Mouse albumin (Alb) gene promoter paired with its far-upstream enhancer, directing transgene expression almost exclusively to differentiated hepatocytes in transgenic mice. Standard promoter for liver-specific Cre driver lines (Alb-Cre) and hepatic transgene expression in mouse models of liver disease, drug metabolism, and lipid biology.
Length: 2336 bp
Strength: strong
Tissue: Differentiated hepatocytes; requires the far-upstream enhancer for efficient liver-specific expression
Expression: constitutive
Origin: Mouse albumin gene, proximal promoter plus far-upstream enhancer
Characteristics
The albumin proximal promoter alone gives only weak expression in transgenic mice; a far-upstream enhancer located 8.5-10.4 kb 5' of the promoter is required together with it for efficient, high-level liver-specific expression, while the intervening -8.5 to -0.3 kb region is dispensable. Alb-Cre transgenic mice, which express Cre recombinase from this promoter/enhancer combination, are the standard line for hepatocyte-specific gene knockouts crossed against loxP-flanked alleles. Cre-mediated excision in Alb-Cre liver is not complete at birth — recombination proceeds progressively over the first several weeks of postnatal life rather than occurring immediately in all hepatocytes.
Applications: Hepatocyte-specific Cre expression (Alb-Cre) for conditional gene knockouts in mouse models of liver disease, drug metabolism, and lipid biology, crossed against loxP-flanked target alleles. Also used directly to drive liver-restricted transgene expression in non-Cre constructs.
Limitations: The proximal promoter alone gives only weak expression; efficient liver-specific activity requires pairing with the far-upstream (8.5-10.4 kb) enhancer, so a minimal promoter-only construct will underperform. In Alb-Cre mice, recombination of loxP-flanked alleles is incomplete at birth and increases progressively with postnatal age, so experiments requiring complete embryonic or neonatal knockout should not assume immediate full excision.
Pinkert et al. (1987).
An albumin enhancer located 10 kb upstream functions along with its promoter to direct efficient, liver-specific expression in transgenic mice.
Genes Dev - Pinkert 1987 Albumin Enhancer
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