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Related Concept Videos

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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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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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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Related Experiment Video

Updated: Feb 3, 2026

Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli
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Evolution at the Cutting Edge: CRISPR-Mediated Directed Evolution.

Timothy R Abbott1, Lei S Qi2

  • 1Department of Bioengineering, Stanford University, Stanford, CA 94305, USA.

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Summary
This summary is machine-generated.

Scientists developed a new CRISPR-Cas9 technology to continuously diversify specific genomic loci. This innovation combines gene editing with error-prone DNA polymerases for enhanced genetic variation.

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Last Updated: Feb 3, 2026

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Area of Science:

  • Genetics
  • Molecular Biology
  • Biotechnology

Background:

  • Genetic diversification is crucial for research and therapeutic development.
  • Existing methods for genomic locus diversification can be limited in scope and efficiency.

Purpose of the Study:

  • To develop a novel technology for continuous diversification of specific genomic loci.
  • To combine CRISPR-Cas9 gene editing with error-prone DNA polymerases for enhanced genetic variation.

Main Methods:

  • Utilized the CRISPR-Cas9 system for targeted DNA modification.
  • Integrated error-prone DNA polymerases to introduce continuous mutations at specific genomic sites.

Main Results:

  • Successfully demonstrated continuous diversification of targeted genomic loci.
  • The combined approach allows for sustained introduction of genetic variations.

Conclusions:

  • This new technology offers a powerful tool for generating genetic diversity.
  • The method has potential applications in synthetic biology, drug discovery, and evolutionary studies.