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Hazelnut is among the most important nut crops in Chile, currently covering 46,000 ha. In 2023, the country exported 30,000-ton. In recent years the incidence of plants with internal discoloration, cankers and dieback has been increasing. In some cases, the trees died and had to be removed and, after a year, purple resupinate fruiting bodies were observed growing from the stumps. To determine the etiology of the symptoms and signs, wood samples (n=318) were collected since 2020, from 38 symptomatic orchards from Maule to La Araucanía Regions, primarily from the cvs. Tonda di Giffoni and Lewis. Wood sections 0.5 cm diameter were cut from the symptomatic tissues, disinfected using a sodium hypochlorite (10%) solution, and plated on a quarter-strength acidified potato dextrose agar (aPDA1/4). The plates were incubated and purified on PDA. Subsequently, isolates were identified by morphological and molecular means. Almost half of the isolates (47%) were preliminarily identified as basidiomycetes, based on mycelial features such as the presence of clamp connections, with 45% of them exhibiting abundant whitish cottony fast-growth mycelia, resembling Chondrostereum purpureum (Grinbergs et al., 2020). DNA was extracted and the 500-bp fragment, located between 5S and 18S ribosomal regions, was amplified using APN1 specific primers (Becker et al. 1999), identifying the isolates as C. purpureum. In addition, 5.8S gene of RGM1 (35°13'40.9"S 71°25'14.1"W), RGM2 (36°31'27.95"S 71°46'58.31"W), RGM3 (37°10'54.8"S 72°03'39.6"W), RGM4 (35°19'25.2"S 71°19'54.7"W) and RGM5 (36°35'30.8"S 72°05'18.8"W) isolates, representing different locations within the hazelnut growing area, was amplified using ITS1/ITS4 primers (White et al., 1990). The PCR product was sequenced, and the analysis showed 100% homology among isolates (Genebank codes: PP839283, PP839284, PP839285, PP839286 and PP839287, respectively). To determine the pathogenicity of the isolates, 30-cm healthy cuttings cv. Lewis were inoculated with mycelial plugs, while control shoots were inoculated with sterile agar plugs. Cuttings were vertically arranged in pots with 3-cm water and incubated for 60-d at 22°C. In addition, fresh cuts of 3-y potted plants cv. Lewis were inoculated with mycelial plugs and incubated for 137-d in a shadehouse. After incubation, bark was removed from inoculated cuttings and the length of necrotic lesions was measured. Although discoloration was reproduced by all the isolates in both pathogenicity tests, RGM1 isolate was the most aggressive, causing the complete discoloration of the cuttings and the death of the inoculated plants. To our knowledge this is the first report of C. purpureum causing wood disease in hazelnut. These findings are significant because the disease may not only reduce orchard longevity but also decrease fruit yield and quality, as observed in other fruit crops (Grinbergs et al., 2021).
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Genomic surveillance (GS) programmes were crucial in identifying and quantifying the mutating patterns of SARS-CoV-2 during the COVID-19 pandemic. In this work, we develop a Bayesian framework to quantify the relative transmissibility of different variants tailored for regions with limited GS. We use it to study the relative transmissibility of SARS-CoV-2 variants in Chile. Among the 3443 SARS-CoV-2 genomes collected between January and June 2021, where sampling was designed to be representative, the Gamma (P.1), Lambda (C.37), Alpha (B.1.1.7), B.1.1.348, and B.1.1 lineages were predominant. We found that Lambda and Gamma variants' reproduction numbers were 5% (95% CI: [1%, 14%]) and 16% (95% CI: [11%, 21%]) larger than Alpha's, respectively. Besides, we observed a systematic mutation enrichment in the Spike gene for all circulating variants, which strongly correlated with variants' transmissibility during the studied period (r = 0.93, p-value = 0.025). We also characterised the mutational signatures of local samples and their evolution over time and with the progress of vaccination, comparing them with those of samples collected in other regions worldwide. Altogether, our work provides a reliable method for quantifying variant transmissibility under subsampling and emphasises the importance of continuous genomic surveillance.
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Teorema de Bayes , COVID-19 , Mutação , SARS-CoV-2 , Chile , Humanos , SARS-CoV-2/genética , SARS-CoV-2/isolamento & purificação , COVID-19/transmissão , COVID-19/virologia , COVID-19/epidemiologia , Genoma Viral , Glicoproteína da Espícula de Coronavírus/genéticaRESUMO
Fundamento: la trombofilia hereditaria se define como la tendencia genéticamente determinada al tromboembolismo venoso, entidad con una incidencia importante a nivel mundial. Desde el laboratorio pudieran explicarse un gran porcentaje de estos eventos de trombosis. Objetivo: caracterizar desde el punto de vista clínico humoral las trombofilias hereditarias e identificar la posible relación entre marcadores bioquímicos alterados de trombosis y su recurrencia. Método: se realizó un estudio descriptivo y transversal en el laboratorio de hemostasia del Hospital Provincial Docente Saturnino Lora de Santiago de Cuba, en el periodo de un año. Se tuvo como referencia 39 pacientes: 26 con eventos trombóticos egresados de los Servicios de Angiología, Cirugía Cardiovascular y Neurología, y 13 sin evento conocido, familiares de primera línea de aquellos pacientes que resultaron con marcadores de trombofilia positivos durante el estudio. Las variables clínicas analizadas fueron: edad, sexo, antecedentes personales y familiares de trombosis y número de eventos trombóticos en el paciente. Se calcularon media, desviación estándar y porcentajes. Resultados: el déficit de proteína S ocupó el primer lugar con 22 (56,4 %). La combinación de parámetros alterados que predominó fue el déficit de proteína C y S con 8 (20,5 %). En el 64,1 % se encontraron dos o más marcadores alterados; se muestran similares porcentajes en pacientes con 1, con 2 dos o más eventos de trombosis. Conclusión: la trombofilia se presentó como una enfermedad que afecta fundamentalmente a mujeres, en edades intermedias de la vida. En pacientes asintomáticos con antecedentes familiares de evento trombótico, sin aparente causa, los marcadores de laboratorio orientan el enfoque diagnóstico. La presencia de dos o más marcadores trombogénicos positivos inclina a la ocurrencia de eventos trombóticos en esta población.
Foundation: hereditary thrombophilia is defined as the genetically determined tendency to venous thromboembolism, an entity with a significant incidence worldwide. A large percentage of these thrombosis events could be explained from the laboratory. Objective: to characterize hereditary thrombophilias from a humoral clinical point of view and to identify the possible relationship between altered biochemical markers of thrombosis and its recurrence. Method: a descriptive and cross-sectional study was carried out in the hemostasis laboratory of the Saturnino Lora Provincial Teaching Hospital of Santiago de Cuba, over a period of one year. 39 patients were used as a reference: 26 with thrombotic events discharged from the Angiology, Cardiovascular Surgery and Neurology Services, and 13 without a known event, first-line relatives of those patients who had positive thrombophilia markers during the study. The clinical variables analyzed were: age, sex, personal and family history of thrombosis and number of thrombotic events in the patient. Mean, standard deviation and percentages were calculated. Results: protein S deficiency ranked first with 22 (56.4 %). The combination of altered parameters that predominated was protein C and S deficiency with 8 (20.5 %). Two or more altered markers were found in 64.1 %; similar percentages are shown in patients with 1, 2 or more thrombosis events. Conclusion: thrombophilia was presented as a disease that mainly affects women, at intermediate ages of life. In asymptomatic patients with a family history of thrombotic event, without apparent cause, laboratory markers guide the diagnostic approach. The presence of two or more positive thrombogenic markers suggests the occurrence of thrombotic events in this population.
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Background: Vaccine effectiveness against SARS-CoV-2 infection has been somewhat limited due to the widespread dissemination of the Omicron variant, its subvariants, and the immune response dynamics of the naturally infected with the virus. Methods: Twelve subjects between 3-17 years old (yo), vaccinated with two doses of CoronaVac®, were followed and diagnosed as breakthrough cases starting 14 days after receiving the second dose. Total IgGs against different SARS-CoV-2 proteins and the neutralizing capacity of these antibodies after infection were measured in plasma. The activation of CD4+ and CD8+ T cells was evaluated in peripheral blood mononuclear cells stimulated with peptides derived from the proteins from the wild-type (WT) virus and Omicron subvariants by flow cytometry, as well as different cytokines secretion by a Multiplex assay. Results: 2 to 8 weeks post-infection, compared to 4 weeks after 2nd dose of vaccine, there was a 146.5-fold increase in neutralizing antibody titers against Omicron and a 38.7-fold increase against WT SARS-CoV-2. Subjects showed an increase in total IgG levels against the S1, N, M, and NSP8 proteins of the WT virus. Activated CD4+ T cells showed a significant increase in response to the BA.2 subvariant (p<0.001). Finally, the secretion of IL-2 and IFN-γ cytokines showed a discreet decrease trend after infection in some subjects. Conclusion: SARS-CoV-2 infection in the pediatric population vaccinated with an inactivated SARS-CoV-2 vaccine produced an increase in neutralizing antibodies against Omicron and increased specific IgG antibodies for different SARS-CoV-2 proteins. CD4+ T cell activation was also increased, suggesting a conserved cellular response against the Omicron subvariants, whereas Th1-type cytokine secretion tended to decrease. Clinical Trial Registration: clinicaltrials.gov #NCT04992260.
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Anticorpos Neutralizantes , Anticorpos Antivirais , Linfócitos T CD4-Positivos , Vacinas contra COVID-19 , COVID-19 , SARS-CoV-2 , Adolescente , Criança , Pré-Escolar , Feminino , Humanos , Masculino , Anticorpos Neutralizantes/sangue , Anticorpos Neutralizantes/imunologia , Anticorpos Antivirais/sangue , Anticorpos Antivirais/imunologia , Linfócitos T CD4-Positivos/imunologia , Linfócitos T CD8-Positivos/imunologia , COVID-19/imunologia , COVID-19/prevenção & controle , Vacinas contra COVID-19/imunologia , Vacinas contra COVID-19/administração & dosagem , Citocinas/imunologia , Citocinas/sangue , Imunoglobulina G/sangue , Imunoglobulina G/imunologia , SARS-CoV-2/imunologia , Vacinação , SeguimentosRESUMO
PURPOSE: Breast cancer mortality rates in Latin America (LA) are higher than those in the United States, possibly because of advanced disease presentation, health care disparities, or unfavorable molecular subtypes. The Latin American Cancer Research Network was established to address these challenges and to promote collaborative clinical research. The Molecular Profiling of Breast Cancer Study (MPBCS) aimed to evaluate the clinical characteristics and treatment outcomes of LA participants with locally advanced breast cancer (LABC). PATIENTS AND METHODS: The MPBCS enrolled 1,449 participants from Argentina, Brazil, Chile, Mexico, and Uruguay. Through harmonized procedures and quality assurance measures, this study evaluated clinicopathologic characteristics, neoadjuvant chemotherapy response, and survival outcomes according to residual cancer burden (RCB) and the type of surgery. RESULTS: Overall, 711 and 480 participants in the primary surgery and neoadjuvant arms, respectively, completed the 5-year follow-up period. Overall survival was independently associated with RCB (worse survival for RCBIII-adjusted hazard ratio, 8.19, P < .001, and RCBII [adjusted hazard ratio, 3.69, P < .008] compared with RCB0 [pathologic complete response or pCR]) and type of surgery (worse survival in mastectomy than in breast-conserving surgery [BCS], adjusted hazard ratio, 2.97, P = .001). The hormone receptor-negative-human epidermal growth factor receptor 2-positive group had the highest proportion of pCR (48.9%). The analysis of the ASCO Quality Oncology Practice Initiative breast module revealed high compliance with pathologic standards but lower adherence to treatment administration standards. Notably, compliance with trastuzumab administration varied widely among countries (33.3%-88.7%). CONCLUSION: In LABC, we demonstrated the survival benefit of BCS and the prognostic effect of the response to available neoadjuvant treatments despite an important variability in access to key treatments. The MPBCS represents a significant step forward in understanding the real-world implementation of oncologic procedures in LA.
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Neoplasias da Mama , Terapia Neoadjuvante , Humanos , Neoplasias da Mama/terapia , Neoplasias da Mama/diagnóstico , Neoplasias da Mama/patologia , Neoplasias da Mama/mortalidade , Feminino , Pessoa de Meia-Idade , América Latina/epidemiologia , Adulto , IdosoRESUMO
In recent studies, emphasis has been placed on the zonula occludens toxin (Zot) from the non-toxigenic Vibrio parahaemolyticus strain PMC53.7 as an agent inducing alterations in the actin cytoskeleton of infected Caco-2 cells and which appears as a relevant virulence factor. Universal zot primers were designed by the alignment of different types of zot gene and identification of conserved sequences to investigate the presence in diverse environmental and clinical V. parahaemolyticus isolates, in co-occurrence with virulence factors, such a hemolysins and secretion systems. The study screened a total of 390 isolates from environmental sources from Chile and Italy and 95 Chilean clinical isolates. The results revealed that around 37.2% of Chilean environmental strains and 25.9% of Italian strains, and 24.2% of clinical isolates carried the zot gene. The Zot-C2 cluster was present in 71.4% of Chilean environmental strains but absent in clinical isolates, while the Zot-C4 cluster was identified in 28.6% of environmental and 100% of clinical isolates. Understanding the role of zot in V. parahaemolyticus virulence is crucial, especially considering the risk associated with consuming diverse isolates from bivalves and the co-occurrence with virulence factors such as TDH, TRH or T3SS2.
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Resumen Se plantearon dos objetivos: (O1) analizar los efectos de una intervención de artes marciales sobre las actitudes hacia la violencia; (O2) Señalar estrategias pedagógicas útiles para este tipo de programas. Se diseñó un estudio de caso dentro de un proceso de investigación-acción participativa. Participaron siete estudiantes de educación primaria (6-11 años) usuarios de un centro de día. Se implementó una intervención de ocho semanas (15 sesiones) basada en el Brazilian Jiu-Jitsu (BJJ). Se recogió información a través de grupos de discusión, entrevistas individuales y diario del profesor. El análisis produjo tres categorías/temas (nueve subcategorías): cambios (actitudes hacia la violencia, comportamiento, relaciones sociales), sensaciones (positivas, negativas) y estrategias pedagógicas (contacto físico, etiqueta, encargado, juegos con momentos de calma). Los objetivos planteados fueron ampliamente conseguidos, disminuyendo las actitudes hacia la violencia de los participantes (O1) y señalando estrategias pedagógicas para poder replicar la intervención en diferentes contextos (O2). Por lo tanto, el programa puede considerarse un éxito para la mejora de las actitudes hacia violencia de jóvenes en riesgo de exclusión que acudan a un centro de día.
Resumo Foram definidos dois objetivos: (O1) analisar os efeitos de uma intervenção de artes marciais nas atitudes face à violência; (O2) Apontar estratégias pedagógicas para esse tipo de programa. Um estudo de caso foi desenhado dentro de um processo de pesquisa-ação participativa. Participaram sete alunos do ensino básico (6-11 anos), utentes de um centro de dia. Foi implementada uma intervenção de oito semanas (15 sessões) baseada no Brazilian Jiu-Jitsu. As informações foram coletadas por meio de grupos focais, entrevistas individuais e diário do professor. A análise produziu três categorias/temas (nove subcategorias): mudanças (atitudes perante à violência, comportamento, relações sociais), sensações (positivas, negativas) e estratégias pedagógicas (contato físico, etiqueta, gerente, jogos com momentos de calma). Os objetivos declarados foram em grande parte alcançados através da redução das atitudes dos participantes face à violência (O1) e da indicação de estratégias pedagógicas para poder replicar a intervenção em diferentes contextos (O2). Portanto, o programa pode ser considerado um sucesso por melhorar as atitudes face à violência entre os jovens em risco de exclusão que frequentam um centro de dia.
Abstract Two objectives were set: (O1) to analyze the effects of a martial arts intervention on attitudes towards violence; (O2) Point out pedagogical strategies for this type of program. A case study was designed within a participatory-action-research process. Seven primary school students (6-11 years old), users of a day center, participated. An eight-week intervention (15 sessions) based on Brazilian Jiu-Jitsu was implemented. Information was collected through focus groups, individual interviews and the teacher's diary. The analysis produced three categories/themes (nine subcategories): changes (attitudes towards violence, behavior, social relationships), sensations (positive, negative) and pedagogical strategies (physical contact, etiquette, manager, games with moments of calm). The stated objectives were largely achieved by reducing participants' attitudes towards violence (O1) and indicating pedagogical strategies to be able to replicate the intervention in different contexts (O2). Therefore the program can be considered a success for improving attitudes towards violence among young people at risk of exclusion who attend a day center.
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Introducción: El consentimiento informado es un acto importante de la relación médico-paciente, constituye un proceso y un documento médico-legal-bioético trascendente de esta relación. En este sentido, el consentimiento se utiliza como una herramienta que favorece el diálogo y la comprensión durante el tratamiento quirúrgico. Objetivo: Brindar un análisis y actualización del tema desde el contexto de la cirugía oncológica por la importancia de esta temática en la actualidad. Métodos: Se realizó una revisión de la literatura relevante publicada sobre el tema en bases de datos PubMed, SciELO, Google Académico. Se priorizaron los últimos 5 años y los textos escritos en idiomas inglés y español. Se hizo énfasis en las palabras consentimiento, bioética y oncología. Se revisó un total de 35 artículos. Desarrollo: La creciente demanda de terapias novedosas en la medicina, y aún más en la oncología, ha planteado nuevos dilemas éticos para la sociedad. La toma de decisiones en cuestiones de salud es un elemento central de la autonomía. Existen diversos conceptos de entorno al paciente quirúrgico que padece de cáncer. Conclusiones: Aplicar la bioética a la práctica de la oncología permite acceder al escenario donde las decisiones pasan por un análisis ético. Cuando los principios bioéticos son ejercidos como un procedimiento habitual como es el consentimiento informado, la relación médico-paciente refleja acciones dirigidas a favorecer la comunicación, el respeto a la dignidad y el proceso al final de la vida.
Introduction: Informed consent is an important act of the doctor-patient relationship, it is a process and a medical-legal-bioethical document that is transcendent of this relationship. In this sense, consent is used as a tool that favors dialogue and understanding during surgical treatment. Objective: Provide an analysis and update of the topic from the context of oncological surgery due to the importance of this topic today. Methods: A review of the relevant literature published on the subject was carried out in PubMed, SciELO, Google Scholar databases, emphasizing the last 5-years, and in the English and Spanish languages, emphasizing the words consent, bioethics, and oncology. A total of 35 articles were reviewed. Development: The growing demand for novel therapies in medicine and even more in oncology, has raised new ethical dilemmas for society. Decision-making in health matters is a central element of autonomy, there are various concepts related to the surgical patient suffering from cancer. Hence the importance of consent and motivation of this work. Conclusions: Applying bioethics to the practice of oncology allows access to the scenario where decisions go through an ethical analysis. When bioethical principles are exercised as a regular procedure such as informed consent, the doctor-patient relationship reflects actions aimed at promoting communication, respect for dignity and the process at the end of life.
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Introduction: The D antigen variants are classified as weak, partial, and extremely weak (DEL) and can be differentiated using molecular tests. In Chile, the laboratories of local blood centers do not identify variants of the D antigen, referring them for study to the Reference Laboratory of the Public Health Institute of Chile. So, our aim was to talk about the results of the molecular analysis of variants of the D antigen in samples that had different results in the serological classification. Methods: In the D antigen classification of the Rh system, 479 samples with serological discrepant results were sent for molecular analysis. The Rh phenotype was performed with monoclonal anti-C, anti-c, anti-E, and anti-e antisera by direct agglutination. To find the D antigen, researchers used direct agglutination with monoclonal antisera and indirect antiglobulin testing with the column (gel) agglutination method. Molecular analysis was performed with a polymerase chain reaction with sequence-specific primers (SSP-PCR) and sequencing. Results and discussion: The presence of D antigen variants was confirmed in 332 samples (69.3%), with an initial discrepancy in serological classification. In this group of discrepant samples, the frequency of weak RhD variants was 66% (219/332), that of extremely weak RhD was 28% (93/332), and that of partial RhD was 6% (20/332). The weak variants type 2 (27.4%), type 3 (8.4%), type 48 (8.4%), and type 1 (8.1%) were the next most prevalent variants after RHD*DEL43 (28%). The ccEe (R2r) phenotype was the most frequently detected (38.4%) and is present in 87% of the RHD*DEL43 samples. The E antigen is associated with the presence of this variant. Our analyses give the first description of D antigen variants in Chile. The most common variants are DEL type (RHD*DEL43) and weak (weak type 2), which are linked to the ccDEe (R2r) phenotype. These findings allow us to characterize the variants of the D antigen in Chile and, according to the obtained data, to design strategies for the management of donors, patients, and pregnant women.
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Sistema do Grupo Sanguíneo Rh-Hr , Feminino , Humanos , Gravidez , Chile , Genótipo , Soros Imunes , Fenótipo , Reação em Cadeia da Polimerase , Sistema do Grupo Sanguíneo Rh-Hr/genéticaRESUMO
Actualmente existe una tendencia mundial de desplazamiento de la población rural hacia áreas cada vez más urbanizadas. Existe evidencia que informa que el desarrollo de las enfermedades mentales tiene relación importante con factores tanto internos (por ejemplo, genéticos) y externos (el ambiente, entre otros). Con respecto a esto último, la manera en la que el entorno afecta a la salud mental es un objeto de estudio de interés global y se ha reportado que las áreas urbanas presentan mayores tasas de trastornos mentales comunes en comparación con las rurales. En el caso de la psicosis, por más de que el factor genético sea el más demostrado (y estudiado en los últimos años), el factor ambiental representando por el ambiente urbano ya ha sido analizado por investigadores a inicios del siglo 20. Desde allí, a lo largo de los años se obtuvo evidencia repetida que lo respalda como un factor de riesgo. Se ha encontrado que, además, existe relación con el grado de exposición, lo que hace pensar que la causa no solamente se limita a la transición del área rural al área urbana, sino que están involucrados factores sociales, económicos y medioambientales más profundos como la disparidad social, inseguridad, contaminación, entre otros 1. Ya en las últimas décadas del siglo 20, investigadores informaron de un aumento de la incidencia de esquizofrenia de 1,65 en hombres que vivían ciudades sobre sus contrapartes de origen rural. Años después, otros estudios han reportado esta variación en la incidencia de primeros episodios psicóticos a través del gradiente social urbano-rural, así como una relación entre el aumento de hospitalización por esquizofrenia con el grado de urbanización.