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Genetically Encoded Fluorescent Indicators for Organellar Calcium Imaging.

Junji Suzuki1, Kazunori Kanemaru2, Masamitsu Iino3

  • 1Department of Pharmacology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan; Department of Physiology, University of California San Francisco, San Francisco, California.

Biophysical Journal
|August 2, 2016
PubMed
Summary

Genetically encoded calcium indicators (GECIs) offer advanced organellar calcium imaging. This review details GECI development, requirements, and future directions for understanding intracellular calcium signaling.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Imaging

Background:

  • Intracellular calcium (Ca2+) signals regulate vital cellular processes.
  • Investigating organellar Ca2+ dynamics is crucial but challenging.
  • Existing Ca2+ indicators have limitations for organelle-specific studies.

Purpose of the Study:

  • To review advancements in genetically encoded Ca2+ indicators (GECIs) for organellar imaging.
  • To outline requirements for effective organellar Ca2+ indicators.
  • To discuss future directions for GECI development in organelle research.

Main Methods:

  • Review of literature on genetically encoded Ca2+ indicators.
  • Analysis of engineering strategies for fluorescent protein-based indicators.
  • Discussion of targeting mechanisms for specific organelles.

Main Results:

  • Genetically encoded Ca2+ indicators (GECIs) show promise for organellar Ca2+ imaging.
  • Recent engineering efforts have improved targeting and sensitivity of GECIs.
  • Key requirements for optimal organellar GECIs include specificity, sensitivity, and minimal perturbation.

Conclusions:

  • GECIs are essential tools for deciphering organellar Ca2+ signaling.
  • Further development is needed to overcome limitations in current GECIs.
  • Advancing GECI technology will enhance understanding of cellular physiology and disease.