title: Genetics of hereditary nonpolyposis colorectal cancer.
abstract: Colorectal cancer is a major cause of morbidity and mortality. About 15 - 20% of all colorectal cancers are familial. Hereditary nonpolyposis colorectal cancer is an inherited cancer predisposition syndrome. It is caused by mutations in mismatch repair genes, predominantly MSH2 and MLH1. Although hereditary nonpolyposis colorectal cancer accounts for a minority of colorectal cancers, the mutations identified in these cases are important in our understanding of colorectal cancer pathogenesis. An increasing number of deletions in different exons of MSH2 and MLH1 genes is reported to result in hereditary nonpolyposis colorectal cancer. This paper reviews the genetics behind these genes and molecular study of the hereditary nonpolyposis colorectal cancer. This may help the medical professionals especially internists, gastroenterologists, and oncologists to update their knowledge in this field.
authors.affiliation: Department of Medical Genetics, Endocrinology and Metabolism Research Center (EMRC), Tehran University of Medical Sciences, Tehran, Iran. akramism@tums.ac.ir
authors.forename: Seyed Mohammad
authors.initials: SM
authors.lastname: Akrami
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology; D020137:Base Pair Mismatch; D002352:Carrier Proteins / Q000235:genetics; D015179:Colorectal Neoplasms / Q000175:diagnosis / Q000235:genetics*; D003123:Colorectal Neoplasms, Hereditary Nonpolyposis / Q000175:diagnosis / Q000235:genetics*; D004260:DNA Repair; D005091:Exons; D017353:Gene Deletion; D020022:Genetic Predisposition to Disease; D016678:Genome; D006801:Humans; D018895:Microsatellite Repeats; D008957:Models, Genetic; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein / Q000235:genetics; D009154:Mutation; D009687:Nuclear Proteins / Q000235:genetics
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D000894:Anti-Inflammatory Agents, Non-Steroidal; D002352:Carrier Proteins; C501486:MLH1 protein, human; D009687:Nuclear Proteins; C497172:MSH2 protein, human; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein