Cell Tracking & Labelling Reagents

Cell tracking reagents for real-time imaging and clonal lineage analysis

These reagents let you follow individual cells or clonal populations as they divide, migrate, and differentiate, with single-cell resolution. Two main strategies are available. Molecular imaging reporters give you continuous fluorescence and bioluminescence readout, delivered either by integrating lentivirus or by non-integrating minicircle vectors. NGS barcode labelling gives you high-complexity clonal analysis in large populations.

Lentiviral reporter constructs co-express a luciferase reporter and a fluorescent protein under constitutive promoters. When transduced as viral particles, the construct integrates into the genome, so the label passes faithfully to every daughter cell through division. Both pre-packaged lentivirus and plasmid formats are available. Because the reporter is always expressed, you can image cells non-invasively by bioluminescence in vivo. You can also track them by fluorescence in vitro without repeated staining steps.

Minicircle bioluminescent and fluorescent imaging vectors give you a non-viral route to the same labelling work. These small circular DNA elements carry your reporter cassette without the bacterial origin of replication or antibiotic resistance markers that sit in a standard plasmid backbone, so they avoid the immunogenic responses that backbone can provoke. Production runs in an engineered E. coli strain from a dedicated parental plasmid, where inducible PhiC31 recombinase generates the minicircle. Because they remain episomal, they express your gene of interest over the long term without integrating into the genome, and their small size makes tail-vein injection a practical delivery route for in vivo imaging. Expression in tissue runs higher and lasts considerably longer than you would see from a conventional plasmid, which makes minicircle technology an efficient non-viral gene delivery option for your cell tracking experiments.

For clonal tracking across thousands of lineages at once, use high-complexity lentiviral DNA barcode libraries. These integrate a unique sequence into each cell when transduced at low multiplicity of infection, so that on average each cell receives a single barcode. Because the barcodes integrate into the genome, they are stably inherited by all progeny, so every clone can be traced across cell divisions. Libraries with sufficient barcode complexity to uniquely label populations of a million cells or more are available. Depending on the vector configuration, these libraries include a selection marker such as a fluorescent protein and/or antibiotic resistance to help you enrich for transduced cells. After selection or treatment, sequence the barcodes and compare against the founder population to reveal how the clonal composition has changed. This shows you which lineages expanded, contracted, or were lost. This format suits drug resistance studies, tumour evolution models, and large-scale pooled screens.

Choosing Between Cell Tracking Strategies

1. You need to image live cells in real time by fluorescence or bioluminescence. Lentiviral reporter constructs that co-express luciferase and a fluorescent protein from a single vector cover this. Dual-modality imaging lets you switch between plate-reader bioluminescence and microscopy fluorescence readouts from the same population. The pre-packaged virus format simplifies transduction. The plasmid format suits your lab if you produce your own lentiviral particles.
2. You are tracking a small number of defined cell populations over time. Lentiviral reporters with distinct fluorophore variants let you colour-code populations and follow them independently by flow cytometry or fluorescence imaging, without sequencing.
3. You need long-term labelling without integrating DNA into the host genome. Minicircle bioluminescent and fluorescent imaging vectors cover this. With the bacterial backbone and antibiotic resistance markers removed, they remain episomal and drive higher, longer-lasting reporter expression than a conventional plasmid, with little risk of a backbone-driven immunogenic response. Their small size also makes tail-vein injection a practical route for your in vivo imaging work.
4. You need to resolve clonal dynamics across thousands of lineages in a single experiment. High-complexity lentiviral barcode libraries cover this. Million-barcode diversity covers even large starting populations, and sequencing-based readout scales to any throughput you need. You can quantify clonal expansion, contraction, and extinction directly from read counts.
5. Your experiment needs both a fluorescent selection marker and barcode readout in the same construct. Barcode library vectors that include fluorescent protein expression and antibiotic selection cover this need. These let you enrich for transduced cells before sequencing and improve barcode representation across your population.