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Learn MoreThe goal of this project was to assess how alternative splicing programs are arrayed across neuronal cells types. We systematically mapped ribosome-associated transcript isoforms in genetically-defined neuron types of the mouse forebrain. The endogenous ribosomal protein Rpl22 was conditionally HA-tagged in glutamatergic neurons (using CamK2-cre for most neocortical pyramidal cells and Scnn1a-cre for spiny stellate and star pyramid layer 4 cells), and GABAergic interneurons [with somatostatin-cre (SST), parvalbumin-cre (PV) and vasointestinal peptide-cre (VIP)]. Within the hippocampus, we further targeted Cornu ammonis 1 (CA1) neurons (CamK2-cre), CA3 neurons (Grik4-cre), and SST-positive interneurons (SST-cre). Four replicates were deep sequenced (~100 million reads) using an Illumina platform. We find that neuronal transcript isoform profiles reliably distinguish even closely-related classes of pyramidal cells and inhibitory interneurons in the mouse hippocampus and neocortex, positing transcript diversification by alternative splicing as a central mechanism for the functional specification of neuronal cell types and circuits. SOURCE: Geoffrey Fucile University of Basel
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