Browsing by Author "Curotto, Bianca"

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    Búsqueda de afecciones genéticas como etiología de déficit intelectual en individuos que asisten a escuelas de educación especial
    (Sociedad Médica de Santiago, 2008) Alliende, María Angélica; Campora, Laura; Curotto, Bianca; Toro, Jessica; Valiente, Alf; Castillo, Marcela; Cortés, Fanny; Trigo, César; Alvarado, Cecilia; Silva, Manuel; Caru, Margarita
    Background: Mental retardation or intellectual disability affects 2% ofthe general population, but in 60% to 70% of cases the real cause ofthis retardation is not known. An early etiologic diagnosis of intellectual disability can lead to opportunities for improved educational interventions, reinforcing weak areas and providing a genetic counseling to the family Aim: To search genetic diseases underíying intellectual disabilities of children attending a special education school. Material and methods: A clinical geneticist performed the history and physical examination in one hundred and three students aged between 5 and 24 years (51 males). A blood sample was obtained in 92 of them for a genetic screening that included a standard karyotype, fragile X molecular genetic testing and search for inborn errors of metabolism by tándem mass spectrometry. Results: This approach yielded an etiological diagnosis in as much as 29 patients. Three percent of them had a fragile X syndrome. Inborn errors of metabolism were not detected. Conclusions: This type of screening should be done always in children with intellectual disability to establish an etiological diagnosis.
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    Comparison of two subtelomeric assays for the screening of chromosomal rearrangements: analysis of 383 patients, literature review and further recommendations
    (Polish Academy of Sciences with Springer International Publishing AG,, 2016) Santa María, Lorena; Faundes, Víctor; Curotto, Bianca; Morales, Paulina; Morales, Karla; Aliaga, Solange; Pugin, Ángela; Alliende, María Angélica
    Intellectual disability (ID) and global development delay (GDD) are caused by genetic factors such as subtelomeric rearrangements (SR) in 25 % of patients. There are several assays currently available to detect SR, but subtelomeric fluorescence in situ hybridisation (Subt-FISH) and subtelomeric multiplex ligation-dependent probe amplification (Subt-MLPA) have been the most frequently used. However, the diagnostic yield of each technique has not been compared. We reviewed the results of SR screening over a ten-year period in Chilean patients with ID/GDD using Subt-FISH and/or Subt-MLPA, compared the diagnostic yield of both tools and reviewed the corresponding literature. A total of 383 cases were included in this study, of which 53.8 % were males. The overall diagnostic yield was 8.9 % between both methods, but Subt-MLPA showed a higher performance than Subt-FISH (p = 0.002). A total of 4,181 patients with ID/GDD have been studied worldwide with Subt-MLPA and other subtelomeric assays, and 244 (5.84 %) had a pathogenic SR. It is estimated that Subt-MLPA may detect 92.6 % of the total cases with SR. The capacity of detecting tandem duplication and other critical regions, as well as the use of two MLPA kits, may explain the higher performance of this tool over Subt-FISH. Therefore, we recommend the use of this subtelomeric method as a cost-effective way to study ID/GDD patients.

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