Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Circadian Rhythm of Gene Expression Patterns in Liver of Mouse

ABSTRACT: Genes encoding the circadian pacemaker in the hypothalamic suprachiasmatic nuclei (SCN) of mammals have recently been identified, but the molecubasis of circadian timing in peripheral tissue is not well understood. We used a bead-based microarray to identify mouse liver transcripts that show circadian cycles of abundance under constant conditions. Keywords: Time course microarray-based expression profiling of mRNA with triplicates in mouse liver for 48 hours at 4-hour intervals

ORGANISM(S): Mus musculus

SUBMITTER: YoungJi Na

PROVIDER: E-GEOD-11516 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Comprehensive analysis of microRNA-mRNA co-expression in circadian rhythm.

Na Young Ji YJ Sung Jung Hwan JH Lee Suk Chan SC Lee Young Ju YJ Choi Yeun Joo YJ Park Woong Yang WY Shin Hee Sup HS Kim Ju Han JH

Experimental & molecular medicine 20090901 9

To investigate the potential role of microRNA (miRNA) in the regulation of circadian rhythm, we performed microarray-based expression profiling study of both miRNA and mRNA in mouse liver for 48 h at 4-hour intervals. Circadian miRNA-mRNA target pair is defined as the pair both elements of which show circadian expression patterns and the sequence-based target relationship of which can be predicted. Circadian initiators, Clock and Bmal1, showed inversely correlated circadian expression patterns a ...[more]

PMID: 19478556

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Project description:To screen for specific circadian outputs that may distinguish the pacemaker in the mammalian suprachiasmatic nucleus (SCN) from peripheral-type oscillators in which the canonical clockworks are similarly regulated in a circadian manner, the rhythmic behavior of the transcriptome in forskolin-stimulated NIH/3T3 fibroblasts was analyzed and compared to that found in the rat SCN in vivo and SCN2.2 cells in vitro. Similar to the scope of circadian gene expression in SCN2.2 cells and the rat SCN, NIH/3T3 fibroblasts exhibited circadian fluctuations in the expression of the core clock genes, Per2, Bmal1 (Mop3), and Cry1 and 323 functionally diverse transcripts (2.6%), many of which were involved in cell communication. Overlap in rhythmically-expressed transcripts among NIH/3T3 fibroblasts, SCN2.2 cells and the rat SCN was limited to these clock genes and four other genes that mediate fatty acid and lipid metabolism or function as nuclear factors. Compared to NIH/3T3 cells, circadian gene expression in SCN oscillators was more prevalent among cellular pathways mediating glucose metabolism and neurotransmission. Coupled with evidence for the rhythmic regulation of the inducible isoform of nitric oxide synthase, the enzyme responsible for the production of nitric oxide, in SCN2.2 cells and the rat SCN but not in fibroblasts, studies examining the effects of a NOS inhibitor on metabolic rhythms in co-cultures containing SCN2.2 cells and untreated NIH/3T3 cells suggest that this gaseous neurotransmitter may play a key role in SCN pacemaker function. Thus, this comparative analysis of circadian gene expression in SCN and non-SCN cells may have important implications in the selective identification of circadian signals involved in the coupling of SCN oscillators and the regulation of rhythmicity in downstream cells or tissues. Experiment Overall Design: Circadian profiling of the NIH/3T3 fibroblast transcriptome entailed the treatment of NIH/3T3 cells with a 15uM forskolin pulse, subsequent washout of the drug, and collection of total RNA immediately after washout and every 6 hours across two circadian cycles for each of three experiments. Timepoint values reflect the average of three samples from these biological replicates.

Dataset Information

Circadian Rhythm of Gene Expression Patterns in Liver of Mouse

Publications

Comprehensive analysis of microRNA-mRNA co-expression in circadian rhythm.

Similar Datasets

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