title: MicroRNAs in hereditary diffuse gastric cancer.
abstract: In 2012, gastric cancer (GC) was the third cause of mortality due to cancer in men and women. In Central and South America, high mortality rates have been reported. A total of 95% of tumors developed in the stomach are of epithelial origin; thus, these are denominated adenocarcinomas of the stomach. Diverse classification systems have been established, among which two types of GC based on histological type and growth pattern have been described as follows: Intestinal (IGC) and diffuse (DGC). Approximately 1-3% of GC cases are associated with heredity. Hereditary-DGC (HDGC), with 80% penetrance, is an autosomal-type, dominant syndrome in which 40% of cases are carriers of diverse mutations of theCDH1gene, which encodes for the cadherin protein. By contrast, microRNA are non-encoded, single-chain RNA molecules. These molecules regulate the majority of cellular functions at the post-transcriptional level. However, analysis of these interactions by means of Systems Biology has allowed the understanding of complex and heterogeneous diseases, such as cancer. These molecules are ubiquitous; however, their expression can be specific in different tissues either temporarily or permanently, depending on the stage of the cell. Due to the participation of microRNA in the processes of cellular proliferation, cell cycle control, apoptosis, differentiation and metabolism, these have been indicated to have a role in the development of cancerous processes, finding specific patterns of expression in different neoplasms, including GC, in which the microRNA expression profile is different in samples of non-cancerous versus cancerous tissues. A difference has been observed in the expression patterns of DGC and IGC. However, the role of microRNA in HDGC has not yet been established. The present study reviews the investigations that describe the participation of microRNA in the regulation of genesCDH1,RHOA,CTNNA1,INSRandTGF-β in different neoplasms, such as HDGC.
authors.affiliation: Medical Research Unit in Human Genetics, Hospital of Pediatrics, National Medical Center XXI Century, Mexican Social Security Institute, Mexico City 06720, Mexico; Department of Microbiology, National School of Biological Sciences, National Polytechnic Institute, Mexico City 11340, Mexico.
authors.forename: Mayra-Cecilia
authors.initials: MC
authors.lastname: Suárez-Arriaga
authors.affiliation: Department of Microbiology, National School of Biological Sciences, National Polytechnic Institute, Mexico City 11340, Mexico.
authors.forename: Rosa-María
authors.initials: RM
authors.lastname: Ribas-Aparicio
authors.affiliation: Medical Research Unit in Human Genetics, Hospital of Pediatrics, National Medical Center XXI Century, Mexican Social Security Institute, Mexico City 06720, Mexico.
authors.forename: Martha-Eugenia
authors.initials: ME
authors.lastname: Ruiz-Tachiquín
keywords: hereditary diffuse gastric cancer; hsa-miR-9; hsa-miR-92; let-7 family; miR-200 family; microRNA