title: [Breast cancer genetics. BRCA1 and BRCA2: the main genes for disease predisposition].
abstract: Breast cancer is among the most common world cancers. In Mexico this neoplasm has been progressively increasing since 1990 and is expected to continue. The risk factors for this disease are age, some reproductive factors, ionizing radiation, contraceptives, obesity and high fat diets, among other factors. The main risk factor for BC is a positive family history. Several families, in which clustering but no mendelian inheritance exists, the BC is due probably to mutations in low penetrance genes and/or environmental factors. In families with autosomal dominant trait, the BRCA1 and BRCA2 genes are frequently mutated. These genes are the two main BC susceptibility genes. BRCA1 predispose to BC and ovarian cancer, while BRCA2 mutations predispose to BC in men and women. Both are long genes, tumor suppressors, functioning in a cell cycle dependent manner, and it is believed that both switch on the transcription of several genes, and participate in DNA repair. The mutations profile of these genes is known in developed countries, while in Latin America their search has just began. A multidisciplinary group most be responsible of the clinical management of patients with mutations in BRCA1 and BRCA2, and the risk assignment and Genetic counseling most be done carefully.
authors.affiliation: Laboratorio de Genética Molecular de la ULIEG, México.
authors.forename: P
authors.initials: P
authors.lastname: Ruiz-Flores
authors.forename: A L
authors.initials: AL
authors.lastname: Calderón-Garcidueñas
authors.forename: H A
authors.initials: HA
authors.lastname: Barrera-Saldaña
mesh_terms: D000328:Adult; D000368:Aged; D016588:Anticarcinogenic Agents / Q000627:therapeutic use; D024682:BRCA2 Protein; D001943:Breast Neoplasms / Q000453:epidemiology / Q000208:ethnology / Q000235:genetics* / Q000517:prevention & control; D018567:Breast Neoplasms, Male / Q000453:epidemiology / Q000235:genetics; D003278:Contraceptives, Oral, Hormonal / Q000009:adverse effects; D004252:DNA Mutational Analysis; D003906:Developing Countries; D004041:Dietary Fats / Q000009:adverse effects; D004992:Ethics, Medical; D005260:Female; D005787:Gene Frequency; D019398:Genes, BRCA1; D020022:Genetic Predisposition to Disease; D005820:Genetic Testing; D006801:Humans; D015994:Incidence; D007774:Lactation; D007843:Latin America / Q000453:epidemiology; D008297:Male; D008800:Mexico / Q000453:epidemiology; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000235:genetics*; D009369:Neoplasms / Q000453:epidemiology; D009381:Neoplasms, Radiation-Induced / Q000453:epidemiology; D009765:Obesity / Q000453:epidemiology; D010051:Ovarian Neoplasms / Q000235:genetics; D017584:Reproductive History; D012307:Risk Factors; D020845:Selective Estrogen Receptor Modulators / Q000627:therapeutic use; D014157:Transcription Factors / Q000235:genetics*
chemical_list: D016588:Anticarcinogenic Agents; D024682:BRCA2 Protein; D003278:Contraceptives, Oral, Hormonal; D004041:Dietary Fats; D009363:Neoplasm Proteins; D020845:Selective Estrogen Receptor Modulators; D014157:Transcription Factors