AAV with mIP2 promoter driven Cre Inducible TdTomato

This AAV expresses DIO-TdTomato driven by an islet mIP2 promoter.

This promoter is based on the 1.1 Kb regulatory region of mouse pre-proinsulin II gene, also known as ins2, ins-2, ins-II, insulin-II, or Mody4. It is commonly used for beta cell-specific gene expression in the pancreatic islet. (m)INS2 promoter is also referred as the mIP2 or mIP2 promoter.

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).