EF1a-SV40/LTA(Bla) Lentiviral Particles

The EF1a-SV40/LTA(Bla) Lentiviral Particles represent a specialized genetic tool designed for the robust and stable expression of the Simian Virus 40 Large T Antigen (SV40 LTA) in mammalian systems. This lentiviral vector utilizes the human elongation factor 1 alpha (EF1a) promoter, which is highly valued for its ability to drive strong, constitutive transgene expression across a wide variety of cell types, including primary, stem, and progenitor cells where other promoters might face silencing. The SV40 LTA itself is a potent viral oncoprotein that functions by inactivating key host tumor suppressor proteins, specifically p53 and the retinoblastoma (pRb) family, thereby promoting continuous cell cycle progression. To ensure the reliability of experimental outcomes, the particles incorporate a blasticidin resistance gene (Bla), which serves as a selectable marker for the rapid isolation of successfully transduced cells. This third-generation, replication-deficient system is engineered for high biosafety and efficient integration into the host genome, providing a permanent genetic modification solution.

The primary application of these lentiviral particles is the immortalization of primary cell lines, allowing researchers to extend the proliferative lifespan of cells that would otherwise undergo senescence. By bypassing natural cell cycle checkpoints, the SV40 LTA enables the creation of stable, long-term cell models from finite clinical or primary tissue samples. Beyond immortalization, these particles are extensively utilized in molecular biology to investigate the mechanisms of viral oncogenesis, DNA replication, and cellular transformation. The use of a lentiviral delivery system is particularly advantageous for hard-to-transfect cell populations, ensuring high transduction efficiency and uniform expression within the culture. Additionally, the blasticidin selection marker streamlines the generation of stable cell pools, making this tool indispensable for high-throughput screening, protein production assays, and functional genomics studies where consistent protein expression is required over multiple passages.