--- _id: '693' abstract: - lang: eng text: 'Many central synapses contain a single presynaptic active zone and a single postsynaptic density. Vesicular release statistics at such “simple synapses” indicate that they contain a small complement of docking sites where vesicles repetitively dock and fuse. In this work, we investigate functional and morphological aspects of docking sites at simple synapses made between cerebellar parallel fibers and molecular layer interneurons. Using immunogold labeling of SDS-treated freeze-fracture replicas, we find that Cav2.1 channels form several clusters per active zone with about nine channels per cluster. The mean value and range of intersynaptic variation are similar for Cav2.1 cluster numbers and for functional estimates of docking-site numbers obtained from the maximum numbers of released vesicles per action potential. Both numbers grow in relation with synaptic size and decrease by a similar extent with age between 2 wk and 4 wk postnatal. Thus, the mean docking-site numbers were 3.15 at 2 wk (range: 1–10) and 2.03 at 4 wk (range: 1–4), whereas the mean numbers of Cav2.1 clusters were 2.84 at 2 wk (range: 1–8) and 2.37 at 4 wk (range: 1–5). These changes were accompanied by decreases of miniature current amplitude (from 93 pA to 56 pA), active-zone surface area (from 0.0427 μm2 to 0.0234 μm2), and initial success rate (from 0.609 to 0.353), indicating a tightening of synaptic transmission with development. Altogether, these results suggest a close correspondence between the number of functionally defined vesicular docking sites and that of clusters of voltage-gated calcium channels. ' article_processing_charge: Yes (in subscription journal) author: - first_name: Takafumi full_name: Miki, Takafumi last_name: Miki - first_name: Walter full_name: Kaufmann, Walter id: 3F99E422-F248-11E8-B48F-1D18A9856A87 last_name: Kaufmann orcid: 0000-0001-9735-5315 - first_name: Gerardo full_name: Malagon, Gerardo last_name: Malagon - first_name: Laura full_name: Gomez, Laura last_name: Gomez - first_name: Katsuhiko full_name: Tabuchi, Katsuhiko last_name: Tabuchi - first_name: Masahiko full_name: Watanabe, Masahiko last_name: Watanabe - first_name: Ryuichi full_name: Shigemoto, Ryuichi id: 499F3ABC-F248-11E8-B48F-1D18A9856A87 last_name: Shigemoto orcid: 0000-0001-8761-9444 - first_name: Alain full_name: Marty, Alain last_name: Marty citation: ama: Miki T, Kaufmann W, Malagon G, et al. Numbers of presynaptic Ca2+ channel clusters match those of functionally defined vesicular docking sites in single central synapses. PNAS. 2017;114(26):E5246-E5255. doi:10.1073/pnas.1704470114 apa: Miki, T., Kaufmann, W., Malagon, G., Gomez, L., Tabuchi, K., Watanabe, M., … Marty, A. (2017). Numbers of presynaptic Ca2+ channel clusters match those of functionally defined vesicular docking sites in single central synapses. PNAS. National Academy of Sciences. https://doi.org/10.1073/pnas.1704470114 chicago: Miki, Takafumi, Walter Kaufmann, Gerardo Malagon, Laura Gomez, Katsuhiko Tabuchi, Masahiko Watanabe, Ryuichi Shigemoto, and Alain Marty. “Numbers of Presynaptic Ca2+ Channel Clusters Match Those of Functionally Defined Vesicular Docking Sites in Single Central Synapses.” PNAS. National Academy of Sciences, 2017. https://doi.org/10.1073/pnas.1704470114. ieee: T. Miki et al., “Numbers of presynaptic Ca2+ channel clusters match those of functionally defined vesicular docking sites in single central synapses,” PNAS, vol. 114, no. 26. National Academy of Sciences, pp. E5246–E5255, 2017. ista: Miki T, Kaufmann W, Malagon G, Gomez L, Tabuchi K, Watanabe M, Shigemoto R, Marty A. 2017. Numbers of presynaptic Ca2+ channel clusters match those of functionally defined vesicular docking sites in single central synapses. PNAS. 114(26), E5246–E5255. mla: Miki, Takafumi, et al. “Numbers of Presynaptic Ca2+ Channel Clusters Match Those of Functionally Defined Vesicular Docking Sites in Single Central Synapses.” PNAS, vol. 114, no. 26, National Academy of Sciences, 2017, pp. E5246–55, doi:10.1073/pnas.1704470114. short: T. Miki, W. Kaufmann, G. Malagon, L. Gomez, K. Tabuchi, M. Watanabe, R. Shigemoto, A. Marty, PNAS 114 (2017) E5246–E5255. date_created: 2018-12-11T11:47:57Z date_published: 2017-06-27T00:00:00Z date_updated: 2023-02-23T12:54:57Z day: '27' ddc: - '570' department: - _id: EM-Fac - _id: RySh doi: 10.1073/pnas.1704470114 external_id: pmid: - '28607047' file: - access_level: open_access checksum: 2ab75d554f3df4a34d20fa8040589b7e content_type: application/pdf creator: kschuh date_created: 2020-01-03T13:27:29Z date_updated: 2020-07-14T12:47:44Z file_id: '7223' file_name: 2017_PNAS_Miki.pdf file_size: 2721544 relation: main_file file_date_updated: 2020-07-14T12:47:44Z has_accepted_license: '1' intvolume: ' 114' issue: '26' language: - iso: eng month: '06' oa: 1 oa_version: Published Version page: E5246 - E5255 pmid: 1 publication: PNAS publication_identifier: issn: - '00278424' publication_status: published publisher: National Academy of Sciences publist_id: '7013' quality_controlled: '1' scopus_import: 1 status: public title: Numbers of presynaptic Ca2+ channel clusters match those of functionally defined vesicular docking sites in single central synapses type: journal_article user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87 volume: 114 year: '2017' ...