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Ursus arctos

ABSTRACT: Ursus arctos Genome sequencing

PROVIDER: PRJNA271471 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
	SRR1693624_1.fastq.gz	Fastqsanger.gz
	SRR1693624_2.fastq.gz	Fastqsanger.gz
	SRR1693654_1.fastq.gz	Fastqsanger.gz
	SRR1693654_2.fastq.gz	Fastqsanger.gz
	SRR1692419_1.fastq.gz	Fastqsanger.gz

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Biochemical Foundations of Health and Energy Conservation in Hibernating Free-Ranging Subadult Brown Bear Ursus arctos

Project description:Brown bears (Ursus arctos) hibernate for 5-7 months without eating, drinking, urinating and defecating at a metabolic rate of only 25% of the summer activity rate. Nonetheless, they emerge healthy and alert in spring. We analyzed the physiological adaptations for hibernation by comparing the proteome, metabolome, and hematologic features of blood from hibernating and active free-ranging sub-adult brown bears with a focus on conservation of health and energy. We found that the concentrations of most plasma proteins and white blood cell types decreased during hibernation. Strikingly, antimicrobial defense proteins increased in concentration. Central functions in hibernation involving the coagulation response and protease inhibition, as well as lipid transport and metabolism, were upheld by increased levels of very few key or broad-specificity proteins. A dramatic 45-fold increase in sex-hormone-binding-globulin SHBG levels during hibernation draws, for the first time, attention to its significant but unknown role in maintaining hibernation physiology. We propose that energy for the costly protein synthesis is reduced by three mechanisms, (i) dehydration, which increases protein concentration without de novo synthesis; (ii) reduced protein degradation rates due to a 6°C reduction in body temperature, decreased protease activity, and increased plasma viscosity; and (iii) a marked redistribution of energy resources only increasing de novo synthesis of few key proteins. This comprehensive global data identified novel biochemical strategies for bear adaptations to the extreme condition of hibernation, and have implications for our understanding of physiology in general.

2016-09-27 | PXD003946 | Pride

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