Unknown,Transcriptomics,Genomics,Proteomics

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Screening for altered plasma miRNAs in traumatic brain injured patients

ABSTRACT: In this study, we examined if the composition of plasma miRNAs is altered in patients with traumatic brain injury (TBI), and if these changes can be used as diagnostic markers. A microarray containing 875 human miRNAs was used to compare the miRNA profile of plasma collected from severe TBI patients (GCS M-bM-^IM-$ 8) to that of age-, gender-, and race-matched healthy volunteers. This screen identified 108 miRNAs in the plasma of healthy volunteers. Of these, 52 were found to be altered in plasma samples from persons with severe TBI, and an additional 8 miRNAs were detected only in the plasma of TBI patients. Plasma samples from 10 patients from either severe TBI (experimental group) or healthy volunteers (reference group; age-, gender-, and race-matched ) were pooled, the total RNA extracted in parallel, eluted in 100ul, and dried to 30 ul. Equal volumes of extracted plasma RNAs were assayed for global miRNA content using a service provider (LC Sciences, Houston, TX). There were no replicates performed for this screen. Healthy volunteer group served as the reference.

ORGANISM(S): Homo sapiens

SUBMITTER: John Redell

PROVIDER: E-GEOD-21854 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:The sea cucumber Apostichopus japonicus withstands high water temperatures in the summer by suppressing metabolic rate and entering a state of aestivation. We hypothesized that changes in the expression of miRNAs could provide important post-transcriptional regulation of gene expression during hypometabolism via control over mRNA translation. The present study analyzed profiles of miRNA expression in the sea cucumber respiratory tree using Solexa deep sequencing technology. We identified 279 sea cucumber miRNAs, including 15 novel miRNAs specific to sea cucumber. Animals sampled during deep aestivation (DA; after at least 15 days of continuous torpor) were compared with animals from a non-aestivation (NA) state (animals that had passed through aestivation and returned to an active state). We identified 30 differentially expressed miRNAs ([RPM (reads per million) >10, |FC| (|fold change|) M-bM-^IM-%1, FDR (false discovery rate) <0.01]) during aestivation, which were validated by two other miRNA profiling methods: miRNA microarray and real-time PCR. Among the most prominent miRNA species, miR-124, miR-124-3p, miR-79, miR-9 and miR-2010 were significantly over-expressed during deep aestivation compared with non-aestivation animals, suggesting that these miRNAs may play important roles in metabolic rate suppression during aestivation. In the present study, an analysis of the global profile of small RNAs was conducted using Solexa sequencing technology in non-aestivation (NA) and deep aestivation (DA) sea cucumbers. We focus on respiratory tree in the present study because it is the important site responsible for the strong metabolic rate depression seen under deep aestivating conditions and the global expression profile of mRNA from the this organ has also been constructed applying RNA-seq technology in our previous study (Zhao and Chen, unpublished data). A preliminary analysis of the functional relevance of miRNA expression in relation to hypometabolism during aestivation is presented. A miRNA microarray and RT-qPCR were both used to supplement and confirm differentially expressed miRNAs. Our findings provide important new insights into the molecular mechanisms of sea cucumber aestivation.

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Screening for altered plasma miRNAs in traumatic brain injured patients

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