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The Evidence for Evolution02:55

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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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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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Related Experiment Video

Updated: Jan 21, 2026

Biochemical Reconstitution of Steroid Receptor&#x2022;Hsp90 Protein Complexes and Reactivation of Ligand Binding
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Biochemical Reconstitution of Steroid Receptor•Hsp90 Protein Complexes and Reactivation of Ligand Binding

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Steroid receptors and vertebrate evolution.

Michael E Baker1

  • 1Division of Nephrology-Hypertension, Department of Medicine, 0693, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0693, USA.

Molecular and Cellular Endocrinology
|August 4, 2019
PubMed
Summary
This summary is machine-generated.

Steroid hormone receptors evolved in early chordates, preceding vertebrates. Their emergence at key evolutionary points highlights their role in vertebrate development and success.

Keywords:
AldosteroneAmphioxusAndrogenEstrogenEvolutionGlucocorticoidLampreyProgesteroneSharksSteroids

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Area of Science:

  • Evolutionary Biology
  • Genomics
  • Endocrinology

Background:

  • Vertebrates emerged in the fossil record approximately 542-515 million years ago.
  • Steroid hormone receptors, including those for adrenal and sex steroids, are relatively recent in evolutionary terms.

Purpose of the Study:

  • To trace the evolutionary origins and diversification of adrenal and sex steroid receptors.
  • To understand the role of these receptors in the evolutionary success of vertebrates.

Main Methods:

  • Comparative genomics analyses across diverse taxa, including bacteria, yeast, plants, invertebrates, and vertebrates.
  • Phylogenetic analysis to identify the appearance and duplication events of steroid receptor genes.

Main Results:

  • Estrogen and 3-ketosteroid receptors first appeared in basal chordates (amphioxus).
  • Receptor duplication in jawless vertebrates led to progesterone and corticoid receptors.
  • Distinct androgen, glucocorticoid, mineralocorticoid, and estrogen receptors evolved in cartilaginous fishes.
  • Aldosterone synthase evolved in lungfish, preceding terrestrial vertebrates.

Conclusions:

  • Steroid receptors evolved at critical junctures in vertebrate evolution.
  • These receptors act as master regulators for key physiological processes, contributing to vertebrate evolutionary success.
  • The evolution of steroid signaling pathways was crucial for vertebrate adaptation and diversification.