SEQUIN Multiscale Imaging of Mammalian Central Synapses Reveals Loss of Synaptic Connectivity Resulting from Diffuse Traumatic Brain Injury

Andrew D. Sauerbeck, Mihika Gangolli, Sydney J. Reitz, Maverick H. Salyards, Samuel H. Kim, Christopher Hemingway, Maud Gratuze, Tejaswi Makkapati, Martin Kerschensteiner, David M. Holtzman, David L. Brody, Terrance T. Kummer

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The brain's complex microconnectivity underlies its computational abilities and vulnerability to injury and disease. It has been challenging to illuminate the features of this synaptic network due to the small size and dense packing of its elements. Here, we describe a rapid, accessible super-resolution imaging and analysis workflow—SEQUIN—that quantifies central synapses in human tissue and animal models, characterizes their nanostructural and molecular features, and enables volumetric imaging of mesoscale synaptic networks without the production of large histological arrays. Using SEQUIN, we identify cortical synapse loss resulting from diffuse traumatic brain injury, a highly prevalent connectional disorder. Similar synapse loss is observed in three murine models of Alzheimer-related neurodegeneration, where SEQUIN mesoscale mapping identifies regional synaptic vulnerability. These results establish an easily implemented and robust nano-to-mesoscale synapse quantification and characterization method. They furthermore identify a shared mechanism—synaptopathy—between Alzheimer neurodegeneration and its best-established epigenetic risk factor, brain trauma.

Original languageEnglish
Pages (from-to)257-273.e5
JournalNeuron
Volume107
Issue number2
DOIs
StatePublished - Jul 22 2020

Keywords

  • Alzheimer's disease
  • SEQUIN
  • TBI
  • imaging
  • microconnectivity
  • neurodegeneration
  • super-resolution microscopy
  • synapse
  • synaptome
  • traumatic brain injury

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