{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1360009142492409216.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1523/jneurosci.1116-20.2020"}},{"identifier":{"@type":"URI","@value":"https://syndication.highwire.org/content/doi/10.1523/JNEUROSCI.1116-20.2020"}},{"identifier":{"@type":"DOI","@value":"10.1101/2020.05.26.117713"}},{"identifier":{"@type":"PMID","@value":"32887743"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Developmental Phase Transitions in Spatial Organization of Spontaneous Activity in Postnatal Barrel Cortex Layer 4"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>Spatially-organized spontaneous activity is a characteristic feature of developing mammalian sensory systems. However, the transitions of spontaneous-activity spatial organization during development and related mechanisms remain largely unknown. We reported previously that layer 4 (L4) glutamatergic neurons in the mouse barrel cortex exhibit spontaneous activity with a patchwork-type pattern at postnatal day (P)5, which is during barrel formation. In the current work, we revealed that spontaneous activity in mouse barrel-cortex L4 glutamatergic neurons exhibits at least three phases during the first two weeks of postnatal development. Phase I activity has a patchwork-type pattern and is observed not only at P5, but also P1, before barrel formation. Phase II is found at P9, by which time barrel formation is completed, and exhibits broadly synchronized activity across barrel borders. Phase III emerges around P11 when L4-neuron activity is desynchronized. The Phase I activity, but not Phase II or III activity, is blocked by thalamic inhibition, demonstrating that the Phase I to II transition is associated with loss of thalamic dependency. Dominant-negative (DN)-Rac1 expression in L4 neurons hampers the Phase II to III transition. It also suppresses developmental increases in spine density and excitatory synapses of L4 neurons in the second postnatal week, suggesting that Rac1-mediated synapse maturation could underlie the Phase II to III transition. Our findings revealed the presence of distinct mechanisms for Phase I to II and Phase II to III transition. They also highlighted the role of a small GTPase in the developmental desynchronization of cortical spontaneous activity.</jats:p>\n                  <jats:p>\n                    <jats:bold>SIGNIFICANCE STATEMENT</jats:bold>\n                    Developing neocortex exhibits spatially-organized spontaneous activity, which plays a critical role in cortical circuit development. The features of spontaneous-activity spatial organization and the mechanisms underlying its changes during development remain largely unknown. In the present study, using two-photon\n                    <jats:italic>in vivo</jats:italic>\n                    imaging, we revealed three phases (Phases I, II, and III) of spontaneous activity in barrel-cortex layer 4 (L4) glutamatergic neurons during the first two postnatal weeks. We also demonstrated the presence of distinct mechanisms underlying phase transitions. Phase I to II shift arose from the switch in the L4-neuron driving source, and Phase II to III transition relied on L4-neuron Rac1 activity. These results provide new insights into the principles of developmental transitions of neocortical spontaneous-activity spatial patterns.\n                  </jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380009142492409220","@type":"Researcher","foaf:name":[{"@value":"Shingo Nakazawa"}]},{"@id":"https://cir.nii.ac.jp/crid/1420564276181523968","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"10291907"},{"@type":"NRID","@value":"1000010291907"}],"foaf:name":[{"@value":"Yumiko Yoshimura"}]},{"@id":"https://cir.nii.ac.jp/crid/1380009142492409218","@type":"Researcher","foaf:name":[{"@value":"Masahiro Takagi"}]},{"@id":"https://cir.nii.ac.jp/crid/1380009142492409216","@type":"Researcher","foaf:name":[{"@value":"Hidenobu Mizuno"}]},{"@id":"https://cir.nii.ac.jp/crid/1420001326215876480","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"00311332"},{"@type":"NRID","@value":"1000000311332"},{"@type":"NRID","@value":"9000015236491"},{"@type":"NRID","@value":"9000000491961"},{"@type":"NRID","@value":"9000413486162"},{"@type":"NRID","@value":"9000345398019"},{"@type":"NRID","@value":"9000278466603"},{"@type":"NRID","@value":"9000253107282"},{"@type":"NRID","@value":"9000409321609"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/takujiiwasato"}],"foaf:name":[{"@value":"Takuji Iwasato"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"02706474"},{"@type":"EISSN","@value":"15292401"}],"prism:publicationName":[{"@value":"The Journal of Neuroscience"}],"dc:publisher":[{"@value":"Society for Neuroscience"}],"prism:publicationDate":"2020-09-04","prism:volume":"40","prism:number":"40","prism:startingPage":"7637","prism:endingPage":"7650"},"reviewed":"false","dc:rights":["https://creativecommons.org/licenses/by-nc-sa/4.0/"],"url":[{"@id":"https://syndication.highwire.org/content/doi/10.1523/JNEUROSCI.1116-20.2020"}],"createdAt":"2020-09-04","modifiedAt":"2023-04-18","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=Neurons","dc:title":"Neurons"},{"@id":"https://cir.nii.ac.jp/all?q=rac1%20GTP-Binding%20Protein","dc:title":"rac1 GTP-Binding Protein"},{"@id":"https://cir.nii.ac.jp/all?q=Neurogenesis","dc:title":"Neurogenesis"},{"@id":"https://cir.nii.ac.jp/all?q=Neuropeptides","dc:title":"Neuropeptides"},{"@id":"https://cir.nii.ac.jp/all?q=Glutamic%20Acid","dc:title":"Glutamic Acid"},{"@id":"https://cir.nii.ac.jp/all?q=Somatosensory%20Cortex","dc:title":"Somatosensory Cortex"},{"@id":"https://cir.nii.ac.jp/all?q=Membrane%20Potentials","dc:title":"Membrane 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