CD Biosynsis offers advanced Custom E. coli Gene Knock-in Services for precise and efficient chromosomal integration of target genes. Utilizing powerful recombineering and CRISPR/Cas9 technologies, we can seamlessly insert genes, pathways, or regulatory elements into specific loci within the E. coli genome. This approach is critical for stable expression of recombinant proteins, metabolic engineering, and strain development. Our service encompasses everything from donor DNA design, strain construction, and multi-locus integration to rigorous validation via PCR, sequencing, and functional assays. We specialize in complex engineering projects requiring high precision and stability.
Get a QuoteTraditional plasmid-based expression systems often suffer from instability, copy number variation, and antibiotic resistance marker retention. Genomic gene knock-in overcomes these limitations by integrating the gene of interest directly into the E. coli chromosome. We employ homologous recombination-based methods (like Red/ET recombineering) and the precision of CRISPR/Cas9 editing to achieve targeted integration with high fidelity. This ensures maximum genetic stability and allows for marker-less integration, which is essential for industrial or regulatory compliant applications. Our expertise guarantees the successful construction of optimized microbial chassis strains.
Locus Selection & Optimization
Identification of optimal integration sites (e.g., non-essential genes, highly expressed loci) to maximize target gene expression and strain viability.
Donor DNA Design & Synthesis
Design of homologous arms and incorporation of optimized promoters, terminators, and regulatory elements for controlled expression.
Codon Optimization
Optimization of the target gene sequence for E. coli expression and synthesis of the DNA fragment for subsequent integration.
Recombineering (Red/ET)
Efficient homologous recombination for insertion of large gene fragments or pathways into the E. coli chromosome.
CRISPR/Cas9-Assisted Knock-in
Use of the CRISPR system to induce site-specific double-strand breaks, dramatically boosting knock-in efficiency.
Marker Removal / Curing
Protocols for the seamless removal of selection markers (e.g., antibiotic resistance) after successful integration to create clean, industrial strains.
Multi-Gene Operon Integration
Simultaneous or sequential knock-in of multiple genes to assemble complex metabolic or biosynthetic pathways.
Promoter / Terminator Swapping
Precise engineering of endogenous regulatory elements to modulate expression levels of native or integrated genes.
High-Throughput Strain Screening
Screening and validation of hundreds of integration candidates to select the strain with the best functional performance.
A sequential process ensuring successful integration and verifiable stability.
Target Selection & Donor Design
Chromosomal Integration
Selection & Marker Removal
Validation & Delivery
Design: Optimization of the target gene, flanking sequences, and regulatory elements for the chosen insertion locus.
Synthesis: Fabrication of the linear donor DNA cassette with high-purity synthesis.
Transformation: Introduction of the donor DNA and recombination machinery (Red/ET or Cas9 system) into the host E. coli strain.
Recovery: Controlled growth conditions to facilitate the integration event and initial cell recovery.
Screening: Primary selection for successful integration using antibiotic resistance or counter-selection markers.
Curing: Optional removal of the selection cassette to achieve a marker-less, clean genome.
Stable Genomic Integration
Insertion directly into the chromosome ensures stable inheritance and eliminates the need for continuous antibiotic selection.
High Precision Targeting
Use of CRISPR/Cas9 and recombineering guarantees integration at the exact desired genomic locus with minimal off-target effects.
Marker-less Strain Construction
Advanced counter-selection methods allow for the removal of selection markers, resulting in clean, regulatory-friendly strains.
Complex Pathway Engineering
Expertise in simultaneously or sequentially integrating multiple genes to construct and optimize biosynthetic pathways.
"We needed a highly stable strain for continuous fermentation. CD Biosynsis successfully performed a complex multi-locus gene knock-in, and their comprehensive sequencing validation gave us high confidence in the final strain's stability."
Dr. Samuel Liu, R&D Director
"The team's ability to create a marker-less integration was critical for our food-grade application. The resulting strain was clean, stable, and performed exactly as predicted in our large-scale bioreactors."
Ms. Janet Chen, Lead Bioengineer
"We commissioned them for a tough metabolic engineering project involving the knock-in of six genes. Their sequential integration strategy was flawless, allowing us to move our pipeline forward quickly."
Dr. Kenji Tanaka, Principal Scientist
"The CRISPR-assisted knock-in service dramatically reduced our project timeline. The precision and high efficiency of the integration were crucial for optimizing the yield of our target compound."
Mr. Alex Johnson, Research Manager
"The E. coli Gene Knock-in platform provided a stable alternative to our unstable high-copy plasmids. The resulting protein expression was consistent and reproducible across all batches."
Dr. Maria Gomez, Group Leader
What technologies do you use for gene knock-in?
We primarily utilize two cutting-edge methods: Red/ET recombineering for highly efficient homologous recombination, and CRISPR/Cas9 systems for precise, site-specific integration with high fidelity.
Why choose chromosomal knock-in over plasmid expression?
Chromosomal knock-in provides superior long-term stability and reproducibility because the gene is integrated into the stable host genome, eliminating issues like plasmid loss, variable copy number, and the need for constant antibiotic pressure.
Can you perform knock-in of entire metabolic pathways?
Yes, we have extensive experience in integrating multi-gene operons or entire biosynthetic pathways into the E. coli genome, often at multiple loci, for complex metabolic engineering applications.
What is a marker-less knock-in?
A marker-less knock-in means that after successful gene insertion, the temporary selection marker (e.g., antibiotic resistance gene) is excised from the genome. This results in a clean strain free of foreign DNA sequences, which is ideal for industrial or regulatory compliance.
How do you confirm successful integration?
Our Quality Control includes multi-point PCR analysis to confirm insertion size and locus, and Sanger sequencing of the integration junctions to verify sequence accuracy. Functional assays can be provided upon request.
How much does Metabolic Engineering services cost?
The cost of Metabolic Engineering services depends on the project scope, complexity of the target compound, the host organism chosen, and the required yield optimization. We provide customized quotes after a detailed discussion of your specific research objectives.
Do your engineered strains meet regulatory standards?
We adhere to high quality control standards in all strain construction and optimization processes. While we do not handle final regulatory approval, our detailed documentation and compliance with best laboratory practices ensure your engineered strains are prepared for necessary regulatory filings (e.g., GRAS, FDA).
What to look for when selecting the best gene editing service?
We provide various gene editing services such as CRISPR-sgRNA library generation, stable transformation cell line generation, gene knockout cell line generation, and gene point mutation cell line generation. Users are free to select the type of service that suits their research.
Does gene editing allow customisability?
Yes, we offer very customised gene editing solutions such as AAV vector capsid directed evolution, mRNA vector gene delivery, library creation, promoter evolution and screening, etc.
What is the process for keeping data private and confidential?
We adhere to the data privacy policy completely, and all customer data and experimental data are kept confidential.
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.
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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.