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Traditionally clone selection was based on the disruption of a genetic marker (e.g. blue and white screening based on the disruption of the LacZ gene), plasmid retention was based on antibiotic resistance genes. The development of vectors employing selection modules circumvents these issues and permits growth of bacteria harbouring insert-bearing plasmids only. Typically, the vectors used in these systems express a gene product that is lethal to certain bacterial hosts. The lethal gene is inactivated by insertion of a segment of foreign DNA and therefore, toxicity is relieved. The most efficient technical solution remains the killing of bacteria harbouring an insertless vector, or the selection of bacteria harbouring the recombinant vector, the so-called positive selection. The ccdB technology developed by Delphi Genetics has proven to be a successful approach for constructing positive selection vectors

Because the stabilization relies on the presence of only two genetic elements, one on the plasmid the other in the expression strain, the stabilization technology is readily adaptable into any existing E.Coli based expression platform. Delphi Genetics can customize any vectors and strains by adding the stabilization cassette into the vector and the selection gene into the chromosome of the chosen expression strain. Furthermore Delphi Genetics has developed a comprehensive licensing policy for those who would wish to integrate the stabilization system into an existing platform.

For manufacturing recombinant proteins or DNA, plasmid instability is a significant concern. Typical biomanufacturing processes in prokaryotes require the use of bacterial plasmids as vectors carrying the gene of interest to be over-expressed. It has been demonstrated that the growth of plasmid bearing cells is significantly reduced relative to plasmid free hosts, simply because protein production represents a significant burden on cellular metabolism. This is of significant concern in the Biopharmaceutical Industry as both the yield and the production reproducibility of recombinant molecules are significantly lowered by that fact. Antibiotic resistance genes are the most common selectable markers used in fermentation processes to avoid plasmid free cells to overgrow the culture. However antibiotics are expensive compounds and they (or their degradation products) can contaminate the biomass or production product.

Modern DNA engineering requires efficient and robust molecular tools. The Staby® Operating System, developed by Delphi Genetics is an original set of bacterial strains and vectors integrating unique patented technologies. The use of these products and technologies allows researchers to reach their goal faster and more efficiently. These technologies can be used in a project of any scale (from laboratory scale to industrial processes). The Staby® Operating system is very flexible and its elements can be integrated into your favorite tools, allowing you to add the power of the Delphi-Genetics technologies into your own platform.

Delphi Genetics provides customized plasmid DNA production services, from milligram to gram scale, for your R&D and clinical activities. We take care of your plasmid DNA material for viral vectors production and naked DNA-based gene therapy. Our service includes the supply of: R&D grade for non-clinical use, support for lead identification, clone screening, STABY evaluation. High Quality and GMP grade plasmid DNA for viral and non-viral (pre-)clinical activities.

With thousands of DNA vectors designed and constructed, Delphi Genetics is a Partner of choice to generate your plasmid of interest. Size does not matter, that's the strategy of cloning that drives the success of a plasmid construction. We perform the construction of your vector from strategy design to final plasmid production. We work with standard plasmid DNA as well as with large constructs, such as BAC and Cosmid. Our plasmid DNA construction service includes: Sequences analysis Design and strategy Gene Synthesis Cloning of PCR fragment DNA fragment assembling Site directed mutagenesis DNA sequencing Plasmid productionA new hope for Covid-19 treatment Delphi Genetics more than triples its production capacity and receives GMP certification. New Plasmid DNA production capacities now immediately available. Delphi to attend Phacilitate Leaders World in Miami, Jan 21-24 Delphi Genetics significantly expands its capacities for cGMP plasmid DNA GMP Certification for Plasmid DNA