Source 1primary paper2019eLife
Toolkit/whole-brain axonal projection mapping
whole-brain axonal projection mapping
Taxonomy: Technique Branch / Method. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
Whole-brain axonal projection mapping revealed that DR serotonin neurons co-expressing vesicular glutamate transporter-3 preferentially innervate the cortex, whereas those co-expressing thyrotropin-releasing hormone innervate subcortical regions in particular the hypothalamus.
Usefulness & Problems
Why this is useful
This method maps axonal projections of serotonin neuron subpopulations across the brain. In this paper it linked VGLUT3-coexpressing neurons to cortical innervation and TRH-coexpressing neurons to subcortical, especially hypothalamic, innervation.; mapping projection targets of serotonin neuron subpopulations across the brain
Source:
This method maps axonal projections of serotonin neuron subpopulations across the brain. In this paper it linked VGLUT3-coexpressing neurons to cortical innervation and TRH-coexpressing neurons to subcortical, especially hypothalamic, innervation.
Source:
mapping projection targets of serotonin neuron subpopulations across the brain
Problem solved
It solves the problem of relating molecular subtype identity to long-range anatomical output patterns.; connects molecularly defined serotonin neuron subpopulations to brain-wide projection patterns
Source:
It solves the problem of relating molecular subtype identity to long-range anatomical output patterns.
Source:
connects molecularly defined serotonin neuron subpopulations to brain-wide projection patterns
Problem links
connects molecularly defined serotonin neuron subpopulations to brain-wide projection patterns
LiteratureIt solves the problem of relating molecular subtype identity to long-range anatomical output patterns.
Source:
It solves the problem of relating molecular subtype identity to long-range anatomical output patterns.
Published Workflows
Objective: To define the molecular heterogeneity of serotonin neurons in the mouse dorsal and median raphe nuclei and relate molecularly defined subpopulations to anatomical location and whole-brain projection patterns.
Why it works: The workflow combines transcriptomic clustering to define candidate subtypes, in situ hybridization to localize them anatomically, and projection mapping plus single-cell reconstruction to connect subtype identity with output anatomy.
co-expression-defined serotonin neuron subtype organizationassociation of VGLUT3 co-expression with cortical innervationassociation of TRH co-expression with subcortical and hypothalamic innervationplate-based single-cell RNA-sequencingsystematic in situ hybridizationintersectional viral-genetic targetingwhole-brain axonal projection mappingsingle-cell reconstruction
Stages
- 1.Single-cell transcriptomic profiling(broad_screen)
This stage defines transcriptomically distinct serotonin neuron clusters as the basis for downstream spatial and projection analyses.
Selection: transcriptome-wide single-cell expression profiles of serotonin neurons
- 2.Spatial mapping by in situ hybridization(secondary_characterization)
This stage links transcriptomic clusters to principal DR, caudal DR, or MR anatomy.
Selection: mapping specific transcriptomic clusters to raphe subregions
- 3.Generation of intersectional access tools(functional_characterization)
This stage provides selective access to specific serotonin neuron subpopulations for downstream anatomical analysis.
Selection: ability to access specific subpopulations
- 4.Whole-brain projection mapping and single-cell reconstruction(confirmatory_validation)
This stage tests whether molecularly defined or marker-defined serotonin neuron populations have distinct projection targets.
Selection: brain-wide axonal projection patterns of defined serotonin neuron subpopulations and individual neurons
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 whole-brain anatomical projection mapping workflow and access to the targeted neuron populations.; requires whole-brain projection mapping workflow
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
Plate-based single-cell RNA-sequencing identified eleven transcriptomically distinct serotonin neuron clusters in the mouse dorsal and median raphe nuclei.
cluster count 11
Whole-brain axonal projection mapping showed that dorsal raphe serotonin neurons co-expressing vesicular glutamate transporter-3 preferentially innervate the cortex, whereas those co-expressing thyrotropin-releasing hormone innervate subcortical regions, particularly the hypothalamus.
Reconstruction of 50 individual dorsal raphe serotonin neurons revealed diverse and segregated axonal projection patterns at the single-cell level.
reconstructed neuron count 50
Systematic in situ hybridization mapped specific serotonin neuron transcriptomic clusters to the principal dorsal raphe, caudal dorsal raphe, or median raphe.
The study generated novel intersectional viral-genetic tools to access specific serotonin neuron subpopulations.
Approval Evidence
1 source2 linked approval claimsfirst-pass slug whole-brain-axonal-projection-mapping
Whole-brain axonal projection mapping revealed that DR serotonin neurons co-expressing vesicular glutamate transporter-3 preferentially innervate the cortex, whereas those co-expressing thyrotropin-releasing hormone innervate subcortical regions in particular the hypothalamus.
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projection mappingsupports
Whole-brain axonal projection mapping showed that dorsal raphe serotonin neurons co-expressing vesicular glutamate transporter-3 preferentially innervate the cortex, whereas those co-expressing thyrotropin-releasing hormone innervate subcortical regions, particularly the hypothalamus.
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single cell reconstruction resultsupports
Reconstruction of 50 individual dorsal raphe serotonin neurons revealed diverse and segregated axonal projection patterns at the single-cell level.
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Comparisons
Source-backed strengths
revealed differential cortical versus subcortical innervation patterns
Source:
revealed differential cortical versus subcortical innervation patterns
Compared with Langendorff perfused heart electrical recordings
whole-brain axonal projection mapping 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
whole-brain axonal projection mapping 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.
whole-brain axonal projection mapping 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.