Mechanistic Evaluation of Daphnia magna’s Behavioral and Life History Responses to Photoperiod
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PROVIDER: PRJNA481521 | ENA |
REPOSITORIES: ENA
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Project description:Across evolutionary time, nearly all animal species have harnessed photoperiod to initiate processes that ultimately influence seasonal behavior and life history traits. In the freshwater cladoceran Daphnia magna, the effect of photoperiod on various life history traits has generally been investigated in conjunction with additional environmental stimuli. In the present study, we sought to untangling responses directly attributable to photoperiod in D. magna and identify the molecular processes underlying resultant behavioral and life history responses using functional analysis of global transcriptomic expression. D. magna were exposed to five different photoperiods immediately post-hatch for 21d where a standard long-day photoperiod of 16 hours light and 8 hours dark (16L:8D) served as the control relative to 4L:20D, 8L:16D, 12L:12L, and 20L:4D photoperiods. Entrainment to short-day photo-periods (4L:20D, 8L:16D, and 12L:12L) resulted in significantly increased light-avoidance behaviors relative to the control photoperiod where young Daphnia (7d old) displayed the most pronounced avoidance responses. Correspondingly, functional transcriptomics identified differential transcriptional expression of genes involved in glutamate signaling, which is critical in arthropod light-avoidance responses, as well as period circadian protein and proteins coding F-box/LRR-repeat domains, all of which contribute to establishing circadian rhythms in arthropods. Short-day photoperiods also induced increased metabolic rates which corresponded with broad-scale changes in transcriptional expression across multiple systems-level energy metabolism pathways. The most striking observation was increased male production across short-day photoperiods (4L:20D, 8L:16D, and 12L:12D). Transcriptional expression consistent with multiple putative mechanisms of male production were observed including expression suggestive of increased glutamate signaling; a response observed to induce male production in D. pulex via photo-period sensitive mechanisms. Overall, the results demonstrate the importance of photoperiod on behavior and life history trajectories in D. magna where we have now established multiple putative mechanistic pathways underlying several critical responses.
2019-10-22 | GSE117243 | GEO
Project description:Across evolutionary time, nearly all animal species have harnessed photoperiod to initiate processes that ultimately influence seasonal behavior and life history traits. In the freshwater cladoceran Daphnia magna, the effect of photoperiod on various life history traits has generally been investigated in conjunction with additional environmental stimuli. In the present study, we sought to untangling responses directly attributable to photoperiod in D. magna and identify the molecular processes underlying resultant behavioral and life history responses using functional analysis of global transcriptomic expression. D. magna were exposed to five different photoperiods immediately post-hatch for 21d where a standard long-day photoperiod of 16 hours light and 8 hours dark (16L:8D) served as the control relative to 4L:20D, 8L:16D, 12L:12L, and 20L:4D photoperiods. Entrainment to short-day photo-periods (4L:20D, 8L:16D, and 12L:12L) resulted in significantly increased light-avoidance behaviors relative to the control photoperiod where young Daphnia (7d old) displayed the most pronounced avoidance responses. Correspondingly, functional transcriptomics identified differential transcriptional expression of genes involved in glutamate signaling, which is critical in arthropod light-avoidance responses, as well as period circadian protein and proteins coding F-box/LRR-repeat domains, all of which contribute to establishing circadian rhythms in arthropods. Short-day photoperiods also induced increased metabolic rates which corresponded with broad-scale changes in transcriptional expression across multiple systems-level energy metabolism pathways. The most striking observation was increased male production across short-day photoperiods (4L:20D, 8L:16D, and 12L:12D). Transcriptional expression consistent with multiple putative mechanisms of male production were observed including expression suggestive of increased glutamate signaling; a response observed to induce male production in D. pulex via photo-period sensitive mechanisms. Overall, the results demonstrate the importance of photoperiod on behavior and life history trajectories in D. magna where we have now established multiple putative mechanistic pathways underlying several critical responses.
2019-10-22 | GSE117242 | GEO
Project description:Mechanistic Evaluation of Daphnia magna’s Behavioral and Life History Responses to Photoperiod [Experiment 2]
| PRJNA481523 | ENA
Project description:Mechanistic Evaluation of Daphnia magna’s Behavioral and Life History Responses to Photoperiod [Experiment 1]
| PRJNA481524 | ENA
Project description:This SuperSeries is composed of the SubSeries listed below.
2019-10-21 | GSE117244 | GEO
Project description:7 daphnia magna life stages from embryo development till adult were profiled using a new custom made microarray on a 4*160K platform
2017-04-01 | GSE90810 | GEO
Project description:Daphnia (Daphnia pulex) is a small planktonic crustacean and a key constituent of aquatic ecosystems. It is commonly used as a model organism for studying environmental toxic challenges. In the past decade, a Daphnia genomic information and proteomic dataset has been developed. This dataset has expanded the opportunity to relate toxicological effects with “Daphnia proteomics” as it integrates proteomic knowledge in Daphnia, those approach will provide greater insights for toxicological research. In order to exploit Daphnia for ecotoxicological research, information on the post-translational modification (PTM) of proteins is necessary as this is a critical regulator of biological processes. Acetylation of lysine (Kac) is a reversible and highly regulated PTM that is associated with diverse biological functions. However, a comprehensive description of Kac in Daphnia is not yet available. Here, to understand the cellular distribution of lysine acetylation in Daphnia, we identified 98 acetylation sites in 65 proteins by immunoprecipitation using an anti-acetyllysine antibody and an liquid chromatography system supported by mass spectroscopy. We identified 28 acetylated sites connected with metabolic proteins and 6 acetylated enzymes associated with the TCA cycle in Daphnia. From GO and KEGG enrichment analyses, we showed that Kac in D. pulex is highly enriched in proteins associated with metabolic processes. Our data provide the first global analysis of lysine acetylation in D. pulex. The expanded proteomic dataset will be an important resource for the functional analysis of Kac in D. pulex and it will be nice to have a first step done using a promising future model organism.
2016-01-05 | PXD002441 | Pride
Project description:This experiment was conducted to study the short-term (12h) transcriptional responses in Daphnia magna after exposure to the anti-sea lice chemical emamectin benzoate (EMB). The microarray results were further vefiried using qPCR. The gene exression responses were linked to adverse effects after 48h exposure, in order to supply knowledge for environmental hazard assessment of this chemical in non-target crustaceans. Neonatal (<24h) Daphnia magna were exposed to 7.8-2000 pM waterborne emamectin benzoate for 12h. Microarray analysis was performed using pooled whole-organism D. magna (8 individuals) and 4 biological replicates were analyzed for each treatment group.
2016-06-30 | E-GEOD-83859 | biostudies-arrayexpress
Project description:The US Department of Defense (DOD) is developing insensitive munitions (IMs) that are resistant to unintended detonation to protect warfighters. To enable evaluation of the material life-cycle for the IM, 1-methyl-3-nitro-1-nitroguanidine (MeNQ), ecotoxicological impacts assessment was required. A previous investigation of MeNQ exposures in Daphnia pulex revealed concentration-responsive decreases in reproduction relative to controls (0 mg/L) across a 174, 346, 709, 1385, and 2286 mg/L exposure range. The present study used those exposures to conduct global transcriptomic expression analyses to establish hypothetical mechanisms underlying inhibited reproduction. Changes in transcript expression tended to increase with increasing MeNQ concentration where hierarchical clustering analysis identified separation among the “low” (174 and 346 mg/L) and “high” (709, 1385, and 2286 mg/L) exposures. The MeNQ exposures significantly decreased transcriptional expression for a vitellogenin precursor and juvenile hormone-inducible protein, each having plausible mechanistic connections to impaired reproductive physiology and reduced offspring production in Daphnia. Further, MeNQ affected chorion peroxidase and high choriolytic enzyme transcriptional expression which are known to influence egg production / maturation processes in arthropods. Additionally, MeNQ exposure caused dose-responsive decreases in transcriptional expression for a diverse set of cuticle proteins which requires closer examination regarding Daphnia embryo development and brood release. Finally, canonical-pathway enrichment analysis identified significant effects on a broad array of energy metabolic processes in D. pulex which require consideration regarding potential shifts in homeostatic equilibrium that can have indirect costs on reproduction. Overall, plausible mechanisms of inhibited D. pulex reproduction have been identified and should be tested in targeted bioassays. see previous row.
2021-06-14 | GSE164957 | GEO
Project description:Microcrustacean Daphnia is becoming a model organism of choice for ecological and developmental genomics. Yet, Daphnia proteomics resources have so far been rudimental. This study presents LC-MS2/SPS-MS3 proteomes of adult females, juveniles, asexually produces embryos and sexually produced diapausing embryos capable of surviving freezing and desiccation. Samples were fractionated using high pH reversed-phase chromatography. 12 farctions were analyzed by LC-MS2/SPS-MS3.
The samples are labeled as follows:
E1 (128n), E2 (128c), E3 (129n); 3 biological replicates of asexually produced embryos
J1 (127n), J2 (127c), J3 (131n); 3 biological replicates of juveniles
M1 (129c), M2 (130n), M3 (130c); 3 biological replicates of adult females
Eph (126); a single ephippium sample (sexually produced diapausing embryos).
2019-04-22 | MSV000083711 | MassIVE