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Related Concept Videos

Homologous Recombination02:31

Homologous Recombination

The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
Multi-species Conserved Sequences02:51

Multi-species Conserved Sequences

Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale  studies have provided new insights into the evolutionary relationship between organisms.
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved DNA...
Gene Duplication and Divergence02:37

Gene Duplication and Divergence

The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
Homologous Recombination02:31

Homologous Recombination

The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...

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Related Experiment Video

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Engineering and Evolution of Synthetic Adeno-Associated Virus AAV Gene Therapy Vectors via DNA Family Shuffling
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Pool-packaged AAV libraries exhibit extensive length-dependent and homology-dependent chimerism.

Jean-Benoît Lalanne1,2, Chau Huynh3,4, John K Mich5

  • 1Department of Genome Sciences, University of Washington, Seattle, WA, USA. jean-benoit.lalanne@umontreal.ca.

Nature Biotechnology
|April 28, 2026
PubMed
Summary

Extensive chimerism, or barcode swapping, occurs in pooled recombinant adeno-associated virus (AAV) libraries. This phenomenon, dependent on length and homology, impacts the design of gene therapy vectors.

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Area of Science:

  • Molecular Biology
  • Gene Therapy
  • Virology

Background:

  • Adeno-associated viruses (AAVs) are widely used as gene therapy vectors due to their favorable characteristics.
  • Developing complex recombinant AAV (rAAV) libraries is crucial for advancing gene therapy applications.
  • Understanding the behavior of rAAV libraries during packaging is essential for optimizing vector design.

Purpose of the Study:

  • To investigate the phenomenon of chimerism in pooled rAAV libraries.
  • To determine the factors influencing chimerism, such as length, homology, and capsid.
  • To assess the implications of chimerism on the design and use of functional rAAV libraries.

Main Methods:

  • Construction and pooling of complex rAAV libraries.
  • Analysis of packaged rAAV genomes to detect barcode swapping (chimerism).
  • Correlation analysis to identify dependencies of chimerism on genome length, homology, and capsid type.

Main Results:

  • Demonstration of extensive chimerism, characterized by pervasive barcode swapping, in pooled rAAV libraries.
  • Chimerism was found to be dependent on rAAV genome length and homology.
  • Capsid type did not significantly influence the observed chimerism.
  • In some instances, chimerism affected the majority of packaged rAAV genomes.

Conclusions:

  • Chimerism is a significant factor in pooled rAAV library packaging.
  • The length and homology dependence of chimerism necessitates careful library design.
  • These findings have critical implications for the development and application of functional rAAV gene therapy vectors.