Dataset Information

Identification and expression profiling of microRNAs in brain, liver and gonads of marine medaka (Oryzias melastigma) by Illumina small RNA Sequencing

ABSTRACT: We performed miRNA transcriptome analysis of mature medaka tissues using high-throughput next generation sequencing technology. The small RNA libraries were contructed from brain, liver and gonads in mature male and female medaka and a total of more than 128 million sequencing reads were generated from the six small RNA libraries. By comparison to known miRNA database, a total of 223 known miRNA types were identified with more than 50% expressed in brain. The expression profiling showed that almost half of the miRNAs are tissue-specific, with only 55 miRNA types from 34 families common to all tissues. A small number of miRNAs are also gender-specific. The experimental validation was performed for five represented miRNA candidates and four of them are confirmed.

ORGANISM(S): Oryzias melastigma

PROVIDER: GSE42696 | GEO | 2014/07/01

SECONDARY ACCESSION(S): PRJNA182747

REPOSITORIES: GEO

ACCESS DATA

Similar Datasets

Project description:The anabolic androgen 17M-NM-2-trenbolone (TB) can cause masculinization and reduce fecundity of fish. However, the underlying mechanisms of various biological pathways including metabolism, biosynthesis etc. are largely unknown. Here, we evaluated the effects of TB using the medaka DNA microarray representing 36,398 genes. Larval medaka, Oryzias latipes, (within 24 hrs posthatch) were exposed to TB at various concentrations (2, 6, 20, 60, 100, 200 ng/L) for up to 7 days. Dose-response relationships in gene expression levels of the categorized genes were analyzed using the cumulative chisquared method. Microarray analyses of the TB-exposed larvae showed that 117 and 32 genes were determined as up and down-regulated genes, respectively. The most significant GO term for biological process identified within this gene list was lipid metabolic process, which contained 26 genes in up-regulated genes. In this category, M-bM-^@M-^\cholesterol biosynthetic processM-bM-^@M-^] was highlighted as an important subcategory with 15 genes, including hydroxymethylglutaryl-CoA synthase cytoplasmic, squalene monooxygenase, lanosterol synthase etc. RT-PCR measurements in these genes were consistent with the microarray results in the direction and magnitude of these changes in gene expression. On the other hands, in the category of M-bM-^@M-^\sexual differentiation and developmentM-bM-^@M-^], genes related to hypothalamic-pituitary-gonadal (HPG) axis were not affected by TB treatment except for one gene encoded to cytochrome P450 19A1. Genes related to oogenesis, such as choriogenins and vitellogenins were weakly down regulated at 2-200 ng/L of TB. Our findings demonstrate that genes encoding cholesterol synthesis pathway via the mevalonate pathway were controlled by TB in larval medaka. TB concentrations used were 0 (control), 2, 6, 20, 60, 100 and 200 ng/L for 7 days of exposure. Each TB treatment had 90 larval medaka for each chamber. At day 7 of the exposures, triplicate samples (30 larvae/sample) from each chamber respectively were collected, flash-frozen in liquid nitrogen, and stored in liquid nitrogen until RNA extraction.

Dataset Information

Identification and expression profiling of microRNAs in brain, liver and gonads of marine medaka (Oryzias melastigma) by Illumina small RNA Sequencing

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure