Epstein-Barr virus (EBV) is a ubiquitous gammaherpes virus that establishes a life-long latency in over 90% of the world's population. Epstein Barr Nuclear Antigen 1, EBNA1, is the only viral protein consistently detected in all viral latency programs, as well as in all forms of EBV-associated malignancies. EBNA1 plays critical roles in the viral life cycle by fostering the replication and maintenance of the extrachromosomal viral genome as well as enhancing transcription from multiple viral promoters.
Identifying sites bound by Epstein-Barr virus nuclear antigen 1 (EBNA1) in the human genome: defining a position-weighted matrix to predict sites bound by EBNA1 in viral genomes.
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View SamplesThe hippocampus is part of a brain network essential for memory function. Paradoxically, the hippocampus is also the brain structure that is most sensitive to hypoxic-ischemic episodes. Here we show that the expression of genes associated with glycolysis and glutamate metabolism in astrocytes and the coverage of excitatory synapses by astrocytic processes undergo significant decreases in the CA1 field of the monkey hippocampus during postnatal development. Given the established role of astrocytes in the regulation of glutamate concentration in the synaptic cleft, our findings indicate that a developmental decrease in astrocytic processes underlies the selective vulnerability of CA1 during hypoxic-ischemic episodes in adulthood, its decreased susceptibility to febrile seizures with age, as well as contribute to the emergence of selective, adult-like memory function.
Developmental regulation of gene expression and astrocytic processes may explain selective hippocampal vulnerability.
Specimen part
View SamplesEpstein-Barr virus (EBV) has evolved exquisite controls over its host cells, human B lymphocytes, not only directing these cells during latency to proliferate and thereby expand the pool of infected cells, but also to survive and thereby persist for the lifetime of the infected individual. Although these activities ensure the virus is successful, they also make the virus oncogenic, particularly when infected people are immunosuppressed. Here we show, strikingly, that one set of EBV’s miRNAs both sustain BL (Burkitt’s lymphoma) cells in the absence of other viral oncogenes and promote the transformation of primary B lymphocytes. Burkitt’s Lymphoma cells were engineered to lose EBV and found to die by apoptosis and could be rescued by constitutively expressing viral miRNAs in them. Two of these EBV miRNAs were found to target Caspase 3 to inhibit apoptosis at physiological concentrations. Overall design: Examination of RISC associated transcripts under 4 conditions in Sav S1-1 cells
Epstein-Barr virus maintains lymphomas via its miRNAs.
Cell line, Treatment, Subject
View SamplesThe rat pineal transcriptome was sequenced using mid-day and mid-night samples to describe the pineal transcriptome and to identify transcripts that exhibit day/night differences in expression.
Circadian changes in long noncoding RNAs in the pineal gland.
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View SamplesThis SuperSeries is composed of the SubSeries listed below.
Night/day changes in pineal expression of >600 genes: central role of adrenergic/cAMP signaling.
Specimen part, Time
View SamplesBiological processes are optimized by circadian and circannual biological timing systems. In vertebrates, the pineal gland plays an essential role in these systems by converting time into a hormonal signal, melatonin; in all vertebrates, circulating melatonin is elevated at night, independent of lifestyle. At night, sympathetic input to the pineal gland, originating from the circadian clock in the suprachiasmatic nucleus, releases norepinephrine. This adrenergic stimulation causes an elevation of cAMP, which is thought to regulate many of the dramatic changes in genes expression known to occur at night. In many aspects, the adrenergic/cAMP effects on gene expression can be recapitulated in primary organ culture.
Night/day changes in pineal expression of >600 genes: central role of adrenergic/cAMP signaling.
Specimen part, Time
View SamplesBiological processes are optimized by circadian and circannual biological timing systems. In vertebrates, the pineal gland plays an essential role in these systems by converting time into a hormonal signal, melatonin; in all vertebrates, circulating melatonin is elevated at night, independent of lifestyle.
Night/day changes in pineal expression of >600 genes: central role of adrenergic/cAMP signaling.
Time
View SamplesBiological processes are optimized by circadian and circannual biological timing systems. In vertebrates, the pineal gland plays an essential role in these systems by converting time into a hormonal signal, melatonin; in all vertebrates, circulating melatonin is elevated at night, independent of lifestyle.
Night/day changes in pineal expression of >600 genes: central role of adrenergic/cAMP signaling.
Time
View SamplesWe identified SLC44A5 as a gene associated with birth weight in cattle based on genome wide association studies.
The molecular effects of a polymorphism in the 5'UTR of solute carrier family 44, member 5 that is associated with birth weight in Holsteins.
Cell line
View SamplesThis SuperSeries is composed of the SubSeries listed below.
Evidence that bovine forebrain embryonic zinc finger-like gene influences immune response associated with mastitis resistance.
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