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Proteome-wide Quantification of Labeling Homogeneity at the Single Molecule Level
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Clarifying CLARITY: Quantitative Optimization of the Diffusion Based Delipidation Protocol for Genetically Labeled

Chiara Magliaro1, Alejandro L Callara1, Giorgio Mattei1

  • 1Research Center "E. Piaggio", University of Pisa Pisa, Italy.

Frontiers in Neuroscience
|May 21, 2016
PubMed
Summary

Determining optimal tissue clearing time is crucial for deep tissue imaging. This study quantifies clearing parameters to balance transparency and fluorescent signal retention in genetically labeled mouse brain slices.

Keywords:
CLARITYGFPimage processingmouse brain slicesquantitative protocol optimization

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Area of Science:

  • Neuroscience
  • Biotechnology
  • Microscopy

Background:

  • Tissue clarification techniques enable deep tissue imaging by reducing light scattering.
  • Current protocols lack quantitative methods for optimizing clearing time, leading to variable results.
  • Genetically encoded fluorescent proteins are widely used for visualizing specific cell populations in tissues.

Purpose of the Study:

  • To develop and validate a quantitative approach for determining the optimal clearing time for thick murine brain slices.
  • To balance tissue transparency with the retention of fluorescent signal in genetically labeled neurons.
  • To establish a generalized method applicable to various tissue clarification protocols.

Main Methods:

  • Utilized CLARITY2 for tissue delipidation of 1 mm-thick cerebellar slices from L7-GFP transgenic mice.
  • Quantified "goodness" of clarification using bulk tissue clarification index (BTCi) and fluorescent marker retention.
  • Assessed image quality of confocal stacks using mean pixel intensity and contrast-to-noise ratio.

Main Results:

  • Detergent-based delipidation beyond 5 days did not improve tissue clarity but decreased fluorescent signal (GFP retention).
  • Optimal clearing time for 1 mm slices was identified as 5 days, balancing light penetration and signal loss.
  • Image quality metrics confirmed that extended clearing times lead to protein loss without enhancing transparency.

Conclusions:

  • A quantitative method for optimizing tissue clearing time is essential to prevent unnecessary protein degradation.
  • The identified 5-day clearing time represents a critical balance for preserving fluorescent signal in thick brain slices.
  • This approach can be adapted for any tissue clarification method to determine optimal processing duration.