are Cells?01:07

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Cells are the smallest and basic units of life, whether it is a single cell that forms the entire organism, e.g., in a bacterium or trillions of them, e.g., in humans. No matter what organism a cell is a part of, they share specific characteristics.
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Defining eukaryotes to dissect eukaryogenesis.

Philip C J Donoghue1, Chris Kay1, Anja Spang2

  • 1Bristol Palaeobiology Group, School of Earth Sciences, Life Sciences Building, University of Bristol, Bristol BS8 1TQ, UK.

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|September 12, 2023
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Summary
This summary is machine-generated.

The origin of eukaryotes remains debated, but defining them phylogenetically offers clarity. Absolute dating of gene duplicates may resolve the sequence of key evolutionary steps in eukaryogenesis.

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Area of Science:

  • Evolutionary Biology
  • Genomics
  • Molecular Evolution

Background:

  • The origin of eukaryotes (eukaryogenesis) is a complex and contentious topic in evolutionary biology.
  • Multiple theories exist, often conflicting, regarding the sequence of acquisition of eukaryotic traits.
  • Disagreement stems from differing definitions of what constitutes a eukaryote.

Purpose of the Study:

  • To propose a phylogenetic definition of eukaryotes to clarify competing hypotheses of eukaryogenesis.
  • To identify testable predictions for distinguishing between different evolutionary scenarios.
  • To outline a method for resolving debates on the timing of key evolutionary events.

Main Methods:

  • Phylogenetic analysis to define eukaryotes and distinguish hypotheses.
  • Examination of gene origins and duplications related to eukaryotic traits.
  • Absolute dating of gene duplicates to establish temporal order of evolutionary events.

Main Results:

  • A phylogenetic definition clarifies agreements and disagreements among eukaryogenesis hypotheses.
  • Some hypotheses are distinguishable based on the phylogenetic origins of genes.
  • Hypotheses differing only in the order of events (e.g., mitochondrial endosymbiosis, nuclear assembly) are not yet phylogenetically distinguishable.

Conclusions:

  • Defining eukaryotes phylogenetically provides a framework for resolving the eukaryogenesis debate.
  • Absolute dating of specific gene duplicates offers a novel approach to determine the sequence of evolutionary steps.
  • This method has the potential to definitively distinguish between competing theories of eukaryote origins.