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Gene Duplication and Divergence

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.

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.

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

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.

Evolutionary Relationships through Genome Comparisons

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...

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 has three reading...

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Updated: May 31, 2026

Comparative RNA Structure Analysis of Nascent and Mature Transcripts in Saccharomyces cerevisiae

Comparative RNA Structure Analysis of Nascent and Mature Transcripts in Saccharomyces cerevisiae

Published on: February 27, 2026

Parallel evolution of transcriptome architecture during genome reorganization.

Sung Ho Yoon¹, David J Reiss, J Christopher Bare

¹Institute for Systems Biology, Seattle, Washington 98109, USA.

Genome Research

|July 14, 2011

Summary

This summary is machine-generated.

Microbial operon evolution shows a phylogenetic trend in archaea. Genome instability impacts operon stability, with higher temperatures correlating to less tolerance for operon disruption.

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Published on: May 9, 2017

Area of Science:

Microbiology
Genomics
Evolutionary Biology

Background:

Gene operons are crucial for microbial adaptation to environmental changes.
Genome reorganization events, while driving operon formation, can also destabilize existing operons.
Understanding operon stability across diverse microbial lineages is key to deciphering evolutionary strategies.

Purpose of the Study:

To investigate the correlation between phylogenetic lineage and the proportion of genes in operons in archaea.
To compare the transcriptome architectures of four diverse extremophilic archaea to understand mechanisms of operon instability.
To elucidate how transcriptional elements evolve to manage operon stability and gene regulation.

Main Methods:

Statistical analysis of gene organization across archaeal lineages.
Comparative transcriptome architecture mapping of four extremophilic archaea: Halobacterium salinarum NRC-1, Methanococcus maripaludis S2, Sulfolobus solfataricus P2, and Pyrococcus furiosus DSM 3638.
Analysis of promoter and terminator element evolution within operons.

Main Results:

A statistically significant trend was found correlating the proportion of genes in operons to phylogenetic lineage in archaea.
Operon instability is managed through the evolution of transcriptional elements, which can create new operons or restore regulation.
An inverse correlation (r=-0.92) exists between internally located transcriptional elements and operon conservation across the studied archaea.
Organisms thriving at higher temperatures exhibit reduced tolerance for genome reorganization events that disrupt operon structures.

Conclusions:

The proportion of genes organized into operons is phylogenetically constrained in archaea.
Transcriptional element evolution is a dynamic process that shapes operon architecture and regulation across archaeal lineages.
Higher growth temperatures impose constraints on genome plasticity, impacting operon stability and evolutionary adaptability.