GO:0098038 non-replicative DNA transposition: Cut-and-Paste Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0098038 non-replicative DNA transposition is a biological process in which a transposable element is excised from a donor site and integrated at a target site without replication of the element, also known as cut-and-paste transposition.
• The process is mechanistically distinct from replicative transposition, which duplicates the element; non-replicative transposition moves the element without increasing copy number.
• Key molecular players include transposases such as Tn10 transposase, Tn916 transposase, and Mu transposase, which form transpososomes and catalyze DNA cleavage and strand transfer.
• Non-replicative transposition is regulated by transpososome dynamics, host factors such as DNA gyrase and Hup, and the availability of target DNA.
• Rates of transposition in Escherichia coli have been measured, showing that non-replicative events occur at low frequencies and are influenced by host factors.
• Understanding non-replicative DNA transposition informs genome engineering, antibiotic resistance spread, and the development of transposon-based tools.
Description
Non-replicative DNA transposition, annotated as GO:0098038, is a biological process in which a transposable element is excised from a donor site and integrated at a target site without replication of the element. This mechanism is often referred to as cut-and-paste transposition because the element is physically moved rather than copied. It is a fundamental process in bacterial genetics and genome plasticity, contributing to the spread of antibiotic resistance genes and the reorganization of genomes. The process is mediated by transposases that recognize the ends of the element, form a transpososome complex, and catalyze DNA cleavage and strand transfer. Unlike replicative transposition, which duplicates the element and increases copy number, non-replicative transposition conserves the number of element copies. This distinction is critical for understanding how transposons shape genome evolution and how they can be harnessed for genetic engineering. Researchers study non-replicative transposition to dissect the molecular steps of DNA recombination, to quantify transposition rates, and to develop transposon-based tools for genome modification. The process is also relevant to the dissemination of virulence and resistance determinants in bacterial populations. In this article, we synthesize authoritative QuickGO annotation and verified PubMed literature to provide a research-grade overview of GO:0098038, covering its definition, mechanism, key genes, regulation, disease relevance, and experimental methods.
non-replicative DNA transposition At A Glance
| GO ID | GO:0098038 |
|---|---|
| GO term | non-replicative DNA transposition |
| Ontology | biological_process |
| Synonym | cut-and-paste transposition, non-replicative transposition, DNA-mediated |
| Definition | Process by which a transposable element is excised from the donor site and integrated at the target site without replication of the element. |
| Major function | Mobilization of transposable elements without duplication, contributing to genome plasticity and horizontal gene transfer. |
| Key enzymes | Transposases such as Tn10 transposase, Tn916 transposase, and Mu transposase. |
| Host factors | DNA gyrase, Hup, and other nucleoid-associated proteins. |
| Related process | Replicative transposition, which duplicates the element. |
What Is GO:0098038?
GO:0098038 non-replicative DNA transposition is defined as the process by which a transposable element is excised from the donor site and integrated at the target site without replication of the element. This is also known as cut-and-paste transposition, non-replicative transposition, or DNA-mediated transposition. In this process, the transposable element is not duplicated; instead, it is physically moved from one genomic location to another. The reaction is catalyzed by a transposase enzyme that binds to the ends of the element, assembles into a transpososome, and performs DNA cleavage and strand transfer. The process is distinct from replicative transposition, which involves duplication of the element and often requires host replication machinery. Non-replicative transposition is a conservative event that can lead to excision of the element from the donor site and insertion at a new target site, potentially disrupting genes at the insertion site.
Why Is non-replicative DNA transposition Important in Cell Biology?
Non-replicative DNA transposition is important because it is a major driver of genome evolution and the spread of antibiotic resistance and virulence genes in bacteria. The process enables transposable elements to move within and between genomes without increasing copy number, which can cause insertional mutations and genomic rearrangements. Understanding the mechanism of non-replicative transposition is essential for developing transposon-based genetic tools and for predicting the mobility of resistance determinants. In addition, the process serves as a model for studying DNA recombination and transpososome dynamics, providing insights into fundamental aspects of DNA-protein interactions.
• Non-replicative transposition mediates the movement of transposable elements without duplication, affecting genome stability.
• It contributes to the spread of antibiotic resistance genes among bacterial populations.
• The process is a model for studying DNA recombination and transpososome assembly.
• It is distinct from replicative transposition, which requires element duplication.
• Host factors such as DNA gyrase and Hup modulate the efficiency of non-replicative transposition.
• Transposon-based tools derived from non-replicative elements are used for genome engineering.
• Rates of transposition can be measured experimentally, providing quantitative insights into mobility.
• The process is relevant to the dissemination of virulence factors in pathogens.
• Understanding non-replicative transposition aids in predicting insertional mutagenesis outcomes.
• It provides a basis for developing novel antimicrobial strategies targeting transposition.
What Happens During non-replicative DNA transposition?
Transpososome Assembly and Synapsis
In simple terms: The transposase enzyme binds to both ends of the transposon and brings them together.
The first step in non-replicative DNA transposition is the assembly of a transpososome, a nucleoprotein complex in which the transposase binds to the terminal inverted repeats at both ends of the transposable element. This assembly brings the two ends into close proximity, a process called synapsis, which is essential for subsequent cleavage and strand transfer. In Tn10 transposition, the transpososome undergoes dynamic conformational changes that regulate the chemical steps of the reaction. The formation of the transpososome is a key regulatory checkpoint and is influenced by host factors such as DNA gyrase and Hup.
DNA Cleavage at the Donor Site
In simple terms: The transposase cuts the DNA at both ends of the transposon, freeing it from the donor site.
After synapsis, the transposase catalyzes the cleavage of the DNA strands at the ends of the transposable element, typically via a hairpin intermediate or direct hydrolysis. This cleavage excises the element from the donor site, generating a free transposon with reactive 3'-OH ends. In Tn10 transposition, the cleavage step is tightly regulated by the transpososome conformation and metal ions. The excision is a non-replicative event, meaning the element is not duplicated during this process.
Strand Transfer and Integration at the Target Site
In simple terms: The excised transposon is inserted into a new location in the DNA.
The excised transposon is then integrated into a target DNA site through a strand transfer reaction catalyzed by the transposase. The 3'-OH ends of the transposon attack the target DNA, leading to covalent joining of the transposon to the target. This step is often accompanied by target site duplication, but the element itself is not replicated. In Tn10 transposition, the strand transfer step is regulated by the transpososome and can be influenced by the target DNA sequence and host factors.
Resolution and Repair
In simple terms: The cell repairs the DNA gaps left behind after the transposon moves.
After strand transfer, the transposon is flanked by gaps that must be repaired by host DNA repair machinery. The donor site, which has lost the transposon, may also require repair. In non-replicative transposition, the donor site is not restored by replication, and the element is not duplicated. The repair process can influence the outcome of transposition and the stability of the insertion.
Host Factors and Regulation
In simple terms: Helper proteins in the cell control how often and where the transposon moves.
Host factors such as DNA gyrase and Hup play important roles in non-replicative transposition. DNA gyrase requirements distinguish alternate pathways of Mu transposition, and Hup participates in replicative transposition of Mu phage. These factors influence the efficiency and target site selection of transposition. In addition, the transpososome dynamics and regulatory proteins control the timing and frequency of the reaction.
Key Genes Involved in GO:0098038 non-replicative DNA transposition
The following genes and proteins are central to non-replicative DNA transposition, based on verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| Tn10 transposase | Catalyzes cut-and-paste transposition of Tn10 | Model for transpososome dynamics and regulation |
| Tn916 transposase | Mediates non-replicative transposition of Tn916 | Studied in Streptococcus mutans transformation |
| Mu transposase | Catalyzes Mu transposition, including non-replicative pathways | Distinguishes alternate pathways by DNA gyrase requirements |
| IS911 transposase | Mediates IS911 transpositional recombination | In vitro model for transposition |
| DNA gyrase | Host factor influencing Mu transposition pathways | Required for specific transposition pathways |
| Hup | Nucleoid-associated protein involved in Mu replicative transposition | Participates in Mu phage transposition |
| Integration host factor (IHF) | Host factor that may influence transpososome assembly | Potential regulator of transposition |
| Target DNA | Site of integration for the transposon | Determines insertion specificity |
| Donor DNA | Site from which the transposon is excised | Source of the transposable element |
| Transposon ends | Terminal inverted repeats recognized by transposase | Essential for transpososome formation |
| Host repair proteins | Repair gaps after strand transfer | Influence insertion stability |
| Mini-Mu unit | Recombinant transposon used in Corynebacterium glutamicum | Applied for genome engineering |
| Transposase accessory proteins | Modulate transposase activity | Potential targets for regulation |
| DNA polymerase | May fill gaps during repair | Host factor in transposition |
| Ligase | Seals nicks after repair | Host factor in transposition |
| Nucleases | Process DNA ends during transposition | Host factors |
| Recombination proteins | May assist in strand transfer | Host factors |
How Is non-replicative DNA transposition Regulated?
Non-replicative DNA transposition is regulated at multiple levels, including transpososome assembly, transposase activity, and host factor availability. The transpososome undergoes conformational changes that control the chemical steps of cleavage and strand transfer. Host factors such as DNA gyrase and Hup modulate the efficiency and pathway choice of transposition. In addition, the availability of target DNA and the nucleotide sequence at the target site can influence integration frequency. The process is also subject to regulation by cellular stress responses and DNA repair pathways, which can affect the outcome of transposition.
non-replicative DNA transposition and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| Tn916 transposase | Antibiotic resistance spread | Streptococcus mutans transformation assays |
| Mu transposase | Phage Mu transposition and genome plasticity | Escherichia coli transposition assays |
| Tn10 transposase | Insertional mutagenesis | In vitro transpososome assays |
| IS911 transposase | Transpositional recombination | In vitro recombination assays |
| Mini-Mu unit | Biotechnological genome engineering | Corynebacterium glutamicum chromosome integration |
Antibiotic Resistance Spread
Non-replicative DNA transposition contributes to the dissemination of antibiotic resistance genes among bacterial populations. Transposons such as Tn916 can move between genomes via cut-and-paste transposition, carrying resistance determinants. This process is a major concern for public health, as it facilitates the spread of multidrug resistance.
Insertional Mutagenesis and Cancer
In eukaryotic systems, non-replicative transposition can cause insertional mutations that may activate oncogenes or disrupt tumor suppressor genes. Although the cited literature focuses on bacterial systems, the mechanistic principles of cut-and-paste transposition are relevant to understanding genome instability.
Genome Engineering Applications
Non-replicative transposition is harnessed for genome engineering, including the development of transposon-based vectors for gene delivery and insertional mutagenesis screens. The mini-Mu unit has been used for transposition in Corynebacterium glutamicum, demonstrating biotechnological applications.
From non-replicative DNA transposition-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does knockout of a candidate transposase reduce non-replicative transposition? | CRISPR knockout in Escherichia coli or Streptococcus mutans |
| Does a point mutation in the transposase active site abolish cleavage? | CRISPR point mutation knock-in in the transposase gene |
| Can a tagged transposase be used to track transpososome assembly? | CRISPR knock-in of an epitope tag |
| Does overexpression of a host factor increase transposition frequency? | CRISPR overexpression of DNA gyrase or Hup |
| What is the rate of non-replicative transposition in vivo? | Quantitative transposition assays in Escherichia coli |
| Can a recombinant mini-Mu unit be used for genome integration? | Corynebacterium glutamicum chromosome integration |
How to Study the non-replicative DNA transposition Process
| Method | What It Measures | Typical Application |
|---|---|---|
| In vitro transposition assay | Cleavage and strand transfer activity | Mechanistic studies of transposases |
| Transposition rate measurement | Frequency of transposition events | Quantitative genetics in Escherichia coli |
| Transformation assay | Non-replicative transposition in vivo | Streptococcus mutans studies |
| DNA gyrase inhibition | Pathway distinction in Mu transposition | Escherichia coli assays |
| Mini-Mu integration | Chromosomal integration efficiency | Corynebacterium glutamicum engineering |
| Transpososome assembly assay | Protein-DNA complex formation | Tn10 transposition studies |
| Hup mutant analysis | Role of host factors in transposition | Mu phage transposition |
| In vitro recombination | IS911 transpositional recombination | Mechanistic studies |
In Vitro Transposition Assays
In vitro transposition assays using purified transposase and DNA substrates are used to dissect the molecular steps of non-replicative transposition. These assays allow precise control of reaction conditions and can measure cleavage, strand transfer, and target site selection. IS911-mediated transpositional recombination has been studied in vitro.
Genetic Screens and Transposition Rate Measurements
Genetic screens in Escherichia coli and other bacteria are used to identify host factors and measure transposition rates. Rates of transposition in Escherichia coli have been quantified, providing baseline data for non-replicative events. DNA gyrase requirements distinguish alternate pathways of Mu transposition.
Transformation Assays with Non-Replicative Plasmids
Transformation of naturally competent Streptococcus mutans with non-replicative Tn916-containing plasmids has been used to study the mechanism of transposition. This approach allows the detection of transposition events in vivo.
Genome Engineering with Mini-Mu Units
Mu-driven transposition of recombinant mini-Mu unit DNA in the Corynebacterium glutamicum chromosome demonstrates the application of non-replicative transposition for genome engineering. This method can be used to integrate heterologous DNA into bacterial chromosomes.
How CRISPR Can Be Used to Study GO:0098038 non-replicative DNA transposition
Knockout
CRISPR knockout can be used to delete candidate transposase genes or host factor genes to assess their requirement for non-replicative DNA transposition. For example, knocking out DNA gyrase or Hup can reveal their roles in transposition pathways.
Point Mutation
CRISPR point mutation knock-in can introduce specific amino acid substitutions in transposase active sites to test catalytic residues and regulatory domains. This approach helps dissect the mechanism of cleavage and strand transfer.
Knock-in
CRISPR knock-in of epitope tags or fluorescent proteins into transposase genes allows tracking of transpososome assembly and localization in live cells. This can provide insights into the dynamics of non-replicative transposition.
Overexpression
CRISPR overexpression of transposases or host factors can increase the frequency of non-replicative transposition, facilitating the study of rare events and the development of transposon-based tools.
How EDITGENE Supports non-replicative DNA transposition Research
Researchers studying non-replicative DNA transposition-related genes often need to determine whether a candidate gene is causally involved in the process or is merely correlated with it. EDITGENE provides a comprehensive suite of CRISPR services to enable precise genetic perturbations and functional studies.
Contact EDITGENE today to design your custom CRISPR model for non-replicative DNA transposition research.
Frequently Asked Questions About non-replicative DNA transposition
What is non-replicative DNA transposition?
Non-replicative DNA transposition is a biological process (GO:0098038) in which a transposable element is excised from a donor site and integrated at a target site without replication of the element, also known as cut-and-paste transposition.
What genes are involved in non-replicative DNA transposition?
Key genes include transposases such as Tn10 transposase, Tn916 transposase, Mu transposase, and IS911 transposase, as well as host factors like DNA gyrase and Hup.
How does non-replicative transposition differ from replicative transposition?
Non-replicative transposition moves the element without duplicating it, whereas replicative transposition duplicates the element, increasing copy number.
What is the role of transposase in non-replicative DNA transposition?
Transposase binds to the ends of the transposon, forms a transpososome, and catalyzes DNA cleavage and strand transfer to move the element.
Which organisms use non-replicative DNA transposition?
Non-replicative transposition is found in bacteria such as Escherichia coli, Streptococcus mutans, and Corynebacterium glutamicum, and in phage Mu.
How is non-replicative DNA transposition regulated?
It is regulated by transpososome dynamics, host factors such as DNA gyrase and Hup, and target DNA availability.
What are the applications of non-replicative DNA transposition in biotechnology?
It is used for genome engineering, including mini-Mu-mediated integration in Corynebacterium glutamicum and transposon-based tools.
What methods are used to study non-replicative DNA transposition?
Methods include in vitro transposition assays, genetic screens, transformation assays, and transposition rate measurements.
Does non-replicative DNA transposition contribute to antibiotic resistance?
Yes, it can spread antibiotic resistance genes through the movement of transposons such as Tn916.
Can CRISPR be used to study non-replicative DNA transposition?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression can be used to dissect the roles of transposases and host factors.
Conclusion
Non-replicative DNA transposition (GO:0098038) is a fundamental biological process that enables the movement of transposable elements without duplication, contributing to genome plasticity and the spread of antibiotic resistance. The process is mediated by transposases and regulated by host factors, and it can be studied using a variety of genetic and biochemical methods. Understanding this process has important implications for genome engineering and public health. EDITGENE provides comprehensive CRISPR services to support research on non-replicative DNA transposition and related genes.
References
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- 3. Mit'kina LN. 2003. [Transposition as a way of existence: phage Mu].. Genetika 39(5):637-56 PMID: 12838611
- 4. Caufield PW et al.. 1995. Transformation of naturally competent Streptococcus mutans with replicative and non-replicative Tn916-containing plasmids: implications for a mechanism of transposition.. Dev Biol Stand 85:19-25 PMID: 8586174
- 5. Sousa A et al.. 2013. Rates of transposition in Escherichia coli.. Biol Lett 9(6):20130838 PMID: 24307531
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