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Related Concept Videos

Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

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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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Mutations01:35

Mutations

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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
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Genome Copying Errors02:46

Genome Copying Errors

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DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their  survival. Therefore, the copying errors are checked and repaired at three levels.
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Mismatch Repair01:20

Mismatch Repair

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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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Overview of DNA Repair02:25

Overview of DNA Repair

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In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
Chemically...
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Proofreading01:31

Proofreading

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Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore,  it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
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Updated: May 23, 2025

Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli
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Deaminase-driven random mutation enables efficient DNA mutagenesis for protein evolution.

Ying Hao1, Tong-Tong Ji1, Shu-Yi Gu2

  • 1College of Chemistry and Molecular Sciences, Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan University Wuhan 430071 China bfyuan@whu.edu.cn yqfeng@whu.edu.cn.

Chemical Science
|April 24, 2025
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Summary

Protein evolution is enhanced by deaminase-driven random mutation (DRM), a new DNA mutagenesis strategy. DRM offers higher mutation frequency and diversity than error-prone PCR, accelerating the discovery of novel protein mutants.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Engineering

Background:

  • Protein evolution is vital for creating proteins with new functions.
  • DNA mutagenesis is a key step in protein evolution.
  • Current methods like error-prone PCR (epPCR) have limitations in mutation efficiency and diversity.

Purpose of the Study:

  • To develop a novel DNA mutagenesis strategy with higher efficiency and diversity than epPCR.
  • To introduce a broad spectrum of mutations in a single round of mutagenesis.
  • To facilitate the discovery of novel protein mutants.

Main Methods:

  • Developed deaminase-driven random mutation (DRM) using engineered cytidine deaminase A3A-RL and adenosine deaminase ABE8e.
  • Introduced C-to-T, G-to-A, A-to-G, and T-to-C mutations on both DNA strands.
  • Compared DRM to epPCR in terms of mutation frequency and diversity.

Main Results:

  • DRM demonstrated a 14.6-fold higher DNA mutation frequency compared to epPCR.
  • DRM produced a 27.7-fold greater diversity of mutation types than epPCR.
  • DRM enables a more comprehensive exploration of the genetic landscape for protein engineering.

Conclusions:

  • DRM is a powerful tool for protein evolution, offering superior mutagenic capability.
  • This strategy significantly enhances the discovery of novel and improved protein mutants.
  • DRM provides high-quality DNA products for protein engineering applications.