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Exon Recombination

Exon Recombination

The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon...

Genome Size and the Evolution of New Genes

Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.

Genome Size and the Evolution of New Genes

Genome Size and the Evolution of New Genes

Gene Conversion

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...

Evolution of Microbial Genome

Evolution of Microbial Genome

Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.

Evolutionary Processes in Microbes

Evolutionary Processes in Microbes

Microbial evolution occurs rapidly due to short generation times and a variety of genetic processes, including horizontal gene transfer, mutation, recombination, and genetic drift. These mechanisms collectively enable microbes to adapt swiftly to changing environments.Horizontal gene transfer (HGT) allows genes to move between different species and occurs through three main mechanisms: conjugation, transformation, and transduction. Conjugation involves direct cell-to-cell contact for DNA...

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Related Experiment Video

Updated: May 2, 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

Evolutionary engineering by genome shuffling.

Damien Biot-Pelletier¹, Vincent J J Martin

¹Department of Biology, Concordia University, 7141 Sherbrooke West, Montréal, Québec, H4B 1R6, Canada.

Applied Microbiology and Biotechnology

|March 6, 2014

Summary

This summary is machine-generated.

Genome shuffling enables directed evolution of microorganisms for enhanced industrial applications. This technique uses recursive recombination to improve complex traits in microbes like those producing antibiotics and biofuels.

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Directed Evolution Method in Saccharomyces cerevisiae: Mutant Library Creation and Screening

Directed Evolution Method in Saccharomyces cerevisiae: Mutant Library Creation and Screening

Published on: April 1, 2016

Area of Science:

Microbial Engineering
Synthetic Biology
Biotechnology

Background:

The growing bioeconomy necessitates engineering microorganisms with advanced capabilities.
Industrial microbial productivity relies on developing superior strains.
Traditional methods for strain improvement are time-consuming and limited.

Purpose of the Study:

To review the technical aspects of genome shuffling as a method for microbial strain improvement.
To explore the diversity of organisms, phenotypes, and methodologies used in genome shuffling.
To discuss the potential of genome shuffling for understanding complex phenotypes.

Main Methods:

Genome shuffling involves directed evolution through recursive recombination at the genome level.
Review of literature on organisms, phenotypes, genetic diversity sources, and recombination techniques.
Analysis of current practices and prospective methods for diversity generation and recombination.

Main Results:

Genome shuffling has been applied to prokaryotic and eukaryotic microorganisms, particularly for antibiotic and biofuel production.
Mutagenesis is the primary source of genetic diversity, while protoplast fusion and sexual recombination are common recombination methods.
Few studies utilize alternative strategies for diversity and recombination, and prospective methods remain underexplored.

Conclusions:

Genome shuffling offers a powerful approach for directed evolution of microorganisms.
Current applications are concentrated in specific microbial industries, with potential for broader use.
Further exploration of novel diversity and recombination methods can enhance genome shuffling's efficacy and applications.