AAV-1 Assay Kit

Background: Adeno-associated viruses (AAVs) are derived from defective parvoviruses, which depend on essentialhelper functions provided by other viruses, such as adenovirus and herpes virus, for efficient viral replication and propagation. AAV has no etiologic association with any known diseases and has been successfully used to establish efficient and long-termgene expression in vivo in a variety of tissues without significant cellular immune responses or toxicity. AAV has a single-stranded DNA genome which consists of approximately 4.7 kb. All characterized AAV serotypes share three key features, including two copies of AAV terminal repeats (ITRs), one rep region and one cap region. The ITRs are capable of forming T-shape secondary structure and are the only cis elements that are required for AAV replication, packaging, integration, and rescue. The rep region encodes four overlapping proteins designated as Rep78, Rep68, Rep52, and Rep40, according to the apparent molecular mass of the protein. In addition to their well-defined roles in AAVreplication, Rep proteins also regulate AAV packaging and site-specific integration. The cap region encodes three structural proteins,VP1, VP2, and VP3. These three proteins share the same reading frame (see Figure 1). AAV Helper-Free System allows the production of infectious recombinant human adeno-associated virus (rAAV) virions without the use of a helper virus (Figure 2). In the AAV Helper-Free System, most of the adenovirus gene products required for the production of infective AAV particles are supplied on the plasmid pHelper (i.e. E2A, E4, and VA RNA genes) that is co-transfected into cells with human AAV vector DNA. The remaining adenoviral gene product is supplied by the 293 host cells, which stably express the adenovirus E1 gene. By eliminating the requirement for live helper virus the AAV Helper-Free System provides a safer and more convenient gene delivery system. In the AAV Helper-Free System, the rep and cap genes have been removed from the viral vector that contains AAV-2 ITRs and are supplied in trans on the plasmid pAAV-RC. The removal of the AAV rep and cap genes allows for insertion of a gene of interest in the viral genome. AAV Helper-Free System can accommodate inserts of up to 3 kb (See Table 1 for detail). Recombinant adeno-associated viruses are important tools for gene delivery and expression. AAV has not been reported to cause any diseases. Together with its replication defective nature, AAV has good safety profile to be used in gene transfer in vivo, and as potential gene therapy vehicles. Recombinant AAV is capable of infecting a broad range of cell types including non-dividing cells and remaining as concatemers for long-term expression. Compared with other viral vectors such as adenovirus, AAV elicits very mild immune response in animal models.

Small volumes of AAV-1 assay kit vial(s) may occasionally become entrapped in the seal of the product vial during shipment and storage. If necessary, briefly centrifuge the vial on a tabletop centrifuge to dislodge any liquid in the container`s cap. Certain products may require to ship with dry ice and additional dry ice fee may apply.

MBS169420 is an assay kit targeting AAV-1. Also known as AAV-1 Helper Free Expression System.