Natural Transformation Mechanisms in Bacterial Systems
Summary
Natural transformation is a form of horizontal gene transfer by which bacteria internalise free DNA from their surroundings and integrate it into their genomes through homologous recombination. This process is central to bacterial evolution, driving the acquisition of novel traits such as antibiotic resistance, metabolic pathways and virulence factors. Competence, the physiological state that permits DNA uptake, is regulated by complex networks of transcriptional regulators, two-component systems and quorum-sensing pathways. Transformation begins with assembly of a specialised DNA uptake machinery, often resembling a type IV pilus, which binds extracellular DNA and translocates it across the cell envelope. In Gram-negative bacteria DNA traverses the outer membrane, periplasm and inner membrane, whereas Gram-positive species employ peptidoglycan-spanning complexes. Key proteins such as ComGC pilin and the periplasmic receptor ComEA mediate DNA binding and channeling towards recombination proteins. Integration of exogenous DNA requires a carefully coordinated interplay between nucleases, transport ATPases and recombinases. Insights into the structural and regulatory mechanisms underpinning transformation have practical applications in microbial genetics, biotechnology and the containment of antimicrobial resistance. Continued elucidation of natural transformation pathways promises to deepen our understanding of microbial adaptation and inform novel strategies to combat the spread of undesirable genetic traits.
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Natural Transformation Mechanisms in Bacterial Systems publication trend
The graph below shows the total number of articles in natural transformation mechanisms in bacterial systems across all publications each year (not limited to Nature Index journals).
Technical terms
Competence: A transient physiological state in which bacteria express DNA uptake machinery and regulatory proteins to internalise exogenous DNA.
Natural transformation: A process of horizontal gene transfer involving uptake of free DNA from the environment and its integration into the recipient genome.
Type IV pilus: A filamentous extracellular appendage that mediates binding and translocation of DNA across the bacterial cell envelope.
ComEA: A periplasmic DNA-binding protein that captures incoming DNA and directs it towards transport machinery in Gram-negative bacteria.
ComGC: The major pilin subunit that polymerises to form the competence pilus in many Gram-positive species.
Homologous recombination: A process by which genetic material is exchanged between two similar or identical DNA molecules, enabling integration of imported DNA.
References
- Uptake of environmental DNA in Bacillus subtilis occurs all over the cell surface through a dynamic pilus structure. PLOS Genetics (2023).
- Transcriptional regulation of TacL-mediated lipoteichoic acids biosynthesis by ComE during competence impacts pneumococcal transformation. Frontiers in Cellular and Infection Microbiology (2024).
- Multisite transformation in Neisseria gonorrhoeae: insights on transformations mechanisms and new genetic modification protocols. Frontiers in Microbiology (2023).
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