Related Experiment Video
Updated: Jun 28, 2026
08:03
Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations
Published on: December 7, 2021
Genomics and evolution of heritable bacterial symbionts
Nancy A Moran1, John P McCutcheon, Atsushi Nakabachi
1Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona 85721, USA. nmoran@email.arizona.edu
Annual Review of Genetics
|November 6, 2008
Summary
Insect heritable symbionts are widespread and play diverse roles, from nutrient provisioning to reproductive manipulation. Their study reveals insights into host speciation and genetic transfer, pushing evolutionary boundaries.
Area of Science:
- Microbiology
- Evolutionary Biology
- Genomics
Background:
- Insect heritable symbionts are ubiquitous across diverse insect lineages.
- Recent advances have significantly deepened our understanding of their biological roles.
- Previously distinct symbiont categories are now recognized as interconnected.
Purpose of the Study:
- To synthesize current knowledge on insect heritable symbionts.
- To highlight their diverse biological functions and evolutionary impacts.
- To explore the implications for host speciation and genetic transfer.
Main Methods:
- Molecular screening of insect lineages.
- Experimental approaches to elucidate symbiont functions.
- Comparative genomics of symbiont genomes.
Main Results:
- Symbionts exhibit a spectrum of interactions, including mutualism and reproductive manipulation (e.g., Wolbachia).
- Heritable symbiosis can drive host speciation through reproductive and ecological isolation.
- Symbionts facilitate genetic information transfer between host lineages.
- Insect symbionts display extreme genomic characteristics, including the smallest and fastest-evolving genomes.
Conclusions:
- Insect heritable symbionts are crucial drivers of host evolution and diversification.
- The study of symbionts challenges our understanding of genomic evolution.
- Further research is needed to explore the full scope of symbiont-host interactions and their evolutionary consequences.
Related Concept Videos
01:08Evolution 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.
01:24Evolution of New Traits in Microbes
Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
01:26Evolutionary 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...
00:46Genomic DNA in Prokaryotes
The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
Genomic Diversity in Bacteria
Although bacterial genomes are much...
Genomic Diversity in Bacteria
Although bacterial genomes are much...
03:21Genome 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.
03:21Genome 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.