CD Biosynsis offers specialized Vibrio natriegens Multi-Gene Knockout Strain Construction Services, enabling rapid and precise elimination of multiple competing genes in this ultra-fast-growing microbial host. V. natriegens is the ideal chassis for high-speed industrial biomanufacturing due to its rapid doubling time (approximately 10 min) and high flux capacity. Our services utilize advanced, multiplexed CRISPR-Cas9 strategies to achieve highly efficient, clean gene deletions (knockouts) across its dual-chromosome genome. Multi-gene knockouts are crucial for removing metabolic bottlenecks, eliminating undesirable byproduct formation, and redirecting carbon flux entirely towards the target compound. We provide integrated solutions from target rationalization and gRNA design to the final screening and verification of strains containing 2 to 10 simultaneous or sequential gene deletions.
Get a QuoteAchieving multiple sequential gene knockouts in traditional hosts is a time-consuming process. By leveraging the fast growth of V. natriegens and highly optimized multiplex CRISPR-Cas9 systems, we drastically compress the timeline for constructing complex chassis strains. Our methodology is designed for clean deletion of genes across both Chromosome I and Chromosome II. This ability to rapidly stack multiple beneficial genomic modifications is critical for achieving high-yield phenotypes necessary for industrial production, allowing for systematic metabolic pathway deconstruction and reassembly.
gRNA Cascade Design
Rational design of multiple guide RNAs (gRNAs) simultaneously targeting 2 to 10 genes, enabling single-step knockout of several pathways using one transformation.
Sequential vs. Simultaneous
Strategy optimization based on target lethality; performing simultaneous knockouts for non-essential genes or sequential editing for essential/toxic gene deletions.
Chromosomal Balance
Targeting genes across both Chromosome I and II to manage potential genomic instability and ensure balanced metabolic flux, critical for V. natriegens.
Cas9 and gRNA Expression
Use of robust, transiently expressed Cas9 systems and highly efficient polycistronic gRNA cassettes for multiplex cleavage across target loci.
Homology Repair Template
Design of short, efficient homology arms to promote accurate homologous recombination (HDR) and ensure clean deletion without introducing selectable markers.
Markerless Deletion
Implementation of counter-selection strategies or marker removal systems to ensure the final knockout strain is free of antibiotic resistance markers or unnecessary foreign DNA.
Byproduct Pathway Elimination
Deletions of key genes in pathways that divert carbon precursors away from the target product (e.g., lactate, acetate pathways).
Enhanced Substrate Utilization
Removal of regulatory genes or transporters to unlock the consumption of alternative, low-cost carbon sources or improve uptake kinetics.
Biosafety and Auxotrophy
Strategic deletion of nutrient synthesis genes (e.g., amino acid pathways) to establish auxotrophic strains, ensuring biological containment and safety.
A systematic process for construction, verification, and stabilization of multi-knockout strains.
1. Rational Target Selection
2. Multiplex System Construction
3. Transformation and Selection
4. Verification and Stabilization
Identify all native genes (2+) that need to be deleted based on metabolic modeling or experimental data.
Design gRNAs for each target locus and non-coding homology repair templates for clean deletion.
Determine the optimal strategy: single-step multiplexing or sequential editing.
Assemble the polycistronic gRNA expression cassette and Cas9 delivery vector.
Clone the repair template(s) into the appropriate delivery vehicle (if applicable) for homologous recombination (HDR).
Verify the integrity of the constructed multi-gene editing plasmids.
Genotype verification via multiplex PCR or Sanger sequencing of all target loci to confirm clean deletions.
Validate the resulting phenotype (e.g., loss of byproduct formation or auxotrophy).
Deliver the verified, markerless V. natriegens multi-knockout strain.
Accelerated Timeline
The use of multiplex CRISPR and the host's 10-minute doubling time allows the construction and verification of complex multi-gene knockout strains in a fraction of the time required by traditional hosts.
High Multiplexing Efficiency
Optimized CRISPR systems achieve high editing rates, facilitating the simultaneous deletion of multiple genes in a single transformation step, minimizing successive rounds of editing.
Clean and Markerless
Our protocols ensure the final strains are markerless, containing only the desired deletions without antibiotic resistance cassettes, maintaining strain integrity for industrial use.
Dual-Chromosome Expertise
Specialized knowledge to successfully design and execute knockouts across both Chromosome I and Chromosome II, ensuring the effective elimination of all target pathways.
1. What is the maximum number of genes you can knockout simultaneously?
While the theoretical maximum is higher, we routinely target and successfully verify simultaneous knockouts of 2 to 6 genes in a single multiplex step. More complex strains (up to 10+ deletions) are built using highly efficient sequential editing strategies.
2. How do you ensure the final strain is markerless?
We use markerless deletion methods based on homologous recombination (HDR) that guide the gene deletion without incorporating a resistance cassette. The final selection step often employs a counter-selection marker that is then removed entirely from the genome.
3. Can essential genes be targeted for knockout?
No, a full knockout of an essential gene is typically lethal. For essential genes, we recommend using our CRISPRi service for tunable repression (knockdown) or our Base Editing service for subtle promoter tuning to optimize flux while maintaining viability.
4. How is the knockout confirmed across all target loci?
We confirm successful deletion at all target loci using multiplex PCR to check for the expected genomic rearrangement size, followed by definitive Sanger sequencing of each edited region to ensure a clean, markerless deletion.
5. Is the knockout possible on both V. natriegens chromosomes (Chr I and Chr II)?
Yes. Our gRNA and repair template design protocols are optimized to target specific loci on either Chromosome I or Chromosome II, allowing for deletions across the entire dual-chromosome genome.
6. What is the typical turnaround time for a 3-gene knockout strain?
Due to the high efficiency of multiplex CRISPR and the host's rapid growth rate, the construction and verification of a 3-gene knockout strain can be completed significantly faster than in slower bacterial hosts, though the exact time depends on project complexity and verification needs.
7. Do you use antibiotic selection during the editing process?
We use transient antibiotic selection during the transformation step to isolate colonies that successfully received the editing plasmid. However, the final delivered strains are markerless and free of antibiotic resistance cassettes.
8. What initial input is required from the client for this service?
The client needs to provide the gene names or locus tags of the targets to be knocked out (2 or more) and the desired V. natriegens host strain (e.g., wild-type or a previously modified strain).
CRISPR-Cas9 technology represents a transformative advancement in gene editing techniques. The main function of the system is to precisely cut DNA sequences by combining guide RNA (gRNA) with the Cas9 protein. This technology became a mainstream genome editing tool quickly after its 2012 introduction because of its efficient, simple and low-cost nature.
The CRISPR gene editing system with its Cas9 version stands as a vital instrument for current biological research. CRISPR technology enables gene knockout (KO) through permanent gene expression blockage achieved by sequence disruption. Various scientific domains including disease modeling and drug screening employ this technology to study gene functions. CRISPR KO technology demonstrates high efficiency and precision but requires confirmation and verification post-implementation because unsatisfactory editing may produce off-target effects or incomplete gene knockouts which impact experimental result reliability. For precise and efficient Gene Editing Services - CD Biosynsis, Biosynsis offers comprehensive solutions tailored to your research needs.
The CRISPR-Cas9 knockout cell line was developed using CRISPR/Cas9 gene editing to allow scientists to remove genes accurately for research on gene function and disease models and pharmaceutical discovery. Genetic research considers this technology essential due to its high efficiency together with simple operation and broad usability.
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CD Biosynsis is a leading customer-focused biotechnology company dedicated to providing high-quality products, comprehensive service packages, and tailored solutions to support and facilitate the applications of synthetic biology in a wide range of areas.