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DNA Repair—Deficient Xpa and Xpa/p53+/- Knock-Out Mice: Nature of the Models
Harry Van Steeg
National Institute of Public Health and the Environment (RIVM), Laboratory of Health Effects Research, H.van.Steeg@ rivm.nl
Annemieke De Vries
National Institute of Public Health and the Environment (RIVM), Laboratory of Health Effects Research
Conny TH. M. Van Oostrom
National Institute of Public Health and the Environment (RIVM), Laboratory of Health Effects Research
Jan Van Benthem
National Institute of Public Health and the Environment (RIVM), Laboratory of Health Effects Research
Rudolf B. Beems
Laboratory for Pathology and Immunobiology, P.O. Box 1, 3720 BA Bilthoven, The Netherlands
Coen F. Van Kreijl
National Institute of Public Health and the Environment (RIVM), Laboratory of Health Effects Research
Xeroderma pigmentosum (XP) is a rare autosomal recessive disease in which repair of ultraviolet (UV)-induced DNA damage is impaired or is totally absent due to mutations in genes controlling the DNA repair pathway known as nucleotide excision repair (NER). XP is characterized, in part, by extreme sensitivity of the skin to sunlight, and XP patients have a more than 1000-fold increased risk of developing cancer at sun-exposed areas of the skin. To study the role of NER in chemical-induced tumorigenesis in more detail, the authors developed Xpa-/- homozygous knockout mice with a complete defect in NER (designated as Xpa mice or XPA model). Xpa mice develop skin tumors at high frequency when exposed to UV light, and as such, they mimic the phenotype of human XP. Moreover, the Xpa mice also appear to be susceptible to genotoxic carcinogens given orally. Based on these phenotypic characteristics, the Xpa mice were considered to be an attractive candidate mouse model for use in identifying human carcinogens. In an attempt to further increase both the sensitivity and specifi city of the XPA model in carcinogenicity testing, the authors crossed Xpa mice with mice having a heterozygous defect in the tumor suppressor gene p53. Xpa/p53+/- double knockout mice develop tumors earlier and with higher incidences upon exposure to carcinogens as compared to their single knockout counterparts. Here the authors describe the development and features of the Xpa mouse and present some examples of the Xpa and Xpa/p53+/- mouse models' sensitivity towards genotoxic carcinogens. It appeared that the Xpa/p53 +/- double knockout mouse model is favorable over both the Xpa and p53+/- single knockout models in short-term carcinogenicity testing. In addition to the fact that the double knockout mice respond more robustly to carcinogens, they also appear to respond in a very discriminative way. All compounds identified thus far are true (human) carcinogens, and, therefore, the authors believe that the Xpa/p53+/- mouse model is an excellent candidate for a future replacement of the chronic mouse bioassay, at least for certain classes of chemicals.
Key Words: Carcinogenicity testing • genotoxiccarcinogens • nucleotideexcisionrepair • p53 tumor suppressor gene • xerodermapigmentosum • XPA.
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Toxicologic Pathology, Vol. 29, No. 1 suppl,
109-116 (2001)
DOI: 10.1080/019262301753178519
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