AAV with ALB(1.7) promoter driven Cre Inducible EYFP

This AAV expresses DIO-EYFP driven by a liver ALB(1.7) promoter.

The ALB(1.7) is a shorter version of the ALB(1.9) promoter with a total length of 1.7 Kb. In mouse liver cells, the transgene expression from this ALB(1.7) synthetic promoter is about 3-5 times lower than that of the ALB(1.9) promoter but 20-200 fold greater than that of the CMV promoter 10-20 weeks after plasmid injection into mouse liver.

In the DIO scenario, the transgene of interest is inserted in reverse orientation relative to the 5′ promoter and is flanked by oppositely oriented loxP and lox2272 sites. In the absence of Cre expression, the transgene will not be produced. In the presence of Cre expression, the transgene will be “FLip-EXchanged” or FLEXed, leading to expression of the transgene. This is due to a permanent Cre-mediated recombination/inversion of the flanked transgene. This arrangement is called DIO (double-floxed inverse ORF), Cre-ON, Flex-rev (reverse), Flex-ON/FlexON, or DIO-AAV/AAV-DIO (double-floxed inverse ORF in AAV).