ATF2/3/4 Luciferase Reporter Lentivirus

The ATF2/3/4 luciferase reporter lentiviral vector is meticulously designed for sensitive, quantitative, and stable detection of transcriptional activity downstream of the activating transcription factor family. In this vector, the luciferase gene is driven by a minimal promoter located downstream of a multimerized ATF response element. By utilizing a minimal promoter structure, basal expression levels are kept very low, resulting in excellent signal-to-noise ratio and a wide dynamic range upon pathway activation. Packaging the reporter gene into lentiviral particles allows for efficient transduction of both dividing and non-dividing cells, including difficult-to-transfect primary cells and stem cell-derived cell lines, and facilitates stable genomic integration for persistent, long-term measurements. This stability supports reliable longitudinal studies without the need for repeated transfections and minimizes inter-experimental variability.

This reporter gene is broadly applicable to any research area involving ATF-mediated signaling and the integrated stress response (ISR). It can be used to monitor transcriptional output induced by endoplasmic reticulum stressors (e.g., drugs activating the PERK–eIF2α–ATF4 axis), oxidative stress, amino acid deprivation, hypoxia, or other conditions that increase ATF2/3/4 activity, enabling time-resolved analysis of stress adaptation. In drug discovery, it supports primary and secondary screening of small molecule activators or inhibitors of ISR nodes (e.g., PERK, GCN2, HRI, or PKR), as well as counter-screening to assess pathway selectivity and off-target effects. In functional genomics, it can be seamlessly integrated with pooled CRISPR knockout, CRISPRi/CRISPRa, or RNAi libraries to identify genes regulating ATF signaling; it can also be combined with arrayed perturbations to map pathway connections and crosstalk with MAPK/JNK or UPR branches. The stable luminescence signal allows for dose-response characterization, kinetic measurements, and epistasis analysis in diverse cellular contexts, including primary immune cells, neuronal models, and patient-derived cell lines.