Understanding Synapses in the Brain...5 April 2019 NSF Workshop NeuroNex Award No.1707356 NSF...
Transcript of Understanding Synapses in the Brain...5 April 2019 NSF Workshop NeuroNex Award No.1707356 NSF...
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Understanding Synapses in the Brain
Kristen HarrisDept. of Neuroscience
Center for Learning and Memory
UT Austin
James CarsonTexas Advanced Computing Center
UT Austin
Terrence Sejnowski
Salk Institute for Biological Studies
5 April 2019 NSF Large Facilities Workshop – Austin
Envisioning the future of facility science and cyberinfrastructure
NeuroNex Award No.1707356
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UT- Austin:
Kristen Harris
John Mendenhall
Masaaki Kuwajima
Lyndsey Kirk
Olga Ostrovskaya
Patrick Parker
Clayton Smith
Dusten Hubbard
Dakota Hanka
Matthew Hopper
Zean Aaron Luna
Anna-Maria Escherich
(Enabling publications
with former Postdocs,
Graduate and
Undergraduate Students)
TACC:
James Carson
Tracy Brown
Joe Stubbs
Joseph Meiring
(Advanced Computing
Interfaces Team)
Salk:
Terry Sejnowski
Tom Bartol
Bob Kuczewski
Mohammad Samavat
(Uri Manor – Imaging
Center Director)
Pittsburgh:
Art Wetzel
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5 April 2019 NSF Workshop
NeuroNex Award No.1707356
Goals for Today
• What is a Synapse?
• How does coordination with a cyberinfrastructure facility help us to understand synapses.
2013 Kuwajima, Spacek, Harris
Neuroscience 251:75
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Synapses are the sites of communication between neurons.
Neuron Cell Body
Dendrites
DendritesDendritic
Spine
AxonalBouton
Adult RatLight Microscopy –Golgi preparation (Harris, 1980)
Axons
Neuropil
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Diseases of Dendrites and Spines
Modified from Fiala, Spacek, Harris 2002, Brain Res. Rev. 39:29-54.
Normal
6 months
Mentally Retarded
12 months
Purpura 1974
Epilepsy
Adult
Alzheimer’s
Adult
Schiebel 1983, 1986
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Light Microscopy Provides
- Large fields
- Visualization of living cells over time
- But, not enough resolution to study synapses.
- Need Electron Microscopy (EM)
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Synapses on Dendritic Spines in EM
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1 micron
PSD
Glia
Axon
Spine
Dendrite
Glia
Mitochondrion
Adult Rat
Spine Apparatus
10% of spines
vesicles
Synapses on Dendritic Spines in EM
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1 cubic micron
3D of these Synapses
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John Fiala
Harris Lab
1999…
http://synapseweb.clm.utexas.edu > Tools > Software
3DEM reveals subcellular resources in context of synapses
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Cruise Through Hippocampal NeuropilCredits
University of Texas at Austin
Josef Spacek, Kristen Harris, Larry Lindsey, Patrick Parker
Chandra Bajaj, Jarred Bowden
The Salk Institute
Justin Kinney*, Tom Bartol, Terry Sejnowski
Dan Keller, Varum Chaturvedi3D – Blender
Music by: Camille Saint Saëns, Carnival of the Animals, Aquarium
Available: YouTube – 2014 New York World Science Festival with narration
https://www.youtube.com/watch?v=hpxHSISSUes&feature=youtu.be
Or on SynapseWeb with other tutorials:
https://synapseweb.clm.utexas.edu/tutorials - bottom of the page.
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Josef Spacek
Charles University
Hradec Kralovè
Czech Republic
First fully reconstructed volume.
Perfused 1984(~180 µm3)
Harris et al. (2015) (Nature) Sci. Data
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~500 (498) synapses in volume = 1 RBC!!
Harris et al. (2015) (Nature) Sci. DataMany papers have resulted from sharing this dataset.
Repeat ~8 trillion times for 1 human brain (1500 cm3)Current methods, > 8 trillion years of human labor!
(~180 µm3)
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5 April 2019 NSF Workshop
NeuroNex Award No.1707356
NSF NeuroNex HubMotivation:
• Variance in synapses is not known.• dimensions, connectivity, and content across cell
types, brain regions, species….
• Knowledge needed to assess if model systems represent human brain synaptic functions.
• Current approaches are limited by • resolution
• inefficient and insufficient data collection
• analysis bottlenecks
• use and dissemination of data and knowledge
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5 April 2019 NSF Workshop
NeuroNex Award No.1707356
NSF NeuroNex HubAims:
1) Collect, compare, and share nanoscale volumes of synaptic neuropil across brain regions and species.
2) Improve axial resolution with tilt tomography on the scanning electron microscope.
3) Integrate and test software tools to enhance analysis of synaptic neuropil.
4) Integrate and disseminate enhanced imaging output and tools with high performance computing.
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NSF NeuroNex HubProgress so far
• First Human tSEM series posted • Designed and implemented “tomoSEM”• Collected 1st conical tilt images• Launched Portal at TACC• Procured new tSEM and ultramicrotome• Refined en bloc staining• Refined Neuropil Tools and Virtual Ultramicrotome• Initiated ReconstructJAVA with SWiFT-IR alignment• Created Github sites for software development • Created Github testbeds for data sharing• Held first community workshop at UT-Austin• Initiated multiple collaborations• Attended Brain Initiative meeting• Publishing papers, talks, and conferences
(Details on pages 2-3/17 annual report and 2-4/18 interim report.)
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Scanning Electron Microscopy in the Transmission Mode
(tSEM)
Kuwajima, Mendenhall, Lindsey, Harris (2013) PLOS 1
John MendenhallMasa Kuwajima
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Maintains resolution
needed to identify
and measure
organelles.
Kuwajima M, Mendenhall JM, Lindsey LF, Harris KM (2013)Randy Chitwood, UT-Austin
Standard
TEM field
tSEM
field
Kuwajima, Mendenhall, Lindsey, Harris (2013)
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5 April 2019 NSF Workshop
NeuroNex Award No.1707356
Human Neocortex Location: Epitumorous Temporal Lobe
Josef Špaček – MRI of tumor Yellow dot, location
Woman 56, anaplastic astrocytoma
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5 April 2019 NSF Workshop
NeuroNex Award No.1707356
Human NeocortexSeries Location: Layer II
˿
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Aligned and cropped using TrakEM2
Human NeocortexLayer II
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Human Neocortex – Layer IIGreat tissue preservation
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Human Neocortex – Layer IIGreat tissue preservation
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Human Neocortex – Layer IIGreat tissue preservation
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5 April 2019 NSF Workshop
NeuroNex Award No.1707356
Integrate Cell Biology in Understanding Neural Circuits
SER+
PR+
PR-
SER-
0.125 μm3
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Need EM Tomography
0.5 µm
Where to place SER membrane traces
and compute volumes and surfaces?
E.g. to know the spine apparatus
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EM Tomography needed even for thin sections – 50 nm:
0.5 µm
Thin cut sections ~50 nm: Fragile and still obscure
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ves
ecssa
mt
• 150 nm thick section
• 15 nm virtual sections
• Limitation:
• small field size (~1 µm2)
pr
TEM TomographyReveals obscured ultrastructure.
ast
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• Large field
• 2,500 -10,000 µm2
• Fewer, thicker sections (250 nm)• 40 instead of 200 serial sections
• Less human cut time
• Stronger sections
• En bloc stain homogeneity
• Few or no flaws
• 10-15 nm virtual z• Reveals buried structures
• Better auto-segmentation
• Total Images (no big deal):• 40 sections * 25 image / section = 1000
• Automatable for multi-image,
• Multi-section, multi-grid
• Human time minimal – setup
tomoSEM (Tomography in tSEM)
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5 April 2019 NSF Workshop
NeuroNex Award No.1707356
tomoSEMConical Tomography:
• Single tilt Angle
• One dynamic focus transform
• Conventional stage and detector
• Rotation to 220 degrees.
• Rotation 360 degrees if flip the grid.
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5 April 2019 NSF Workshop
NeuroNex Award No.1707356
Equal time and advantages
• Tilt tomography proposes 5x fewer sections cut for
same total tissue volume
• Requires 5x more images for total volume than
conventional ssTEM
• Results in thinner virtual sections
• More accurate identifications and measurements
• Improved auto-segmentation
18 nm virtual section 45 nm section 250 nm section
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Conical tomography acquisition:
Sequential tSEM images acquired at single tilted
plane by rotation around ROI.
Zeiss
Merlin field emission SEM
A-STEM detector
Custom Grid holder
5 axis eucentric stage
John Yorston
Kirk Cyzmmek
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Conical tomography acquisition:
Sequential tSEM images acquired at single tilted
plane by rotation around ROI.
Zeiss
Merlin field emission SEM
A-STEM detector
Custom Grid holder
5 axis eucentric stage
John Yorston
Kirk Cyzmmek
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First Conical Tilt images:Maintained ROI
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High Mag
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5 April 2019 NSF Workshop
NeuroNex Award No.1707356
tSEM of 250 nm thick sections
• 15 kV – good contrast, signal throughout section depth.
• Can recognize many structures in regions of interest.
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5 April 2019 NSF Workshop
NeuroNex Award No.1707356
tSEM of 250 nm thick section
• Can even recognize spine apparatuses (SA)
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5 April 2019 NSF Workshop
NeuroNex Award No.1707356
Next Goal for tomoSEM: (Techniques in hand)
Resolution (pixel size): X-Y = 2 nm, Z = 10-15 nm
X-Y field: 2,500 -10,000 µm2
Total extent in Z: 200 @250nm = 50 µm
Total tomoSEM Volume: 500,000 –1,000,000 µm3
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5 April 2019 NSF Workshop
NeuroNex Award No.1707356
Aim 3:
• Integrate and test software tools to enhance analysis of synaptic neuropil.
• Developed in Sejnowski Lab• Tested in Harris Lab• To be Shared on TACC - Carson
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5 April 2019 NSF Workshop
NeuroNex Award No.1707356
Neuropil Tools for Accurate Surface Areas – Axon example:
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5 April 2019 NSF Workshop
NeuroNex Award No.1707356
Expanded Analyses of Storage Capacity of Hippocampal Synapses:
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5 April 2019 NSF Workshop
NeuroNex Award No.1707356
Modeling Synaptic Activity in Sleep sharp wave (REM-memory)
Bartol and Sejnowski, SalkBlender and MCell modeling
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Aim 4:
• Interactive Portal (3DEM.org)
• Live link to EM images
• Incorporate 3DEM tools
• Add community tools
• Workshops and Hackathons
• Disseminate content
• Online tutorials
• Broaden access to 3DEM.org
• Now for James Carson and the portal.