{"doi":"10.1101/2022.10.24.511199","title":"Morpho-electric and transcriptomic divergence of the layer 1 interneuron repertoire in human versus mouse neocortex","abstract":"Abstract Neocortical layer 1 (L1) is a site of convergence between pyramidal neuron dendrites and feedback axons where local inhibitory signaling can profoundly shape cortical processing. Evolutionary expansion of human neocortex is marked by distinctive pyramidal neuron types with extensive branching in L1, but whether L1 interneurons are similarly diverse is underexplored. Using patch-seq recordings from human neurosurgically resected tissues, we identified four transcriptomically defined subclasses, unique subtypes within those subclasses and additional types with no mouse L1 homologue. Compared with mouse, human subclasses were more strongly distinct from each other across all modalities. Accompanied by higher neuron density and more variable cell sizes compared with mouse, these findings suggest L1 is an evolutionary hotspot, reflecting the increasing demands of regulating the expanding human neocortical circuit. One Sentence Summary Using transcriptomics and morpho-electric analyses, we describe innovations in human neocortical layer 1 interneurons.","journal":"bioRxiv (Cold Spring Harbor Laboratory)","year":2022,"id":297018,"datarank":0.5395985789621257,"base_score":2.70805020110221,"endowment":2.70805020110221,"self_citation_contribution":0.40620753016533157,"citation_network_contribution":0.13339104879679417,"self_endowment_contribution":0.40620753016533157,"citer_contribution":0.13339104879679417,"corpus_percentile":null,"corpus_rank":null,"citation_count":14,"citer_count":7,"citers_with_citation_signal":7,"citers_with_endowment":7,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9254,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2022-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":38331,"name":"Rachel Dalley","orcid":"0000-0001-7461-7845","position":1,"is_corresponding":false},{"id":557047,"name":"Jennie Close","orcid":"0000-0001-9234-5855","position":2,"is_corresponding":false},{"id":551973,"name":"Natalia A. 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