Orbicella faveolata
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PROVIDER: PRJNA131891 | ENA |
REPOSITORIES: ENA
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Project description:Scleractinian corals are the major builders of the complex structural framework of coral reefs. They live in tropical waters around the globe where they are frequently exposed to potentially harmful ultraviolet radiation (UVR). Coral eggs and early embryonic stages are thought to be the most sensitive life stages of corals to UVR given that they are highly buoyant and remain near the sea surface for prolonged periods of time. Here we analyzed gene expression changes in different larval stages of the Caribbean coral Montastraea faveolata to natural levels of UVR using high-density cDNA microarrays (10,930 clones). We found that larvae exhibit low sensitivity to natural levels of UVR during most time points analyzed as reflected by comparatively few transcriptomic changes in response to UVR. However, we identified a time window of high UVR sensitivity that coincides with the motile planula stage and the onset of larval competence. These processes have been shown to be affected upon UVR exposure, and the transcriptional changes we identified explain these observations well. Our analysis of differentially expressed genes indicates that UVR induces a stress response and affects the expression of neurogenesis-related genes that can be linked to swimming and settlement behavior at later stages. Taken together, our study provides further data to the impact of natural levels of UVR on coral larvae. Furthermore, our results might allow a better prediction of settlement and recruitment rates after coral spawning events based on UVR climate data.
2011-05-15 | GSE24949 | GEO
Project description:Scleractinian corals are the major builders of the complex structural framework of coral reefs. They live in tropical waters around the globe where they are frequently exposed to potentially harmful ultraviolet radiation (UVR). Coral eggs and early embryonic stages are thought to be the most sensitive life stages of corals to UVR given that they are highly buoyant and remain near the sea surface for prolonged periods of time. Here we analyzed gene expression changes in different larval stages of the Caribbean coral Montastraea faveolata to natural levels of UVR using high-density cDNA microarrays (10,930 clones). We found that larvae exhibit low sensitivity to natural levels of UVR during most time points analyzed as reflected by comparatively few transcriptomic changes in response to UVR. However, we identified a time window of high UVR sensitivity that coincides with the motile planula stage and the onset of larval competence. These processes have been shown to be affected upon UVR exposure, and the transcriptional changes we identified explain these observations well. Our analysis of differentially expressed genes indicates that UVR induces a stress response and affects the expression of neurogenesis-related genes that can be linked to swimming and settlement behavior at later stages. Taken together, our study provides further data to the impact of natural levels of UVR on coral larvae. Furthermore, our results might allow a better prediction of settlement and recruitment rates after coral spawning events based on UVR climate data. Gamete capture and larval rearing Montastraea faveolata gametes were captured and reared as described in Voolstra et al. 2009 (2009a). Briefly, gametes from 10 colonies were captured during a spawning event on the night of the 10th of September 2009 at approximately 22:00 hours using collecting nets attached to plastic enclosures at “La Bocana Chica” (20º50´N, 86º52´W) located in the “Parque Nacional Arrecife de Puerto Morelos”. Within 10 minutes the gametes were brought to the research vessel “Carybdea”, where they were placed in 5 µm filtered sea water (FSW), large zooplankton was removed, and the egg-sperm mixture was mixed gently to enhance the process of fertilization during transportation to the research station (Unidad Académica Puerto Morelos). After 1 hour, the egg-sperm mixture was repeatedly washed with 5 µm FSW to ensure that all unused sperm and remaining zooplankton were removed. The embryos were placed in round, bottomless, incubation bins fitted with 100 µm mesh, which were housed in abundant 5 µm FSW. Fertilization success, measured 6 hours after the washing procedure, was estimated at 95% by counting the number of eggs undergoing division as a proportion of the total number of eggs (dividing + non-dividing). Experimental procedure After 12 hours, the majority of the embryos were in the late blastula stage. A subsample of embryos was taken from different incubation bins and divided into twelve 1 liter containers with 5 µm FSW added to the brim. Each container held approximately 3,000 embryos. All of the containers were placed in 800 L fiber glass aquaria filled with flowing sea water and exposed to natural solar radiation from 9am to 3pm (6h) at 29ºC and 3.5% salinity. Six of the containers were placed under a sheet of 6mm thick Plexiglass G UVT that has a full width at half maximum (FWHM) at 282 nm and is therefore transparent to UVR. The other six containers were placed under a sheet of 4 mm thick Plexiglass G UF-3 that has a FWHM at 390 nm and is therefore opaque to UVR. At the end of the exposure period, the embryos were harvested and preserved in RNAlater (Ambion), placed at 4ºC for 24 hours to ensure infiltration of the fixative and frozen at -80ºC until further processing. The same exposure and fixation procedures were repeated on 36 hours old embryos (late gastrula stage), on 60 hours old non-motile, floating larvae, on 84 hours old motile planulae, and on 132 hours old planulae that are motile, diving, and ready for settlement.
2011-05-15 | E-GEOD-24949 | biostudies-arrayexpress
Project description:Effects of temperature on gene expression in coral larvae of Montastraea faveolata
| PRJNA114789 | ENA
Project description:Gene expression analysis during metamorphosis and the onset of calcification in the scleractinian coral M. faveolata
| PRJNA115373 | ENA
Project description:Location-specific responses to thermal stress in larvae of the reef-building coral Montastraea faveolata
| PRJNA120165 | ENA
Project description:The extraction of tissue-skeleton cores from coral colonies is a common procedure to study diverse aspects of their biology, water quality or to obtain environmental proxies. Coral species preferred for such studies in Caribbean reefs belong to the genera Orbicella. The long term effects of coring in the coral colony are seldom evaluated and in many Caribbean countries this practice is not regulated. We monitored 50 lesions produced on Orbicella faveolata colonies by the extraction of two centimeter-diameter cores to determine if they were able to heal after a four year period. At the end of the study 4% of the lesions underwent full regeneration, 52% underwent partial regeneration, 14% suffered additional tissue loss but remained surrounded by live tissue, and 30% merged with dead areas of the colonies. Given the low capacity of Orbicella faveolata to regenerate tissue-skeleton lesions, studies that use coring should be regulated and mitigation actions, such as using less destructive techniques and remediation measures after extraction, should be conducted to facilitate tissue regeneration.
| S-EPMC4800412 | biostudies-literature
Project description:Ultraviolet radiation (UVR) is the greatest risk factor for melanoma development. While the role of UVR in DNA mutagenesis is generally accepted, the role of UVR-induced mutations in melanomagenesis remains controversial. To understand better how UVR is contributing to melanoma development, we investigated the non-mutational effect of UVR on the epigenome, specifically DNA methylation. Aberrant DNA methylation changes are a hallmark in melanoma and there are few reports on the effects of UVR on DNA methylation. We exposed melanocytes to UVR and cultured them for one-month to detect heritable and stable changes in DNA methylation. We found both hyper and hypo methylated sites after UVR exposure. While many of these changes occurred outside of promoters and areas of active gene expression, there were changes in promoter DNA methylation changes that correlated with changes in gene expression. These changes also correlated with those found in melanoma and UVR sensitive sites were prognostic of patient overall survival. Our work shows UVR-induced DNA methylation changes in melanocytes and may be a novel non-mutational mechanism in which UVR contributes to melanoma development.
2024-03-25 | GSE169695 | GEO
Project description:Outbreaks of coral diseases continue to reduce global coral populations. In the Caribbean, yellow band is a severe and wide-spread disease that commonly affects corals of the Orbicella spp. complex, significantly impeding coral reproduction, and hindering the natural recovery of Orbicella spp. POPULATIONS:Caribbean yellow-band disease (CYBD) lesions may be severe, and often result in the complete loss of coral tissue. The slow spread of CYBD, however, provides an opportunity to test methods to mitigate the disease. Here we report the results of in situ experiments, conducted within Buck Island Reef National Monument in St. Croix, USVI, to test the effectiveness of three techniques to minimize disease impact on Orbicella faveolata: (1) shading, (2) aspirating, and (3) chiseling a "firebreak" to isolate the lesion. Neither shading nor aspirating the diseased tissue significantly reduced CYBD tissue loss. However, chiseling reduced the rate and amount of tissue lost by 31%. While 30-40% of the chiseled lesions appeared to be free of disease signs 12-16 months after treatment, success significantly and steadily declined over 23 months, indicating a possible lack of long-term viability of the technique. The results of this study demonstrate that creating a "firebreak" between diseased and healthy-appearing tissue slows the spread of the disease and may prolong the life of O. faveolata colonies. The firebreak method yielded the best results of all the techniques tested, and also required the least amount of effort and resources. However, we do not recommend that this treatment alone be used for long-term disease mitigation. Rather, we propose that modifications of this and other treatment options be sought. The results also highlight the need for extended monitoring of CYBD after any treatment, due to the slow but variable rate and pattern of tissue loss in this disease.
| S-EPMC5951125 | biostudies-literature
Project description:Urocanic acid (UCA) is a major epidermal chromophore that undergoes trans to cis photoisomerisation following exposure to solar ultraviolet radiation (UVR). Although there is considerable evidence that cis-UCA suppresses cell-mediated immune response in mouse skin, the molecular events are not fully understood. In this study, we examined involvement of gene transcription in the immunomodulatory effects of cis-UCA on primary human keratinocytes. The results showed that about 400 genes were induced by UVR, 16 of which also up-regulated by cis-UCA. In contrast, trans-UCA had no effect on gene expression. The genes up-regulated by both cis-UCA and UVR were associated with apoptosis, cell growth arrest, cytokines and oxidative stress. Experiment Overall Design: RNA was extracted from primary human keratinocytes treated with trans-, cis-UCA (10ug/ml) or solar simulated UVR (12J/cm2 ~ 2-3 minimal erythema doses for fair skin), or untreated. At 24hr, the transcriptional profiles were assessed by Affymetrix HG-U133A microarray.
2008-11-06 | E-GEOD-8760 | biostudies-arrayexpress
Project description:The genetic composition of the resident Symbiodinium endosymbionts can strongly modulate the physiological performance of reef-building corals. Here, we used quantitative metabarcoding to investigate Symbiodinium genetic diversity in two species of mountainous star corals, Orbicella franksi and Orbicella faveolata, from two reefs separated by 19 km of deep water. We aimed to determine if the frequency of different symbiont genotypes varied with respect to coral host species or geographic location. Our results demonstrate that across the two reefs both coral species contained seven haplotypes of Symbiodinium, all identifiable as clade B and most closely related to type B1. Five of these haplotypes have not been previously described and may be endemic to the Flower Garden Banks. No significant differences in symbiont composition were detected between the two coral species. However, significant quantitative differences were detected between the east and west banks for three background haplotypes comprising 0.1%-10% of the total. The quantitative metabarcoding approach described here can help to sensitively characterize cryptic genetic diversity of Symbiodinium and potentially contribute to the understanding of physiological variations among coral populations.
| S-EPMC4034615 | biostudies-literature