Source 1primary paper2022MED
Toolkit/GCaMP
GCaMP
Also known as: green calmodulin fusion protein
Taxonomy: Mechanism Branch / Architecture. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
Development of mice expressing optogenetic sensors (green calmodulin fusion protein (GCaMP), red calmodulin fusion protein (RCaMP)) has allowed visualization of Ca2+ signalling behaviours in a cell specific manner.
Usefulness & Problems
Why this is useful
GCaMP is described as an optogenetic sensor used in mice to visualize Ca2+ signalling behaviours in a cell-specific manner. In the GI tract, GCaMP-expressing animals were used to characterize Ca2+ signalling in distinct ICC and SMC classes.; cell-specific visualization of Ca2+ signalling behaviours in the GI tract; characterizing Ca2+ signalling in distinct classes of ICC and SMCs; GCaMP is presented as a major genetically encoded calcium-indicator family for monitoring neural activity. The review uses it as the main example for discussing sensor design and optimization pipelines.; genetically encoded calcium imaging; sensor optimization case studies; neural circuit activity monitoring
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GCaMP is described as an optogenetic sensor used in mice to visualize Ca2+ signalling behaviours in a cell-specific manner. In the GI tract, GCaMP-expressing animals were used to characterize Ca2+ signalling in distinct ICC and SMC classes.
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cell-specific visualization of Ca2+ signalling behaviours in the GI tract
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characterizing Ca2+ signalling in distinct classes of ICC and SMCs
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GCaMP is presented as a major genetically encoded calcium-indicator family for monitoring neural activity. The review uses it as the main example for discussing sensor design and optimization pipelines.
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genetically encoded calcium imaging
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sensor optimization case studies
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neural circuit activity monitoring
Problem solved
It addresses the inability of indiscriminate Ca2+ dye loading to isolate activity from specific cells within GI tissue preparations.; overcomes lack of cell specificity from indiscriminate Ca2+ dye loading; It addresses the need for genetically targetable optical reporters of activity-related calcium signals in neural circuits.; provides a genetically encoded calcium-indicator family for optical readout of neural activity; serves as an example family for sensor optimization pipelines
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It addresses the inability of indiscriminate Ca2+ dye loading to isolate activity from specific cells within GI tissue preparations.
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overcomes lack of cell specificity from indiscriminate Ca2+ dye loading
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It addresses the need for genetically targetable optical reporters of activity-related calcium signals in neural circuits.
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provides a genetically encoded calcium-indicator family for optical readout of neural activity
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serves as an example family for sensor optimization pipelines
Problem links
overcomes lack of cell specificity from indiscriminate Ca2+ dye loading
LiteratureIt addresses the inability of indiscriminate Ca2+ dye loading to isolate activity from specific cells within GI tissue preparations.
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It addresses the inability of indiscriminate Ca2+ dye loading to isolate activity from specific cells within GI tissue preparations.
provides a genetically encoded calcium-indicator family for optical readout of neural activity
LiteratureIt addresses the need for genetically targetable optical reporters of activity-related calcium signals in neural circuits.
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It addresses the need for genetically targetable optical reporters of activity-related calcium signals in neural circuits.
serves as an example family for sensor optimization pipelines
LiteratureIt addresses the need for genetically targetable optical reporters of activity-related calcium signals in neural circuits.
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It addresses the need for genetically targetable optical reporters of activity-related calcium signals in neural circuits.
Published Workflows
Objective: Optimize genetically encoded neural activity sensors using the GCaMP family as an example.
Why it works: The review explicitly presents GCaMP as an example family for established sensor optimization pipelines and pairs this with practical end-user considerations for delivery, imaging, and analysis.
sensor optimization
Stages
- 1.sensor optimization(functional_characterization)
The review uses GCaMP as an example to discuss established sensor optimization pipelines.
- 2.gene delivery planning(decision_gate)
The review identifies gene delivery approaches as a practical consideration for end users of GINAs.
- 3.imaging system setup(confirmatory_validation)
The review highlights imaging system requirements as a practical determinant of successful GINA use.
- 4.data analysis(secondary_characterization)
The review explicitly includes data analysis techniques among practical methods for end users.
Taxonomy & Function
Primary hierarchy
Mechanism Branch
Architecture: A reusable architecture pattern for arranging parts into an engineered system.
Mechanisms
calcium-dependent fluorescent sensingTechniques
No technique tags yet.
Target processes
No target processes tagged yet.
Input: Light
Implementation Constraints
cofactor dependency: cofactor requirement unknownencoding mode: genetically encodedimplementation constraint: context specific validationimplementation constraint: spectral hardware requirementoperating role: sensor
The abstract supports use in mice expressing GCaMP. It does not provide further implementation details such as promoter, imaging hardware, or delivery method.; requires mice expressing the optogenetic sensor; GCaMP use requires expression in target cells and optical imaging hardware. The abstract places these indicators in workflows involving fluorescence microscopy and practical delivery considerations.; requires DNA encoding and expression in target cells; requires fluorescence imaging instrumentation
The abstract does not support claims that GCaMP manipulates signalling or directly maps circuitry; it is presented as a sensor for visualization.; abstract does not specify sensor variant, targeting strategy, or performance tradeoffs; The abstract does not state specific failure modes or performance limits for GCaMP, so those boundaries are not extracted here.
Validation
Cell-freeBacteriaMammalianMouseHumanTherapeuticIndep. Replication
Supporting Sources
Ranked Claims
Animals expressing channelrhodopsin in specific neuronal populations have been used to map neural circuitry and examine post junctional neural effects on GI motility.
GCaMP-expressing animals have been used to characterize Ca2+ signalling behaviours of distinct classes of interstitial cells of Cajal and smooth muscle cells throughout the GI musculature.
Mice expressing GCaMP or RCaMP allow cell-specific visualization of Ca2+ signalling behaviours in the gastrointestinal tract.
Mice expressing channelrhodopsins or halorhodopsins allow light-based manipulation of specific signalling pathways.
Approval Evidence
2 sources4 linked approval claimsfirst-pass slug gcamp
Development of mice expressing optogenetic sensors (green calmodulin fusion protein (GCaMP), red calmodulin fusion protein (RCaMP)) has allowed visualization of Ca2+ signalling behaviours in a cell specific manner.
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In particular, we take an in-depth look at the design of available GINA families with a particular focus on genetically encoded calcium indicators (GCaMPs)... Using the family of the GCaMP as an example, we review established sensor optimization pipelines.
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applicationsupports
GCaMP-expressing animals have been used to characterize Ca2+ signalling behaviours of distinct classes of interstitial cells of Cajal and smooth muscle cells throughout the GI musculature.
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enables measurementsupports
Mice expressing GCaMP or RCaMP allow cell-specific visualization of Ca2+ signalling behaviours in the gastrointestinal tract.
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review scope summarysupports
The review focuses in depth on GCaMP-family calcium indicators, synaptic activity sensors, and genetically encoded voltage indicators as major GINA classes.
we take an in-depth look at the design of available GINA families with a particular focus on genetically encoded calcium indicators (GCaMPs), sensors probing synaptic activity, and genetically encoded voltage indicators
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workflow summarysupports
The GCaMP family is used by the review as an example for established sensor optimization pipelines.
Using the family of the GCaMP as an example, we review established sensor optimization pipelines.
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Comparisons
Source-stated alternatives
The abstract contrasts GCaMP-based cell-specific imaging with indiscriminate Ca2+ dye loading and also mentions RCaMP as another optogenetic sensor.; The review contrasts GCaMP-family calcium indicators with synaptic activity sensors and genetically encoded voltage indicators, and the supplied summary also points to TN-XXL and Twitch as adjacent calcium-indicator families.
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The abstract contrasts GCaMP-based cell-specific imaging with indiscriminate Ca2+ dye loading and also mentions RCaMP as another optogenetic sensor.
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The review contrasts GCaMP-family calcium indicators with synaptic activity sensors and genetically encoded voltage indicators, and the supplied summary also points to TN-XXL and Twitch as adjacent calcium-indicator families.
Source-backed strengths
enables cell-specific Ca2+ imaging in complex multicellular GI preparations; central and well-developed indicator family in the review; used as the example for established sensor optimization pipelines
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enables cell-specific Ca2+ imaging in complex multicellular GI preparations
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central and well-developed indicator family in the review
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used as the example for established sensor optimization pipelines
Compared with calcium indicators
The review contrasts GCaMP-family calcium indicators with synaptic activity sensors and genetically encoded voltage indicators, and the supplied summary also points to TN-XXL and Twitch as adjacent calcium-indicator families.
Shared frame: source-stated alternative in extracted literature
Strengths here: enables cell-specific Ca2+ imaging in complex multicellular GI preparations; central and well-developed indicator family in the review; used as the example for established sensor optimization pipelines.
Relative tradeoffs: abstract does not specify sensor variant, targeting strategy, or performance tradeoffs.
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The review contrasts GCaMP-family calcium indicators with synaptic activity sensors and genetically encoded voltage indicators, and the supplied summary also points to TN-XXL and Twitch as adjacent calcium-indicator families.
Compared with GCaMP calcium imaging
The abstract contrasts GCaMP-based cell-specific imaging with indiscriminate Ca2+ dye loading and also mentions RCaMP as another optogenetic sensor.; The review contrasts GCaMP-family calcium indicators with synaptic activity sensors and genetically encoded voltage indicators, and the supplied summary also points to TN-XXL and Twitch as adjacent calcium-indicator families.
Shared frame: source-stated alternative in extracted literature
Strengths here: enables cell-specific Ca2+ imaging in complex multicellular GI preparations; central and well-developed indicator family in the review; used as the example for established sensor optimization pipelines.
Relative tradeoffs: abstract does not specify sensor variant, targeting strategy, or performance tradeoffs.
Source:
The abstract contrasts GCaMP-based cell-specific imaging with indiscriminate Ca2+ dye loading and also mentions RCaMP as another optogenetic sensor.
Source:
The review contrasts GCaMP-family calcium indicators with synaptic activity sensors and genetically encoded voltage indicators, and the supplied summary also points to TN-XXL and Twitch as adjacent calcium-indicator families.
Compared with genetically encoded voltage indicators
The review contrasts GCaMP-family calcium indicators with synaptic activity sensors and genetically encoded voltage indicators, and the supplied summary also points to TN-XXL and Twitch as adjacent calcium-indicator families.
Shared frame: source-stated alternative in extracted literature
Strengths here: enables cell-specific Ca2+ imaging in complex multicellular GI preparations; central and well-developed indicator family in the review; used as the example for established sensor optimization pipelines.
Relative tradeoffs: abstract does not specify sensor variant, targeting strategy, or performance tradeoffs.
Source:
The review contrasts GCaMP-family calcium indicators with synaptic activity sensors and genetically encoded voltage indicators, and the supplied summary also points to TN-XXL and Twitch as adjacent calcium-indicator families.
Compared with imaging
The abstract contrasts GCaMP-based cell-specific imaging with indiscriminate Ca2+ dye loading and also mentions RCaMP as another optogenetic sensor.
Shared frame: source-stated alternative in extracted literature
Strengths here: enables cell-specific Ca2+ imaging in complex multicellular GI preparations; central and well-developed indicator family in the review; used as the example for established sensor optimization pipelines.
Relative tradeoffs: abstract does not specify sensor variant, targeting strategy, or performance tradeoffs.
Source:
The abstract contrasts GCaMP-based cell-specific imaging with indiscriminate Ca2+ dye loading and also mentions RCaMP as another optogenetic sensor.
Compared with imaging surveillance
The abstract contrasts GCaMP-based cell-specific imaging with indiscriminate Ca2+ dye loading and also mentions RCaMP as another optogenetic sensor.
Shared frame: source-stated alternative in extracted literature
Strengths here: enables cell-specific Ca2+ imaging in complex multicellular GI preparations; central and well-developed indicator family in the review; used as the example for established sensor optimization pipelines.
Relative tradeoffs: abstract does not specify sensor variant, targeting strategy, or performance tradeoffs.
Source:
The abstract contrasts GCaMP-based cell-specific imaging with indiscriminate Ca2+ dye loading and also mentions RCaMP as another optogenetic sensor.
Compared with optogenetic
The abstract contrasts GCaMP-based cell-specific imaging with indiscriminate Ca2+ dye loading and also mentions RCaMP as another optogenetic sensor.
Shared frame: source-stated alternative in extracted literature
Strengths here: enables cell-specific Ca2+ imaging in complex multicellular GI preparations; central and well-developed indicator family in the review; used as the example for established sensor optimization pipelines.
Relative tradeoffs: abstract does not specify sensor variant, targeting strategy, or performance tradeoffs.
Source:
The abstract contrasts GCaMP-based cell-specific imaging with indiscriminate Ca2+ dye loading and also mentions RCaMP as another optogenetic sensor.
Compared with RCaMP
The abstract contrasts GCaMP-based cell-specific imaging with indiscriminate Ca2+ dye loading and also mentions RCaMP as another optogenetic sensor.
Shared frame: source-stated alternative in extracted literature
Strengths here: enables cell-specific Ca2+ imaging in complex multicellular GI preparations; central and well-developed indicator family in the review; used as the example for established sensor optimization pipelines.
Relative tradeoffs: abstract does not specify sensor variant, targeting strategy, or performance tradeoffs.
Source:
The abstract contrasts GCaMP-based cell-specific imaging with indiscriminate Ca2+ dye loading and also mentions RCaMP as another optogenetic sensor.
Compared with voltage indicators
The review contrasts GCaMP-family calcium indicators with synaptic activity sensors and genetically encoded voltage indicators, and the supplied summary also points to TN-XXL and Twitch as adjacent calcium-indicator families.
Shared frame: source-stated alternative in extracted literature
Strengths here: enables cell-specific Ca2+ imaging in complex multicellular GI preparations; central and well-developed indicator family in the review; used as the example for established sensor optimization pipelines.
Relative tradeoffs: abstract does not specify sensor variant, targeting strategy, or performance tradeoffs.
Source:
The review contrasts GCaMP-family calcium indicators with synaptic activity sensors and genetically encoded voltage indicators, and the supplied summary also points to TN-XXL and Twitch as adjacent calcium-indicator families.
Ranked Citations
- 1.