11 research outputs found

    LA LINFOHISTIOCITOSIS HEMOFAGOCÍTICA SECUNDARIA A LUPUS SISTEMICO CON CLINICA DE MIS-C REFRACTARIO EN NIÑOS: REPORTE DE CASO

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    We report the case of an 11-year-old male adolescent, with symptoms of MISC-PIMS, negative RT-PCR and negative serology for COVID-19, family contact RT-PCR positive for COVID-19, treated in a referral hospital center, receiving treatment standardized for MIS-C, without response to initial therapy, despite receiving the same scheme on 3 occasions, classified as refractory, for which an expanded study was decided for other entities; finding hemophagocytic lymphohistiocytosis associated with systemic lupus erythematosus, an entity that often share similar inflammatory markers with the MISC, even usually confused with rheumatological, hematological and neoplastic entities, therefore the importance of reporting the case to identify this group refractory to treatment and identify another disease with expanded study, since it could be harmful or even fatal if a definitive diagnosis is not obtained.Reportamos el caso de un adolescente varón de 11 años, con clínica de MISC-PIMS, RT-PCR negativa y serología negativa para COVID-19, contacto familiar RT-PCR positiva para COVID-19, atendido en un centro hospitalario referencial, recibiendo tratamiento estandarizado para MIS-C, sin respuesta a la terapéutica inicial, a pesar de recibir en 3 oportunidades el mismo esquema, catalogado como refractario, por lo que se decide estudio ampliado para otras entidades; encontrándose Linfohistiocitosis hemofagocítica asociada a Lupus eritematoso sistémico, entidad que muchas veces comparten marcadores inflamatorios similares con el MISC, inclusive usualmente confundida con entidades reumatológicas, hematológicas y neoplásicas, por eso la importancia de reportar el caso para identificar este grupo refractario al tratamiento e identificar otra enfermedad con estudio ampliado, ya que podría ser perjudicial hasta inclusive mortal si no se obtiene un diagnostico definitivo

    Caracterización de la diversidad genética en naranja y comparación del polimorfismo de microsatélites amplificados al azar (rams) usando electroforesis de poliacrilamida y agarosa

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    Se compararon las eficiencias de tres métodos de electroforesis en agarosa y poliacrilamida, usando la cámara pequeña de DNA Sequencing System y cámara grande OWL Sequi-Gen Sequencing Cell, en la detección del polimorfismo en 21 accesiones de naranja (Citrus sinensis) con empleo del cebador CGA. El gel de poliacrilamida dio mejor resolución de los productos amplificados vía PCR producidos por RAMs. Este permitió una mejor detección de bandas de ADN polimórficas, lo que facilitó la identificación de la variabilidad genética. La electroforesis en agarosa puede ser más conveniente en otras aplicaciones, debido al bajo costo y fácil aplicación. El estudio de diversidad genética en naranja usando microsatélites RAMs diferenció 51 accesiones en siete grupos con 0.75 de similaridad y 0.25 de heterocigosidad, lo que revela bajo polimorfismo genético. La técnica RAMs permitió agrupar las accesiones en Comunes o Blancas, Navel y Pigmentadas o Sanguinas

    Etiology of hospital mortality in children living in low- and middle-income countries:a systematic review and meta-analysis

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    In 2019, 80% of the 7.4 million global child deaths occurred in low- and middle-income countries (LMICs). Global and regional estimates of cause of hospital death and admission in LMIC children are needed to guide global and local priority setting and resource allocation but are currently lacking. The study objective was to estimate global and regional prevalence for common causes of pediatric hospital mortality and admission in LMICs. We performed a systematic review and meta-analysis to identify LMIC observational studies published January 1, 2005-February 26, 2021. Eligible studies included: a general pediatric admission population, a cause of admission or death, and total admissions. We excluded studies with data before 2,000 or without a full text. Two authors independently screened and extracted data. We performed methodological assessment using domains adapted from the Quality in Prognosis Studies tool. Data were pooled using random-effects models where possible. We reported prevalence as a proportion of cause of death or admission per 1,000 admissions with 95% confidence intervals (95% CI). Our search identified 29,637 texts. After duplicate removal and screening, we analyzed 253 studies representing 21.8 million pediatric hospitalizations in 59 LMICs. All-cause pediatric hospital mortality was 4.1% [95% CI 3.4%–4.7%]. The most common causes of mortality (deaths/1,000 admissions) were infectious [12 (95% CI 9–14)]; respiratory [9 (95% CI 5–13)]; and gastrointestinal [9 (95% CI 6–11)]. Common causes of admission (cases/1,000 admissions) were respiratory [255 (95% CI 231–280)]; infectious [214 (95% CI 193–234)]; and gastrointestinal [166 (95% CI 143–190)]. We observed regional variation in estimates. Pediatric hospital mortality remains high in LMICs. Global child health efforts must include measures to reduce hospital mortality including basic emergency and critical care services tailored to the local disease burden. Resources are urgently needed to promote equity in child health research, support researchers, and collect high-quality data in LMICs to further guide priority setting and resource allocation

    Clonal chromosomal mosaicism and loss of chromosome Y in elderly men increase vulnerability for SARS-CoV-2

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    The pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2, COVID-19) had an estimated overall case fatality ratio of 1.38% (pre-vaccination), being 53% higher in males and increasing exponentially with age. Among 9578 individuals diagnosed with COVID-19 in the SCOURGE study, we found 133 cases (1.42%) with detectable clonal mosaicism for chromosome alterations (mCA) and 226 males (5.08%) with acquired loss of chromosome Y (LOY). Individuals with clonal mosaic events (mCA and/or LOY) showed a 54% increase in the risk of COVID-19 lethality. LOY is associated with transcriptomic biomarkers of immune dysfunction, pro-coagulation activity and cardiovascular risk. Interferon-induced genes involved in the initial immune response to SARS-CoV-2 are also down-regulated in LOY. Thus, mCA and LOY underlie at least part of the sex-biased severity and mortality of COVID-19 in aging patients. Given its potential therapeutic and prognostic relevance, evaluation of clonal mosaicism should be implemented as biomarker of COVID-19 severity in elderly people. Among 9578 individuals diagnosed with COVID-19 in the SCOURGE study, individuals with clonal mosaic events (clonal mosaicism for chromosome alterations and/or loss of chromosome Y) showed an increased risk of COVID-19 lethality

    Phylogenetic classification of the world's tropical forests

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    Knowledge about the biogeographic affinities of the world’s tropical forests helps to better understand regional differences in forest structure, diversity, composition, and dynamics. Such understanding will enable anticipation of region-specific responses to global environmental change. Modern phylogenies, in combination with broad coverage of species inventory data, now allow for global biogeographic analyses that take species evolutionary distance into account. Here we present a classification of the world’s tropical forests based on their phylogenetic similarity. We identify five principal floristic regions and their floristic relationships: (i) Indo-Pacific, (ii) Subtropical, (iii) African, (iv) American, and (v) Dry forests. Our results do not support the traditional neo- versus paleotropical forest division but instead separate the combined American and African forests from their Indo-Pacific counterparts. We also find indications for the existence of a global dry forest region, with representatives in America, Africa, Madagascar, and India. Additionally, a northern-hemisphere Subtropical forest region was identified with representatives in Asia and America, providing support for a link between Asian and American northern-hemisphere forests.</p

    Caracterización molecular de genotipos de plátano del banco de germoplasma de corpoica palmira, con uso de marcadores rams

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    El objetivo de este trabajo fue caracterizar molecularmente 79 genotipos de plátano del Banco de Germoplasma existente en la Corporación Colombiana de Investigación Agropecuaria, Corpoica Palmira, con uso de seis marcadores RAM. Se generaron noventa y tres bandas; el porcentaje de loci polimórfico varió en 88% y 90% para los cebadores TG y CT, respectivamente. El estudio de diversidad genética diferenció las setenta y nueve accesiones en ocho grupos con una similaridad de 0.78 y una heterocigosidad de 0.31, lo que revela gran polimorfismo genético. La técnica RAM permitió agrupar las accesiones de plátanos según su composición genómica, por lo cual puede ser una herramienta molecular útil para evaluar la diversidad genética en Musáceas

    Caracterización de la diversidad genética en naranja y comparación del polimorfismo de microsatélites amplificados al azar (RAMs) usando electroforesis de poliacrilamida y agarosa

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    Se compararon las eficiencias de tres métodos de electroforesis en agarosa y poliacrilamida, usando la cámara pequeña de DNA Sequencing System y cámara grande OWL Sequi-Gen Sequencing Cell, en la detección del polimorfismo en 21 accesiones de naranja (Citrus sinensis) con empleo del cebador CGA. El gel de poliacrilamida dio mejor resolución de los productos amplificados vía PCR producidos por RAMs. Este permitió una mejor detección de bandas de ADN polimórficas, lo que facilitó la identificación de la variabilidad genética. La electroforesis en agarosa puede ser más conveniente en otras aplicaciones, debido al bajo costo y fácil aplicación. El estudio de diversidad genética en naranja usando microsatélites RAMs diferenció 51 accesiones en siete grupos con 0.75 de similaridad y 0.25 de heterocigosidad, lo que revela bajo polimorfismo genético. La técnica RAMs permitió agrupar las accesiones en Comunes o Blancas, Navel y Pigmentadas o Sanguinas

    Characterization of the genetic diversity in orange, and comparison of polymorphism in randomly-amplifed microsatellites (rams), using polyacrylamide and agarose electrophoresis

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    We compared the efficiency of three methods of agarose and polyacrylamide electrophoresis (using the small tank of the DNA Sequencing System and the large OWL Sequi-Gen Sequencing Cell), for the detection of polymorphism in 21 accessions of orange (Citrus sinensis), using the primer CGA. The polyacrylamide gel gave better resolution of the PCR-amplified RAM products. This method allowed better detection of polymorphic DNA bands, facilitating the identification of genetic variability. The agarose electrophoresis may be more convenient in other applications, due to its low cost and easy implementation. The study of genetic diversity in orange using RAMs separated 51 accessions into seven groups with 0.75 similarity, and 0.25 heterozygosity, revealing low genetic polymorphism. The RAMs technique grouped the accessions into “Common or White”, “Navel” and “Pigmented or “Sanguine”.Se compararon las eficiencias de tres métodos de electroforesis en agarosa y poliacrilamida, usando la cámara pequeña de DNA Sequencing System y cámara grande OWL Sequi-Gen Sequencing Cell, en la detección del polimorfismo en 21 accesiones de naranja (Citrus sinensis) con empleo del cebador CGA. El gel de poliacrilamida dio mejor resolución de los productos amplificados vía PCR producidos por RAMs. Este permitió una mejor detección de bandas de ADN polimórficas, lo que facilitó la identificación de la variabilidad genética. La electroforesis en agarosa puede ser más conveniente en otras aplicaciones, debido al bajo costo y fácil aplicación. El estudio de diversidad genética en naranja usando microsatélites RAMs diferenció 51 accesiones en siete grupos con 0.75 de similaridad y 0.25 de heterocigosidad, lo que revela bajo polimorfismo genético. La técnica RAMs permitió agrupar las accesiones en Comunes o Blancas, Navel y Pigmentadas o Sanguinas

    Phylogenetic classification of the world's tropical forests

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