Double In Utero Electroporation to Target Temporally and Spatially Separated Cell Populations
June 14th, 2020
7.2K views
Double in utero electroporation allows targeting cell populations that are spatially and temporally separated. This technique is useful to visualize interactions between those cell populations using fluorescent proteins in normal conditions but also after functional experiments to perturb genes of interest.
Overview
This study explores double in utero electroporation as a technique to examine mammalian corticogenesis, specifically the interactions between neurons generated in different locations and at various developmental stages. This method allows for the visualization of cell interactions and the assessment of gene perturbations in both normal conditions and in models of neuronal disorders.
Key Study Components
Area of Science
- Neuroscience
- Developmental Biology
- Corticogenesis
Background
- Double in utero electroporation targets spatially and temporally separated cell populations.
- The technique assists in visualizing interactions through fluorescent proteins.
- It is applicable beyond the neocortex to areas like the sepalium and cerebellum.
- Allows examination of unperturbed neuron interactions, crucial for understanding disorders like autism and schizophrenia.
Purpose of Study
- To enhance the understanding of neuron interactions during corticogenesis.
- To explore the implications for understanding wiring alterations in neuronal disorders.
- To establish methods for gene perturbation and visualization in developing brains.
Methods Used
- Double in utero electroporation, utilizing DNA injections into embryonic ventricles.
- Early embryonic mice were used as the biological model, focusing on different developmental stages (E11.5, E13.5, E15.5).
- Included surgical procedures for electroporation and successful recovery monitoring.
- Specific timelines for embryo handling and gene visualization techniques were detailed.
- Efficacy assessed using fluorescent imaging post-harvest and fixation.
Main Results
- The methodology successfully allowed for targeting and visualizing interactions between neuron populations from varied embryonic time points.
- Resulted in effective gene perturbation assessments and highlighted the technique's broad applicability.
- Concluded that this approach aids in delineating neuronal wiring changes in relation to disorders.
Conclusions
- This study demonstrates the utility of double in utero electroporation in understanding mammalian brain development.
- It enables insights into the mechanisms governing neuron interactions and implications for neurodevelopmental disorders.
- The findings support further research into neuronal plasticity and potential therapeutic avenues for disorders like autism and schizophrenia.
Frequently Asked Questions
What are the advantages of double in utero electroporation?
This technique allows precise targeting of distinct neuron populations based on their spatial and temporal characteristics, enabling detailed analysis of their interactions.
How is the biological model implemented?
Embryonic mice at various stages (E11.5, E13.5, E15.5) are injected with DNA solutions into their lateral ventricles for electroporation.
What outcomes are obtained from this method?
The method yields data on cell interactions and gene perturbations, visualized through fluorescence imaging techniques post-surgery.
Can this technique be adapted for different areas of the brain?
Yes, the technique can be employed in various brain regions, including both neocortical and extra-cortical areas like the sepalium or cerebellum.
What are the key limitations of this method?
Challenges include precision in DNA injection and ensuring the embryos' health and recovery post-surgery, which must be closely monitored.
How does this study contribute to understanding neuronal disorders?
It facilitates better insight into how neuronal wiring alterations occur in conditions such as autism and schizophrenia, potentially guiding future therapeutic strategies.
Executive Industry Relevance
Double in utero electroporation enables precise genetic manipulation and visualization of spatially and temporally distinct neural cell populations during mammalian brain development. This capability supports mechanistic de-risking and target validation in neurodevelopmental research, particularly for modeling cell-cell interactions relevant to neuropsychiatric disorders. The approach reduces the need for new transgenic lines, accelerating early discovery and portfolio triage in CNS drug development.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables interrogation of developmental hypotheses by targeting distinct neural progenitor populations at defined embryonic stages.
- Facilitates functional validation of gene perturbations in specific cell types, supporting mechanistic de-risking.
- Allows visualization of cell migration and interaction, informing target confidence for neurodevelopmental pathways.
Screening & Assay Development
- Prepares validated in vivo systems for downstream phenotypic screening of genetic or pharmacological interventions.
- Supports reproducible labeling and manipulation of neural subtypes, enhancing assay standardization.
- Generates quantitative imaging outputs for comparative analysis of cell behaviors and interactions.
Translational & Preclinical Research
- Aligns with disease-relevant models for studying neuronal wiring alterations implicated in disorders such as autism and schizophrenia.
- Provides continuity from discovery-stage genetic manipulation to preclinical phenotypic assessment.
- Enables risk-adjusted advancement of CNS targets based on in vivo mechanistic evidence.
Pipeline & Workflow Integration
This method integrates into the discovery-to-preclinical continuum by enabling hypothesis-driven manipulation and visualization of neural circuits in vivo.
- Discovery Biology: Supports hypothesis testing on cell lineage, migration, and interaction during corticogenesis.
- Screening: Delivers reproducible, quantitative imaging outputs for evaluating genetic or compound effects on neural populations.
- Analytics: Provides high-resolution data on spatial and temporal cell dynamics for statistical comparison across conditions.
- Translational Research: Bridges early mechanistic findings to disease-relevant phenotypes in neurodevelopmental models.
- Enterprise Reuse: Offers a flexible, reusable platform for targeting diverse neural populations without generating new mouse lines.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence in CNS target validation and reduces mechanistic ambiguity.
- Operational Value: Streamlines workflows by minimizing the need for new transgenic models and enabling rapid experimental iteration.
- Strategic Value: Improves go/no-go decisions for neurodevelopmental targets, enhancing capital efficiency.
- Portfolio Impact: Supports risk-adjusted prioritization of CNS programs based on robust in vivo evidence.
Implementation Considerations
- Requires expertise in embryonic surgery, in utero electroporation, and advanced imaging techniques.
- Demands access to precise microinjection and electroporation instrumentation, as well as confocal microscopy.
- Necessitates cross-team standardization of timing, injection sites, and electrode placement for reproducibility.
- Adaptation across brain regions and developmental stages must be empirically validated for each application.
- Technical challenges include ensuring embryo viability and accurate targeting of desired cell populations.
Biopharma FAQs
Why does null hypothesis testing matter for double electroporation target validation?
Null hypothesis testing enables objective assessment of whether observed cell interactions or gene perturbation effects are statistically significant, supporting robust target validation in neural development studies.
How does independent variable isolation fit the double electroporation discovery pipeline?
By temporally and spatially separating DNA delivery, researchers can isolate the effects of gene manipulation in distinct neural populations, clarifying causal relationships in developmental pathways.
What do quantitative dependent variable measurements enable in this protocol?
Quantitative imaging of labeled cells allows for precise measurement of migration, interaction, and projection patterns, enabling comparative analysis across experimental conditions.
Why are replication requirements critical for cross-functional collaboration in double electroporation studies?
Replication ensures that observed neural phenotypes and interactions are reproducible, facilitating data sharing and integration across discovery, screening, and translational teams.
What statistical analysis capabilities are required before implementing double in utero electroporation outputs?
Teams must be equipped to perform statistical comparisons of imaging data, including cell counts and interaction frequencies, to validate findings and inform portfolio decisions.
Chapters in this video
0:04
Introduction
1:09
First In Utero Electroporation Surgery
3:20
Second In Utero Electroporation
4:18
Tissue Harvesting and Sectioning: Strategy A
6:09
Tissue Harvesting and Sectioning: Strategy B
7:24
Confocal Fluorescence Imaging and Analysis
8:34
Results: Representative Double Electroporation-Facilitated Cell Interaction Visualization Strategies
9:55
Conclusion
