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Related Concept Videos

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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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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Related Experiment Video

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Molecular Evolution of the Tre Recombinase
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Is molecular evolution faster in the tropics?

Matthew G Orton1,2, Jacqueline A May1, Winfield Ly2

  • 1Department of Integrative Biology & Biodiversity Institute of Ontario, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1, Canada.

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The evolutionary speed hypothesis proposes faster molecular evolution in warmer climates. This comprehensive animal study found no strong evidence supporting this, suggesting molecular clocks are consistent across latitudes.

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Area of Science:

  • Evolutionary Biology
  • Molecular Evolution
  • Genomics

Background:

  • The evolutionary speed hypothesis (ESH) posits higher molecular evolutionary rates in warmer environments.
  • Previous studies on ESH in animals, often using limited lineages like Chordata, yielded inconsistent results.
  • The latitudinal diversity gradient remains a key question in evolutionary biology.

Purpose of the Study:

  • To comprehensively test the evolutionary speed hypothesis across major animal phyla using DNA barcode data.
  • To investigate the relationship between latitude, environmental temperature, and molecular evolutionary rates in animals.
  • To assess the general applicability of molecular clocks across different latitudes.

Main Methods:

  • Analysis of public DNA barcode sequences from the cytochrome c oxidase subunit I (COI) gene.
  • Informatics pairing of latitudinally-separated taxa from six major animal phyla (Arthropoda, Chordata, Mollusca, Annelida, Echinodermata, Cnidaria).
  • Statistical analysis of molecular rates in 8037 lineage pairs to compare equatorial vs. higher-latitude lineages.

Main Results:

  • Over half of the analyzed lineage pairs (51.6%) showed higher molecular rates in equatorial lineages.
  • A statistically significant pattern was detected, but the effect size suggests ESH is not a universal driver.
  • Molecular evolutionary rates on the COI gene showed general consistency across latitudes.

Conclusions:

  • The evolutionary speed hypothesis is not strongly supported as a universal mechanism for the latitudinal diversity gradient in animals.
  • COI molecular clocks appear generally applicable across latitudinal gradients.
  • Automation is effective for analyzing large-scale DNA barcode datasets, facilitating comprehensive evolutionary studies.