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Neocalanus flemingeri

ABSTRACT: Response to food availability in pre-adult Neocalanus flemingeri

PROVIDER: PRJNA807352 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR18063300_1.fastq.gz	Fastqsanger.gz
	SRR18063300_2.fastq.gz	Fastqsanger.gz
	SRR18063301_1.fastq.gz	Fastqsanger.gz
	SRR18063301_2.fastq.gz	Fastqsanger.gz
	SRR18076209_1.fastq.gz	Fastqsanger.gz

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Neocalanus flemingeri

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Regional heterogeneity impacts gene expression in the subarctic zooplankter <i>Neocalanus flemingeri</i> in the northern Gulf of Alaska.

Project description:Marine pelagic species are being increasingly challenged by environmental change. Their ability to persist will depend on their capacity for physiological acclimatization. Little is known about limits of physiological plasticity in key species at the base of the food web. Here we investigate the capacity for acclimatization in the copepod Neocalanus flemingeri, which inhabits the Gulf of Alaska, a heterogeneous and highly seasonal environment. RNA-Seq analysis of field-collected pre-adults identified large regional differences in expression of genes involved in metabolic and developmental processes and response to stressors. We found that lipid synthesis genes were up-regulated in individuals from Prince William Sound and down-regulated in the Gulf of Alaska. Up-regulation of lipid catabolic genes in offshore individuals suggests they are experiencing nutritional deficits. The expression differences demonstrate physiological plasticity in response to a steep gradient in food availability. Our transcriptional analysis reveals mechanisms of acclimatization that likely contribute to the observed resilience of this population.

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Project description:RNA-seq of liver of mice exposed to varying food availability

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Project description:The adaptable transcriptional response to changes in food availability not only ensures animal survival, but also permits progressing with embryonic development. Interestingly, the central nervous system is preferentially protected to periods of malnutrition, a phenomenon known as ‘brain sparing’. However, the mechanisms that mediates this genetic response remains poorly understood. To get a better understanding of this, we used Drosophila melanogaster as a genetic model, analysing the transcriptional response of larval neural stem cells (neuroblasts) and glial cells of the blood-brain barrier during nutrient restriction using the targeted DamID technique.

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Development of gene expression profile for a seasonal variation study in a natural population of Riba-Roja, in the Ebro River, Spain

Project description:To analyze the impact of seasonal and environmental variations on the physiology and metabolism of zebramussel, we use a custom microarray developed in our laboratory, using 4057 publicly availabe DNA sequences from Dreissena and other realted genera. Transcriptome profiles were analyszed using half-body samples captured in Riba Roja (low Ebro River), a location considered relatively free of chemical pollution, at three different stages of the vital cycle. The results showed a clear separation on transcriptome profiles between samples collected in February and June (pre- and spawning, respectively) and samples collected during gonad resorption (September). A total of 753 transcripts changed significantly their mRNA levels during these three months (ANOVA p<0.01, fc ±1.5). These changes could be considered as response to variations of temperature, reproductive stages, as well as food availability. Genes involved in oxidative stress were overrepresented in September, whereas genes related to reproductive functions were overrrepresented in the spawning and pre-spawning period. For each season (February: pre-spawning; June: Spawning; September: gonad resorption) it was used 2 biological replicates using the half body as a target tissue to analyze .

2012-01-27 | E-GEOD-35353 | biostudies-arrayexpress

Development of gene expression profile for a seasonal variation study in a natural population of Riba-Roja, in the Ebro River, Spain

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Expression of the placental transcriptome in fetal growth restriction in the Baboon is Dependent on Fetal Sex

Project description:Fetal growth restriction (FGR) develops when fetal nutrient availability is compromised and increases the risk for perinatal complications and predisposes for offspring obesity, diabetes and cardiovascular disease later in life. Emerging evidence implicates changes in placental function in altered fetal growth and the subsequent development of adult disease. The susceptibility for disease in response to an adverse intrauterine environment differs distinctly between boys and girls, with girls typically having better outcomes. Here, we test the hypothesis that regulation of the placental transcriptome by moderate nutrient reduction is dependent on fetal sex. We used a non-human primate model of FGR in which maternal global food intake is reduced by 30% starting at gestational day (GD) 30. At GD 165 (term = GD 183) placental genome expression profiling was carried out followed by bioinformatics including pathway and network analysis. Surprisingly, there was no coordinated placental molecular response to decreased nutrient availability when analyzing the data without accounting for fetal sex. In contrast, female placentas exhibited a highly coordinated response that included up-regulation of genes in networks, pathways and functional groups related to programmed cell death and down-regulation of genes in networks, pathways and functional groups associated with cell proliferation. These changes were not apparent in the male placentas. Our data support the concept that female placentas initiate complex adaptive responses to an adverse intrauterine environment, which may contribute to increased survival and better pregnancy outcomes in girls. Total RNA obtained from 165dGA control female (n=3), control male (n=3), nutrient restricted female (n=3), and nutrient restricted male (n=3) pregnancies.

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