TSG-p53® - Model P53N12

Constitutive Knockout

TSG-p53® (Model P53N12) Constitutive Knockout Mouse Model
EZcohort® Models
The easiest way to acquire and breed cryopreserved GEMs
This model is available for immediate cryorecovery.

C57BL/6 Background

  • Model #
  • Genotype
  • Nomenclature
  • P53N12
    B6.129-Trp53tm1Brd N12
  • Contains a disruption of the p53 tumor suppressor gene, the most commonly mutated gene in human cancers
  • Useful for studying p53 gene function or screening potential cancer intervention therapies
  • Homozygous TSG-p53® mice are totally deficient in p53 protein and prone to the development of spontaneous tumors, primarily lymphomas and sarcomas
  • Heterozygous TSG-p53® mice carry one normal p53 allele and have a low rate of spontaneous tumor development
  • Differs from Model P53N5-T in that P53N12-T has been backcrossed for an additional seven generations, thereby reducing genes from the 129 strain

Genetic Background:

C57BL/6 Background


The TSG-p53® mouse was developed in the laboratory of Lawrence A. Donehower and Allan Bradley at the Baylor College of Medicine. The model was created by targeting the Trp53 gene in AB1 ES cells and injecting the targeted cells into C57BL/6 blastocysts. Resultant chimeras were backcrossed to C57BL/6J for two generations (N2). Taconic received stock in 1991. The mice were backcrossed to N3 for caesarean derivation and to N4 immediately after derivation. In 1995, backcrossing of the N4 heterozygote to C57BL/6NTac mice recommenced at Taconic and continued to twelve generations (N12). The line was embryo transfer derived in 1998. Heterozygous and homozygous mice are maintained at N12 through mating of homozygous male mice with heterozygous females.


Available for immediate cryorecovery


Wild type for Nnt mutation





Initial Publication:

Donehower LA, Harvey M, Slagle BL, McArthur MJ, Montgomery CA, Jr, Butel JS, Bradley A. (1992) Mice deficient for p53 are developmentally normal but susceptible to spontaneous tumors. Nature, 356:215-221.

Conditions of Use for EZcohort® Models
EZcohort® models are produced and distributed under rights to patents and intellectual property licensed from various institutions. Taconic Biosciences, Inc. (Taconic) sells EZcohort® models to purchasers, grants to each purchaser a right under Taconic's rights in such licensed patents and intellectual property to use the purchased EZcohort® models in consideration of purchasers' acknowledgement of and agreement to Taconic's Terms and Conditions for the Sale of Products and the following conditions of use:

  • Title to EZcohort® models and biological materials derived from them remains with Taconic.
  • EZcohort® models will be used for research purposes only.
  • EZcohort® models and biological materials derived from them will not be distributed to third parties or used for commercial purposes.
  • Breeders from deliverables can be used for propagation of EZcohort® models or to cross to other strains.
  • Continuation of breeding and crossbreeding of EZcohort® models outside Taconicis permitted for a term of three years post-purchase of the EZcohort® models and is subject to annual confirmation of these EZcohort® Conditions of Use.

Continuation of breeding and crossbreeding after the three year term will require renewal of the EZcohort® Conditions of Use and payment of a fee.

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