Embryo Fixation Protocol
Embryo Fixation Protocol - Related Videos
10:21
Protocol for HER2 FISH Using a Non-cross-linking, Formalin-free Tissue Fixative to Combine Advantages of Cryo-preservation and Formalin Fixation
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Cited by 3 •
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Fluorescence in-situ hybridization (FISH) is often required in combination with histopathology and molecular diagnostics for selection of therapy in personalized medicine. A novel non-cross-linking, formalin-free tissue fixative that allows high quality morphologic, molecular and FISH analyses from the same specimen by addition of a post-fixation step before FISH is presented.
10:57
Chicken Embryo Spinal Cord Slice Culture Protocol
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Slice cultures facilitate the manipulation of embryo development by gene and pharmacological perturbations. However, culture conditions must ensure that normal development can proceed within the reduced environment of the slice. We illustrate a protocol that facilitates normal spinal cord development to proceed for at least 24 hr.
08:57
The Preparation of Drosophila Embryos for Live-Imaging Using the Hanging Drop Protocol
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Cited by 34 •
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A simple, inexpensive, and effective method of preparing Drosophila embryos for live-imaging analysis is presented. Our protocol provides humidity and gas exchange and does not compress the Drosophila embryo. This method is suitable for GFP-based live imaging of Drosophila embryos using a stereomicroscope or upright compound microscope.
07:32
Protocols for Obtaining Zygotic and Somatic Embryos for Studying the Regulation of Early Embryo Development in the Model Legume Medicago truncatula
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Cited by 2 •
2015
The goal is to illustrate that the model legume Medicago truncatula can be readily utilized to investigate the regulation of early plant embryogenesis to complement the non-legume Arabidopsis model. Pod morphology is linked to zygotic embryogenesis stages and a protocol to collect embryos using tissue culture is also provided.
08:53
Whole Animal Perfusion Fixation for Rodents
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Cited by 531 •
2012
Here we describe a low-cost, rapid, controlled and uniform fixation procedure using 4% paraformaldehyde perfused via the vascular system: through the heart of the rat to obtain the best possible preservation of the brain.
FAQs
The fixative stabilizes or cross-links cellular components, which helps maintain relationships among cells and preserves developmental morphology. At the same time, fixation halts degradation that could otherwise alter the specimen after collection. Preserving these spatial features allows later observations to reflect the embryo’s organization at the time it was fixed rather than changes occurring during handling.
Fixation must preserve tissue morphology without making the specimen inaccessible to later probes or dyes. Excessive or poorly controlled reagent exposure can interfere with access, whereas insufficient stabilization may compromise spatial information and cellular structure. Managing exposure and handling therefore supports both reliable morphological preservation and successful downstream staining, labeling, or imaging.
Reagent exposure and handling directly influence how well an embryo retains its cellular and developmental features. Careful control helps limit structural changes while maintaining the spatial information needed for analysis. Consistent treatment also makes specimens more comparable, which is important when researchers examine differences between normal development and experimental or disease-related conditions.
Reproducible fixation produces specimens with more consistent preservation of morphology and cellular organization. This consistency strengthens comparisons across embryos, experimental groups, and developmental conditions. It is especially valuable when fixed samples support gene-expression analysis, immunostaining, or high-resolution imaging, because observed differences should reflect biology rather than uncontrolled variation introduced during preservation.
After collection, the embryo is exposed to a chemical fixative under controlled handling conditions. The preserved sample then undergoes washing before downstream staining, probe-based analysis, or microscopy. This sequence prepares the specimen for examination while retaining structural and spatial information. The protocol therefore connects initial preservation with later visualization and biological interpretation.
Researchers should control fixative exposure and handle embryos carefully throughout preservation, washing, staining, and imaging preparation. These conditions affect whether cellular organization remains intact and whether probes or dyes can access the sample. Attention to each stage helps produce specimens suitable for reproducible microscopy and reduces the risk that processing will obscure developmental features.
Fixed embryos support several complementary investigations, including developmental morphology, gene-expression analysis, immunostaining, and high-resolution imaging. They can also provide reproducible specimens for comparing normal development with experimental or disease-related changes. Because preservation retains spatial relationships, researchers can examine where cellular or developmental features occur within the embryo rather than relying only on isolated measurements.