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Evolution of New Traits in Microbes01:24

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
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Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...
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Gene Evolution - Fast or Slow?

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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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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Convergent Evolution01:54

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...
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A Practical Guide to Phage- and Robotics-Assisted Near-Continuous Evolution
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Directed evolution: new parts and optimized function.

Michael J Dougherty1, Frances H Arnold

  • 1Division of Chemistry & Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA.

Current Opinion in Biotechnology
|September 2, 2009
PubMed
Summary
This summary is machine-generated.

Directed evolution aids in discovering and optimizing biological molecules for robust systems. This method complements rational engineering by enabling functional diversification without full mechanistic insight.

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Area of Science:

  • Synthetic Biology
  • Molecular Engineering
  • Biotechnology

Background:

  • Constructing robust biological systems necessitates improved methods for discovering functional molecules and optimizing their assembly.
  • Rational engineering approaches require detailed mechanistic understanding, which is often a limitation.

Purpose of the Study:

  • To highlight directed evolution as a powerful complementary approach to rational engineering for biological system construction.
  • To showcase the utility of directed evolution in generating novel biological parts and pathways.

Main Methods:

  • Employing directed evolution strategies to achieve functional diversification and optimization.
  • Utilizing clever selection schemes to guide the evolution process.
  • Applying these methods in bacterial systems for genetic circuits and metabolic pathways.

Main Results:

  • Directed evolution enables functional diversification and optimization even without complete mechanistic understanding.
  • This approach has successfully generated new components for genetic circuits.
  • New systems for cell-cell communication and non-natural metabolic pathways have been created in bacteria.

Conclusions:

  • Directed evolution is a valuable tool for advancing synthetic biology and molecular engineering.
  • It offers a practical alternative or complement to rational design for creating functional biological systems.
  • The successful application in bacteria demonstrates its broad potential for biological innovation.