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Equus caballus

ABSTRACT: Characterization of the equine skeletal muscle transcriptome identifies novel functional responses to exercise training

PROVIDER: PRJNA126255 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR039582.fastq.gz	Fastqsanger.gz
	SRR039583.fastq.gz	Fastqsanger.gz
	SRR039584.fastq.gz	Fastqsanger.gz
	SRR039585.fastq.gz	Fastqsanger.gz
	SRR039586.fastq.gz	Fastqsanger.gz

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Characterization of the equine skeletal muscle transcriptome identifies novel functional responses to exercise training

Project description:Digital gene expression profiling was used to characterize the assembly of genes expressed in equine skeletal muscle and to identify the subset of genes that were differentially expressed following a ten month period of exercise training. The study cohort comprised 7 thoroughbred racehorses from a single training yard. Skeletal muscle biopsies were collected at rest from the gluteus medius at two time points: T1 (unconditioned), (9 +/- 0.5 months old) and T2 (conditioned) (20 +/- 0.7 months old). The most highly abundant genes in the muscle transcriptome were those involved in muscle contraction, aerobic respiration and mitochondrial function. A previously unreported over-representation of genes relating to RNA processing, the stress response and proteolysis was observed. Following training 92 tags were differentially expressed of which 74 were annotated. Sixteen genes showed increased expression, including the mitochondrial genes, ACADVL, MRPS21 and SLC25A29. Among the 58 genes with deceased expression MSTN, a negative regulator of muscle growth had the greatest decrease. Functional analysis of all expressed genes using FatiScan revealed an asymmetric distribution of 482 Gene Ontology groups and 18 KEGG pathways. Functional groups with highly significantly (P < 0.0001) increased expression included mitochondrion, oxidative phosphorylation and fatty acid metabolism while functional groups with decreased expression were mainly associated with structural genes and included the sarcoplasm, laminin complex and cytoskeleton. Examination of muscle expression changes in 7 thoroughbred horses following 10 months of exercise training using digital gene expression with NlaIII.

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Transcription profiling of soleus muscle from lean and obese Zucker rats following exercise training

Project description:Endurance exercise training has been shown to decrease whole-body and skeletal muscle insulin resistance and increase glucose tolerance in conditions of both pre-diabetes and overt type 2 diabetes. However, the adaptive responses in skeletal muscle at the molecular and genetic level for these beneficial effects of exercise training have not been clearly established in an animal model of pre-diabetes. The present study identifies alterations in skeletal muscle gene expression that occur with exercise training in pre-diabetic, insulin-resistant obese Zucker (fa/fa) rats and insulin-sensitive lean Zucker (Fa/-) rats. Treadmill running for up to 4 weeks caused significant enhancements of glucose tolerance as assessed by the integrated area under the curve for glucose (AUCg) during an oral glucose tolerance test in both lean and obese animals. Using microarray analysis, a set of only 12 genes was identified as both significantly altered (>1.5-fold change relative to sedentary controls; p<0.05) and significantly correlated (p<0.05) with the AUCg. Two of these genes, peroxisome proliferator-activated receptor-g coactivator 1a (PGC-1a) and the z-isoform of protein kinase C (PKC-z), have known involvement in the regulation of skeletal muscle glucose transport. We confirmed that protein expression levels of PGC-1a and PKC-z were positively correlated with the mRNA expression levels for these two genes. Overall, this study has identified a limited number of genes in soleus muscle of lean and obese Zucker rats that are associated with decreased insulin resistance and increase glucose tolerance following endurance exercise training. These findings could guide the development of pharmaceutical M-^Sexercise mimeticsM-^T in the treatment of insulin-resistant, pre-diabetic or overtly type 2 diabetic individuals.

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