2022
A bidirectional competitive interaction between circHomer1 and Homer1b within the orbitofrontal cortex regulates reversal learning
Hafez A, Zimmerman A, Papageorgiou G, Chandrasekaran J, Amoah S, Lin R, Lozano E, Pierotti C, Dell'Orco M, Hartley B, Alural B, Lalonde J, Esposito J, Berretta S, Squassina A, Chillotti C, Voloudakis G, Shao Z, Fullard J, Brennand K, Turecki G, Roussos P, Perlis R, Haggarty S, Perrone-Bizzozero N, Brigman J, Mellios N. A bidirectional competitive interaction between circHomer1 and Homer1b within the orbitofrontal cortex regulates reversal learning. Cell Reports 2022, 38: 110282. PMID: 35045295, PMCID: PMC8809079, DOI: 10.1016/j.celrep.2021.110282.Peer-Reviewed Original ResearchConceptsImportance of circRNAsRNA-binding proteinSynaptic gene expressionCircular RNAsGene expressionOrbitofrontal cortexCompetitive interactionsComplete rescuePsychiatric disordersKnockdownSynaptic expressionMechanistic insightsBrain functionMRNAHomer1bBehavioral flexibilityNeuronal culturesExpressionBiogenesisCircRNAsRNAProteinRegulatesReversal learningDisorders
2021
Using the dCas9-KRAB system to repress gene expression in hiPSC-derived NGN2 neurons
Li A, Cartwright S, Yu A, Ho SM, Schrode N, Deans PJM, Matos MR, Garcia MF, Townsley KG, Zhang B, Brennand KJ. Using the dCas9-KRAB system to repress gene expression in hiPSC-derived NGN2 neurons. STAR Protocols 2021, 2: 100580. PMID: 34151300, PMCID: PMC8188621, DOI: 10.1016/j.xpro.2021.100580.Peer-Reviewed Original ResearchConceptsCRISPR inhibitionGene expressionDCas9-KRAB systemEndogenous gene expressionMultiple target genesGene repressionGene activationTarget genesGene manipulationFusion proteinComplete detailsPluripotent stemExpressionGlutamatergic neuronsRepressionGenesPhenotypicProteinStemNeuronsActivationBrain diseasesInhibition
2017
Evaluating Synthetic Activation and Repression of Neuropsychiatric-Related Genes in hiPSC-Derived NPCs, Neurons, and Astrocytes
Ho S, Hartley B, Flaherty E, Rajarajan P, Abdelaal R, Obiorah I, Barretto N, Muhammad H, Phatnani H, Akbarian S, Brennand K. Evaluating Synthetic Activation and Repression of Neuropsychiatric-Related Genes in hiPSC-Derived NPCs, Neurons, and Astrocytes. Stem Cell Reports 2017, 9: 615-628. PMID: 28757163, PMCID: PMC5550013, DOI: 10.1016/j.stemcr.2017.06.012.Peer-Reviewed Original ResearchConceptsSynthetic activationRisk genesCell typesModulation of transcriptionNeuropsychiatric risk genesCommon single nucleotide variantsCas9 fusion proteinsEndogenous expression levelsNeural cell typesPluripotent stem cell-derived neural progenitor cellsRare copy number variationsCopy number variationsSingle nucleotide variantsNeural progenitor cellsGene functionFunctional annotationGenetic studiesGenesRisk variantsProgenitor cellsExpression levelsTranscriptionRepressionPositional effectsProtein
2015
Increased abundance of translation machinery in stem cell–derived neural progenitor cells from four schizophrenia patients
Topol A, English J, Flaherty E, Rajarajan P, Hartley B, Gupta S, Desland F, Zhu S, Goff T, Friedman L, Rapoport J, Felsenfeld D, Cagney G, Mackay-Sim A, Savas J, Aronow B, Fang G, Zhang B, Cotter D, Brennand K. Increased abundance of translation machinery in stem cell–derived neural progenitor cells from four schizophrenia patients. Translational Psychiatry 2015, 5: e662-e662. PMID: 26485546, PMCID: PMC4930118, DOI: 10.1038/tp.2015.118.Peer-Reviewed Original ResearchConceptsHiPSC neural progenitor cellsNeural progenitor cellsNovel post-transcriptional mechanismProtein synthesisGlobal protein translationElongation factor proteinGlobal protein synthesisPost-transcriptional mechanismsProgenitor cellsHuman-induced pluripotent stem cellsPluripotent stem cellsMass spectrometry evidenceTranslation machineryTranslation initiationProtein translationEpigenetic factorsFactor proteinStem cellsProtein levelsTotal protein levelsCellsUnaffected controlsMachineryProteinAbundance