Microbial Genome Evolution
Microbial Genome Evolution - Related Videos
01:08
Evolution of Microbial Genome
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2026
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.
03:42
Adaptive Evolution of Bacteria Using a Microbial Microdroplet Culture System
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2025
Source: Jian, X., et al., Automated Microbial Cultivation and Adaptive Evolution using Microbial Microdroplet Culture System (MMC). J. Vis. Exp. (2022).This video demonstrates the use of a microbial microdroplet culture system to drive adaptive evolution of bacteria toward methanol tolerance. By mixing engineered bacterial cultures with a high-methanol stress medium and segmenting them into microdroplets, the system selects for mutants that exhibit improved growth under methanol stress. Through...
03:21
Genome Size and the Evolution of New Genes
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2020
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.
03:21
Genome Size and the Evolution of New Genes
0 Views •
2023
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.
08:18
Automated Microbial Cultivation and Adaptive Evolution using Microbial Microdroplet Culture System (MMC)
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Cited by 1 •
2022
This protocol describes how to use the Microbial Microdroplet Culture system (MMC) to conduct automated microbial cultivation and adaptive evolution. MMC can cultivate and sub-cultivate microorganisms automatically and continuously and monitor online their growth with relatively high throughput and good parallelization, reducing labor and reagent consumption.
FAQs
Mutations create changes in microbial DNA, while recombination can rearrange existing genetic material into new combinations. These changes may affect genes or genome organization, producing variation on which evolutionary processes act. When a resulting trait improves survival or reproduction in a particular environment, it may become more common, contributing to adaptation and increasing diversity among microbial populations.
Horizontal gene transfer allows genetic material to move between microbes rather than passing only from parent cells to offspring. Mobile genetic elements can contribute to this movement and alter genome organization. These processes may spread genes affecting antibiotic resistance, metabolism, or host adaptation, allowing related or even ecologically distinct microbes to acquire useful traits relatively quickly.
Natural selection favors inherited changes associated with improved performance under specific conditions, so advantageous traits can increase in frequency. Genetic drift changes trait frequencies through chance, particularly within populations where random effects are influential. Considering both processes helps explain why microbial populations may diverge, retain different genetic features, or show contrasting adaptations in different environments.
Gene loss can remove functions that are unnecessary in a particular environment, whereas duplication can provide additional genetic copies that may support functional change. Recombination and other alterations to genome organization can create new genetic arrangements. Together, these processes reshape metabolic capacity, ecological function, and the traits available for selection during microbial evolution.
Comparative genomics examines genetic similarities and differences among microbial genomes to identify changes associated with adaptation, diversity, or ecological function. Researchers can compare gene content and genome organization across populations or related organisms, then use those patterns to investigate gene loss, duplication, recombination, and other evolutionary changes. The approach also helps identify genes of biological or applied importance.
Phylogenetic analysis uses patterns of genetic similarity and difference to reconstruct evolutionary relationships among microbes. These relationships provide context for interpreting when populations diverged and how particular genetic changes may have spread or persisted. In biology and medicine, the resulting evolutionary framework supports investigation of microbial diversity, emerging pathogens, and the distribution of important traits.
Tracking genome changes can reveal how antibiotic resistance and other medically important traits arise or spread among microbial populations. The same evolutionary perspective helps researchers examine host adaptation and the organization of microbial communities. In environmental and biotechnology research, genome comparisons can also identify genes linked to ecological functions or properties with potential practical value.