Source 1primary paper2013Proceedings of the National Academy of Sciences
Toolkit/pulse-chase (15)N labeling
pulse-chase (15)N labeling
Taxonomy: Technique Branch / Method. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
Lifetimes of PNN vs. intrasynaptic components would be compared with pulse-chase (15)N labeling in mice
Usefulness & Problems
Why this is useful
Pulse-chase 15N labeling is proposed to compare the lifetimes of PNN components versus intrasynaptic components in mice.; comparing lifetimes of PNN and intrasynaptic components in mice
Source:
Pulse-chase 15N labeling is proposed to compare the lifetimes of PNN components versus intrasynaptic components in mice.
Source:
comparing lifetimes of PNN and intrasynaptic components in mice
Problem solved
It addresses whether PNN components persist differently from synaptic components, a key part of the storage hypothesis.; proposed measurement of relative component turnover
Source:
It addresses whether PNN components persist differently from synaptic components, a key part of the storage hypothesis.
Source:
proposed measurement of relative component turnover
Problem links
proposed measurement of relative component turnover
LiteratureIt addresses whether PNN components persist differently from synaptic components, a key part of the storage hypothesis.
Source:
It addresses whether PNN components persist differently from synaptic components, a key part of the storage hypothesis.
Published Workflows
Objective: Test the hypothesis that very long-term memories are stored as the pattern of holes in the perineuronal net by combining structural imaging, component lifetime measurements, in vivo monitoring of PNN-eroding proteases, perturbation approaches, and activity-linked functional manipulation.
Why it works: The proposed workflow combines complementary measurements: structural imaging to visualize PNN-synapse geometry, isotope-based approaches to compare component lifetimes, in vivo reporters to resolve protease activity, and perturbation plus behavioral comparison to test functional importance.
very long-term memories stored in the pattern of holes in the perineuronal netprotease-mediated local erosion of PNNrelationship between PNN structure and synapse formationserial-section EMpulse-chase 15N labeling14C content analysis in human cadaver brainsgenetically encoded indicatorsantineoepitope antibodiesgenetic knockoutspharmacological inhibitorsgenetically encoded snapshot reporterimaging of biosynthesis of PNN components and proteases
Stages
- 1.Structural imaging of PNN-synapse architecture(functional_characterization)
To directly visualize the structural arrangement proposed to encode very long-term memory.
Selection: Image the 3D intertwining of PNN and synapses
- 2.Component lifetime comparison(secondary_characterization)
To test whether PNN components have lifetimes consistent with a substrate for very long-term memory.
Selection: Compare lifetimes of PNN versus intrasynaptic components
- 3.In vivo protease activity resolution(functional_characterization)
To better resolve when and where proteases locally erode PNN in vivo.
Selection: Improve spatial and temporal resolution of in vivo activity of proteases that locally erode PNN
- 4.Perturbation and functional testing of PNN erosion(confirmatory_validation)
To causally test whether manipulating PNN erosion and the implicated neuronal ensembles changes behavior.
Selection: Use genetic, pharmacological, and activity-linked perturbation tools to test functional importance and behavioral consequences
- 5.Imaging biosynthesis of PNN components and proteases(secondary_characterization)
To observe production of PNN components and proteases relevant to net maintenance and remodeling.
Selection: Image biosynthesis of PNN components and proteases
Taxonomy & Function
Primary hierarchy
Technique Branch
Method: A concrete measurement method used to characterize an engineered system.
Mechanisms
isotopic pulse-chase labelingTechniques
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 explicitly places this approach in mice.; requires mouse experiments
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
14C content in human cadaver brains is proposed to compare lifetimes of PNN and intrasynaptic components.
and (14)C content in human cadaver brains
Genetically encoded indicators and antineoepitope antibodies should improve spatial and temporal resolution of in vivo activity of proteases that locally erode PNN.
Genetically encoded indicators and antineoepitope antibodies should improve spatial and temporal resolution of the in vivo activity of proteases that locally erode PNN.
Pulse-chase 15N labeling in mice is proposed to compare lifetimes of PNN and intrasynaptic components.
Lifetimes of PNN vs. intrasynaptic components would be compared with pulse-chase (15)N labeling in mice
Serial-section EM is proposed to image the 3D intertwining of perineuronal net and synapses.
The 3D intertwining of PNN and synapses would be imaged by serial-section EM.
A genetically encoded snapshot reporter is proposed to capture neuronal activity patterns at an illumination-defined time, mark those cells by driving effector gene expression, and enable selective excitation, inhibition, or ablation to test functional importance.
a genetically encoded snapshot reporter, which will capture the pattern of activity throughout a large ensemble of neurons at a time precisely defined by the triggering illumination, drive expression of effector genes to mark those cells, and allow selective excitation, inhibition, or ablation to test their functional importance
The genetically encoded snapshot reporter should enable more precise inhibition or potentiation of PNN erosion to compare with behavioral consequences.
The snapshot reporter should enable more precise inhibition or potentiation of PNN erosion to compare with behavioral consequences.
Approval Evidence
1 source1 linked approval claimfirst-pass slug pulse-chase-15-n-labeling
Lifetimes of PNN vs. intrasynaptic components would be compared with pulse-chase (15)N labeling in mice
Source:
proposed method capabilitysupports
Pulse-chase 15N labeling in mice is proposed to compare lifetimes of PNN and intrasynaptic components.
Lifetimes of PNN vs. intrasynaptic components would be compared with pulse-chase (15)N labeling in mice
Source:
Comparisons
Source-backed strengths
supports lifetime comparison of extracellular and synaptic components
Source:
supports lifetime comparison of extracellular and synaptic components
Compared with Langendorff perfused heart electrical recordings
pulse-chase (15)N labeling 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
pulse-chase (15)N labeling 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.
pulse-chase (15)N labeling 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.