CD Biosynsis specializes in Bacillus subtilis Multi-Gene Knockout Strain Construction, providing the most advanced solution for systematically disabling multiple genes in the host genome. This service is essential for complex metabolic engineering projects, functional genomics studies, and developing superior production strains by eliminating byproduct pathways and removing redundant proteases. We leverage optimized CRISPR-Cas9 systems, enabling the simultaneous or sequential knockout of up to 10 genes with high efficiency and precision. Our proven methods guarantee the genetic stability and sequence integrity of the resulting multi-knockout strains, accelerating your efforts to create highly streamlined B. subtilis chassis organisms.
Get a QuoteCreating an ideal microbial production chassis often requires more than just a single gene modification. Multi-gene knockout is critical for several applications: Metabolic Flux Redirection (disabling pathways that compete for precursors), Protein Expression Enhancement (removing host proteases to prevent product degradation), and Functional Genomics (systematically studying gene redundancy). Our platform overcomes the technical challenges associated with sequential or simultaneous multiple editing in B. subtilis, guaranteeing the precise, permanent inactivation of target genes without introducing undesirable markers or instability, forming the foundation for next-generation bio-production strains.
CRISPR-Cas9 Multiplex Editing
Simultaneous inactivation of up to five genes in a single step using multiple sgRNAs and a highly efficient CRISPR vector with marker recycling.
Sequential Marker-Free Knockout
Step-by-step editing using a streamlined process that allows the reuse of selection markers, resulting in a completely marker-free, stacked knockout strain.
Targeted Deletion (Large Fragments)
Precise deletion of large genomic regions (e.g., biosynthetic clusters or operons) using long homologous arms and CRISPR-mediated double-strand breaks.
Protease Knockout (Protein Expression)
Deletion of host protease genes (e.g., Vpr, NprE) to generate a stable chassis that significantly reduces the degradation of secreted recombinant proteins.
Byproduct Pathway Elimination
Inactivating competing metabolic routes that divert carbon flux away from the desired end product, crucial for maximizing titer in metabolic engineering.
Chassis Minimization
Systematic knockout of non-essential genes to create a minimal, defined chassis with streamlined growth and improved genetic tractability.
sgRNA High-Specificity Design
Bioinformatic design to select sgRNAs with confirmed on-target activity and zero predicted off-target activity, critical for complex strains.
Verification of Essentiality
Pre-project screening to assess the essentiality of target genes and predict the growth impact of single and combinatorial knockouts.
Genomic Stability Checks
Proactive design and testing to prevent genomic instability or unintended compensatory mutations resulting from extensive editing.
A rigorous, multi-stage process ensures the precise construction and full validation of every knockout locus.
1. Design & Strategy Planning
2. Multiplex Editing & Clone Selection
3. Genetic Validation (QC)
4. Delivery & Documentation
Bioinformatic analysis and sgRNA design for all target genes.
Selection of multiplex vs. sequential editing strategy based on project goals.
Synthesis and cloning of repair templates and Cas9 expression components.
Transformation of the B. subtilis host and implementation of the chosen editing cycle.
High-throughput screening and selection of positive clones after each modification step.
Confirmation of marker removal (if sequential editing is used).
Delivery of the final, fully verified multi-gene knockout strain (e.g., \Delta geneA \Delta geneB\Delta geneC...).
Provision of a detailed Certificate of Analysis (CoA) including sequencing traces and QC data.
High-Plex Knockout Capacity
Proven ability to successfully construct strains with up to 10 simultaneous or sequential deletions, accelerating complex strain development.
Marker-Free Strain Construction
Protocols designed to deliver final strains that are completely free of selection markers, ensuring regulatory compliance and stability.
100% Sequence Fidelity QC
Every single knockout locus is Sanger sequenced to guarantee the precise deletion and absence of unintended point mutations.
Metabolic Engineering Focus
Expert consultation on selecting optimal byproduct and protease targets for multi-knockout, maximizing host utility.
"We needed a B. subtilis strain with six protease genes knocked out to stabilize our secreted enzyme. The final $\Delta6$ strain was delivered flawlessly with complete sequencing confirmation of all deletions."
Dr. Chen, Head of Strain Engineering, Industrial Biocatalyst Firm
"The multiplex editing approach significantly cut down our development time. They successfully performed three simultaneous knockouts in one cycle, which was crucial for redirecting metabolic flux."
Mr. David Smith, Project Manager, Metabolic Pathway Optimization Group
"The ability to deliver a completely marker-free, multi-knockout chassis was a major deciding factor. The strain performed excellently in our scaled-up fermentation tests."
Dr. Lena Koo, R&D Scientist, Food & Beverage Ingredient Manufacturer
"Their expertise in sgRNA design for challenging, multi-target deletion was evident. We experienced zero off-target events, ensuring the integrity of our core genome remained intact."
Dr. Alan Rivas, Lab Director, Applied Microbiology Institute
What is the maximum number of genes you can knock out?
We routinely perform up to 5 simultaneous knockouts in a single step (multiplex editing). Using sequential, marker-free methods, we have successfully constructed strains with up to 10 or more total deletions.
What is the difference between multiplex and sequential knockout?
Multiplex editing targets multiple genes at once in a single transformation cycle. Sequential editing targets one or two genes per cycle, allowing for marker removal between steps, ensuring higher control and stability for complex edits.
How do you ensure the strain is marker-free?
We use systems that allow the selection marker to be recycled or cleanly removed after the successful deletion event, resulting in a final genome that contains only the desired deletions.
Why is knocking out proteases important in B. subtilis?
B. subtilis naturally secretes several proteases. Knocking out these genes (e.g., Vpr, NprE) is essential to prevent the degradation of secreted recombinant proteins and maximize the yield of the target product.
How is the success of each knockout verified (QC)?
The success of every single knockout locus is verified by PCR analysis (to confirm the deletion size) followed by Sanger Sequencing across the edited region to confirm sequence accuracy and integration.
Can I knock out essential genes?
Essential genes cannot be completely knocked out unless a complementary, inducible copy is simultaneously introduced, or the deletion is part of a larger, balanced pathway modification. We first assess essentiality bioinformatically.
What if the combined knockouts affect the strain's growth rate?
We perform preliminary growth curves and phenotypic assessments. If a severe growth defect occurs, we offer strategies like Adaptive Laboratory Evolution (ALE) or compensatory mutations to restore fitness while maintaining the deletions.
What are the deliverables for this service?
The final deliverables include the fully verified multi-knockout strain (e.g., frozen stock), a detailed Certificate of Analysis (CoA), and all raw sequencing data verifying the modification of every single target locus.
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.
If your question is not addressed through these resources, you can fill out the online form below and we will answer your question as soon as possible.
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.