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Bos taurus

ABSTRACT: MicroRNAomes of cattle intestinal tissues revealed possible miRNA regulated mechanisms involved in Escherichia coli O157 fecal shedding

PROVIDER: PRJNA380253 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR5368710.fastq.gz	Fastqsanger.gz
	SRR5368720.fastq.gz	Fastqsanger.gz
	SRR5368730.fastq.gz	Fastqsanger.gz
	SRR5368740.fastq.gz	Fastqsanger.gz
	SRR5368750.fastq.gz	Fastqsanger.gz

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MicroRNAomes of cattle intestinal tissues revealed possible miRNA regulated mechanisms involved in Escherichia coli O157 fecal shedding

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Project description:The Gayal (Bos frontalis) is a rare semi-domesticated cattle in China. Gayal has typical beef body shape and good meat production performance. Compared with other cattle species, it has the characteristics of tender meat and extremely low fat content. To explore the underlying mechanism responsible for the differences of meat quality between different breeds, the longissimus dorsi muscle (LM) from Gayal and Banna cattle (Bos taurus) were investigated using transcriptome analysis. The gene expression profiling identified 638 differentially expressed genes (DEGs) between LM muscles from Gayal and Banna cattle. Gene Ontology (GO) enrichment of biological functions and Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis showed that the gene products were mainly involved in the PPAR signaling pathway, lipid metabolism and amino acid metabolism pathway. Protein-protein interaction（PPI） network analysis showed APOB, CYP7A1, THBS2, ITGAV, IGFBP1 and IGF2R may have great impact on meat quality characteristics of Gayal. Moreover, three transcription factors, FOXA2, NEUROG2, and RUNX1, which may affect meat quality by regulating the expression of genes related to muscle growth and development have also been found. In summary, our research reveals the molecular mechanisms that cause Gayal meat quality characteristics. It will contribute to improving meat quality of cattle through molecular breeding.

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Host mechanisms potentially associated with foodborne pathogen Escherichia coli O157 shedding in feedlot beef cattle

Project description:Cattle shedding > 10e4 CFU of Escherichia coli O157 per g of feces are defined as super-shedders. RNA-sequencing was performed to identify the transcriptome of tissues, including duodenum, proximal jejunum, distal jejunum, distal jejunum, cecum, spiral colon and descending colon of super-shedder cattle in comparison with non-shedders. The total number of genes detected in gut tissues ranged from 16,846 ± 639 (cecum) to 18,137 ± 696 (distal jejunum), and immune functions were enriched for the transcriptomes of small intestinal tissues, reflecting their greater immune activity than large intestine. Totally 351 differentially expression genes were identified between super-shedders and non-shedders, including 101 up-regulated and 250 down-regulated in super-shedders. Differential gene expression analysis suggested increased T-cell responses and cholesterol absorption in distal jejunum and descending colon, and inhibited B-cell maturation in intestines of super-shedders. distal jejunum of super-shedders. Our findings suggested that host genetics and E. coli O157 activities are involved in super-shedding phenomenon.

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Project description:Tropical theileriosis in a cattle disease of global economic importance, caused by the tick-borne protozoan parasite Theileria annulata. Conventional control strategies are failing to contain the disease and an attractive alternative is the use of pre-existing genetic resistance or tolerance. However, tropical theileriosis tolerant cattle are less productive than some susceptible breeds. To combine resistance and production traits requires an understanding of the mechanisms involved in resistance. Therefore, we have compared the response of monocytes derived from tolerant (Sahiwals, Bos indicus) and susceptible (Holstein-Friesians, B. taurus) cattle to in vitro infection with T. annulata. Over 150 genes exhibited breed-specific differential expression during the course of infection and nearly one third were differentially expressed in resting cells, implying that there are inherent differences between monocytes from the breeds. Fifty sequences currently only match ESTs or are unique to the library used to generate the microarray. The differential expression of a selection of genes was validated by quantitative RT-PCR, e.g. CD9, prion protein and signal-regulatory protein alpha. A large proportion of the differentially expressed genes encode proteins expressed on the plasma membrane or in the extracellular space and cell adhesion was one of the major Gene Ontology biological processes identified. We therefore hypothesise that the breed-specific tolerance of Sahiwal cattle compared to Holstein-Friesians is due to the interaction of infected cells with other immune cells, which influences the immune response generated against T. annulata infection. The BoMP microarray is available from the ARK-Genomics facility (www.ark-genomics.org).

2007-04-26 | E-MAXD-25 | biostudies-arrayexpress

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