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ABSTRACT: Mycobiome of bat and bat habitate

PROVIDER: PRJNA665586 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR12711842_1.fastq.gz	Fastqsanger.gz
	SRR12711842_2.fastq.gz	Fastqsanger.gz
	SRR12711843_1.fastq.gz	Fastqsanger.gz
	SRR12711843_2.fastq.gz	Fastqsanger.gz
	SRR12711844_1.fastq.gz	Fastqsanger.gz

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Project description:We compared PPARg binding sites in BAT and eWAT to identify regulatory elements that contribute to BAT identity and to find an important factor that bind those elements. To this end, we performed PPARg ChIP-seq in both tissues and called each tissue-spsecific binding sites. PPARg ChIP-seq in BAT and eWAT of mice

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Project description:Mammals adaptively regulate energy metabolism in response to environmental changes such as starvation and cold circumstances. Thioredoxin-interacting protein (Txnip), known as a redox regulator, serves as a nutrient sensor regulating energy homeostasis. Txnip is essential for mice to adapt to starvation, but its role in adapting to cold circumstances remains unclear. Here, we identified Txnip as a pivotal factor for maintaining non-shivering thermogenesis in mice. Txnip protein levels in brown adipose tissue (BAT) were upregulated by the acute cold exposure. Txnip-deficient (Txnip-/-) mice acclimated to thermoneutrality (30°C) exhibited significant BAT enlargement and triglyceride accumulation with downregulation of BAT signature and metabolic gene expression. Upon acute cold exposure (5°C), Txnip-/- mice showed a rapid decline in BAT surface temperatures with the failure of increasing metabolic respiration, developing lethal hypothermia. The BAT dysfunction and cold susceptibility in Txnip-/- mice were corrected by acclimation to 16°C, protecting the mice from life-threatening hypothermia. Transcriptomic and metabolomic analysis using dissected BAT revealed that despite preserving glycolysis, the BAT of Txnip-/- mice failed to activate the catabolism of branched-chain amino acids and fatty acids in response to acute cold stress. These findings illustrate that Txnip is required for maintaining basal BAT function and ensuring cold-induced thermogenesis.

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Project description:Bats are a major reservoir of zoonotic viruses, and there has been growing interest in characterizing bat-specific features of innate immunity and inflammation. Recent studies have revealed bat-specific adaptations affecting interferon (IFN) signaling and IFN-stimulated genes (ISGs), but we still have a limited understanding of the genetic mechanisms that have shaped the evolution of bat immunity. Here we investigated the transcriptional and epigenetic dynamics of transposable elements (TEs) during the type I IFN response in little brown bat (Myotis lucifugus) primary embryonic fibroblast cells, using RNA-seq and CUT&RUN. We found multiple bat-specific TEs that undergo both locus-specific and family-level transcriptional upregulation in response to IFN. Our transcriptome reassembly identified multiple ISGs that have acquired novel exons from bat-specific TEs, including NRLC5, SLNF5 and a previously unannotated isoform of the IFITM2 gene. We also identified examples of TE-derived regulatory elements, but did not find strong evidence supporting genome-wide epigenetic activation of TEs in response to IFN. Collectively, our study uncovers numerous TE-derived transcripts, proteins, and alternative isoforms that are induced by IFN in Myotis lucifugus cells, highlighting potential candidate loci that contribute to bat-specific immune function.

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Project description:Prdm16 is a transcription factor that drives a complete program of brown adipocyte differentiation, but the mechanism by which Prdm16 activates gene transcription remains unknown. Utilizing ChIP-seq teqhnique, we found that Prdm16 binds to chromatin at/near many brown fat-selective genes in BAT. Interestingly, Prdm16-deficiency dramatically reduced the binding of Med1 to Prdm16-target sites. Indeed, Prdm16 binds and recruits Med1 to BAT-enriched genes and the loss of Prdm16 caused a fundamental change in chromatin architecture at key BAT-selective genes and also reduced transcirptional activity. Moreover, Prdm16, through its interaction with Med1, defines and regulates the activity of super-enhancers that drive the expression of cell identity genes. Together, these data demonstrate that Prdm16 drives gene transcription by recruiting Med1 to control chromatin architecture and super-enhancers. Brown adipose tissues were collected from Prdm16 knockout and wiletype 9-month-old mice and ChIP-seq was performed for Prdm16, PolII, Med1, and H3K27ac.

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