Identifier to cite or link to this item: http://hdl.handle.net/20.500.13003/11381
Molecular Testing for Fragile X: Analysis of 5062 Tests from 1105 Fragile X Families-Performed in 12 Clinical Laboratories in Spain
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AuthorTejada, Maria-Isabel; Glover, Guillermo; Martinez, Francisco; Guitart, Miriam; de Diego-Otero, Yolanda; Fernandez-Carvajal, Isabel; Ramos, Feliciano J.; Hernandez-Chico, Concepcion; Pintado, Elizabet; Rosell, Jordi; Calvo, Maria-Teresa; Ayuso, Carmen; Ramos-Arroyo, Maria-Antonia; Maortua, Hiart; Mila, Montserrat
Document typeresearch article
CitationTejada MI, Glover G, Martinez F, Guitart M, De Diego-Otero Y, Fernandez-Carvajal I, et al. Molecular Testing for Fragile X: Analysis of 5062 Tests from 1105 Fragile X Families-Performed in 12 Clinical Laboratories in Spain. Biomed Res Int. 2014;2014:195793. Epub 2014 May 28.
Fragile X syndrome is the most common inherited form of intellectual disability. Here we report on a study based on a collaborative registry, involving 12 Spanish centres, of molecular diagnostic tests in 1105 fragile X families comprising 5062 individuals, of whom, 1655 carried a full mutation or were mosaic, three cases had deletions, 1840 had a premutation, and 102 had intermediate alleles. Two patients with the full mutation also had Klinefelter syndrome. We have used this registry to assess the risk of expansion from parents to children. From mothers with premutation, the overall rate of allele expansion to full mutation is 52.5%, and we found that this rate is higher for male than female offspring (63.6% versus 45.6%; P < 0.001). Furthermore, in mothers with intermediate alleles (45-54 repeats), there were 10 cases of expansion to a premutation allele, and for the smallest premutation alleles (55-59 repeats), there was a 6.4% risk of expansion to a full mutation, with 56 repeats being the smallest allele that expanded to a full mutation allele in a single meiosis. Hence, in our series the risk for alleles of <59 repeats is somewhat higher than in other published series. These findings are important for genetic counselling.
Fragile X Syndrome
Persona de Mediana Edad
Síndrome del Cromosoma X Frágil
Frecuencia de los Genes
Sistema de Registros
This item appears in following Docusalut collectionsHospital Universitario Son Espases - HUSE > Comunicación científica
Instituto de Investigación Sanitaria Islas Baleares - IDISBA > Comunicación científica