ZFIN ID: ZDB-PUB-181027-4
Improved methods for marking active neuron populations
Moeyaert, B., Holt, G., Madangopal, R., Perez-Alvarez, A., Fearey, B.C., Trojanowski, N.F., Ledderose, J., Zolnik, T.A., Das, A., Patel, D., Brown, T.A., Sachdev, R.N.S., Eickholt, B.J., Larkum, M.E., Turrigiano, G.G., Dana, H., Gee, C.E., Oertner, T.G., Hope, B.T., Schreiter, E.R.
Date: 2018
Source: Nature communications   9: 4440 (Journal)
Registered Authors: Ledderose, Julia
Keywords: none
MeSH Terms:
  • Animals
  • Antibodies/metabolism
  • Fluorescence
  • HeLa Cells
  • Humans
  • Light
  • Luminescent Proteins/metabolism
  • Mice
  • Neurons/cytology
  • Neurons/metabolism*
  • Protein Engineering/methods*
  • Rats, Wistar
  • Visual Cortex/metabolism
  • Zebrafish/metabolism
PubMed: 30361563 Full text @ Nat. Commun.
Marking functionally distinct neuronal ensembles with high spatiotemporal resolution is a key challenge in systems neuroscience. We recently introduced CaMPARI, an engineered fluorescent protein whose green-to-red photoconversion depends on simultaneous light exposure and elevated calcium, which enabled marking active neuronal populations with single-cell and subsecond resolution. However, CaMPARI (CaMPARI1) has several drawbacks, including background photoconversion in low calcium, slow kinetics and reduced fluorescence after chemical fixation. In this work, we develop CaMPARI2, an improved sensor with brighter green and red fluorescence, faster calcium unbinding kinetics and decreased photoconversion in low calcium conditions. We demonstrate the improved performance of CaMPARI2 in mammalian neurons and in vivo in larval zebrafish brain and mouse visual cortex. Additionally, we herein develop an immunohistochemical detection method for specific labeling of the photoconverted red form of CaMPARI. The anti-CaMPARI-red antibody provides strong labeling that is selective for photoconverted CaMPARI in activated neurons in rodent brain tissue.