Source 1primary paper2019eLife
Toolkit/systematic in situ hybridization
systematic in situ hybridization
Also known as: in situ hybridization, ISH
Taxonomy: Technique Branch / Method. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
Systematic in situ hybridization mapped specific clusters to the principal DR, caudal DR, or MR.
Usefulness & Problems
Why this is useful
ISH was used to examine how the tested pathway affects Smad4 expression in tendinopathic tenocytes and tendons. It contributed mechanistic evidence for the proposed anti-apoptotic axis.; examining pathway effects on Smad4 expression in tendinopathic tenocytes and tendons; This method spatially maps transcriptomically defined serotonin neuron clusters within raphe subregions. In the abstract it assigns clusters to principal DR, caudal DR, or MR.; mapping transcriptomic clusters to anatomical raphe subregions
Source:
ISH was used to examine how the tested pathway affects Smad4 expression in tendinopathic tenocytes and tendons. It contributed mechanistic evidence for the proposed anti-apoptotic axis.
Source:
examining pathway effects on Smad4 expression in tendinopathic tenocytes and tendons
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This method spatially maps transcriptomically defined serotonin neuron clusters within raphe subregions. In the abstract it assigns clusters to principal DR, caudal DR, or MR.
Source:
mapping transcriptomic clusters to anatomical raphe subregions
Problem solved
It helps connect pathway perturbation to downstream Smad4 expression changes.; provides expression-level evidence for the proposed downstream Smad4 mechanism; It solves the problem of connecting single-cell transcriptomic clusters to anatomical location.; links molecularly defined clusters to spatial locations
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It helps connect pathway perturbation to downstream Smad4 expression changes.
Source:
provides expression-level evidence for the proposed downstream Smad4 mechanism
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It solves the problem of connecting single-cell transcriptomic clusters to anatomical location.
Source:
links molecularly defined clusters to spatial locations
Problem links
links molecularly defined clusters to spatial locations
LiteratureIt solves the problem of connecting single-cell transcriptomic clusters to anatomical location.
Source:
It solves the problem of connecting single-cell transcriptomic clusters to anatomical location.
provides expression-level evidence for the proposed downstream Smad4 mechanism
LiteratureIt helps connect pathway perturbation to downstream Smad4 expression changes.
Source:
It helps connect pathway perturbation to downstream Smad4 expression changes.
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
The abstract supports a need for tendinopathic tenocyte and tendon samples plus ISH reagents for Smad4 analysis. No protocol details are given.; requires samples and ISH reagents suitable for Smad4 expression analysis; It requires in situ hybridization assays using informative marker genes and anatomical tissue context.; requires marker-based spatial hybridization measurements
The abstract does not show that ISH by itself proves direct targeting or fully quantifies pathway dynamics.; abstract does not specify probe design, quantification, or whether ISH alone was sufficient to assign causality
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
2 sources1 linked approval claimfirst-pass slugs in-situ-hybridization, systematic-in-situ-hybridization
In situ hybridization (ISH) and immunohistochemistry (IHC) were performed to examine the pathway's effect on Smad4 expression in tendinopathic tenocytes and tendons.
Source:
Systematic in situ hybridization mapped specific clusters to the principal DR, caudal DR, or MR.
Source:
spatial mappingsupports
Systematic in situ hybridization mapped specific serotonin neuron transcriptomic clusters to the principal dorsal raphe, caudal dorsal raphe, or median raphe.
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Comparisons
Source-stated alternatives
IHC was used alongside ISH in the same study to examine Smad4 expression.
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IHC was used alongside ISH in the same study to examine Smad4 expression.
Source-backed strengths
used as a mechanistic readout in both cells and tendons; mapped specific clusters to principal DR, caudal DR, or MR
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used as a mechanistic readout in both cells and tendons
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mapped specific clusters to principal DR, caudal DR, or MR
Compared with Langendorff perfused heart electrical recordings
systematic in situ hybridization and Langendorff perfused heart electrical recordings address a similar problem space.
Shared frame: same top-level item type
Strengths here: appears more independently replicated; looks easier to implement in practice.
Compared with native green gel system
systematic in situ hybridization and native green gel system address a similar problem space.
Shared frame: same top-level item type
Strengths here: appears more independently replicated; looks easier to implement in practice.
systematic in situ hybridization and sub-picosecond pump-probe analysis of bacteriorhodopsin pigments address a similar problem space.
Shared frame: same top-level item type
Strengths here: appears more independently replicated; looks easier to implement in practice.
Ranked Citations
- 1.