RT Journal Article SR Electronic T1 Decoding the molecular landscape of the developing spatial processing system and production of entorhinal stellate cell-like cells by a direct programming approach JF bioRxiv FD Cold Spring Harbor Laboratory SP 738443 DO 10.1101/738443 A1 Tobias Bergmann A1 Yong Liu A1 Leo Mogus A1 Julie Lee A1 Ulrich Pfisterer A1 Louis-Francois Handfield A1 Andrea Asenjo-Martinez A1 Irene Lisa-Vargas A1 Stefan E Seemann A1 Jimmy Tsz Hang Lee A1 Nikolaos Patikas A1 Birgitte Rahbek Kornum A1 Mark Denham A1 Poul Hyttel A1 Menno P Witter A1 Jan Gorodkin A1 Tune H Pers A1 Martin Hemberg A1 Konstantin Khodosevich A1 Vanessa Jane Hall YR 2021 UL http://biorxiv.org/content/early/2021/03/31/738443.abstract AB Classic studies investigating how and when the entorhinal cortex (component of the memory processing system of the brain) develops have been based on traditional thymidine autoradiography and histological techniques. In this study, we take advantage of modern technologies to trace at a high resolution, the cellular complexity of the developing porcine medial entorhinal cortex by using single-cell profiling. The postnatal medial entorhinal cortex comprises 4 interneuron, 3 pyramidal neuron and 2 stellate cell populations which emerge from intermediate progenitor and immature neuron populations. We discover four MGE-derived interneurons and one CGE-derived interneuron population as well as several IN progenitors. We also identify two oligodendrocyte progenitor populations and three populations of oligodendrocytes. We perform a proof-of-concept experiment demonstrating that porcine scRNA-seq data can be used to develop novel protocols for producing human entorhinal cells in-vitro. We identified six transcription factors (RUNX1A1, SOX5, FOXP1, MEF2C, TCF3, EYA2) important in neurodevelopment and differentiation from one RELN+ stellate cell population. Using a lentiviral vector approach, we reprogrammed human induced pluripotent stem cells into stellate cell-like cells which expressed RELN, SATB2, LEF1 and BCL11B. Our findings contribute to the understanding of the formation of the brain’s cognitive memory and spatial processing system and provides proof-of-concept for the production of entorhinal cells from human pluripotent stem cells in-vitro.Competing Interest StatementThe authors have declared no competing interest.AbbreviationsBMPbone morphogenetic proteinCHIRGSK-3α/β inhibitorCNScentral nervous systemDDayDMEMdulbecco’s modified eagle’s mediumEEmbryonic dayECentorhinal cortexEDTAEthylenediaminetetraacetic acidgDNAgenomic DNAGOIgene of interesthhoursiPSCinduced pluripotent stem cellsINinterneuronsIPintermediate progenitorLlayerLVlentivirusLEClateral entorhinal cortexMECmedial entorhinal cortexMOImultiplicity of infectionOPColigodendrocyte progenitor cellPpostnatal dayPBSphosphate-buffered salinePCRpolymerase chain reactionPYRpyramidal neuronqPCRquantitative real time PCRRELNReelin geneRTroom temperaturescRNA-seqSingle-cell RNA sequencingSCstellate cellSDstandard deviationSPEspeed cellSSTsomatostatinTFtranscription factorUunits of viral particlesUMIunique molecular identifierVPDvolume of produced virus