---
_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'
...