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Paz-Y-Miño C, Yumiceba V, Moreta G, Paredes R, Ruiz M, Ocampo L, Llamos Paneque A, Ochoa Pérez C, Ruiz-Cabezas JC, Álvarez Vidal J, Jiménez Torres I, Vargas-Vera R, Cruz F, Guapi N VH, Montalván M, Meneses Álvarez S, Garzón Castro M, Lamar Segura E, Recalde Báez MA, Naranjo ME, Tambaco Jijón N, Sinche M, Licuy P, Burgos R, Porras-Borja F, Echeverría-Garcés G, Pérez-Villa A, Armendáriz-Castillo I, García-Cárdenas JM, Guerrero S, Guevara-Ramírez P, López-Cortés A, Zambrano AK, Leone PE. Multi-institutional experience of genetic diagnosis in Ecuador: National registry of chromosome alterations and polymorphisms. Mol Genet Genomic Med 2019; 8:e1087. [PMID: 31830383 PMCID: PMC7005643 DOI: 10.1002/mgg3.1087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 11/06/2019] [Accepted: 11/14/2019] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Detection of chromosomal abnormalities is crucial in various medical areas; to diagnose birth defects, genetic disorders, and infertility, among other complex phenotypes, in individuals across a wide range of ages. Hence, the present study wants to contribute to the knowledge of type and frequency of chromosomal alterations and polymorphisms in Ecuador. METHODS Cytogenetic registers from different Ecuadorian provinces have been merged and analyzed to construct an open-access national registry of chromosome alterations and polymorphisms. RESULTS Of 28,806 karyotypes analyzed, 6,008 (20.9%) exhibited alterations. Down syndrome was the most frequent autosome alteration (88.28%), followed by Turner syndrome (60.50%), a gonosome aneuploidy. A recurrent high percentage of Down syndrome mosaicism (7.45%) reported here, as well as by previous Ecuadorian preliminary registries, could be associated with geographic location and admixed ancestral composition. Translocations (2.46%) and polymorphisms (7.84%) were not as numerous as autosomopathies (64.33%) and gonosomopathies (25.37%). Complementary to conventional cytogenetics tests, molecular tools have allowed identification of submicroscopic alterations regions or candidate genes which can be possibly implicated in patients' symptoms and phenotypes. CONCLUSION The Ecuadorian National Registry of Chromosome Alterations and Polymorphisms provides a baseline to better understand chromosomal abnormalities in Ecuador and therefore their clinical management and awareness. This data will guide public policy makers to promote and financially support cytogenetic and genetic testing.
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Affiliation(s)
- César Paz-Y-Miño
- Centro de Investigación Genética y Genómica, Facultad de Ciencias de la Salud Eugenio Espejo, Universidad UTE, Quito, Ecuador
| | - Verónica Yumiceba
- Centro de Investigación Genética y Genómica, Facultad de Ciencias de la Salud Eugenio Espejo, Universidad UTE, Quito, Ecuador
| | - Germania Moreta
- Servicio de Genética Médica, Hospital de Especialidades, Quito, Ecuador
| | - Rosario Paredes
- Servicio de Genética Médica, Hospital de Especialidades, Quito, Ecuador
| | | | - Ligia Ocampo
- Laboratorio de Genética, Génica Laboratorios, Quito, Ecuador
| | | | | | - Juan Carlos Ruiz-Cabezas
- Hospital "Dr. Juan Tanca Marengo", SOLCA Matriz, Guayaquil, Ecuador.,Facultad de Medicina, Universidad Espíritu Santo, Guayaquil, Ecuador
| | - Jenny Álvarez Vidal
- Centro de Diagnóstico y Estudios Biomédicos, Facultad de Ciencia Médicas, Universidad de Cuenca, Cuenca, Ecuador
| | | | - Ramón Vargas-Vera
- Facultad de Ciencias Médicas, Universidad de Guayaquil, Guayaquil, Ecuador
| | - Fernando Cruz
- Centro de Genética Médica, CEGEMED, Ministerio de Salud Pública, Quito, Ecuador
| | - Víctor Hugo Guapi N
- Hospital General Provincial "Luis G. Dávila", Ministerio de Salud Pública, Tulcán, Ecuador
| | - Martha Montalván
- Centro de Investigaciones, Universidad Espíritu Santo, Guayaquil, Ecuador
| | | | | | | | | | | | | | - María Sinche
- Hospital "Dr. Juan Tanca Marengo", SOLCA Matriz, Guayaquil, Ecuador
| | - Pedro Licuy
- Hospital "Dr. Juan Tanca Marengo", SOLCA Matriz, Guayaquil, Ecuador
| | - Ramiro Burgos
- Hospital "Dr. Juan Tanca Marengo", SOLCA Matriz, Guayaquil, Ecuador
| | - Fabián Porras-Borja
- Centro de Genética Médica, CEGEMED, Ministerio de Salud Pública, Quito, Ecuador
| | | | - Andy Pérez-Villa
- Centro de Investigación Genética y Genómica, Facultad de Ciencias de la Salud Eugenio Espejo, Universidad UTE, Quito, Ecuador
| | - Isaac Armendáriz-Castillo
- Centro de Investigación Genética y Genómica, Facultad de Ciencias de la Salud Eugenio Espejo, Universidad UTE, Quito, Ecuador
| | - Jennyfer M García-Cárdenas
- Centro de Investigación Genética y Genómica, Facultad de Ciencias de la Salud Eugenio Espejo, Universidad UTE, Quito, Ecuador
| | - Santiago Guerrero
- Centro de Investigación Genética y Genómica, Facultad de Ciencias de la Salud Eugenio Espejo, Universidad UTE, Quito, Ecuador
| | - Patricia Guevara-Ramírez
- Centro de Investigación Genética y Genómica, Facultad de Ciencias de la Salud Eugenio Espejo, Universidad UTE, Quito, Ecuador
| | - Andrés López-Cortés
- Centro de Investigación Genética y Genómica, Facultad de Ciencias de la Salud Eugenio Espejo, Universidad UTE, Quito, Ecuador
| | - Ana Karina Zambrano
- Centro de Investigación Genética y Genómica, Facultad de Ciencias de la Salud Eugenio Espejo, Universidad UTE, Quito, Ecuador
| | - Paola E Leone
- Centro de Investigación Genética y Genómica, Facultad de Ciencias de la Salud Eugenio Espejo, Universidad UTE, Quito, Ecuador
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