Humanized Liver CYP3A4 Mouse

Model Description

• This model carries disruptions or deletions of all eight full-length mouse Cyp3a genes identified as well as a transgene encoding human CYP3A4 under the control of a liver-specific promoter (human APOE)
• Contains two targeted regions, a single gene knockout of the Cyp3a13 gene, and a cre-mediated deletion of the following gene cluster: Cyp3a11, Cyp3a16, Cyp3a25, Cyp3a41, Cyp3a44, Cyp3a57, Cyp3a58-ps, Cyp3a59
• In humans, CYP3A enzymes metabolize most drugs
• Model 9011 serves as the knockout control
• May be used with model 9047, which has gut-specific expression of human CYP3A4, to compare the contributions of gut versus liver metabolism to the biotransformation of a test article

Origin:
The Liver Humanized CYP3A4 Mouse was developed by Alfred Schinkel at the Netherlands Cancer Institute. The model was generated by targeting of the Cyp3a13 gene in 129P2/OlaHsd-derived E14 ES cells to replace the putative promoter region and exons 1 and 2 with a Pgk-hygromycin cassette. Targeted ES cells were injected into blastocysts. Resultant chimeras were backcrossed to FVB/N for at least seven generations. To generate the cluster deletion, the intronic sequence between exon 2 and 3 of Cyp3a57 was replaced with a neo cassette containing a loxP site, and a hygromycin cassette with a loxP site was inserted downstream of the Cyp3a59 gene in 129P2/OlaHsd-derived E14 ES cells through gene targeting. Transfection of the ES cells with cre recombinase resulted in the deletion of Cyp3a57, Cyp3a16, Cyp3a41, Cyp3a44, Cyp3a11, Cyp3a25 and Cyp3a59. The targeted ES cells were injected into blastocysts. Resultant chimeras were backcrossed two generations to FVB/N. Mice with the cluster deletion were then backcrossed to the Cyp3a13 targeted mutation line for at least four generations to generate a model with disruption or deletion of all eight full-length mouse Cyp3a genes. The Tg(APOE-CYP3A4)A1Ahs transgene was generated by microinjection into FVB/N zygotes. The Cyp3a knockout line was backcrossed to the Tg(APOE-CYP3A4)A1Ahs line for at least three generations. Taconic received stock in 2008, and the line was embryo transfer derived by mating male and female mice homozygous for both targeted regions and homozygous for the transgene. The line is maintained by mating male and females homozygous for the Cyp3a13 disruption, the cluster deletion and the transgene.

Color: Albino

Initial Publication:

van Herwaarden AE, Smit JW, Sparidans RW, Wagenaar E, van der Kruijssen CM, Schellens JH, Beijnen JH, Schinkel AH. (2005) Midazolam and cyclosporin a metabolism in transgenic mice with liver-specific expression of human CYP3A4. Drug Metab Dispos 33(7):892-5.

van Herwaarden AE, Wagenaar E, van der Kruijssen CM, van Waterschoot RA, Smit JW, Song JY, van der Valk MA, van Tellingen O, van der Hoorn JW, Rosing H, Beijnen JH, Schinkel AH. (2007) Knockout of cytochrome P450 3A yields new mouse models for understanding xenobiotic metabolism. J Clin Invest 117(11):3583-92.

Animal Diet: NIH #31M Rodent Diet

Licensing Requirements:

Non-profit users (excluding users at non-profit foundations which are affiliated with a for-profit entity): Taconic Non-Profit MTA.

Pricing for non-profit users (excluding users at non-profit foundations which are affiliated with a for-profit entity):

9048

For-profit users (including users at non-profit foundations which are affiliated with a for-profit entity): Taconic For-Profit MTA.

Pricing for for-profit users (including users at non-profit foundations which are affiliated with a for-profit entity):

9048

Availability: Immediate availability of appropriately-sized cohorts.

Health Reports/Production Sites

View the production locations(s) and the accompanying current IHMS^TM Health Report and Taconic Health Standard for this model

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