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1.
Mol Genet Genomic Med ; 8(2): e1087, 2020 02.
Article in English | MEDLINE | ID: mdl-31830383

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.


Subject(s)
Chromosome Disorders/genetics , Cytogenetic Analysis/statistics & numerical data , Genetic Testing/statistics & numerical data , Registries/statistics & numerical data , Adolescent , Adult , Aged , Aged, 80 and over , Child , Child, Preschool , Chromosome Aberrations/classification , Chromosome Disorders/classification , Chromosome Disorders/diagnosis , Chromosome Disorders/epidemiology , Databases, Genetic , Ecuador , Female , Humans , Infant , Male , Middle Aged , Phenotype , Polymorphism, Genetic
2.
urol. colomb. (Bogotá. En línea) ; 28(1): 80-87, 2019. tab, ilus
Article in Spanish | LILACS, COLNAL | ID: biblio-1402289

ABSTRACT

Introducción Los desórdenes de diferenciación sexual son condiciones clínicas en las que existe una discrepancia entre el sexo cromosómico y el sexo fenotípico de un individuo. Esas condiciones suelen resultar angustiantes para los pacientes y sus familias e incluso para el equipo médico tratante debido a la dificultad en diagnosticarlas. Objetivo Presentar las características clínicas, genéticas y hormonales de dos varones con desórdenes de diferenciación sexual. Método Se realizó un estudio descriptivo basado en la revisión y análisis de datos de la historia clínica y la confrontación de los resultados con reportes similares. Resultados Se observaron dos individuos con fenotipo masculino y diagnóstico de hipogonadismo hipergonadotrófico con cariotipo 46, XX. El primer caso presentó testes pequeños y azoospermia, mientras que el segundo caso presentó baja talla, criptorquidea bilateral congénita y escrotos hipoplásicos. En ambos pacientes se exploró la presencia del gen SRY, confirmando su presencia en el primer caso y ausencia en el segundo caso. Conclusiones El diagnóstico genético-molecular actual apela a la combinación de técnicas tradicionales junto a técnicas modernas, como secuenciación por paneles genéticos a fin de identificar etiológicamente los desórdenes de diferenciación sexual. La presentación de esos casos aún se considera rara debido a su baja tasa de frecuencia poblacional, por lo que su reporte siempre resultará útil a la comunidad científica ya que muestran las distintas formas de presentación clínica y el manejo multidisciplinario de esos casos en diferentes contextos clínicos


Introduction Disorders of Sexual Development are clinical conditions in which a discrepancy between the chromosomal sex and the phenotypic sex occurs in an individual. These conditions are often distressing for patients and their families and even for the medical team due to the difficulty of diagnosing them. Objective The aim of this study was to present the clinical, genetic and hormonal characteristics of two males with sexual differentiation disorders. Method A descriptive study was performed based on the review and analysis of the clinical history data and the comparison of the results with similar cases reported. Results Two individuals with a male phenotype and a diagnosis of hypogonadotropic hypogonadism with 46, XX karyotype were observed. The first case presented small testes and azoospermia, while the second case presented low height, congenital bilateral cryptorchid and hypoplastic scrotums. The SRY gene was explored in both patients, and it was confirmed its presence in the first case and its absence in the second case. Conclusions The current molecular-genetic diagnosis calls for the combination of traditional techniques combined with modern techniques, such as the genetic panel sequencing, to identify etiologically the Disorders of Sexual Development. The presentation of these cases is even considered rare because of their low population frequency rate, so their report is always useful to the scientific community, for they show the different ways of the clinical disease presentation and the multidisciplinary management of these cases in different clinical contexts.


Subject(s)
Humans , Male , Sex Differentiation , Genes, sry , Hypogonadism , Scrotum , Disorders of Sex Development , Azoospermia , Karyotype
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