Marker Retention service, also known as Plasmid Loss testing service, is offered to determine the percentage of cells in a cell sample that contains a selectable marker such as antibiotic resistant gene. In microbial cell culture process, a bacteria stain may lose its antibiotic resistance due to the loss of its resistant-coding plasmid, an undesirable event in biologics manufacturing.
Test sample will be tested for the presence or absence of the selective marker, such as an antibiotic resistant gene coded in the plasmid in E. Coli. Test sample, positive, and negative cells will be plated to obtain isolated colonies. Results will be reported as the percentage of cells retaining the marker, or percentage of plasmid loss.
A report with the following information will be delivered: images of selective and non-selective growth plates, colony counts, and calculation of percentage of marker retention or plasmid loss.
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CGMP/GLP Compliant
Genomics & Biological Services
Experienced scientists functioning as project managers or study directors
Independent quality unit assuring regulatory compliance
Methods validated per ICH GLP/GMP guidelines – also research grade testing available
Rigorous sample tracking and handling procedures to prevent mistakes and cross-contamination
Controlled laboratory environment to prevent cross-contamination
When you partner with Avance Biosciences, we give you undivided attention, share our experience and knowledge, and respond to your needs in a timely manner. Contact our technical staff to discuss how we can support you in your project!
Dedication to Quality
The Avance Biosciences team is committed to strict adherence to cGMP and GLP regulations enacted by the US, European, Japanese, and other international regulatory agencies.
Extensive Experience
Our team has extensive knowledge and experience working with scientists, QA/QC professionals, and project managers from over 100 pharmaceutical and biotechnology companies and organizations throughout the world.
Open Communication
Transparency and integrity are two of our core values. Our well-trained, friendly, and professional study directors and project managers strive to complete your projects on-time with open communication channels and to your specifications.
Cutting Edge Science
Avance Biosciences’ cGMP/GLP compliant genomic and microbial assays make use of the advanced technologies including real-time PCR, ddPCR, Sanger sequencing, next-gen sequencing, Southern blot, and more.