Ocean Sampling Day
Ontology highlight
ABSTRACT:
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| ERR770958_merged.fastq.gz | Fastqsanger.gz | |||
| ERR770959_merged.fastq.gz | Fastqsanger.gz | |||
| ERR770960_merged.fastq.gz | Fastqsanger.gz | |||
| ERR770961_merged.fastq.gz | Fastqsanger.gz | |||
| ERR770962_merged.fastq.gz | Fastqsanger.gz |
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Project description:Despite its demonstrated biological significance, time of day is a broadly overlooked biological variable in preclinical and clinical studies. How time of day affects the influence of peripheral tumors on central (brain) function remains unspecified. Thus, we tested the hypothesis that peripheral mammary cancer tumors alter the transcriptome of immune responses in the brain and that these responses vary based on time of day; we predicted that time of day sampling bias would alter the interpretation of the results. Brain tissues collected at mid dark and mid light from mammary tumor-bearing and vehicle injected mice were analyzed using the Nanostring nCounter Mouse Neuroinflammation Panel V1. Peripheral mammary tumors significantly affected expression within the brain of over 100 unique genes of the 770 represented in the panel, and fewer than 25% of these genes were affected similarly across the day. Indeed, between 65-75% of GO biological processes represented by the differentially expressed genes were dependent upon time of day of sampling. The implications of time-of-day sampling bias in interpretation of research studies cannot be understated. We encourage considering time of day as a significant biological variable in studies and to appropriately control for it and clearly report time of day in findings.
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Project description:Marine cyanobacteria are thought to be the most sensitive of the phytoplankton groups to copper toxicity, yet little is known of the transcriptional response of marine Synechococcus to copper shock. Global transcriptional response to two levels of copper shock was assayed in both a coastal and an open ocean strain of marine Synechococcus using whole genome expression microarrays. Both strains showed an osmoregulatory-like response, perhaps as a result of increasing membrane permeability. This could have implications for marine carbon cycling if copper shock leads to dissolved organic carbon leakage in Synechococcus. The two strains additionally showed a reduction in photosynthetic gene transcripts. Contrastingly, the open ocean strain showed a typical stress response whereas the coastal strain exhibited a more specific oxidative or heavy metal type response. In addition, the coastal strain activated more regulatory elements and transporters, many of which are not conserved in other marine Synechococcus strains and may have been acquired by horizontal gene transfer. Thus, tolerance to copper shock in some marine Synechococcus may in part be a result of an increased ability to sense and respond in a more specialized manner.
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Project description:In recent years, increasing levels of dissolved carbon dioxide in seawater have led to an increase of ocean acidification (OA), which constitutes a major threat to marine ecosystems. As an important economically marine bivalve, Mactra veneriformis is highly susceptible to ocean acidification. In this study, we recorded and observed the mortality rate, oxygen consumption rate and ammonia excretion rate of different shell colour groups of M. veneriformis under the stress of ocean acidification (pH=7.6), and conducted transcriptome analysis of the mantle tissues of M. veneriformis with white and purple shell colours in the acidified group (pH=7.6) and the control group (pH=8.1) under the two conditions, which showed that there was a significant difference in mortality rate between the acidified group and the control group at day 30, but there was a significant difference in mortality rate between the white colors group and the purple colors group at day 30, which was not significant. The results showed that there was a significant difference in mortality between the acidified and control groups at day 30, but the difference in mortality between the white and purple shell colour groups at day 30 was not significant. In the transcriptome analysis, fatty acid synthase gene was up-regulated in two shell colours of M. veneriformis under acidification stress, which may be a molecular compensatory mechanism to reduce the susceptibility of organisms to oxidative damage of lipids; tyrosinase gene was up-regulated, which may be a compensatory mechanism of Tyr's regulatory mechanism to the formation of shell damages under acidification; carbonic anhydrase gene was up-regulated in the purple group of M. veneriformis under acidification stress, which may be a compensatory mechanism for the acidity of M. veneriformis to cope with environmental stress; the white group of M. veneriformis under acidification stress was up-regulated. The carbonic anhydrase gene was up-regulated in the purple group under acidification stress, which may be an acidity compensation mechanism of M. veneriformis in response to the environmental stress.
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Project description:Marine microbial communities are critical for biogeochemical cycles and the productivity of ocean ecosystems. Primary productivity, at the base of marine food webs, is constrained by nutrient availability in the surface ocean, and nutrient advection from deeper waters can fuel photosynthesis. In this study, we compared the transcriptional responses by surface microbial communities after experimental deep water mixing to the transcriptional patterns of in situ microbial communities collected with high-resolution automated sampling during a bloom in the North Pacific Subtropical Gyre. Transcriptional responses were assayed with the MicroTOOLs (Microbiological Targets for Ocean Observing Laboratories) marine environmental microarray, which targets all three domains of life and viruses. The experiments showed that mixing of deep and surface waters substantially affects the transcription of photosystem and nutrient response genes among photosynthetic taxa within 24 hours, and that there are specific responses associated with the addition of deep water containing particles (organisms and detritus) compared to filtered deep water. In situ gene transcription was most similar to that in surface water experiments with deep water additions, showing that in situ populations were affected by mixing of nutrients at the six sampling sites. Together, these results show the value of targeted metatranscriptomes for assessing the physiological status of complex microbial communities.
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