CD Biosynsis provides specialized Nannochloropsis spp. Multi-Gene Knockout Strain Construction services, enabling the sophisticated metabolic rewiring of this premier oleaginous microalga. While single-gene disruptions are useful for basic functional studies, industrial strain optimization often requires the simultaneous elimination of multiple competitive pathways or redundant gene families. Our platform leverages multiplexed CRISPR-Cas9 and Cas12a systems to perform high-efficiency, multi-locus editing, allowing for the comprehensive redirection of carbon flux from primary biomass toward high-value lipids like EPA and specialized carotenoids.
Constructing multi-gene knockout strains in Nannochloropsis requires navigating complex genetic redundancies and ensuring that cumulative modifications do not compromise cellular viability or photosynthetic efficiency. We utilize advanced poly-cistronic gRNA expression arrays and DNA-free RNP delivery to achieve clean, biallelic disruptions across several genomic targets. By integrating genome-scale metabolic modeling with our "Design-Build-Test-Learn" cycle, we empower researchers to develop "chassis" strains that are stripped of non-essential metabolic drains, providing a streamlined platform for the production of biofuels, nutraceuticals, and high-value marine bioproducts.
Get a QuoteIn Nannochloropsis, many metabolic functions—such as those involved in light-harvesting complex (LHC) regulation or lipid catabolism—are governed by multi-gene families with overlapping functions. Our multi-gene knockout service addresses this by targeting multiple nodes simultaneously, bypassing the phenotypic masking often seen in single-gene mutants. This holistic approach is essential for engineering complex traits, such as reducing the photosynthetic antennae size to improve light penetration in high-density cultures or completely blocking competitive carbon sinks like chrysolaminarin synthesis.
Our platform is particularly adept at creating "minimal genomes" for specific industrial applications. By systematically knocking out genes involved in secondary storage pathways or regulatory inhibitors, we can synchronize the cell's energy expenditure with production goals. We use predictive Flux Balance Analysis (FBA) to ensure that the combined effect of multiple knockouts leads to the desired increase in target metabolite titers without creating lethal metabolic imbalances. Every multi-gene knockout strain is rigorously verified via Next-Generation Sequencing (NGS) to confirm the genetic purity and stability of all targeted loci.
We employ a range of multiplexing technologies optimized for the high gene density and regulatory features of the Nannochloropsis genome.
Poly-cistronic gRNAs
Expression of multiple gRNAs from a single promoter using tRNA or Csy4 processing systems to target 3-5 genes in a single transformation event.
Cas12a Arrays
Utilizing the inherent RNA-processing capability of Cas12a to easily target large gene clusters or redundant enzyme families with high specificity.
Episomal Recycling
Utilizing replicative episomes that can be removed after each round of editing, allowing for the sequential knockout of numerous genes without accumulating antibiotic markers.
Markerless Mutants
Generating "clean" chassis strains free of foreign DNA, essential for regulatory compliance in industrial-scale biomass production.
Carbon Sink Removal
Simultaneous knockout of genes involved in starch (cellulose) and chrysolaminarin synthesis to force carbon flux into triacylglycerols (TAGs).
Antennae Reduction
Knocking out multiple LHC proteins to optimize light utilization efficiency and prevent photo-inhibition in industrial photobioreactors.
Our rigorous pipeline ensures that every modification is precise, stable, and functionally validated within the systems context.
1. Metabolic Modeling & Design
2. Multiplex Vector Assembly
3. Transformation & HTS Screening
4. NGS Verification & Phenotyping
Utilizing genome-scale metabolic models (GEMs) to identify the optimal combination of knockout targets. Bioinformatic design of gRNA arrays with minimal off-target risk.
Synthesis of optimized Cas nucleases and poly-cistronic gRNA constructs. Preparation of RNP complexes for DNA-free delivery.
Deep sequencing (NGS) to confirm successful biallelic disruption at all targeted sites. Full physiological characterization including lipid profiling (GC-MS) and growth analysis. Delivery of verified strains.
Complex Trait Control
The ability to target multiple genes allows for the engineering of complex phenotypes that single-gene knockouts cannot achieve.
Markerless Flexibility
Our RNP and episomal curing techniques allow for infinite rounds of editing without the burden of antibiotic resistance markers.
Biallelic Efficiency
High-efficiency CRISPR platforms ensure that all targeted alleles are disrupted, providing immediate loss-of-function phenotypes.
Validated Stability
Strains are subjected to long-term passage trials to ensure the multi-gene knockout genotype remains stable under industrial conditions.
1. How many genes can you knockout simultaneously in Nannochloropsis?
Using poly-cistronic gRNA arrays, we typically target 3-5 genes in a single round. For more extensive modifications, we use iterative rounds of editing and vector curing.
2. What is the success rate for biallelic disruption of all targets?
While efficiency varies by locus, our optimized platforms generally produce multiple monoclonal lines with the complete set of targeted knockouts for screening.
3. Does knocking out multiple genes slow down the growth rate?
It can. We use Flux Balance Analysis (FBA) during the design phase to predict the impact on growth and select target combinations that maintain industrial resilience.
4. Can you target redundant gene families, such as LHC proteins?
Yes, multiplexed CRISPR is ideal for this. We can design gRNAs to target conserved regions of a gene family or use multiple specific gRNAs to eliminate all isoforms.
5. How do you verify that all genes are actually knocked out?
We utilize targeted Next-Generation Sequencing (NGS) or Sanger sequencing of all targeted loci in monoclonal lines to confirm the loss of functional reading frames.
6. Are the multi-gene knockout strains marker-free?
Yes, by using RNP delivery or transient episomes, we can deliver the final strain without permanent antibiotic markers or foreign DNA integration.
7. What is the typical lead time for a multi-gene project?
Due to the complexity of screening and verification, these projects typically take between 20 to 28 weeks depending on the number of targets.
8. Can you combine multi-gene knockouts with gene overexpressions?
Absolutely. We can design integrated strategies that combine multiplexed knockouts with site-specific knock-ins to fully optimize a metabolic pathway.
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.