Conformational Defects in the Limbs of Menorca Purebred Horses and Their Relationship to Functionality.

Limb-conformation defects significantly influence equine performance and welfare, necessitating thorough investigation for effective management. This study examines the prevalence and genetic parameters of 14 limb-conformation defects in Menorca Purebred horses using data from 1120 records (509 animals with an average age of 101.87 ± 1.74 months) collected between 2015 and 2023. Defects were evaluated using a three-class scale by three appraisers, and a Bayesian approach via Gibbs sampling was employed to estimate genetic parameters including gender, birth period, stud selection criteria, evaluation age and appraiser as fixed effects. Splay-footed forelimb and closed hocks were the most prevalent defects (67.20% and 62.53%, respectively). Horses with any of the defects analyzed have been observed to obtain significantly lower scores for both walk and trot. Heritability estimates range from 0.12 (s.d.: 0.025) for closed hock to 0.30 (s.d.: 0.054) for base narrow, confirming the genetic influences on the expression of limb conformation defects. The divergent defect in hind limbs showed the highest genetic correlations with forelimb defects (camped under, -0.69; s.d: 0.32 and camped out, 0.70; s.d: 0.27). The significant genetic correlations between defects highlight the complexity of the relationships, which requires careful consideration.

Gibberellins regulate ovule number through a DELLA-CUC2 complex in Arabidopsis.

Ovule development is a key process for plant reproduction, helping to ensure correct seed production. Several molecular factors and plant hormones such as gibberellins are involved in ovule initiation and development. Gibberellins control ovule development by the destabilization of DELLA proteins, whereas DELLA activity has been shown to act as a positive factor for ovule primordia emergence. But the molecular mechanism by which DELLA acts in ovule primordia initiation remained unknown. In this study we report that DELLA proteins participate in ovule initiation by the formation of a protein complex with the CUC2 transcription factor. The DELLA protein GAI requires CUC2 to promote ovule primordia formation, through the direct GAI-CUC2 interaction in placental cells that would determine the boundary regions between ovules during pistil development. Analysis of GAI-CUC2 interaction and co-localization in the placenta supports this hypothesis. Moreover, molecular analysis identified a subset of the loci for which the GAI protein may act as a transcriptional co-regulator in a CUC2-dependent manner. The DELLA-CUC2 complex is a component of the gene regulatory network controlling ovule primordia initiation in Arabidopsis.

Gibberellins negatively modulate ovule number in plants.

Ovule formation is a complex developmental process in plants, with a strong impact on the production of seeds. Ovule primordia initiation is controlled by a gene network, including components of the signaling pathways of auxin, brassinosteroids and cytokinins. By contrast, gibberellins (GAs) and DELLA proteins, the negative regulators of GA signaling, have never been shown to be involved in ovule initiation. Here, we provide molecular and genetic evidence that points to DELLA proteins as novel players in the determination of ovule number in Arabidopsis and in species of agronomic interest, such as tomato and rapeseed, adding a new layer of complexity to this important developmental process. DELLA activity correlates positively with ovule number, acting as a positive factor for ovule initiation. In addition, ectopic expression of a dominant DELLA in the placenta is sufficient to increase ovule number. The role of DELLA proteins in ovule number does not appear to be related to auxin transport or signaling in the ovule primordia. Possible crosstalk between DELLA proteins and the molecular and hormonal network controlling ovule initiation is also discussed.

Corrigendum: Cell Wall Remodeling in Abscission Zone Cells during Ethylene-Promoted Fruit Abscission in Citrus.

[This corrects the article on p. 126 in vol. 8, PMID: 28228766.].

Cell Wall Remodeling in Abscission Zone Cells during Ethylene-Promoted Fruit Abscission in Citrus.

Abscission is a cell separation process by which plants can shed organs such as fruits, leaves, or flowers. The process takes place in specific locations termed abscission zones. In fruit crops like citrus, fruit abscission represents a high percentage of annual yield losses. Thus, understanding the molecular regulation of abscission is of capital relevance to control production. To identify genes preferentially expressed within the citrus fruit abscission zone (AZ-C), we performed a comparative transcriptomics assay at the cell type resolution level between the AZ-C and adjacent fruit rind cells (non-abscising tissue) during ethylene-promoted abscission. Our strategy combined laser microdissection with microarray analysis. Cell wall modification-related gene families displayed prominent representation in the AZ-C. Phylogenetic analyses of such gene families revealed a link between phylogenetic proximity and expression pattern during abscission suggesting highly conserved roles for specific members of these families in abscission. Our transcriptomic data was validated with (and strongly supported by) a parallel approach consisting on anatomical, histochemical and biochemical analyses on the AZ-C during fruit abscission. Our work identifies genes potentially involved in organ abscission and provides relevant data for future biotechnology approaches aimed at controlling such crucial process for citrus yield.

Insights into the Role of the Berry-Specific Ethylene Responsive Factor VviERF045.

During grape ripening, numerous transcriptional and metabolic changes are required in order to obtain colored, sweet, and flavored berries. There is evidence that ethylene, together with other signals, plays an important role in triggering the onset of ripening. Here, we report the functional characterization of a berry-specific Ethylene Responsive Factor (ERF), VviERF045, which is induced just before véraison and peaks at ripening. Phylogenetic analysis revealed it is close to the SHINE clade of ERFs, factors involved in the regulation of wax biosynthesis and cuticle morphology. Transgenic grapevines lines overexpressing VviERF045 were obtained, in vitro propagated, phenotypically characterized, and analyzed for the content of specific classes of metabolites. The effect of VviERF045 was correlated with the level of transgene expression, with high-expressing lines showing stunted growth, discolored and smaller leaves, and a lower level of chlorophylls and carotenoids. One line with intermediate expression, L15, was characterized at the transcriptomic level and showed 573 differentially expressed genes compared to wild type plants. Microscopy and gene expression analyses point toward a major role of VviERF045 in epidermis patterning by acting on waxes and cuticle. They also indicate that VviERF045 affects phenolic secondary metabolism and induces a reaction resembling a plant immune response with modulation of receptor like-kinases and pathogen related genes. These results suggest also a possible role of this transcription factor in berry ripening, likely related to changes in epidermis and cuticle of the berry, cell expansion, a decrease in photosynthetic capacity, and the activation of several defense related genes as well as from the phenylpropanoid metabolism. All these processes occur in the berry during ripening.

Juegos didácticos para el aprendizaje del Inglés en la carrera de medicina / Didactic Games for the Learning of English in the Medicine Studies

Se realizó una investigación sobre el bajo nivel de motivación hacia la asignatura Inglés en el segundo año de la carrera de medicina, con el objetivo de ofrecer un fundamento científico que explique el por qué de este problema, aportar un folleto metodológico de juegos didácticos para ayudar a elevar el nivel motivacional de los educandos y así, perfeccionar el aprendizaje del inglés. Se utilizaron métodos empíricos (observación científica, entrevista, encuesta) y métodos teóricos (histórico-lógico, análisis y síntesis, hipotético deductivo y el análisis de documentos). Se utilizó un universo de 192 alumnos de segundo año de medicina (ocho grupos) del municipio Holguín. Este folleto fue utilizado por el colectivo de segundo año, los juegos fueron aplicados en todas las unidades en la última clase a modo de consolidación. Con el uso del folleto metodológico los resultados de las evaluaciones parciales y finales fueron superiores. Se mostró mayor interés hacia la asignatura, aumentó el nivel de competencia lingüística, el trabajo en colectivo, la cooperación, entre otros valores. Esta propuesta aporta la metodología para su puesta en práctica, los objetivos, una breve descripción de cada juego, los procedimientos, el tiempo de duración de cada actividad, así como, el enfoque gramatical de cada juego(AU)

A research about the low motivational level towards the English subject in the 2nd year of the Medicine carrier was carried out. The objective was to give a scientific support that explains the causes of this problem and to provide a methodological pamphlet of games in order to help raising the students motivational level and to improve the learning process of English. A universe of 192 students (eight groups) of the 2nd year of medicine was used. Empirical Methods such as: the interview, the survey, the observation were applied, and theoretical methods such as historical-logical, analysis-synthesis, hypothetical-deductive and the documents analysis were also used. This pamphlet was used by the team of teachers of 2nd year; the games were applied in the last classes of every Unit as a Review. This proposal provided the methodology for its implementation, the objective of every game, procedures, the time needed for each activity as well as the grammar focus of each game. With the use of didactic games in classes the results were significantly superior, the interest for the subject was higher and the acquisition of the contents for this course was accomplished, the students proficiency was elevated, it helped cooperation and group work among other values in the students(AU)

Combinatorial gene therapy renders increased survival in cirrhotic rats.

BACKGROUND: Liver fibrosis ranks as the second cause of death in México's productive-age population. This pathology is characterized by accumulation of fibrillar proteins in hepatic parenchyma causing synthetic and metabolic disfunction. Remotion of excessive fibrous proteins might result in benefit for subjects increasing survival index. The goal of this work was to find whether the already known therapeutical effect of human urokinase Plasminogen Activator and human Matrix Metalloprotease 8 extends survival index in cirrhotic animals. METHODS: Wistar rats (80 g) underwent chronic intoxication with CCl4: mineral oil for 8 weeks. Cirrhotic animals were injected with a combined dose of Ad-delta-huPA plus Ad-MMP8 (3 x 10(11) and 1.5 x 10(11) vp/Kg, respectively) or with Ad-beta-Gal (4.5 x 10(11)) and were killed after 2, 4, 6, 8 and 10 days. Then, liver and serum were collected. An additional set of cirrhotic animals injected with combined gene therapy was also monitored for their probability of survival. RESULTS: Only the cirrhotic animals treated with therapeutical genes (Ad-delta-huPA+Ad-MMP-8) showed improvement in liver fibrosis. These results correlated with hydroxyproline determinations. A significant decrement in alpha-SMA and TGF-beta1 gene expression was also observed. Cirrhotic rats treated with Ad-delta-huPA plus Ad-MMP8 had a higher probability of survival at 60 days with respect to Ad-beta-Gal-injected animals. CONCLUSION: A single administration of Ad-delta-huPA plus Ad-MMP-8 is efficient to induce fibrosis regression and increase survival in experimental liver fibrosis.

Plan de saneamiento para una distribuidora de alimentos que atiende a niños y adultos mayores / A sanitation plan for a food distributor attending children and the elderly

Los niños y adultos mayores representan los consumidores más vulnerables a adquirir enfermedades transmitidas por alimentos, ETA, por lo que se hace más estricto disminuir los factores de riesgo que se generan en la elaboración de alimentos dirigidos para este grupo de población. En este reporte, con el fin de disminuir los factores de riesgo de ETA a una población de niños y adultos mayores, se diseñó y se implementó un plan de saneamiento, siguiendo los lineamientos de decreto 3075 de 1997 del Ministerio de Protección Social de Colombia, y se realizó un plan de capacitación dirigido al personal manipulador implicado en los procesos de recepción, almacenamiento, empaque y distribución de materias primas en una distribuidora de alimentos. El plan de saneamiento y la capacitación permitieron incrementar los porcentajes de cumplimiento en buenas prácticas de manufactura, BPM, del 40 al 70 por ciento, estos resultados son una base sólida para garantizar la inocuidad de los alimentos y la disminución del riesgo de adquirir ETA en la población objeto de estudio.

The responsibility for providing healthy food involves all members of the production chain from input supplier to the distributor and consumer of food. Children and older adults represent the most vulnerable consumers for acquiring food-borne illness (FBI), meaning that the risk factors produced in food-processing targeted for this population group must be reduced. A clean-up plan was thus designed and implemented following the guideline laid down in decree 3075/1997 to reduce FBI risk factors in a population of children and older adults. A training plan was also conducted for handling staff involved in receiving, storing, packaging and distributing raw materials in a food distributor. The clean-up plan and training led to a 40 percent to 70 percent increase in compliance with best manufacturing practices (BPM). These results represent a solid basis for ensuring food safety and reducing the risk of acquiring FBI in the study population. This article also provides an outline for easily acquiring the necessary methodology for implementing a clean-up plan in a food industry.

Kinetic patterns of Candida albicans germ tube antibody in critically ill patients: influence on mortality.

The influence of kinetic patterns of Candida albicans germ tube antibodies (CAGTA) on mortality was analyzed in six intensive care units. Statistically significant lower mortality rates were found in patients with patterns of increasing CAGTA titers who had been treated with antifungal agents. Thus, antifungal treatment should be considered when CAGTA titers are increasing in critically ill patients.

Hormonal regulation of temperature-induced growth in Arabidopsis.

Successful plant survival depends upon the proper integration of information from the environment with endogenous cues to regulate growth and development. We have investigated the interplay between ambient temperature and hormone action during the regulation of hypocotyl elongation, and we have found that gibberellins (GAs) and auxin are quickly and independently recruited by temperature to modulate growth rate, whereas activity of brassinosteroids (BRs) seems to be required later on. Impairment of GA biosynthesis blocked the increased elongation caused at higher temperatures, but hypocotyls of pentuple DELLA knockout mutants still reduced their response to higher temperatures when BR synthesis or auxin polar transport were blocked. The expression of several key genes involved in the biosynthesis of GAs and auxin was regulated by temperature, which indirectly resulted in coherent variations in the levels of accumulation of nuclear GFP-RGA (repressor of GA1) and in the activity of the DR5 reporter. DNA microarray and genetic analyses allowed the identification of the transcription factor PIF4 (phytochrome-interacting factor 4) as a major target in the promotion of growth at higher temperature. These results suggest that temperature regulates hypocotyl growth by individually impinging on several elements of a pre-existing network of signaling pathways involving auxin, BRs, GAs, and PIF4.

[A sanitation plan for a food distributor attending children and the elderly]. / Plan de saneamiento para una distribuidora de alimentos que atiende a niños y adultos mayores.

The responsibility for providing healthy food involves all members of the production chain from input supplier to the distributor and consumer of food. Children and older adults represent the most vulnerable consumers for acquiring food-borne illness (FBI), meaning that the risk factors produced in food-processing targeted for this population group must be reduced. A clean-up plan was thus designed and implemented following the guideline laid down in decree 3075/1997 to reduce FBI risk factors in a population of children and older adults. A training plan was also conducted for handling staff involved in receiving, storing, packaging and distributing raw materials in a food distributor. The clean-up plan and training led to a 40 % to 70 % increase in compliance with best manufacturing practices (BPM). These results represent a solid basis for ensuring food safety and reducing the risk of acquiring FBI in the study population. This article also provides an outline for easily acquiring the necessary methodology for implementing a clean-up plan in a food industry.

The PsEND1 promoter: a novel tool to produce genetically engineered male-sterile plants by early anther ablation.

PsEND1 is a pea anther-specific gene that displays very early expression in the anther primordium cells. Later on, PsEND1 expression becomes restricted to the epidermis, connective, endothecium and middle layer, but it is never observed in tapetal cells or microsporocytes. We fused the PsEND1 promoter region to the cytotoxic barnase gene to induce specific ablation of the cell layers where the PsEND1 is expressed and consequently to produce male-sterile plants. Expression of the chimaeric PsEND1::barnase gene in two Solanaceae (Nicotiana tabacum and Solanum lycopersicon) and two Brassicaceae (Arabidopsis thaliana and Brassica napus) species, impairs anther development from very early stages and produces complete male-sterile plants. The PsEND1::barnase gene is quite different to other chimaeric genes previously used in similar approaches to obtain male-sterile plants. The novelty resides in the use of the PsEND1 promoter, instead of a tapetum-specific promoter, to produce the ablation of specific cell lines during the first steps of the anther development. This chimaeric construct arrests the microsporogenesis before differentiation of the microspore mother cells and no viable pollen grains are produced. This strategy represents an excellent alternative to generate genetically engineered male-sterile plants, which have proved useful in breeding programmes for the production of hybrid seeds. The PsEND1 promoter also has high potential to prevent undesirable horizontal gene flow in many plant species.

The pea END1 promoter drives anther-specific gene expression in different plant species.

END1 was isolated by an immunosubtractive approach intended to identify specific proteins present in the different pea (Pisum sativum L.) floral organs and the genes encoding them. Following this strategy we obtained a monoclonal antibody (mAbA1) that specifically recognized a 26-kDa protein (END1) only detected in anther tissues. Northern blot assays showed that END1 is expressed specifically in the anther. In situ hybridization and immunolocalization assays corroborated the specific expression of END1 in the epidermis, connective, endothecium and middle layer cells during the different stages of anther development. END1 is the first anther-specific gene isolated from pea. The absence of a practicable pea transformation method together with the fact that no END1 homologue gene exists in Arabidopsis prevented us from carrying out END1 functional studies. However, we designed functional studies with the END1 promoter in different dicot species, as the specific spatial and temporal expression pattern of END1 suggested, among other things, the possibility of using its promoter region for biotechnological applications. Using different constructs to drive the uidA (beta-glucuronidase) gene controlled by the 2.7-kb isolated promoter sequence we have proven that the END1 promoter is fully functional in the anthers of transgenic Arabidopsis thaliana (L.) Heynh., Nicotiana tabacum L. (tobacco) and Lycopersicon esculentum Mill. (tomato) plants. The presence in the -330-bp region of the promoter sequence of three putative CArG boxes also suggests that END1 could be a target gene of MADS-box proteins and that, subsequently, it would be activated by genes controlling floral organ identity.