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lüll The restriction site mutation (RSM) method: clinical applications Jenkins GJMutagenesis 2004[Jan]; 19 (1): 3-11The restriction site mutation (RSM) method has been developed over the past 13 years as a sensitive mutation test which can detect mutations in restriction sites in any gene. Due to the fact that 5/8 of the main mutation hotspots in the TP53 gene fall within restriction sites, RSM can analyse them for the presence of rare mutations (1 mutation in 10000 non-mutated copies). After validating the usefulness of RSM in detecting mutagen-induced mutations, we recently turned our attention to looking for TP53 mutations in pre-malignant tissue. We show here that RSM can detect early TP53 mutations in pre-malignant tissue of the oesophagus, stomach, colon and bladder. We can also use these clinical mutation data to speculate as to the causative mutagens involved in these cancer conditions. We here use an example of mutations detected in gastric tissue and those induced in vitro by hydrogen peroxide.|*Mutation[MESH]|Colon/pathology/physiology[MESH]|DNA Restriction Enzymes/*genetics[MESH]|Digestive System/pathology[MESH]|Esophagus/pathology/physiology[MESH]|Humans[MESH]|Mutagenicity Tests/*methods[MESH]|Neoplasms/genetics[MESH]|Precancerous Conditions[MESH]|Predictive Value of Tests[MESH]|Tumor Suppressor Protein p53/*genetics[MESH]|Urinary Bladder/pathology/physiology[MESH] |