ABSTRACT INTRODUCTION The consequences of de novo balanced structural chromosome aberrations diagnosed antenatally are unpredictable, and, as a result, they introduce uncertainty into genetic counseling decisions. OBJECTIVE Describe de novo balanced structural aberrations present at antenatal diagnosis in samples from pregnant women in five Latin American countries and determine their effect on carrier individuals. METHODS This was a retrospective observational study based on analysis of 109,011 antenatal tests conducted from January 1981 to December 2016 in Cuba, Uruguay, Costa Rica, Mexico, and Colombia. Thirteen cytogenetic laboratories provided information that included the cases analyzed during the study period; number of de novo balanced structural aberrations diagnosed antenatally; number of diagnoses with de novo balanced structural aberrations that resulted in termination of pregnancy; detailed descriptions of the karyotypes of de novo balanced structural aberration carriers, and descriptions of the form of diagnosis, including types of samples used (amniotic fluid, chorionic villus or fetal blood). Each laboratory also provided pathology reports and genetic counseling at time of diagnosis. Postnatal followup for pregnancies carried to term continued for at least two years. RESULTS Of the 109,011 antenatal tests studied, 72 (0.07%) showed de novo balanced structural aberrations. These events primarily involved chromosomes 1, 2, 7, 14, 18, and 20. Of the 79 breakpoints identified, the most common were 5p15.3, 7q11.2, 7q22, and 14q24. We identified three breakpoints corresponding to 3.8% (3q13.1, 3q13.2, and 9p12) that were not reported in other studies of de novo balanced structural aberrations diagnosed antenatally in patients from other geographic regions or in studies of chromosomal fragile sites. Two of these breakpoints (3q13.1 and 3q13.2) were associated with high risk of phenotypic abnormalities. Information on antenatal or postnatal followup was available for 62 (86%) of de novo balanced structural aberration carriers; of the 44 carriers with postnatal followup, 10 had phenotypic abnormalities. CONCLUSIONS Three new de novo breakpoints were identified, presumably related to genetic admixture characteristics in Latin America. Since some diseases associated with de novo balanced structural aberrations detected antenatally have a late onset, followup for at least two years is recommended for carriers of these aberrations. The information in this study is useful in genetic counseling for pregnant women in Latin America.

The clinical case of a 3 months first-born infant is described who had been evaluated by a specialist of Clinical Genetics in "Dr. Juan de la Cruz Martínez Maceira" Northern Pediatric Hospital in Santiago de Cuba, for presenting a fissure in the inferior third of the sternum. Later on hemangiomas emerged in the inferior lip, the lobe of the right ear and the lateral right part of the neck, as well as a mid abdominal raphe from the sternal fissure to the navel. The required complementary tests were carried out and she was scheduled for several specialties, with which it was concluded that the patient presented an association of sternal malformation and vascular dysplasia. It is the first case notified in Cuba

Se describe el caso clínico de un lactante primogénito de 3 meses de edad, que había sido evaluado por un especialista de Genética Clínica en el Hospital Infantil Norte "Dr. Juan de la Cruz Martínez Maceira" de Santiago de Cuba, por presentar hendidura del tercio inferior del esternón. Posteriormente aparecieron hemangiomas en el labio inferior, el lóbulo de la oreja derecha y la parte lateral derecha del cuello, así como un rafe abdominal medio desde la hendidura esternal hasta el ombligo. Se practicaron los exámenes complementarios requeridos y se interconsultó con varias especialidades, con lo cual se concluyó que el paciente presentaba una asociación de malformación esternal y displasia vascular. Se trata del primer caso notificado en Cuba

A descriptive and cross sectional study of 50 families, belonging to 6 areas from Santiago de Cuba municipality, assisted in genetics services was carried out during the five year period 2007-2011, aimed at proposing a strategy to reach the excellence in these services. Improvement of the indicators for covering the Genetics Program was achieved. Opinions on the ethical aspects of this advice were in correspondence with the international regulatory rules. Deficiencies existed in the performance of the genetic advisers from assistance and investigative nature. The proposed strategies allowed to increase effectiveness of the genetic advice, the quality in services and the competence and suitability of the staff

Se realizó un estudio descriptivo y transversal de 50 familias, pertenecientes a 6 áreas del municipio Santiago de Cuba, atendidas en servicios de genética, durante el quinquenio 2007-2011, con vistas a proponer una estrategia para alcanzar la excelencia en dichos servicios. Se logró mejoría de los indicadores de cobertura del Programa de Genética. Las opiniones sobre los aspectos éticos de este asesoramiento estuvieron en correspondencia con las normativas internacionales. Existieron deficiencias en el desempeño de los asesores genéticos de índole asistencial e investigativo. Las estrategias propuestas permitieron elevar la efectividad del asesoramiento genético, la calidad de los servicios y la competencia e idoneidad del personal