Related Experiment Video
Updated: Jul 1, 2026
08:03
Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations
Published on: December 7, 2021
Evolution, population structure, and phylogeography of genetically monomorphic bacterial pathogens
1Environmental Research Institute, University College Cork, Cork, Ireland. m.achtman@ucc.i.e
Annual Review of Microbiology
|September 13, 2008
Summary
Genetically monomorphic bacteria pose sequencing challenges due to low diversity. Genomic analysis, particularly single nucleotide polymorphisms, offers new insights into their evolution and impact on human history.
Area of Science:
- Microbiology
- Evolutionary Biology
- Genetics
Background:
- Genetically monomorphic bacteria exhibit minimal sequence diversity, complicating traditional genetic analysis.
- Understanding the evolution of these bacteria is crucial, as many are significant human pathogens.
Purpose of the Study:
- To explore advanced genomic methods for analyzing genetically monomorphic bacteria.
- To investigate the evolutionary and phylogeographic patterns of these microbes.
Main Methods:
- Genomic-level analyses to identify genetic variation.
- Focus on single nucleotide polymorphisms (SNPs) as a key tool.
Main Results:
- Single nucleotide polymorphisms (SNPs) are identified as a promising approach for studying bacterial evolution.
- Genomic analysis overcomes limitations of traditional sequencing for low-diversity bacteria.
Conclusions:
- Genomic approaches, especially SNP analysis, are vital for understanding the evolution of genetically monomorphic bacteria.
- This research aids in comprehending the historical impact of infectious diseases caused by these pathogens.
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.
01:26Evolutionary 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...
01:29Modern Molecular Taxonomy
Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
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...
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...
01:29Microbial Morphologies
Bacterial and archaeal cells exhibit remarkable diversity in shape and structure, critical in their adaptability and functionality. Among bacteria, the most commonly observed shapes include cocci and bacilli. Cocci are spherical and may exist singly or in groupings such as pairs (diplococci), chains (streptococci), clusters (staphylococci), or tetrads. Bacilli, in contrast, are rod-shaped and can also occur as single cells, in pairs, or chains, depending on their environmental and genetic...