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ABSTRACT: Transcriptomic analysis of the response to heat stress

PROVIDER: PRJNA699023 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR13615600_1.fastq.gz	Fastqsanger.gz
	SRR13615600_2.fastq.gz	Fastqsanger.gz
	SRR13615601_1.fastq.gz	Fastqsanger.gz
	SRR13615601_2.fastq.gz	Fastqsanger.gz
	SRR13615602_1.fastq.gz	Fastqsanger.gz

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Project description:Environmental stress, such as oxidative or heat stress, induces the activation of the heat shock response (HSR) and leads to an increase in the heat shock proteins (HSPs) level. These HSPs act as molecular chaperones to maintain cellular proteostasis. Controlled by highly intricate regulatory mechanisms, having stress-induced activation and feedback regulations with multiple partners, the HSR is still incompletely understood. In this context, we propose a minimal molecular model for the gene regulatory network of the HSR that reproduces quantitatively different heat shock experiments both on heat shock factor 1 (HSF1) and HSPs activities. This model, which is based on chemical kinetics laws, is kept with a low dimensionality without altering the biological interpretation of the model dynamics. This simplistic model highlights the titration of HSF1 by chaperones as the guiding line of the network. Moreover, by a steady states analysis of the network, three different temperature stress regimes appear: normal, acute, and chronic, where normal stress corresponds to pseudo thermal adaption. The protein triage that governs the fate of damaged proteins or the different stress regimes are consequences of the titration mechanism. The simplicity of the present model is of interest in order to study detailed modelling of cross regulation between the HSR and other major genetic networks like the cell cycle or the circadian clock. Sivéry, A., Courtade, E., Thommen, Q. (2016). A minimal titration model of the mammalian dynamical heat shock response. Physical biology, 13(6), 066008.

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Project description:With the intensification of global warming, rainbow trout is suffering from varying degrees thermal stimulation, heat stress may cause pathological signs or diseases by reducing the immune roles and then lead to mass mortality, so high temperatures severely restrict the development of its aquaculture. Understanding the molecular regulation mechanism of rainbow trout under heat stress is used to take measures to relieve symptoms. We performed multiple transcriptomic analysis of liver tissues from rainbow trout under heat stress (24 °C) and control conditions (18 °C) to identify circRNAs, miRNAs and mRNAs. Changes of non-specific immune parameters revealed that strong stress response of rainbow trout is caused in 24 °C. A total of 324 DEcircRNAs, 105 DEmiRNAs, and 1885 DEmRNAs were identified from six libraries, and ceRNA regulatory network is constructed. 301 circRNA–miRNA and 51 miRNA–mRNA negative correlation pairs were screened from ceRNA regulatory network, and predicted three regulatory correlation pairs that novel_circ_003889 - novel-m0674-3p - hsp90ab1, novel_circ_002325 - miR-18-y - HSPA13 and novel_circ_002446 - novel-m0556-3p - hsp70. Some genes involved in metabolic process, biological regulation or response to stimulus are highly induced at high temperatures. Several important pathways involved in heat stress were characterized, such as Protein processing in endoplasmic reticulum (ER), Estrogen signaling pathway, HIF-1 signaling pathway, etc. These results extend our understanding of the molecular mechanisms of heat stress response and expected to provide a novel insight into develop strategies for relieve heat stress.

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