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Nicol, J.

Publications and source records attributed to Nicol, J..

2 recordsLinked to original sources

Non-coding RNA controls long-range enhancer-promoter interactions

Transcription regulation depends on interactions between enhancers and gene promoters, which often occur over large genomic distances. The molecular drivers of long-range enhancer-promoter interactions remain poorly understood. Enhancers themselves are known to be transcribed into non-coding RNAs, but the function of these transcripts is unclear. Here, we use acute genetic and chemical perturbations of transcription elongation and termination to study the role of non-coding RNA in enhancer-promoter interactions. By integrating high-resolution 3D genome mapping, transcriptomics, proteomics, biochemistry and live-cell super-resolution imaging in these perturbation contexts, we demonstrate that a strong increase in RNA molecules at enhancers disrupts their long-range interactions with gene promoters, whereas decreased RNA levels lead to stabilization of these interactions. Using separation-of-function perturbations, we show that this regulatory function of RNA is independent from the process of transcription and the proteins recruited to initiate transcription. Functionally, we show that RNA-mediated disruption of enhancer-promoter interactions is associated with reduced transcription of target genes, indicating a regulatory feedback mechanism. Together, our results uncover an additional regulatory principle of enhancer-promoter interactions mediated by non-coding RNA.

genomics↗

Psychedelics enhance the effects of brain stimulation in rodents

BackgroundPsychedelic drugs have resurged in neuroscience and psychiatry with promising success in psychedelic-assisted therapy for the treatment of anxiety, depression, and addiction. At the cellular level, psychedelic drugs elicit neuroplastic processes 24 hours after administration, priming neural circuits for change. The acute effects of psychedelic drugs are well characterized with functional imaging and neural oscillations showing an increase in the entropy of spontaneous cortical activity. HypothesesWe hypothesized that cortical-striatal oscillations recorded in rats would confirm the effects of psychedelic drugs. We also hypothesized that brain stimulation delivered 24 hours after LSD administration would lead to different effects than brain stimulation alone. MethodsWe recorded local field potential (LFP) oscillations from rats following lysergic acid diethylamide (LSD) or saline administration and determined if exposure to these treatments altered the effect of a targeted intervention (brain stimulation) 24 hours later. ResultsWe confirmed acutely decreased low frequency power across the brain when rats are given LSD. We also demonstrated these altered states return to baseline after 24 hours. Brain stimulation applied in the previously reported window of heightened neuroplasticity produced distinct shifts in brain state compared to brain stimulation applied 24 hours after saline. ConclusionsDespite the acute effects of LSD disappearing after 24 hours, there are still latent effects that interact with brain stimulation to create larger and distinct changes in brain activity compared to brain stimulation alone. Our proof-of-concept findings are the first to suggest that psychedelic drugs could work in combination with brain stimulation to achieve enhanced effects on brain activity and future work will assess impacts on stimulation induced changes in behavior.

neuroscience↗