A parasitoid overcomes collective defense by silencing host communication

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1. Apparenté Contexte plus large Pas pertinent

   The role of parasite-produced dopamine in Toxoplasma gondii-altered host behaviour

   Beatriz Calvo-Urbano, Maya Kaushik, An-Chi Cheng et al. · 2025 · Nature Communications · cité 2 fois · Résumé IA disponible

   L’étude examine la dopamine produite par Toxoplasma gondii comme mécanisme de modification du comportement d’hôtes, plutôt que la suppression des signaux d’alarme des pucerons.

   Résumé scientifique

   Abstract Certain parasites appear to manipulate their host’s behaviour for their own selective benefit. The mechanisms behind such behavioural alterations in vertebrate hosts remain elusive, despite their profound implications, particularly for those parasites with a broad host range. Toxoplasma gondii , the causative agent of the globally important toxoplasmosis, is a canonical example for parasite-altered behaviour in its rodent intermediate host. Such behavioural alterations, from subtle to severe, are also displayed across a broad spectrum of infected secondary hosts, including humans. Dopamine dysregulation has been proposed as one potential mechanistic explanation. Furthermore, T. gond…

2. Apparenté Contexte plus large Pas pertinent

   Mathematical model of plant-virus interactions mediated by RNA interference

   G. Neofytou, Y. N. Kyrychko, K. B. Blyuss · 2016 · J. Theor. Biol. 403, 129-142 (2016) · cité 19 fois · Résumé IA disponible

   Le modèle décrit l’interférence ARN dans les interactions entre virus végétaux, tandis que l’étude utilise l’ARN interférent pour tester des protéines du venin parasitoïde.

   Résumé scientifique

   Cross-protection, which refers to a process whereby artificially inoculating a plant with a mild strain provides protection against a more aggressive isolate of the virus, is known to be an effective tool of disease control in plants. In this paper we derive and analyse a new mathematical model of the interactions between two competing viruses with particular account for RNA interference. Our results show that co-infection of the host can either increase or decrease the potency of individual infections depending on the levels of cross-protection or cross-enhancement between different viruses. Analytical and numerical bifurcation analyses are employed to investigate the stability of all stead…

3. Apparenté Contexte plus large Pas pertinent

   Increased adaptive immune responses and proper feedback regulation protect against clinical dengue

   Etienne Simon-Loriere, Veasna Duong, Ahmed Tawfik et al. · 2017 · Science Translational Medicine, American Association for the Advancement of Science, 2017, 9 (405), pp.eaal5088 · cité 82 fois · Résumé IA disponible

   L’étude compare les réponses immunitaires humaines face à la dengue, sans examiner la manipulation de la communication collective des hôtes par un parasitoïde.

   Résumé scientifique

   Dengue is the most prevalent arthropod-borne viral disease. Clinical symptoms of dengue virus (DENV) infection range from classical mild dengue fever to severe, life-threatening dengue shock syndrome. However, most DENV infections cause few or no symptoms. Asymptomatic DENV-infected patients provide a unique opportunity to decipher the host immune responses leading to virus elimination without negative impact on t v 'health. We used an integrated approach of transcriptional profiling and immunological analysis comparing a Cambodian population of strictly asymptomatic viremic individuals with clinical dengue patients. Whereas inflammatory pathways and innate immune responses were similar betw…

4. Apparenté Contexte plus large Pas pertinent

   Mathematical Modeling of CRISPR-CAS system effects on biofilm formation

   Qasim Ali, Lindi Wahl · 2016 · Populations and Evolution · cité 6 fois · Résumé IA disponible

   Le modèle relie les systèmes CRISPR-Cas au comportement collectif bactérien, tandis que l’étude porte sur la suppression des alarmes chez les pucerons.

   Résumé scientifique

   Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR), linked with CRISPR associated (CAS) genes, play a profound role in the interactions between phage and their bacterial hosts. It is now well understood that CRISPR-CAS systems can confer adaptive immunity against bacteriophage infections. However, the possibility of failure of CRISPR immunity may lead to a productive infection by the phage (cell lysis) or lysogeny. Recently, CRISPR-CAS genes have been implicated in changes to group behaviour, including biofilm formation, of the bacterium Pseudomonas aeruginosa when lysogenized. For lysogens with a CRISPR system, another recent experimental study suggests that bacteriophage re…

5. Apparenté Contexte plus large Pas pertinent

   Nutritional Regulation Influencing Colony Dynamics and Task Allocations in Social Insect Colonies

   Feng Rao, Marisabel Rodriguez Messan, Angelica Marquez et al. · 2020 · Populations and Evolution · cité 3 fois · Résumé IA disponible

   Le modèle traite de nutrition, de dynamique et de répartition des tâches dans les colonies d’insectes, non de communication d’alarme perturbée par un parasitoïde.

   Résumé scientifique

   In this paper, we use an adaptive modeling framework to model and study how nutritional status (measured by the protein to carbohydrate ratio) may regulate population dynamics and foraging task allocation of social insect colonies. Mathematical analysis of our model shows that both investment to brood rearing and brood nutrition are important for colony survival and dynamics. When division of labor and/or nutrition are in an intermediate value range, the model undergoes a backward bifurcation and creates multiple attractors due to bistability. This bistability implies that there is a threshold population size required for colony survival. When the investment in brood is large enough or nutri…

6. Apparenté Contexte plus large Pas pertinent

   Adversarial Impacts on Autonomous Decentralized Lightweight Swarms

   Shaya Wolf, Rafer Cooley, Mike Borowczak · 2020 · Multiagent Systems · cité 1 fois · Résumé IA disponible

   L’étude analyse comment des influences externes compromettent la coordination de drones en essaim, plutôt que la défense collective d’insectes.

   Résumé scientifique

   The decreased size and cost of Unmanned Aerial Vehicles (UAVs) and Unmanned Ground Vehicles (UGVs) has enabled the use of swarms of unmanned autonomous vehicles to accomplish a variety of tasks. By utilizing swarming behaviors, it is possible to efficiently accomplish coordinated tasks while minimizing per-drone computational requirements. Some drones rely on decentralized protocols that exhibit emergent behavior across the swarm. While fully decentralized algorithms remove obvious attack vectors their susceptibility to external influence is less understood. This work investigates the influences that can compromise the functionality of an autonomous swarm leading to hazardous situations and …

7. Apparenté Contexte plus large Pas pertinent

   The dual role of constructive agents in public goods games: limited alone, amplifying cooperation with destructive agents

   Yuting Dong, Zhixue He, Chen Shen et al. · 2024 · Physics and Society · cité 3 fois · Résumé IA disponible

   L’article modélise les effets d’agents constructifs et destructeurs sur la coopération dans des jeux de biens publics, sans étudier des hôtes ou parasitoïdes.

   Résumé scientifique

   Recent studies have revealed a paradoxical phenomenon in public goods games, wherein destructive agents, harming both cooperators and defectors, can unexpectedly bolster cooperation. Building upon this intriguing premise, our paper introduces a novel concept: constructive agents, which confer additional benefits to both cooperators and defectors. We investigate the impact of these agents on cooperation dynamics within the framework of public goods games. Employing replicator dynamics, we find that unlike destructive agents, the mere presence of constructive agents does not significantly alter the defective equilibrium. However, when the benefits from constructive agents are outweighed by the…

8. Apparenté Contexte plus large Pas pertinent

   Competition, trait-mediated facilitation, and the structure of plant-pollinator communities

   Tomás A. Revilla, Vlastimil Křivan · 2017 · Journal of Theoretical Biology. Vol. 440, pp. 42-57 (2018) · cité 14 fois · Résumé IA disponible

   Le modèle étudie comment l’adaptation des préférences des pollinisateurs modifie la coexistence des communautés, plutôt que la perturbation de signaux d’alarme.

   Résumé scientifique

   In plant-pollinator communities many pollinators are potential generalists and their preferences for certain plants can change quickly in response to changes in plant and pollinator densities. These changes in preferences affect coexistence within pollinator guilds as well as within plant guilds. Using a mathematical model, we study how adaptations of pollinator preferences influence population dynamics of a two-plant-two-pollinator community interaction module. Adaptation leads to coexistence between generalist and specialist pollinators, and produces complex plant population dynamics, involving alternative stable states and discrete transitions in the plant community. Pollinator adaptation…