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Objective. This paper assesses the availability and quality of death certificate data in Latin America and the feasibility of using these data to study place of death and associated factors. Methods. In this comparative study, we collected examples of current official death certificates and digital data files containing information about all deaths that occurred during 1 year in 19 Latin American countries. Data were collected from June 2019 to May 2020. The records for place of death and associated variables were studied. The criteria for data quality were completeness, number of ill-defined causes of death and timeliness. Results. All 19 countries provided copies of current official death certificates and 18 of these registered the place of death. Distinguishing among hospital or other health care institution, home and other was possible for all countries. Digital data files with death certificate data were available from 12 countries and 1 region. Three countries had data considered to be of high quality and seven had data considered to be of medium quality. Categories for place of death and most of the predetermined factors possibly associated with place of death were included in the data files. Conclusions. The quality of data sets was rated medium to high in 10 countries. Hence, death certificate data make it feasible to conduct an international comparative study on place of death and the associated factors in Latin America. Objetivo. En este artículo se evalúa la disponibilidad y la calidad de los datos del certificado de defunción en América Latina y la factibilidad de emplear estos datos para estudiar el lugar de defunción y factores asociados. Métodos. En este estudio comparativo, se recogieron ejemplos de certificados oficiales de defunción actuales y archivos digitales de datos que contenían información acerca de todas las defunciones que ocurrieron durante un año en 19 países latinoamericanos. Se recopilaron datos desde junio del 2019 hasta mayo del 2020. Se estudiaron los registros del lugar de la muerte y las variables asociadas. Los criterios para determinar la calidad de los datos fueron la exhaustividad, el número de causas de muerte mal definidas y la presentación oportuna de la información. Resultados. Los 19 países proporcionaron copias de los certificados oficiales de defunción actuales; en 18 de estos se registraba el lugar de la muerte. En todos los países fue posible distinguir entre hospital u otra institución de atención de salud, el hogar y otros. Se obtuvieron los archivos de datos digitales con los datos del certificado de defunción de 12 países y una región. Tres países tenían datos considerados de buena calidad y siete tenían datos considerados de calidad media. En los archivos de datos se incluyeron categorías para lugar de defunción y la mayoría de los factores predeterminados posiblemente asociados con el lugar de defunción. Conclusiones. La calidad de los conjuntos de datos se calificó de media a buena en 10 países. En consecuencia, es factible realizar un estudio internacional comparativo sobre el lugar de defunción y los factores asociados en América Latina con los datos del certificado de defunción. Objetivo. Este estudo avalia a disponibilidade e a qualidade dos dados das declarações de óbito na América Latina e a viabilidade de usar esses dados para estudar o local do óbito e fatores associados. Métodos. Neste estudo comparativo, coletamos exemplos de declarações de óbito oficiais atuais e arquivos de dados digitais contendo informações sobre todos os óbitos que ocorreram durante 1 ano em 19 países latinoamericanos. Os dados foram coletados no período de junho de 2019 a maio de 2020. Foram estudados os registros do local do óbito e variáveis associadas. Os critérios de qualidade dos dados foram preenchimento completo, número de causas mal definidas de morte e oportunidade. Resultados. Todos os 19 países forneceram cópias das declarações de óbito oficiais atuais, e 18 deles registraram o local do óbito . Foi possível distinguir em todos os países entre hospital ou outra instituição de saúde, lar ou outro local. Arquivos de dados digitais com os dados das declarações de óbito foram disponibilizados por 12 países e 1 região. Três países tiveram dados considerados de alta qualidade, e sete tiveram dados considerados de qualidade média. As categorias de local do óbito e a maioria dos fatores predeterminados possivelmente associados ao local do óbito foram incluídos nos arquivos de dados. Conclusões. A qualidade dos conjuntos de dados foi classificada como média a alta em 10 países. Portanto, os dados de declarações de óbito possibilitam a realização de um estudo comparativo internacional sobre local do óbito e fatores associados na América Latina.

Circular RNAs (circRNAs) are highly abundant and evolutionary conserved RNAs of mostly unknown functions. circRNAs are enriched in the brain and accumulate with age in flies, worms and mice. Despite their abundance, little is known about their functions, especially in the context of whole organisms. Here we report the development and use of shRNAs to knock down and study the function of circMbl, the most abundant circRNA inDrosophila.This circRNA is highly conserved through evolution and is generated from the locus of the essential splicing factormuscleblind(mbl). Briefly, we generated flies in which circMbl is reduced more than 90% without measurable off-target effects in the hosting gene as well as in other RNAs. These flies display specific defects that suggest roles of circMbl in muscle and neural tissues during development and in adult flies. More specifically, whole organism downregulation of circMbl leads to male developmental lethality, altered gene expression, behavioral defects, wing posture- and flight defects. Moreover, these phenotypes are recapitulated by a second shRNA targeting circMbl. Importantly, knockdown and overexpression of circMbl affect mostly the same genes but in the opposite direction. Last but not least, downregulation of circMbl in the fly central nervous system caused abnormal synaptic function. Together, our results demonstrate the functionality of circMbl at the organismal level likely by acting in multiple tissues. Moreover, here we provide the first proof of functionality of circRNAs inDrosophilaas well as a methodological approach that enables the comprehensive study of circRNAsin vivo.SIGNIFICANCE STATEMENTCircular RNAs (circRNAs) are highly abundant and evolutionary conserved RNAs of mostly unknown functions. Here we report the development and use of a shRNA-based system to knockdown specific circRNAsin vivo. We generated flies in which circMbl, the most abundant circRNA is reduced more than 90% without measurable off-target effects. These flies display male developmental lethality, altered gene expression, behavioral defects, wing posture- and flight defects. These phenotypes are recapitulated by a second shRNA targeting circMbl. Moreover, downregulation of circMbl in the fly central nervous system caused abnormal synaptic function. Together, our results demonstrate the functionality of circMbl at the organismal level and provide a methodological approach that enables the comprehensive study of circRNAsin vivo.