Rapid Dissection and Dissociation of the Mouse Olfactory Epithelium for Single-Nucleus Suspensions
August 1st, 2025
This article provides a streamlined protocol for the dissection and dissociation of murine olfactory epithelium for the purpose of single-nucleus RNA sequencing.
Here we provide a protocol designed to assist with the rapid dissection of the olfactory epithelium for the purpose of single-cell or single-nucleus sequencing. Our protocol prioritizes speed and ease of learning, and it's ideal for single-cell applications where the tissue is homogenized and fast dissection is more important than preserving anatomic integrity, unlike previous methods. Our protocol enables rapid, user-friendly dissection of the olfactory epithelium, aiming to facilitate single-cell sequencing studies and promote research into the genetic basis of the olfactory system.
To begin, obtain the de-skinned head of a mouse. Use a pair of fine, sharp-tipped scissors to make two incisions to break the zygomatic arches from the squamosal bone bilaterally by placing one scissor tip in the posterior orbit and the other adjacent to the auditory canal. Make a shallow incision from orbit to orbit along the most anterior aspect of the frontal bone, incising only the dorsal surface of the frontal bone to a depth of approximately one to two millimeters.
Now, cut along the midline of the skull from the foramen magnum through the sagittal and interfrontal sutures until reaching the interorbital incision made earlier. Insert a pair of forceps into the midline incision and firmly pull one hemisphere of the cranial vault laterally. While holding the nasal bone and incisor teeth, use forceps to break away the contralateral cranial vault.
Allow the brain, including the olfactory bulbs, to be removed with the hemisphere of bone as it is torn away. Next, use bone nippers or Rongeurs to remove any remaining frontal bone and premaxillary bone up to the base of the incisor teeth. Cut along the frontonasal suture with bone nippers to release the nasal bone from the cribriform plate.
Then use forceps to lift the nasal bone off the cribriform plate to expose the olfactory epithelium. If residual premaxillary bone obstructs the dorsal olfactory epithelium, remove it before proceeding. Now, use a pair of fine-tipped forceps to gently secure the dorsal aspect of the nasal septum at its junction with the cribriform plate, and pull it posteriorly.
The main olfactory epithelium will break free as a wholly intact structure. Imaging flow cytometry identified that 53.69%of all events were nuclei. Among the single nuclei, 53.89%had high circularity.
Quality control plots confirmed consistent sequencing quality across four samples, with uniform gene and mitochondrial count distributions. The dataset's marker genes are consistent with many of the well-established marker genes for each cell type.
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Overview
This article outlines a protocol for the rapid dissection and dissociation of murine olfactory epithelium aimed at facilitating single-nucleus RNA sequencing. The method prioritizes speed and ease of execution, making it suitable for applications where tissue homogenization is necessary.
Key Study Components
Area of Science
- Neuroscience
- Genomics
- Olfactory System Research
Background
- Single-cell and single-nucleus RNA sequencing are crucial for understanding cellular diversity.
- Previous dissection methods emphasized anatomical integrity, which may not be ideal for certain applications.
- The olfactory epithelium plays a fundamental role in olfactory sensory transduction.
- Enhancing dissection techniques can improve the efficiency of genetic studies related to olfaction.
Purpose of Study
- To provide a user-friendly protocol for olfactory epithelium dissection.
- To facilitate rapid tissue processing for single-cell sequencing investigations.
- To promote research on the genetic mechanisms of the olfactory system.
Methods Used
- The method employs dissection of olfactory epithelium from murine models.
- This biological model involves the mouse olfactory system, emphasizing the need for rapid extraction.
- Bone removal and careful manipulation ensure integrity of the main olfactory epithelium.
- Key steps include incisions in the cranial vault and extraction of the olfactory structures.
- Quality controls were implemented to maintain consistent sequencing quality.
Main Results
- Over half of collected events were identified as nuclei, indicating successful isolation.
- High circularity of nuclei suggests quality preservation during dissection.
- Quality control demonstrated uniform gene and mitochondrial distributions.
- Marker genes aligned with established benchmarks for cell types.
Conclusions
- The study presents a rapid methodological advancement for dissecting the olfactory epithelium.
- By enabling efficient single-nucleus sequencing, it contributes to understanding genetic factors in olfaction.
- This protocol could enhance the analysis of neuronal mechanisms and plasticity in sensory systems.
Frequently Asked Questions
Executive Industry Relevance
Rapid and reproducible preparation of single-nucleus suspensions from the mouse olfactory epithelium enables high-resolution molecular profiling of diverse neuronal and progenitor populations. This protocol addresses a key bottleneck in single-cell genomics by minimizing tissue extraction time and preserving nuclear integrity, supporting robust target validation and mechanistic de-risking in sensory neuroscience pipelines. The approach enhances predictive confidence for early discovery and translational research focused on the genetic basis of olfactory function and regeneration.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables rapid hypothesis testing of gene expression in olfactory sensory neurons and progenitors.
- Supports functional target validation by preserving nuclear quality for downstream sequencing.
- Facilitates mechanistic de-risking of candidate pathways involved in sensory neuron turnover.
- Improves predictive confidence for prioritizing targets in sensory system research.
Screening & Assay Development
- Provides high-quality single-nucleus suspensions suitable for standardized single-cell sequencing workflows.
- Ensures reproducibility and scalability across multiple samples and experimental runs.
- Delivers quantitative outputs, including nuclear yield and quality metrics, for assay benchmarking.
- Enables reliable evaluation of gene expression changes in response to experimental perturbations.
Translational & Preclinical Research
- Aligns with disease-relevant models for studying olfactory dysfunction and regeneration.
- Supports continuity from discovery-stage genomics to preclinical validation of molecular targets.
- Reduces biological risk by providing consistent, high-quality data for translational biomarker identification.
- Facilitates risk-adjusted advancement decisions in sensory neuroscience portfolios.
Pipeline & Workflow Integration
This protocol integrates at the interface of early discovery and lead identification, enabling seamless transition from tissue extraction to single-nucleus sequencing and downstream analytics.
- Discovery Biology: Accelerates hypothesis testing and pathway clarification in olfactory system research.
- Screening: Delivers assay-ready nuclear suspensions with validated quality metrics.
- Analytics: Provides quantitative readouts for comparing gene expression across cell types and conditions.
- Translational Research: Supports biomarker alignment and preclinical model development for olfactory disorders.
- Enterprise Reuse: Establishes a standardized, reusable workflow for single-nucleus preparation in sensory tissues.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence and reduces mechanistic ambiguity in target validation.
- Operational Value: Enhances standardization, reproducibility, and throughput for single-cell genomics.
- Strategic Value: Enables informed go/no-go decisions and capital-efficient portfolio management.
- Portfolio Impact: Supports risk-adjusted prioritization and advancement of sensory neuroscience programs.
Implementation Considerations
- Requires technical expertise in rapid dissection and nuclear isolation from complex anatomical structures.
- Demands access to specialized instrumentation for tissue processing and quality control (e.g., imaging flow cytometry).
- Necessitates cross-team standardization to ensure reproducibility across studies and operators.
- May require adaptation for use with other tissue types or model systems with distinct anatomical features.
- Speed-focused extraction may limit applications where anatomical integrity is critical.
