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Carcinogenesis and microsatellite instability: the interrelationship between genetics and epigenetics Imai K; Yamamoto HCarcinogenesis 2008[Apr]; 29 (4): 673-80DNA mismatch repair (MMR) deficiency results in a strong mutator phenotype and high-frequency microsatellite instability (MSI-H), which are the hallmarks of tumors arising within Lynch syndrome. MSI-H is characterized by length alterations within simple repeated sequences, microsatellites. Lynch syndrome is primarily due to germline mutations in one of the DNA MMR genes; mainly hMLH1 or hMSH2 and less frequently hMSH6 and rarely hPMS2. Germline hemiallelic methylation of MLH1, termed epimutation, has been reported to be a new cause of Lynch syndrome. MSI-H is also observed in approximately 15% of colorectal, gastric and endometrial cancers and in lower frequencies in a minority of other tumors, where it is associated with the hypermethylation of the promoter region of hMLH1. MSI-H underlies a distinctive tumorigenic pathway because cancers with MSI-H exhibit many differences in genotype and phenotype relative to cancers without MSI-H, irrespective of their hereditary or sporadic origins. Genetic, epigenetic and transcriptomic differences exist between cancers with and those without the MSI-H. The BRAF V600E mutation is associated with sporadic MSI-H colorectal cancers (CRCs) harboring hMLH1 methylation but not Lynch syndrome-related CRCs. The differences in genotype and phenotype between cancers with and those without MSI-H are likely to be causally linked to their differences in biological and clinical features. Therefore, the diagnosis of MSI-H in cancers is thus considered to be of increasing relevance, because MSI-H is a useful screening marker for identifying patients with Lynch syndrome, a better prognostic factor and could affect the efficacy of chemotherapy. This review addresses recent advances in the field of microsatellite instability research.|*Microsatellite Instability[MESH]|Colorectal Neoplasms, Hereditary Nonpolyposis/drug therapy/genetics[MESH]|Colorectal Neoplasms/drug therapy/genetics[MESH]|DNA Methylation[MESH]|DNA Mismatch Repair[MESH]|Epigenesis, Genetic/*genetics[MESH]|Gene Frequency[MESH]|Germ-Line Mutation[MESH]|Humans[MESH]|Models, Genetic[MESH]|Neoplasms/*genetics[MESH]|Prognosis[MESH] |
