CD Biosynsis offers expert Corynebacterium glutamicum Gene Knock-in Services for the stable and efficient integration of desired genetic material into the host chromosome. This service is foundational for metabolic engineering and the development of high-yield strains, allowing for the introduction of novel biosynthetic pathways or the targeted overexpression of native genes. We utilize highly optimized CRISPR-Cas9 systems to precisely create a double-strand break (DSB) at the target locus, maximizing the efficiency of Homology-Directed Repair (HDR). Our method guarantees marker-free, stable chromosomal integration of both small gene cassettes and large heterologous pathways, providing a robust and reliable chassis for the commercial production of amino acids, proteins, and fine chemicals.
Get a QuoteFor industrial applications involving C. glutamicum, stable production requires that all engineered genetic material be permanently integrated into the chromosome rather than carried on unstable plasmids. Our CRISPR-Cas9-assisted Knock-in approach ensures this stability and is critical for achieving high cell density fermentation and consistent product yield over multiple generations. By precisely targeting safe harbor loci or specific metabolic pathway genes, we minimize unintended genomic disruption while ensuring the optimal expression and function of the integrated pathway. This precision is key to developing strains that perform reliably at the commercial scale.
Small Gene Cassette Knock-in
Integration of single genes, regulatory elements (promoters, terminators), or reporter genes (e.g., GFP) into precise genomic locations.
Point Mutation/SNP Knock-in
Precision insertion of single nucleotide polymorphisms (SNPs) to alter regulatory sequences or modify enzyme binding sites (e.g., eliminating feedback inhibition).
Overexpression Cassette Integration
Insertion of gene copies under strong, constitutive, or inducible promoters for enhanced protein or enzyme production.
Large Heterologous Pathway Knock-in
Stable chromosomal insertion of multi-gene biosynthetic pathways (e.g., 5-10 genes) for producing non-native compounds.
Multiplex Integration
Simultaneous or sequential insertion of multiple genes or pathway modules into different genomic loci to achieve balanced pathway expression.
Safe Harbor Integration
Targeting neutral genomic sites (Safe Harbors) to ensure high, stable expression without disrupting essential host functions.
Marker-Free Knock-in
Integration protocols designed to eliminate all selection markers from the final engineered strain, ideal for industrial scale-up and regulatory submission.
Expression Level Tuning
Knock-in of defined Promoter/RBS libraries to precisely fine-tune the expression level of the inserted genes for optimal metabolic flux.
Our process leverages CRISPR precision and rigorous quality control to ensure stable and correct integration.
1. Design & Donor Construction
2. Editing Vector & Transformation
3. Clone Selection & Curing
4. Genetic Validation (QC)
Bioinformatic design of specific sgRNA and optimization of the target locus.
Design and synthesis of the repair donor DNA containing the insert and homology arms.
Optimization of expression cassettes (Promoter/RBS) for intended expression level.
Construction of the Cas9/sgRNA delivery vector.
High-efficiency transformation of the C. glutamicum host via electroporation or optimized conjugation.
Introduction of the donor DNA for Homology-Directed Repair (HDR).
Selection of positive transformants using selection markers (if applicable).
Curing of the Cas9 expression plasmid to ensure the stability of the final edited strain.
Isolation and expansion of marker-free, engineered clones.
Novel Biosynthetic Pathway Integration
Stable chromosomal integration of heterologous gene clusters to enable the production of non-native secondary metabolites or fine chemicals.
Enhanced Strain Stability
Moving genetic circuits from unstable plasmids to the chromosome, ensuring reliable gene expression and product yield during large-scale fermentation.
Reporter and Tagging Integration
Insertion of fluorescent tags (e.g., mCherry, GFP) or affinity tags (e.g., His-tag) for protein localization studies and simplified purification.
Metabolic Feedback Detuning
Precision point mutation knock-in to engineer native enzymes, reducing or eliminating allosteric feedback inhibition for increased flux.
"The integration of our four-gene pathway into the C. glutamicum safe harbor locus was seamless. The resulting strain showed stable expression and a 40% increase in product titer compared to our previous plasmid system."
Dr. Chen, Head of Strain Engineering, Industrial Bio-producer
"We needed a marker-free, stable overexpression cassette. CD Biosynsis delivered the strain quickly and the QC sequencing was flawless at both integration junctions."
Mr. David Smith, Project Manager, Synthetic Biology Research Group
"The ability to perform a precision point mutation knock-in was critical. It allowed us to detune feedback inhibition on a native enzyme, which dramatically improved our metabolic flux."
Dr. Lena Koo, R&D Scientist, Fine Chemical Synthesis
"The final strain was validated for genetic stability, giving us the confidence to move directly into pilot-scale production without concerns about plasmid loss or instability."
Dr. Alan Rivas, Lab Director, Applied Microbiology Institute
Why is chromosomal knock-in preferred over plasmid-based expression in C. glutamicum?
Plasmids can be lost during large-scale, non-selective fermentation, leading to reduced yield and instability. Chromosomal knock-in is permanent and stable over hundreds of generations, making it ideal for industrial scale-up.
What is the maximum size of DNA you can insert?
While the capacity depends on the target locus, our optimized CRISPR-HDR system can efficiently integrate large gene clusters, typically up to 10-15 kb in size, suitable for most full biosynthetic pathways.
What is a "Safe Harbor" locus and why do you use it?
A Safe Harbor locus is a non-essential genomic region confirmed not to interfere with host growth or core metabolism. Targeting these sites ensures the integrated pathway expresses stably without negatively impacting cell fitness.
How do you ensure the sequence fidelity of the knock-in?
We perform rigorous Quality Control (QC) by Sanger Sequencing across the full insert and, critically, across the two integration junctions (where the new DNA meets the chromosome) to confirm precise, error-free insertion.
Do you offer marker-free integration services?
Yes. We specialize in marker-free knock-in protocols, which involve subsequent removal (curing) of any temporary selection markers, leaving a clean, industrial-grade genomic modification.
Can you perform multiple knock-ins (multiplex integration)?
Yes. We construct strains with sequential or simultaneous multiplex integration, allowing us to build complex, multi-modular pathways by inserting different components into multiple chromosomal loci.
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.