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Viral Mutations

Viral Mutations

A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material for adaptive...

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Related Experiment Video

Updated: Jun 6, 2026

Engineering and Evolution of Synthetic Adeno-Associated Virus (AAV) Gene Therapy Vectors via DNA Family Shuffling

Engineering and Evolution of Synthetic Adeno-Associated Virus (AAV) Gene Therapy Vectors via DNA Family Shuffling

Published on: April 2, 2012

Directed adenovirus evolution using engineered mutator viral polymerases.

Taco G Uil¹, Jort Vellinga, Jeroen de Vrij

¹Department of Molecular Cell Biology, Leiden University Medical Center, Leiden, 2300 RC, The Netherlands.

Nucleic Acids Research

|December 9, 2010

Summary

Researchers developed a novel accelerated evolution method using mutated adenoviruses (Ads) to create better oncolytic and gene therapy vectors. This approach enhances viral mutation rates, leading to improved cytolytic activity and optimized Ad vectors.

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A Simple and Efficient Approach to Construct Mutant Vaccinia Virus Vectors

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Published on: October 30, 2016

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Engineering and Evolution of Synthetic Adeno-Associated Virus (AAV) Gene Therapy Vectors via DNA Family Shuffling

Engineering and Evolution of Synthetic Adeno-Associated Virus (AAV) Gene Therapy Vectors via DNA Family Shuffling

Published on: April 2, 2012

A Simple and Efficient Approach to Construct Mutant Vaccinia Virus Vectors

A Simple and Efficient Approach to Construct Mutant Vaccinia Virus Vectors

Published on: October 30, 2016

Area of Science:

Virology
Molecular Biology
Biotechnology

Background:

Adenoviruses (Ads) are widely used in oncolytic and gene therapy.
Current Ad vector development relies on rational design, often limited by incomplete understanding of Ad biology.
A need exists for novel methods to generate and optimize Ad vectors.

Purpose of the Study:

To develop a general method for generating and optimizing adenoviral vectors using an accelerated evolution approach.
To engineer Ad polymerase mutants with increased intrinsic mutation rates.
To isolate Ad variants with enhanced therapeutic properties, specifically improved cytolytic activity.

Main Methods:

Site-specific substitution of Ad polymerase residues in the nucleotide binding pocket and exonuclease domain.
Generation of Ad polymerase mutants with increased mutation rates.
Deep sequencing to identify and characterize mutator activities.
Directed evolution using engineered mutator viruses to isolate variants with improved cytolytic activity.

Main Results:

Several Ad polymerase mutants were created that support viral replication but increase the mutation rate.
The strongest mutators involved substitutions at the exonuclease active site, affecting ssDNA binding.
Directed evolution yielded Ad mutants with significantly improved cytolytic activity.
These improved mutants frequently exhibited a mutation in a splice acceptor site upstream of the adenovirus death protein (ADP) gene, leading to deregulated E3 transcript splicing and early ADP expression.

Conclusions:

The mutator Ad polymerase-based accelerated evolution approach is a viable general method for generating and optimizing Ad vectors.
This strategy can overcome limitations of rational design by introducing genetic diversity.
The identified Ad mutants with enhanced cytolytic activity offer potential for improved oncolytic virotherapy applications.