Overview of Homologous Recombination-Mediated Phage Genome Engineering
Homologous recombination-mediated phage genome engineering is a practical approach for
introducing defined genetic changes into bacteriophage genomes through recombination between
homologous DNA sequences in a bacterial host. For many phage engineering studies, this
remains a useful route when the editing strategy is built around host-based manipulation
rather than full ex vivo genome assembly.
Creative Biolabs supports research-use projects involving phage genome modification, with
project planning tailored to the phage system, host background, and intended engineering
objective. Our services are designed for pharma and biotech R&D teams, academic
laboratories, research institutes, and other research-focused organizations seeking
technically grounded support for phage engineering studies.
When Homologous Recombination Is Used in Phage Engineering
Homologous recombination is particularly relevant when a project requires targeted
modification of an existing phage genome through a host-based workflow. In a typical allelic
exchange strategy, the edited DNA is first incorporated into a plasmid or related donor
construct and introduced into the bacterial host. The host is then infected with the
parental phage so that recombination can occur between the phage genome and the homologous
donor sequence.
In practice, suitability depends on several factors, including phage biology, host
compatibility, edit type, and the feasibility of recovering and confirming recombinant
phages. Homologous recombination remains a foundational route in phage genome engineering,
but successful application depends on careful workflow design and a realistic strategy for
mutant recovery and verification.
Considerations for Temperate and Virulent Phages
Project design should take phage type into account from the beginning. Virulent
phages can present additional practical challenges for cloning and direct
manipulation, which makes host-based engineering routes especially relevant in some
cases. More broadly, the choice of workflow may vary with genome accessibility, host
range, and the ability to enrich or identify the desired recombinant phage.
For that reason, an effective engineering plan usually begins with a careful review
of the phage-host system, the intended genetic change, and the downstream
confirmation strategy.
What We Can Support
Creative Biolabs supports homologous recombination-mediated phage engineering projects from
early design planning through recombinant phage recovery and basic downstream evaluation.
Depending on project scope, it may also connect with related activities such as synthetic
phage genome design, genome assembly, phage genome rescue, and preliminary functional
evaluation. These elements are incorporated when they are scientifically appropriate for the
project rather than treated as fixed components of every study. The exact workflow depends
on the scientific objective and the feasibility of the selected host-phage system.
Targeted Sequence Modification
Defined edits may include sequence replacement, regional
deletion, element insertion, or other planned modifications based on
homologous donor sequences, with scope evaluated according to phage biology
and project goals.
Donor Design and Editing Strategy
We support donor design, homologous region planning, and
editing strategy development for host-based recombination workflows, with
optional genome design and assembly support where broader engineering is
required.
Recombinant Phage Recovery and Screening
Recombinant phage recovery and screening are built into
project planning to help distinguish engineered phages from parental
populations and support a technically reliable downstream workflow.
Optional Downstream Characterization
Where appropriate, preliminary characterization may include
one-step growth analysis and inhibition curve assays to support early
evaluation of engineered phages after recovery.
As a leading partner in phage research, Creative Biolabs provides a comprehensive, highly efficient homologous recombination-mediated phage engineering service. Our expertly optimized, end-to-end workflow guarantees precise gene knockouts, insertions, or point mutations, empowering your phage display library developments.
Phase I
Donor Plasmid Design & Construction
Our dedicated scientists initiate the project by designing custom homology arms tailored precisely to your target genomic locus. We seamlessly clone your desired editing sequence—whether an antibody fragment, regulatory element, or mutation—into a specialized donor vector, ensuring high stability and robust replication in the selected host system.
Phase II
Host Transformation & Phage Infection
The rigorously validated donor plasmid is introduced into an optimized bacterial host strain. Following successful transformation, wild-type phages are introduced into the culture. We meticulously calibrate the multiplicity of infection (MOI) and growth conditions to maximize the physiological interaction between the host and the replicating phage.
Phase III
In Vivo Recombination Execution
Within the dynamic environment of the host system, our protocols leverage endogenous bacterial RecA networks or highly efficient phage-encoded recombinases (e.g., Red/ET systems). This orchestrates the precise double-crossover events, seamlessly substituting the native phage DNA with the engineered sequence from the donor plasmid.
Phase IV
Advanced Screening & Enrichment
Recognizing that baseline homologous recombination efficiency can be low, Creative Biolabs integrates cutting-edge counter-selection strategies. By employing sequence-guided nuclease-based counter-selection systems to specifically target and cleave unedited wild-type genomes, or by utilizing sophisticated phenotypic marker screenings, we robustly enrich for the desired recombinant phages, driving the success rate toward 100%.
Phase V
Purification & Sequence Verification
The enriched phage pool is plated to isolate definitive single plaques. We then meticulously extract the modified phage genome and perform comprehensive quality control, including PCR amplification and Sanger sequencing. This rigorous validation ensures that your engineered phage is genetically perfect, off-target-free, and fully prepared for downstream functional applications.
It is helpful to define the intended edit as clearly as possible, including the
type of modification, the reason for the change, and any planned downstream
analysis. A focused objective makes it easier to evaluate technical fit and
identify an appropriate workflow.
Deliverables
Design and Technical Documentation
Technical discussion and project planning related to the selected
engineering route
Design support for edited DNA or synthetic genome segments, where included
Workflow recommendations aligned with the phage-host system
Recombinant Phage Screening and Confirmation Results
Recombinant phage recovery and screening outputs, where included
Confirmation data for the engineered phage genome, where included in scope
Preliminary Characterization Data
One-step growth data
Inhibition curve data
Other agreed basic characterization readouts, where applicable
Why Work with Creative Biolabs
Project-Centered Planning
We design each study around phage biology, host
compatibility, edit complexity, and downstream research goals to support a more
suitable engineering workflow.
Broad Engineering Capability
In addition to homologous recombination, we can support
related strategies such as recombineering, programmable nuclease-assisted editing, and genome
assembly when project needs require.
End-to-End Technical Support
Our services can cover project design, genome engineering,
recombinant phage recovery, and preliminary characterization to help maintain a
clear and consistent workflow.
Scientifically Grounded Execution
We keep project scope aligned with technical feasibility
and research objectives, helping clients move forward with a practical and
well-defined engineering strategy.
Discuss Your Project
Phage genome engineering projects often benefit from an early technical discussion,
especially when the edit strategy, host context, or recombinant recovery route still
needs to be refined. We welcome project inquiries for research-use applications.
What to Include in Your Inquiry
To help us review your project efficiently, please consider including:
phage type or strain information
host strain information
desired engineering objective
available sequence information
any preferred downstream analysis or characterization needs
Discuss Your Project
Related Genome Engineering Services
Creative Biolabs also offers additional bacteriophage genome engineering services to support
different modification strategies and project needs.
Offers an alternative route for phage genome assembly or rebooting in
suitable workflows.
FAQs
Q: Can Homologous Recombination-Mediated Editing Be
Used for All Phages?
A: Not necessarily.
Suitability depends on the phage, the host system, the nature of the intended edit,
and the practicality of recovering and confirming recombinant phages. Some projects
are better served by alternative engineering strategies or by a combined workflow.
Q: What Information Is Needed to Assess Project Feasibility?
A: A productive feasibility
review usually begins with phage identity, host information, available genome
sequence or target-region information, the desired edit, and any planned downstream
assays. The more clearly the engineering objective is defined, the easier it is to
evaluate workflow options.
Q: How Are Recombinant Phages Identified and Confirmed?
A: The exact approach depends
on project design, but recombinant recovery and confirmation are typically treated
as dedicated parts of the workflow rather than incidental follow-up steps. Screening
and confirmation strategy should be considered early in project planning because
they often influence the overall robustness of the study.
Q: Can This Service Be Combined with Other Phage Engineering
Approaches?
A: Yes. Depending on the
project, homologous recombination-mediated editing may be combined with related
support modules such as synthetic genome design, genome assembly, rescue, or
downstream characterization. Whether these elements are needed depends on the
scientific objective and the selected engineering route.
Q: What Types of Genetic Changes Can Be Considered in This Service?
A: Depending on project
design, homologous recombination-mediated engineering may be used for defined
sequence replacement, insertion, deletion, or other planned modifications built
around homologous donor sequences.
Q: Is Donor DNA Design Part of the Service?
A: Yes. Donor design can be
incorporated into project planning, including evaluation of the edited fragment,
homologous regions, and the overall strategy needed to support recombinant recovery.
Q: Can This Service Support Virulent Phage Engineering?
A: In some cases, yes.
Virulent phages can present additional technical challenges, so workflow design
should be evaluated carefully in the context of the host system and the intended
modification.
Q: Are Synthetic Genome Design or Assembly Services Available for
Related Projects?
A: Yes. For projects that
extend beyond local sequence modification, related support may be discussed for
synthetic genome design, sequence assembly, or broader genome construction
workflows.
Q: Is This Service Suitable for Early-Stage Research Projects?
A: Yes. This service can
support exploratory research, method development, and targeted engineering studies
where the goal is to evaluate a defined phage modification strategy in a research
setting.
Q: Does Project Design Depend on the Phage-Host System?
A: Yes. The phage-host
background is an important factor in workflow planning because it can influence
editing strategy, recombinant recovery, and downstream study design.
Reference:
Dedrick,
Rebekah M., Carlos A. Guerrero-Bustamante, Rebecca A. Garlena, Daniella A. Russell,
Katelyn Ford, Kathleen Harris, Deborah C. Gilmour, et al. “CRISPY-BRED and CRISPY-BRIP:
Efficient Bacteriophage Engineering.” Scientific Reports 11 (2021): 6796. Distributed under Open Access license CC BY 4.0, without modification. https://doi.org/10.1038/s41598-021-86112-6.
Please kindly note that our services can only be used to support research purposes (Not for clinical use).
Creative Biolabs is a globally recognized phage company. Creative Biolabs is committed to providing researchers with the most reliable service and the most competitive price.
