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. 2005 Aug 19;95(2):112–117. doi: 10.1111/j.1349-7006.2004.tb03190.x

DNA repair and cancer: Lessons from mutant mouse models

Takatoshi Ishikawa 1,✉, Samuel S‐M Zhang 1,✉, Xiusheng Qin 1,✉, Yoshihisa Takahashi 1,✉, Hideaki Oda 1,✉, Yoko Nakatsuru 1,✉, Fumio Ide 1,2,✉
PMCID: PMC11158213  PMID: 14965359

Abstract

DNA damage, if the repair process, especially nucleotide excision repair (NER), is compromised or the lesion is repaired by some other error‐prone mechanism, causes mutation and ultimately contributes to neoplastic transformation. Impairment of components of the DNA damage response pathway (e.g., p53) is also implicated in carcinogenesis. We currently have considerable knowledge of the role of DNA repair genes as tumor suppressors, both clinically and experimentally. The deleterious clinical consequences of inherited defects in DNA repair system are apparent from several human cancer predisposition syndromes (e.g., NER‐compromised xeroderma pigmentosum [XP] and p53‐deficient Li‐Fraumeni syndrome). However, experimental studies to support the clinical evidence are hampered by the lack of powerful animal models. Here, we review in vivo experimental data suggesting the protective function of DNA repair machinery in chemical carcinogenesis. We specifically focus on the three DNA repair genes, O 6‐methylguanine‐DNA methyltransferase gene (MGMT), XP group A gene (XPA) and p53. First, mice overexpressing MGMT display substantial resistance to nitrosamine‐induced hepatocarcinogenesis. In addition, a reduction of spontaneous liver tumors and longer survival times were evident. However, there are no known mutations in the human MGMT and therefore no associated cancer syndrome. Secondly, XPA mutant mice are indeed prone to spontaneous and carcinogen‐induced tumorigenesis in internal organs (which are not exposed to sunlight). The concomitant loss of p53 resulted in accelerated onset of carcinogenesis. Finally, p53 null mice are predisposed to brain tumors upon transplacental exposure to a carcinogen. Accumulated evidence in these three mutant mouse models firmly supports the notion that the DNA repair system is vital for protection against cancer.

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