Source 1primary paper2018eLife
Toolkit/genetically encoded dopamine indicators
genetically encoded dopamine indicators
Taxonomy: Technique Branch / Method. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
Here, we monitor genetically encoded DA and calcium indicators as well as cFos in mice
Usefulness & Problems
Why this is useful
This tool class is used to monitor dopamine-related signals in mice during the study.; monitoring dopamine-related signals in mice
Source:
This tool class is used to monitor dopamine-related signals in mice during the study.
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monitoring dopamine-related signals in mice
Problem solved
It provides a way to observe dopamine dynamics while testing heroin-responsive circuitry.; enables monitoring of dopamine signals during heroin-related circuit experiments
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It provides a way to observe dopamine dynamics while testing heroin-responsive circuitry.
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enables monitoring of dopamine signals during heroin-related circuit experiments
Problem links
enables monitoring of dopamine signals during heroin-related circuit experiments
LiteratureIt provides a way to observe dopamine dynamics while testing heroin-responsive circuitry.
Source:
It provides a way to observe dopamine dynamics while testing heroin-responsive circuitry.
Published Workflows
Objective: Determine whether heroin reinforcement is mediated by a specific subset of ventral tegmental area dopamine neurons and test the causal circuit mechanism underlying opioid reinforcement.
Why it works: The study combines observational readouts of heroin-activated neurons with causal perturbations of VTA dopamine and GABA neurons, allowing the authors to connect activation patterns to reinforcement behavior and a disinhibition model.
activation of medial VTA dopamine neurons projecting to medial nucleus accumbens shelldisinhibition of a subset of VTA dopamine neuronsinvolvement of VTA GABA neurons in opioid reinforcementgenetically encoded dopamine monitoringgenetically encoded calcium monitoringcFos mappingchemogenetic manipulationoptogenetic manipulation
Stages
- 1.Monitoring heroin-responsive circuitry(functional_characterization)
This stage identifies which dopamine neurons and projection-defined populations are activated by heroin before causal perturbation experiments.
Selection: Identify dopamine neurons and related circuit activity patterns activated by heroin.
- 2.Causal perturbation of VTA dopamine and GABA neurons(confirmatory_validation)
This stage tests whether the neurons identified in the monitoring stage are causally involved in heroin reinforcement.
Selection: Test whether manipulating VTA dopamine or GABA neurons changes heroin reinforcement behavior.
Steps
- 1.Monitor genetically encoded dopamine and calcium indicators plus cFos after heroin exposureassay readouts
Identify heroin-activated neurons and circuit features in mice.
Observational mapping is used first to reveal which neuron populations are activated by heroin before causal perturbation is applied.
- 2.Apply chemogenetic and optogenetic manipulations to test causal roles in heroin reinforcementcausal perturbation methods
Determine whether VTA dopamine or GABA neurons causally mediate heroin reinforcement.
After identifying heroin-responsive circuitry, causal perturbation is used to test whether those neuron populations are necessary or behaviorally relevant for reinforcement.
Taxonomy & Function
Primary hierarchy
Technique Branch
Method: A concrete measurement method used to characterize an engineered system.
Techniques
Functional AssayTarget processes
No target processes tagged yet.
Implementation Constraints
cofactor dependency: cofactor requirement unknownencoding mode: genetically encodedimplementation constraint: context specific validationoperating role: sensor
It requires a genetically encoded dopamine indicator to be present in the relevant cells or circuit.; requires genetically encoded indicator expression in the experimental system
Independent follow-up evidence is still limited. Validation breadth across biological contexts is still narrow. Independent reuse still looks limited, so the evidence base may be fragile. No canonical validation observations are stored yet, so context-specific performance remains under-specified.
Validation
Cell-freeBacteriaMammalianMouseHumanTherapeuticIndep. Replication
Supporting Sources
Ranked Claims
Chemogenetic and optogenetic manipulations of ventral tegmental area dopamine or GABA neurons establish a causal link to heroin reinforcement.
Chemogenetic and optogenetic manipulations of VTA DA or GABA neurons establish a causal link to heroin reinforcement.
Inhibition of ventral tegmental area dopamine neurons blocks heroin self-administration.
Inhibition of DA neurons blocked heroin self-administration
Heroin activates dopamine neurons in the medial ventral tegmental area that preferentially project to the medial shell of the nucleus accumbens.
Here, we monitor genetically encoded DA and calcium indicators as well as cFos in mice to reveal that heroin activates DA neurons located in the medial part of the VTA, preferentially projecting to the medial shell of the nucleus accumbens (NAc).
Approval Evidence
1 source1 linked approval claimfirst-pass slug genetically-encoded-dopamine-indicators
Here, we monitor genetically encoded DA and calcium indicators as well as cFos in mice
Source:
mechanistic findingsupports
Heroin activates dopamine neurons in the medial ventral tegmental area that preferentially project to the medial shell of the nucleus accumbens.
Here, we monitor genetically encoded DA and calcium indicators as well as cFos in mice to reveal that heroin activates DA neurons located in the medial part of the VTA, preferentially projecting to the medial shell of the nucleus accumbens (NAc).
Source:
Comparisons
Source-backed strengths
genetically encoded readout is compatible with in vivo monitoring
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genetically encoded readout is compatible with in vivo monitoring
Compared with Langendorff perfused heart electrical recordings
genetically encoded dopamine indicators and Langendorff perfused heart electrical recordings address a similar problem space.
Shared frame: same top-level item type
Strengths here: looks easier to implement in practice.
Compared with native green gel system
genetically encoded dopamine indicators and native green gel system address a similar problem space.
Shared frame: same top-level item type
Strengths here: looks easier to implement in practice.
genetically encoded dopamine indicators and sub-picosecond pump-probe analysis of bacteriorhodopsin pigments address a similar problem space.
Shared frame: same top-level item type
Strengths here: looks easier to implement in practice.
Ranked Citations
- 1.