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Early life stress leads to gene expression down-regulation in prefrontal cortex [RNA-seq]

ABSTRACT: Early life stress leads to gene expression down-regulation in prefrontal cortex [RNA-seq]

PROVIDER: PRJNA641512 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR12074628_1.fastq.gz	Fastqsanger.gz
	SRR12074628_2.fastq.gz	Fastqsanger.gz
	SRR12074629_1.fastq.gz	Fastqsanger.gz
	SRR12074629_2.fastq.gz	Fastqsanger.gz
	SRR12074630_1.fastq.gz	Fastqsanger.gz

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Early life stress leads to gene expression down-regulation in prefrontal cortex

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Early life stress leads to gene expression down-regulation in prefrontal cortex [microarray]

Project description:Early life stress (ELS) is associated with adverse mental health outcomes including anxiety, depression and addiction-like behaviours. While ELS is known to affect the developing brain by leading to increased stress responsiveness and increased glucocorticoid levels, the molecular mechanisms underlying the detrimental effects of ELS remain incompletely characterised. Rodent models have been instrumental in beginning to uncover the molecular and cellular underpinnings of ELS. Limited nesting (LN), an ELS behavioural paradigm with significant improvements over maternal separation, mimics human maternal neglect. We have previously shown that LN leads to anxiety like-behaviours in rats. Here we assessed gene expression changes induced by ELS in rat prefrontal cortex by RNA-sequencing. We show that LN leads primarily to transcriptional repression and identify a molecular signature of LN in rat PFC that is robust to the behavioural paradigm and replicable across rodent species (mouse and rat).

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Project description:Early-life stress has been linked to multiple neurodevelopmental and neuropsychiatric deficits. Our previous studies have linked maternal presence/absence from the nest in developing rat pups to changes in prefrontal cortex activity. Furthermore, we have shown that these changes are modulated by serotonergic signaling. Here we test whether changes in prefrontal cortex activity during early-life affect the developing cortex leading to behavioral alterations in the adult. We show that inhibiting the prefrontal cortex of mouse pups leads to cognitive deficits in the adult comparable to those seen following maternal separation. Moreover, we show that activating the prefrontal cortex during maternal separation can prevent these behavioral deficits. To test how maternal separation affects the transcriptional profile of the prefrontal cortex we performed single-nucleus RNA sequencing. Maternal separation lead to differential gene expression almost exclusively in inhibitory neurons. Among others, we found changes in GABAergic and serotonergic pathways in these interneurons. Interestingly, both maternal separation and early-life prefrontal cortex inhibition led to changes in physiological responses in prefrontal activity to GABAergic and serotonergic antagonists that were similar to the responses of more immature brains. Prefrontal activation during maternal separation prevented these changes. These data point to a crucial role of prefrontal cortex activity during early-life in behavioral expression in adulthood

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Early life stress leads to gene expression down-regulation in prefrontal cortex

Project description:This SuperSeries is composed of the SubSeries listed below.

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Rat prefrontal cortex LC-MS/MS

Project description:The prefrontal cortex is greatly associated with a wide range of mental health illnesses including schizophrenia, depression, bipolar disorder, anxiety and autism spectrum disorders. It richly expresses neuroreceptors which are the target for typical and atypical antipsychotics. However as the precise mechanism of action of antipsychotic medications are not known, proteomic studies of the effects of antipsychotic drugs on the brain are warranted. In the current study we aimed to characterise protein expression in the adult rodent prefrontal cortex (n=5 per group) following low dose treatment with the atypical antipsychotic Risperidone or saline (control) in adolescence (postnatal days 34-47). The prefrontal cortex was examined by triplicate one hour runs of label-free LC-MS/MS. The raw mass spectral data were analyzed with the MaxQuantTM software. Statistical analysis was carried out using SAS Version 9.1. Functional and pathway analysis was performed with DAVID.nih and Ingenuity Pathway Analysis respectively and the top five most implicated pathways were found to be clathrin mediated endocytosis, the tri cyclic acid cycle, remodelling of epithelial junctions, rho family GTPase signalling and mitochondrial dysfunction.This brief report summarises the proteomic data obtained from the study described, adds to the current repertoire of data available concerning the effects of atypical antipsychotic drugs on the brain and sheds light on their biological mechanisms.

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Project description:Fresh frozen post mortem prefrontal cortex tissue (Brodman area 46) was obtained from 44 individuals varying in age from 0 to 49 years. RNA was extracted from these samples and hybridized to HG133plus2.0 GeneChips. The data was used to examine patterns of gene expression over the course of human postnatal developmental and ageing. PMI - postmortem interval, DLPFC - dorsolateral prefrontal cortex Experiment Overall Design: The dataset consists of 44 individuals varying in age from 0 to 49 years

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