Cited by 2,008Advanced Fluorescence Microscopy TechniquesCell Image Analysis TechniquesSingle-cell and spatial transcriptomics

Structural and molecular interrogation of intact biological systems

Open access
Chung, Kwanghun, Wallace, Jenelle, Kim, Sung-Yon, Kalyanasundaram, Sandhiya, Andalman, Aaron S., Davidson, Thomas J., Mirzabekov, Julie J., Zalocusky, Kelly A. +8 more·2013·Nature

Abstract

Obtaining high-resolution information from a complex system, while maintaining the global perspective needed to understand system function, represents a key challenge in biology. Here we address this challenge with a method (termed CLARITY) for the transformation of intact tissue into a nanoporous hydrogel-hybridized form (crosslinked to a three-dimensional network of hydrophilic polymers) that is fully assembled but optically transparent and macromolecule-permeable. Using mouse brains, we show intact-tissue imaging of long-range projections, local circuit wiring, cellular relationships, subcellular structures, protein complexes, nucleic acids and neurotransmitters. CLARITY also enables intact-tissue in situ hybridization, immunohistochemistry with multiple rounds of staining and de-staining in non-sectioned tissue, and antibody labelling throughout the intact adult mouse brain. Finally, we show that CLARITY enables fine structural analysis of clinical samples, including non-sectioned human tissue from a neuropsychiatric-disease setting, establishing a path for the transmutation of human tissue into a stable, intact and accessible form suitable for probing structural and molecular underpinnings of physiological function and disease.

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  • CLARITY is a clearing technique that transforms intact brain tissue into nanoporous, lipid-free, hydrogel-tissue hybrids that are optically transparent but macromolecule permeable.

    “Clear Lipid-exchanged, Anatomically Rigid, Imaging/immunostaining compatible, Tissue hYdrogel (CLARITY; Chung et al., 2013) is a clearing technique that transforms intact brain tissue into nanoporous, lipid-free, hydrogel-tissue hydrids that are optically transparent but macromolecule permeable.”

    From The role of myelination in measures of white matter integrity: Combination of diffusion tensor imaging and two-photon microscopy of CLARITY intact brains (2017) · cites this paper as Chung et al., 2013

    The Abstract describes CLARITY as transforming intact tissue into a nanoporous, optically transparent, macromolecule-permeable hydrogel hybrid; the ‘Hydrogel-electrophoretic tissue transmutation’ section describes lipid extraction. However, the citing sentence expands the acronym differently from the paper’s Methods > CLARITY section, which specifies ‘Acrylamide-hybridized Rigid’ rather than ‘Anatomically Rigid.’ (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • CLARITY could be successfully performed despite the presence of a contrast agent in the hydrogel and minor deviations from the original published protocol.

    “This demonstrated that CLARITY could be successfully performed despite the presence of a contrast agent in the hydrogel and minor deviations from the original published protocol (Chung et al., 2013).”
  • CLARITY achieves tissue transparency to enable deep laser penetration in normally highly light-scattering mouse brains, while preserving proteins in situ and the native 3D structure of brain tissue.

    “CLARITY achieves tissue transparency to enable deep laser penetration in normally highly light-scattering mouse brains, while preserving proteins in situ and the native 3D structure of brain tissue.”

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Authors
Chung, K., Wallace, J., Kim, S.-Y., Kalyanasundaram, S., Andalman, A. S., Davidson, T. J., Mirzabekov, J. J., Zalocusky, K. A., Mattis, J., Denisin, A. K., Pak, S., Bernstein, H., Ramakrishnan, C., Grosenick, L., Gradinaru, V., & Deisseroth, K.
Affiliations
  • Stanford University (US)
  • Howard Hughes Medical Institute (US)
Corresponding author
Deisseroth, Karl
Venue
Nature
Published
2013-04-10
Volume
497
Issue
7449
Pages
332-337
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2076507262
Cited by
2,008
References
4
Citations by year
2026: 83 · 2025: 112 · 2024: 115 · 2023: 104 · 2022: 144 · 2021: 183 · 2020: 187 · 2019: 164 · 2018: 185 · 2017: 165 · 2016: 187 · 2015: 170 · 2014: 129 · 2013: 78
FWCI
114.01
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • National Science Foundation
  • Howard Hughes Medical Institute
  • National Institutes of Health (DP1OD000616)
  • Defense Advanced Research Projects Agency
  • Samsung
  • National Institute of Mental Health (R01MH099647)
  • National Institute on Drug Abuse (R01DA020794, R37DA035377)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Advanced Fluorescence Microscopy Techniques
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Cell Image Analysis Techniques
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Single-cell and spatial transcriptomics
Keywords
clarity, tissue transparency, hydrogel crosslinking, macromolecule permeability, mouse brain, human brain tissue, in situ hybridization, antibody labeling, lipid removal, formalin-fixed tissue, neuropsychiatric disorders
MeSH terms
Animals, Brain, Cross-Linking Reagents, Formaldehyde, Humans, Lipids, Permeability, Phenotype, Scattering, Radiation, In Situ Hybridization, Hydrogel, Polyethylene Glycol Dimethacrylate, Imaging, Three-Dimensional, Mice, Molecular Imaging

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