Human Molecular Genetics, 2001, Vol. 10, No. 7 735-740
© 2001 Oxford University Press
Deficient DNA mismatch repair: a common etiologic factor for colon cancer
Division of Human Cancer Genetics, Comprehensive Cancer Center, Ohio State University, 690 Tzagournis Medical Research Facility, 420 West 12th Avenue, Columbus, OH 43210, USA
Received 10 January 2001 ; Accepted 15 January 2001.
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ABSTRACT |
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 TOP ABSTRACT DNA MISMATCH REPAIRHEREDITARY NON-POLYPOSIS COLON...SPORADIC COLON CANCERS WITH...TUMORIGENESIS IN THE CONTEXT...HNPCC—NOT A MERE MMR...NON-POLYPOTIC COLON CANCER...REFERENCES |
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Hereditary non-polyposis colon cancer (HNPCC), the most common form of hereditary colon cancer, is a syndrome of deficient DNA mismatch repair (MMR). Five, possibly six, human MMR genes have been identified that, when mutated in the germline, cause susceptibility to this syndrome. To date, more than 300 different predisposing mutations are known, mainly affecting the MMR genes MLH1 (
50%), MSH2 (40%) and MSH6 (10%). Genetically predisposed individuals carry a defective copy of an MMR gene in every cell. Somatic inactivation of the remaining wild-type copy in a target tissue, typically colon, gives rise to a profound repair defect, progressive accumulation of mutations and cancer. Instability at short tandem repeat sequences, microsatellites, is a typical manifestation of MMR deficiency and apart from HNPCC tumors, occurs in ~15% of sporadic colon and other tumors. The majority of the latter cases are attributable to one particular MMR gene, MLH1, and unlike HNPCC, an epigenetic rather than a genetic mechanism plays an important role in the inactivation of this gene. The present review provides an update of the genetics of HNPCC and more generally, of cancer development driven by deficient MMR. Recent discoveries suggest that apart from post-replication repair, MMR proteins have several other functions that are highly relevant to carcinogenesis. Knowledge of the complex interplay between the MMR system and other cellular pathways allows us to better understand the phenotypic manifestations of HNPCC and other cancers with deficient MMR. |
DNA MISMATCH REPAIR |
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TOPABSTRACTDNA MISMATCH REPAIRHEREDITARY NON-POLYPOSIS COLON...SPORADIC COLON CANCERS WITH...TUMORIGENESIS IN THE CONTEXT...HNPCC—NOT A MERE MMR...NON-POLYPOTIC COLON CANCER...REFERENCES |
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Several recent reviews are available on the basic process of mammalian DNA mismatch repair (MMR) (1–3). The primary function of this system is to eliminate base–base mismatches and insertion–deletion loops which arise as a consequence of DNA polymerase slippage during DNA replication (Fig. 1). The former lesions typically affect non-repetitive DNA and lead to single base substitutions (for example, G
T). Insertion–deletion loops affect repetitive DNA and involve gains or losses of short repeat units (CA) within microsatellites [(CA)12 in Fig. 1], which is referred to as microsatellite instability (MSI). In humans, at least six different MMR proteins are required. For mismatch recognition, the MSH2 protein forms a heterodimer with two additional MMR proteins, MSH6 or MSH3 (the resulting complexes are called hMutS
and hMutSß, respectively) depending on whether base–base mispairs or insertion–deletion loops are to be repaired. In the former case, MSH6 is required whereas in the latter, MSH3 and MSH6 have partially redundant functions (4,5). A heterodimer of MLH1 and PMS2 (hMutL) coordinates the interplay between the mismatch recognition complex and other proteins necessary for MMR. These proteins may include at least proliferating cell nuclear antigen, DNA polymerases 
and 
, single-stranded DNA-binding protein and possibly helicase(s). Besides PMS2, MLH1 may heterodimerize with two additional proteins, MLH3 and PMS1. According to recent findings (6), the MLH1–MLH3 complex (like the MLH1–PMS2 complex) primarily functions in the repair of insertion–deletion loops whereas the role (if any) of the MLH1–PMS1 complex (hMutLß) in MMR is yet to be characterized (7,8).
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HEREDITARY NON-POLYPOSIS COLON CANCER—AN MMR DEFICIENCY SYNDROME |
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TOPABSTRACTDNA MISMATCH REPAIRHEREDITARY NON-POLYPOSIS COLON...SPORADIC COLON CANCERS WITH...TUMORIGENESIS IN THE CONTEXT...HNPCC—NOT A MERE MMR...NON-POLYPOTIC COLON CANCER...REFERENCES |
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Hereditary non-polyposis colon cancer (HNPCC) is the most common form of hereditary colon cancer, accounting for 5–8% of all colon cancers (9). According to the international diagnostic criteria (Amsterdam criteria I) at least three close relatives should be affected with colon cancer in two successive generations and the age at diagnosis should be <50 years in at least one (10). In addition to colon cancer, HNPCC patients often have an excess of extra-colonic cancers, notably endometrial cancer, and to a lesser extent other cancers, including cancers of the small bowel, ureter and renal pelvis. The diagnostic criteria were recently revised to take these extra-colonic cancers into account (Amsterdam criteria II) (11). From the first clinical description of HNPCC (12) it took 80 years before the first HNPCC locus (MSH2) was genetically mapped (13) and 7 years later, researchers finally reported the identification of the actual predisposing mutation in the Warthin’s family (14).
The International Collaborative Group on HNPCC maintains a database of HNPCC-associated mutations (http://www.nfdht.nl). To date, the database contains information on more than 300 different predisposing mutations that occur in over 500 HNPCC families from all parts of the world. The majority of the mutations affect two genes, MSH2 and MLH1, whose protein products are indispensable for MMR (Fig. 1). These mutations commonly impair the necessary protein–protein or protein–DNA interactions. MSH2 and MLH1 mutations often (albeit not invariably) give rise to ‘classical’ HNPCC families that fulfil the Amsterdam criteria I and have a high degree of MSI in tumors. [According to international criteria, high-degree of MSI is defined as instability at 
2/5 loci, or 30–40% of studied loci, whereas instability at fewer loci is referred to as MSI-low (16).] In recent years, the number of reported MSH6 mutations has steadily increased (Table 1; 17–22). MSH6 mutations often occur in clinically less typical HNPCC families with one or more of the following features: late onset, frequent occurrence of endometrial cancer and low degree of microsatellite instability in tumor tissue. Finally, preliminary observations suggest that the newly discovered MMR gene MLH3 may also be mutated in the germline in some suspected HNPCC families with a variable degree of MSI in tumor tissue (23).
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SPORADIC COLON CANCERS WITH MSI |
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TOPABSTRACTDNA MISMATCH REPAIRHEREDITARY NON-POLYPOSIS COLON...SPORADIC COLON CANCERS WITH...TUMORIGENESIS IN THE CONTEXT...HNPCC—NOT A MERE MMR...NON-POLYPOTIC COLON CANCER...REFERENCES |
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MSI, a hallmark of HNPCC, occurs in ~15% of sporadic tumors from the colorectum and other organs as well (16). Sporadic counterparts of tumors of the HNPCC spectrum (24), endometrial and gastric cancer, for example, typically show a high degree of instability (an MSI-low subset also exists) whereas MSI-low is a predominant pattern in tumors not belonging to the HNPCC spectrum. The majority of MSI-high tumors are due to inactivation of MLH1, which mostly results from promoter hypermethylation rather than somatic mutations or loss of heterozygosity (25). Studies on cell lines have shown that promoter hypermethylation is often biallelic (26). This DNA methylation disorder, the mechanism of which is unknown, is already present in colorectal adenomas and has several other gene targets besides MLH1 (27,28). The MMR genes MLH1 and MSH2 do not seem to be implicated in the MSI-low subset (29,30). Aberrant DNA methylation that may involve a DNA repair pathway separate from MMR has been proposed to be a possible underlying defect in this group (31).
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TUMORIGENESIS IN THE CONTEXT OF MMR DEFICIENCY |
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TOPABSTRACTDNA MISMATCH REPAIRHEREDITARY NON-POLYPOSIS COLON...SPORADIC COLON CANCERS WITH...TUMORIGENESIS IN THE CONTEXT...HNPCC—NOT A MERE MMR...NON-POLYPOTIC COLON CANCER...REFERENCES |
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Mutation rates in tumor cells with MMR deficiency are 100–1000-fold as compared with normal cells (32,33). Apart from anonymous microsatellites, these mutations affect important growth-regulatory genes, especially those containing repeat sequences as mutation targets. In recent years, there has been a tremendous increase in the reported number of target genes whose mutations appear to be selected for in tumors with deficient MMR (Table 2). Some genes, such as the MMR genes MSH3 and MSH6 seem to be fairly commonly involved in microsatellite-unstable tumors of diverse origin (36), whereas others show considerable tissue specificity. For example, frameshift mutations in the TGFßRII (46) and TCF4 (39) genes are strongly selected for in gastrointestinal malignancies but not in endometrial cancer. Such tissue-specific selection may in part help explain the HNPCC tumor spectrum. Unusual manifestations (de novo neurofibromatosis type I, hematologic malignancies) in rare instances of homozygous MLH1 mutation carriers (47,48) provide further support to this model. Thus, a homozygous MMR gene mutation would generate constitutional genomic instability and downstream genes that by structure are most vulnerable (such as NF1) or those involved in rapidly proliferating cells (such as possible leukemia-associated genes) would determine the tissue specificity of the cancers and other associated disorders.
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As described above, MSI in sporadic colorectal cancer typically results from MLH1 inactivation that itself is part of a more primary defect, DNA methylation abnormality. Thus, MLH1 inactivation gives rise to MMR deficiency, which in turn induces secondary mutations in other growth-regulatory genes (Table 2). On the other hand, besides MLH1, other genes may be affected by aberrant DNA methylation, and these genes may be the same as or different from those susceptible to replication errors due to MMR deficiency. In individual tumors, several different mechanisms might therefore drive the tumorigenic process. For example, the APC gene, the ‘gatekeeper’ of cellular proliferation, may be inactivated in colon tumors by loss of heterozygosity (49), somatic mutations (50) or, as recently shown, by promoter hypermethylation (51,52). Loss of heterozygosity would be characteristic of a postulated ‘chromosomal instability’ pathway (53), somatic mutations would represent a microsatellite instability pathway and promoter hypermethylation would indicate yet another mechanism of tumorigenesis. Interestingly, Esteller et al. (21) found that APC promoter hypermethylation was not more common in microsatellite-unstable than in microsatellite-stable tumors, which together with other observations by Toyota et al. (54) emphasizes that DNA methylation abnormality and MSI may indeed operate independently.
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HNPCC—NOT A MERE MMR DEFICIENCY SYNDROME |
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TOPABSTRACTDNA MISMATCH REPAIRHEREDITARY NON-POLYPOSIS COLON...SPORADIC COLON CANCERS WITH...TUMORIGENESIS IN THE CONTEXT...HNPCC—NOT A MERE MMR...NON-POLYPOTIC COLON CANCER...REFERENCES |
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More and more evidence is accumulating to indicate that the MMR system does not only function in post-replication repair but is directly or indirectly linked to several other essential biologic processes. Combining genetic information of HNPCC families, biochemical studies of MMR, and knowledge of other cellular functions of MMR may be helpful to establish genotype–phenotype correlations in HNPCC. It has been known for some time that there is a connection between the MMR system and G2/M cell cycle checkpoint (55). It was recently shown that MMR gene mutation carriers who additionally have a variant form of cyclin D1 that is involved in G1/S control display a significantly lower age at onset of colon cancer than MMR gene mutation carriers without this variant (56). The variant form with a longer half-life may allow cells containing replication errors to pass through the G1/S checkpoint and proliferate instead of undergoing apoptosis; alternatively, a direct or indirect connection might exist between cyclin D1 and the MMR pathway (56).
Apart from biosynthetic errors, several other types of endogenous or exogenous DNA damage can serve as substrates for MMR proteins. For example, the MMR system can act on damage caused by heterocyclic amines (57), many of which are of dietary origin and therefore relevant to colon cancer. Enzymes that metabolize these compounds, including the N-acetyltransferases 1 and 2, show polymorphic variation and, like cyclin D1, may modify the clinical phenotype of HNPCC (58,59). The MMR proteins also recognize and eliminate oxidative damage (60,61). Such damage may arise through the action of the cyclo-oxygenase 2 (COX2) enzyme whose expression levels are often elevated in inflammatory processes and cancer. COX2 inhibitors are presently being tested in international multicenter trials for their possible ability to reduce polyp formation in HNPCC (62). Even before the identification of human MMR genes, resistance to alkylating agents was described as a feature of MMR-deficient cells (reviewed in 63). Since then, the role of the MMR machinery in the correction of alkylation-induced DNA damage has aroused particular interest and has recently revealed interesting links to apoptosis. Among alkylation-derived base adducts, O6-methylguanine is one of the most cytotoxic and normally triggers a damage-signaling cascade that can lead to G2/M arrest or cell death; this requires a functional MMR system and demonstrates variable dependence on p53 (64,65). MMR-deficient cells fail to induce apoptosis and are therefore alkylation-tolerant. Mouse studies suggest that the persistence of mutagenic lesions generated by chemical DNA damage may be an important factor contributing to the HNPCC tumor spectrum (66).
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NON-POLYPOTIC COLON CANCER FAMILIES WITHOUT DEMONSTRABLE MMR GENE MUTATIONS |
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TOPABSTRACTDNA MISMATCH REPAIRHEREDITARY NON-POLYPOSIS COLON...SPORADIC COLON CANCERS WITH...TUMORIGENESIS IN THE CONTEXT...HNPCC—NOT A MERE MMR...NON-POLYPOTIC COLON CANCER...REFERENCES |
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Altogether, approximately two-thirds of all clinically typical HNPCC families that meet the Amsterdam criteria I and show MSI in tumor tissue display germline mutations in the MMR genes shown in Table 1. This leaves one-third of such families molecularly unexplained. Some MMR gene alterations (especially in MLH1) consist of reduced mRNA or protein expression without demonstrable structural changes. The detection of even such alterations is possible with new techniques that allow the separation of the two parental homologues in monochromosomal hybrids (14). Although these new techniques are anticipated to reduce the molecularly unexplained fraction of HNPCC, linkage analyses (22,67) suggest that such non-polypotic colon cancer families exist that do not involve the presently known HNPCC loci and may therefore harbor novel predisposition genes. Table 3 shows examples of genes and mapped loci that may be associated with clinical phenotypes indistinguishable from HNPCC but without MSI in tumor tissue. Altogether, the nature of predisposition is yet to be discovered in a majority of familial aggregations of colon cancer (75) offering important challenges for future genetic research.
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ACKNOWLEDGEMENTS |
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The author’s research receives grant support from the Sigrid Juselius Foundation, the Academy of Finland, the Ohio Cancer Research Associates and the National Institutes of Health (CA67941, CA82282, P30 CA16058).
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FOOTNOTES |
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+ Tel: +1 614 688 4493; Fax: +1 614 688 4245; Email: peltomaki-1@medctr.osu.edu
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REFERENCES |
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TOPABSTRACTDNA MISMATCH REPAIRHEREDITARY NON-POLYPOSIS COLON...SPORADIC COLON CANCERS WITH...TUMORIGENESIS IN THE CONTEXT...HNPCC—NOT A MERE MMR...NON-POLYPOTIC COLON CANCER...REFERENCES |
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1 Kolodner, R.D. and Marsischky, G.T. (1999) Eukaryotic mismatch repair. Curr. Opin. Genet. Dev., 9, 89–96.[ISI][Medline]
2 Buermeyer, A.B., Deschenes, S.M., Baker, S.M. and Liskay, R.M. (1999) Mammalian DNA mismatch repair. Annu. Rev. Genet., 33, 533–564.[ISI][Medline]
3 Jiricny, J. and Nyström-Lahti, M. (2000) Mismatch repair defects in cancer. Curr. Opin. Genet. Dev., 10, 157–161.[ISI][Medline]
4 Marsischky, G.T., Filosi, N., Kane, M.F. and Kolodner, R. (1996) Redundancy of Saccharomyces cerevisiae MSH3 and MSH6 in MSH2-dependent mismatch repair. Genes Dev., 10, 407–420.
5 Das Gupta, R. and Kolodner, R.D. (2000) Novel dominant mutations in Saccharomyces cerevisiae MSH6. Nature Genet., 24, 53–56.[ISI][Medline]
6 Lipkin, S.M., Wang, V., Jacoby, R., Banerjee-Basu, S., Baxevanis, A.D., Lynch, H.T., Elliott, R.M. and Collins, F.S. (2000) MLH3: a DNA mismatch repair gene associated with mammalian microsatellite instability. Nature Genet., 24, 27–35.[ISI][Medline]
7 Räschle, M., Marra, G., Nyström-Lahti, M., Schar, P. and Jiricny, J. (1999) Identification of hMutLß, a heterodimer of hMLH1 and hPMS1. J. Biol. Chem., 5, 32368–32375.
8 Leung, W.K., Kim, J.J., Wu, L., Sepulveda, J.L. and Sepulveda, A. (2000) Identification of a second MutL DNA mismatch repair complex (hPMS1 and hMLH1) in human epithelial cells. J. Biol. Chem., 275, 15728–15732.
9 Lynch, H.T. and de la Chapelle, A. (1999) Genetic susceptibility to non-polyposis colorectal cancer. J. Med. Genet., 36, 801–818.
10 Vasen, H.F.A., Mecklin, J.-P., Meera Khan, P. and Lynch, H.T. (1991). The International Collaborative Group on hereditary non-polyposis colorectal cancer (ICG-HNPCC). Dis. Colon Rectum, 34, 424–425.[ISI][Medline]
11 Vasen, H.F.A., Watson, P., Mecklin, J.-P., Lynch, H.T. and The International Collaborative Group on HNPCC (1999) New clinical criteria for HNPCC (Lynch syndrome) proposed by the International Collaborative Group on HNPCC. Gastroenterology, 116, 1453–1456.[Medline]
12 Warthin, A.S. (1913) Heredity with reference to carcinoma. Arch. Intern. Med., 12, 546–555.[ISI]
13 Peltomäki, P., Aaltonen, L.A., Sistonen, P., Pylkkänen, L., Mecklin, J.-P., Järvinen, H., Green, J.S., Jass, J.R., Weber, J.L., Leach, F.S. et al. (1993) Genetic mapping of a locus predisposing to human colorectal cancer. Science, 260, 810–812.
14 Yan, H., Papadopoulos, N., Marra, G., Perrera, C., Jiricny, J., Boland, C.R., Lynch, H.T., Chadwick, R.B., de la Chapelle, A., Berg, K. et al. (2000) Conversion of diploidy to haploidy. Nature, 403, 723–724.[Medline]
15 Peltomäki, P., Vasen, H.F.A. and the International Collaborative Group on HNPCC (1997) Mutations predisposing to hereditary nonpolyposis colorectal cancer: database and results of a collaborative study. Gastroenterology, 113, 1146–1158.[ISI][Medline]
16 Boland, C.R., Thibodeau, S.N., Hamilton, S.R., Sidransky, D., Eshleman, J.R., Burt, R.W., Meltzer, S.J., Rodriguez-Bigas, M.A., Fodde, R., Ranzani, G.N. and Srivastava, S. (1998) A National Cancer Institute workshop on microsatellite instability for cancer detection and familial predisposition: Development of international criteria for the determination of microsatellite instability in colorectal cancer. Cancer Res., 58, 5248–5257.
17 Akiyama, Y., Sato, H., Yamada, T., Nagasaki, H., Tsuchiya, A., Abe, R. and Yuasa, Y. (1997) Germ-line mutation of the hMSH6/GTBP gene in an atypical hereditary nonpolyposis colorectal cancer kindred. Cancer Res., 57, 3920–3923.
18 Miyaki, M., Konishi, M., Tanaka, K., Kikuchi-Yanoshita, R., Muraoka, M., Yasuno, M., Igari, T., Koike, M., Chiba, M. and Mori, T. (1997) Germline mutation of MSH6 as the cause of hereditary nonpolyposis colorectal cancer. Nature Genet., 17, 271–272.[ISI][Medline]
19 Wijnen, J., de Leeuw, W., Vasen, H., van der Klift, H., Møller, P., Stormorken, A., Meijers-Heijboer, H., Lindhout, D., Menko, F., Vossen, S. et al. (1999) Familial endometrial cancer in female carriers of MSH6 germline mutations. Nature Genet., 23, 142–144.[ISI][Medline]
20 Kolodner, R.D., Tytell, J.D., Schmeits, J.L., Kane, M.F., Gupta, R.D., Weger, J., Wahlberg, S., Fox, E.A., Peel, D., Ziogas, A. et al. (1999) Germ-line msh6 mutations in colorectal cancer families. Cancer Res., 59, 5068–5074.
21 Wu, Y., Berends, M.J.W., Mensink, R.G.J., Kempinga, C., Sijmons, R.H., van der Zee, A.G.J., Hollema, H., Kleibeuker, J.H., Buys, C.H.C.M. and Hofstra, R.M.W. (1999) Association of hereditary nonpolyposis colorectal cancer-related tumors displaying low microsatellite instability with MSH6 germline mutations. Am. J. Hum. Genet., 65, 1291–1298.[ISI][Medline]
22 Huang, J., Kuismanen, S.A., Liu, T., Chadwick, R.B., Johnson, C.K., Stevens, M.W., Richards, S.K., Meek, J.E., Gao, X., Wright, F.A. et al. (2001) MSH6 and MSH3 are rarely involved in genetic predisposition to non-polypotic colon cancer. Cancer Res., in press.
23 Wu, Y., Berends, M.J.W., Mensink, R.G.J., Verlind, E., Sijmons, R.H., van der Zee, A.G.J., Hollema, H., Kleibeuker, J.H., Buys, C.H.C.M. and Hofstra, R.M.W. (2000) Germline hMLH3 mutations in patients with suspected HNPCC. Am. J. Hum. Genet., 67, 17.
24 Lynch, H.T. and Smyrk, T. (1996) Hereditary nonpolyposis colorectal cancer (Lynch syndrome): an updated review. Cancer, 78, 1149–1167.[ISI][Medline]
25 Kuismanen, S.A., Holmberg, M.T., Salovaara, R., de la Chapelle, A. and Peltomäki, P. (2000) Genetic and epigenetic modification of MLH1 accounts for a major share of microsatellite-unstable colorectal cancers. Am. J. Pathol., 156, 1773–1779.
26 Veigl, M.L., Kasturi, L., Olechnowicz, J., Ma, A.H., Lutterbaugh, J.D., Periyasamy, S., Li, G.-M., Drummond, J., Modrich, P., Sedwick, W.D. and Markowitz, S.D. (1998) Biallelic inactivation of hMLH1 by epigenetic silencing, a novel mechanism causing human MSI cancers. Proc. Natl Acad. Sci. USA, 95, 8698–8702.
27 Toyota, M., Ahuja, N., Ohe-Toyota, M., Herman, J.G., Baylin, S.B. and Issa, J.-P. (1999) CpG island methylation phenotype in colorectal cancer. Proc. Natl Acad. Sci. USA, 96, 8681–8686.
28 Pao, M.M., Liang, G., Tsai, Y.C., Xiong, Z., Laird, P.W. and Jones, P.A. (2000) DNA methylator and mismatch repair phenotypes are not mutually exclusive in colorectal cancer cell lines. Oncogene, 19, 943–952.[ISI][Medline]
29 Thibodeau, S.N., French, A.J., Cunningham, J.M., Tester, D., Burgart, L.J., Roche, P.C., McDonnell, S.K., Schaid, D.J., Vockley, C.W., Michels, V.V. et al. (1998) Microsatellite instability in colorectal cancer: different mutator phenotypes and the principal involvement of hMLH1. Cancer Res., 58, 1713–1718.
30 Percesepe, A., Kristo, P., Aaltonen, L.A., Ponz de Leon, M., de la Chapelle, A. and Peltomäki, P. (1998) Mismatch repair genes and mononucleotide tracts as mutation targets in colorectal tumors with different degrees of microsatellite instability. Oncogene, 17, 157–163.[ISI][Medline]
31 Jass, J.R., Iino, H., Ruszkiewicz, A., Painter, D., Solomon, M.J., Koorey, D.J., Cohn, D., Furlong, K.L., Walsh, M.D., Palazzo, J. et al. (2000) Neoplastic progression occurs through mutator pathways in hyperplastic polyposis of the colorectum. Gut, 47, 43–49.
32 Parsons, R., Li, G.M., Longley, M.J., Fang, W.H., Papadopoulos, N., Jen, J., de la Chapelle, A., Kinzler, K.W., Vogelstein, B. and Modrich, P. (1993) Hypermutability and mismatch repair deficiency in RER+ tumor cells. Cell, 75, 1227–1236.[ISI][Medline]
33 Bhattacharyya, N.P., Skandalis, A., Ganesh, A., Groden, J. and Meuth, M. (1994) Mutator phenotypes in human colorectal carcinoma cell lines. Proc. Natl Acad. Sci. USA, 91, 6319–6323.
34 Markowitz, S., Wang, J., Myeroff, L., Parsons, R., Sun, L., Lutterbaugh, J., Fan, R.S., Zborowska, E., Kinzlein, K.W., Vogelstein, B. et al. (1995) Inactivation of the type II TGF-ß receptor in colon cancer cells with microsatellite instability. Science, 268, 1336–1338.
35 Parsons, R., Myeroff, L., Liu, B., Willson, J., Markowitz, S., Kinzler, K. and Vogelstein, B. (1995) Microsatellite instability and mutations of the transforming growth factor ß type II receptor gene in colorectal cancer. Cancer Res., 55, 5548–5550.
36 Malkhosyan, S., Rampino, N., Yamamoto, H. and Perucho, M. (1996) Frameshift mutator mutations. Nature, 382, 499–500.[Medline]
37 Souza, R.F., Appel, R., Yin, J., Wang, S., Smolinski, K.N., Abraham, J.M., Zou, T.T., Shi, Y.-Q., Lei, J., Cottrell, J. et al. (1996) The insulin-like growth factor II receptor gene is a target of microsatellite instability in human gastrointestinal tumours. Nature Genet., 14, 255–257.[ISI][Medline]
38 Rampino, N., Yamamoto, H., Ionov, Y., Li, Y., Sawai, H., Reed, J.C. and Perucho, M. (1997) Somatic frameshift mutations in the BAX gene in colon cancers of the microsatellite mutator phenotype. Science, 275, 967–969.
39 Duval, A., Iacopetta, B., Ranzani, G.N., Lothe, R.A., Thomas, G. and Hamelin, R. (1999) Variable mutation frequencies in coding repeats of TCF-4 and other target genes in colon, gastric and endometrial carcinoma showing microsatellite instability. Oncogene, 18, 6806–6809.[ISI][Medline]
40 Bader, S., Walker, M., Hendrich, B., Bird, A., Bird, C., Hooper, M. and Wyllie, A. (1999) Somatic frameshift mutations in the MBD4 gene of sporadic colon cancers with mismatch repair deficiency. Oncogene, 18, 8044–8047.[ISI][Medline]
41 Riccio, A., Aaltonen, L.A., Godwin, A.K., Loukola, A., Percesepe, A., Salovaara, R., Masciullo, V., Genuardi, M., Paravatou-Petsotas, M., Bassi, D.E. et al. (1999) The DNA repair gene MBD4 (MED1) is mutated in human carcinomas with microsatellite instability. Nature Genet., 23, 266–268.[ISI][Medline]
42 Guanti, G., Resta, N., Simone, C., Cariola, F., Demma, I., Fiorente, P. and Gentile, M. (2000) Involvement of PTEN mutations in the genetic pathways of colorectal cancerogenesis. Hum. Mol. Genet., 9, 283–287.
43 Chadwick, R.B., Jiang, G.-L., Bennington, G.A., Yuan, B., Johnson, C.K., Stevens, M.W., Niemann, T.H., Peltomäki, P., Huang, S. and de la Chapelle, A. (2000) Candidate tumor suppressor RIZ is frequently involved in colorectal carcinogenesis. Proc. Natl Acad. Sci. USA, 97, 2662–2667.
44 Piao, Z., Fang, W., Malkhosyan, S., Kim, H., Horii, A., Perucho, M. and Huang, S. (2000) Frequent frameshift mutations of RIZ in sporadic gastrointestinal and endometrial carcinomas with microsatellite instability. Cancer Res., 60, 4701–4704.
45 Liu, W., Dong, X., Mai, M., Seelan, R.S., Taniguchi, K., Krishnadath, K.K., Halling, K.C., Cunningham, J.M., Qian, C., Christensen, E. et al. (2000) Mutations in AXIN2 cause colorectal cancer with defective mismatch repair by activating ß-catenin/TCF signaling. Nature Genet., 26, 146–147.[ISI][Medline]
46 Myeroff, L.L., Parsons, R., Kim, S.-J., Hedrick, L., Cho, K.R., Orth, K., Mathis, M., Kinzler, K.W., Lutterbaugh, J., Park, K. et al. (1995) A transforming growth factor ß receptor type II gene mutation common in colon and gastric but rare in endometrial cancers. Cancer Res., 55, 5545–5547.
47 Ricciardone, M.D., Özcelik, T., Cevher, B., Özdag, H., Tuncer, M., Gürgey, A., Uzunalimoglu, Ö., Çetinkaya, H, Tanyeli, A., Erken, E. and Özturk, M. (1999) Human MLH1 deficiency predisposes to hematological malignancy and neurofibromatosis type I. Cancer Res., 59, 290–293.
48 Wang, Q., Lasset, C., Desseigne, F., Frappaz, D., Bergeron, C., Navarro, C., Ruano, E. and Puisieux, A. (1999) Neurofibromatosis and early onset of cancers in hMLH1-deficient children. Cancer Res., 59, 294–297.
49 Fearon, E.R. and Vogelstein, B. (1990) A genetic model for colorectal tumorigenesis. Cell, 61, 759–767. [ISI][Medline]
50 Miyoshi, Y., Nagase, H., Ando, H., Horii, A., Ichii, S., Nakatsuru, S., Aoki, T., Miki, Y., Mori, T. and Nakamura, Y. (1992) Somatic mutations of the APC gene in colorectal tumors: mutation cluster region in the APC gene. Hum. Mol. Genet., 1, 229–233.
51 Hiltunen, M.O., Alhonen, L., Koistinaho, J., Myöhänen, S., Pääkkönen, M., Marin, S., Kosma, V.-M. and Jänne, J. (1997) Hypermethylation of the APC (Adenomatous polyposis coli) gene promoter region in human colorectal carcinoma. Int. J. Cancer, 70, 644–648.[ISI][Medline]
52 Esteller, M., Sparks, A., Toyota, M., Sanchez-Cespedes, M., Capella, G., Peinado, M.A., Gonzalez, S., Tarafa, G., Sidransky, D., Meltzer, S.J. et al. (2000) Analysis of adenomatous polyposis coli promoter hypermethylation in human cancer. Cancer Res., 60, 4366–4371.
53 Lengauer, C., Kinzler, K.W. and Vogelstein, B. (1998) Genetic instabilities in human cancers. Nature, 396, 643–649.[Medline]
54 Toyota, M., Ohe-Toyota, M., Ahuja, N. and Issa, J.-P. (2000) Distinct genetic profiles in colorectal tumors with or without the CpG island methylator phenotype. Proc. Natl Acad. Sci. USA, 18, 710–715.
55 Hawn, M.T., Umar, A., Carethers, J.M., Marra, G., Kunkel, T.A., Boland, C.R. and Koi, M. (1995) Evidence for a connection between the mismatch repair system and the G2 cell cycle checkpoint. Cancer Res., 55, 3721–3725.
56 Kong, S., Amos, C.I., Luthra, R., Lynch, P.M., Levin, B. and Frazier, M.L. (2000) Effects of cyclin D1 polymorphism on age of onset of hereditary nonpolyposis colorectal cancer. Cancer Res., 60, 249–252.
57 Li, G.-M., Wang, H. and Romano, L.J. (1996) Human MutS specifically binds to DNA containing aminofluorene and acetylaminofluorene adducts. J. Biol. Chem., 271, 24084–24088.
58 Moisio, A.-L., Sistonen, P., Mecklin, J.-P., Järvinen, H. and Peltomäki, P. (1998) Genetic polymorphisms in carcinogen metabolism and their association to hereditary non-polyposis colon cancer. Gastroenterology, 115, 1387–1394.[ISI][Medline]
59 Heinimann, K., Scott, R.J., Chappuis, P., Weber, W., Muller, H., Dobbie, Z. and Hutter, P. (1999) N-acetyltransferase 2 influences cancer prevalence in hMLH1/hMSH2 mutation carriers. Cancer Res., 59, 3038–3040.
60 deWeese, T.L., Shipman, J.M., Larrier, N.A., Buckley, N.M., Kidd, L.C.R., Groopman, J.D., Cutler, R.G., te Riele, H. and Nelson, W.G. (1998) Mouse embryonic stem cells carrying one or two defective Msh2 alleles respond abnormally to oxidative stress inflicted by low-level radiation. Proc. Natl Acad. Sci. USA, 95, 11915–11920.
61 Jackson, A.L., Chen, R. and Loeb, L. (1998) Induction of microsatellite instability by oxidative DNA damage. Proc. Natl Acad. Sci. USA, 95, 12468–12473.
62 Rüschoff, J., Wallinger, S., Dietmaier, W., Bocker, T., Brockhoff, G., Hofstädter, F. and Fishel, R. (1998) Aspirin suppresses the mutator phenotype associated with hereditary nonpolyposis colorectal cancer by genetic selection. Proc. Natl Acad. Sci. USA, 95, 11301–11306.
63 Karran, P. and Hampson, R. (1996) Genomic instability and tolerance to alkylating agents. Cancer Surv., 28, 69–85.[ISI][Medline]
64 Duckett, D.R., Bronstein, S.M., Taya, Y. and Modrich, P. (1999) hMutS and hMutL-dependent phosphorylation of p53 in response to DNA methylator damage. Proc. Natl Acad. Sci. USA, 96, 12384–12388.
65 Hickman, M.J. and Samson, L.D. (1999) Role of DNA mismatch repair and p53 in signaling induction of apoptosis by alkylating agents. Proc. Natl Acad. Sci. USA, 96, 10764–10769.
66 de Wind, N., Dekker, M., van Rossum, A., van der Valk, M. and te Riele, H. (1998) Mouse models for hereditary nonpolyposis colorectal cancer. Cancer Res., 58, 248–255.
67 Lewis, C.M., Neuhausen, S.L., Daley, D., Black, F.J., Swensen, J., Burt, R.W., Cannon-Albright, L.A. and Skolnick, M.H. (1996) Genetic heterogeneity and unmapped genes for colorectal cancer. Cancer Res., 56, 1382–1388.
68 Lu, S.-L., Kawabata, M., Imamura, T., Akiyama, Y., Nomizu, T., Miyazono, K. and Yuasa, Y. (1998) HNPCC associated with germline mutation in the TGF-ß type II receptor gene. Nature Genet., 19, 17–18.[ISI][Medline]
69 Richards, F.M., McKee, S.A., Rajpar, M.H., Cole, T.R.P., Evand, D.G.R., Jankowski, J.A., McKeown, C., Sanders, D.S.A. and Maher, E.R. (1999) Germline E-cadherin gene CHD1 mutations predispose to familial gastric cancer and colorectal cancer. Hum. Mol. Genet., 8, 607–610.
70 Laken, S.J., Petersen, G.M., Gruber, S.B., Oddoux, C., Ostrer, H., Giardiello, F.M., Hamilton, S.R., Hampel, H., Markowitz, A., Klimstra, D. et al. (1997) Familial colorectal cancer in Ashkenazim due to a hypermutable tract in APC. Nature Genet., 17, 79–83.[ISI][Medline]
71 Prior, T.W., Chadwick, R.B., Papp, A.C., Arcot, A.N., Isa, A.M., Pearl, D.K., Stemmermann, G., Percesepe, A., Loukola, A., Aaltonen, L.A. and de la Chapelle, A. (1999) The I1307K polymorphism of the APC gene in colorectal cancer. Gastroenterology, 116, 58–63.[ISI][Medline]
72 Frayling, I.M., Beck, N.E., Ilyas, M., Dove-Edwin, I., Goodman, P., Pack, K., Bell, J.A., Williams, C.B., Hodgson, S.V., Thomas, H.J.W. et al. (1998) The APC variants I1307K and E1317Q are associated with colorectal tumors, but not always with a family history. Proc. Natl Acad. Sci. USA, 95, 10722–10727.
73 Thomas, H.J.W., Whitelaw, S.C., Cottrell, S.E., Murday, V.A., Tomlinson, I.P.M., Markie, D., Jones, T., Bishop, D.T., Hodgson, S.V., Sheer, D. et al. (1996) Genetic mapping of the hereditary mixed polyposis syndrome to chromosome 6q. Am. J. Hum. Genet., 58, 770–776.[ISI][Medline]
74 Tomlinson, I., Rahman, N., Frayling, I., Mangion, J., Barfoot, R., Hamoudi, R., Seal, S., Northover, J., Thomas, H.J.W., Neale, K. et al. (1999) Inherited susceptibility to colorectal adenomas and carcinomas: evidence for a new predisposition gene on 15q14-q22. Gastroenterology, 116, 789–795.[ISI][Medline]
75 Burt, R.W. (2000) Colon cancer screening. Gastroenterology, 119, 837–853.[ISI][Medline]
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