Embryo Fixation
Embryo Fixation - Related Videos
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.
01:03
Fixation and Sectioning
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2023
Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens. The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
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 •
2017
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.
11:14
Assay for Neural Induction in the Chick Embryo
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Cited by 1 •
2009
Neural induction is the first step in the formation of the brain. It is a mechanism by which Hensen's node (organizer), instructs adjacent tissue to adopt a neural fate, i.e. to give rise to the nervous system. This video demonstrates an assay for neural induction in chick embryo.
09:08
Visualization of the Embryonic Nervous System in Whole-mount Drosophila Embryos
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Cited by 5 •
2010
We describe the procedure to prepare staged Drosophila embryos for the visualization of the embryonic nervous system during embryogenesis.
FAQs
Chemical fixatives preserve embryo samples through two main actions: crosslinking proteins or precipitating them. Crosslinking creates molecular links that stabilize cellular structures, whereas precipitation immobilizes proteins by making them less soluble. Both actions slow enzymatic breakdown and help retain the original arrangement of cells and tissues, which is essential when microscopy is used to interpret developmental organization.
Time and other fixation conditions must be controlled because preservation quality and detection quality are linked. The treatment needs to stabilize the embryo’s cells and molecular components, yet excessive fixation can reduce access for antibodies or probes and alter detectable signals. Optimizing these conditions is therefore especially important when structural preservation and molecular localization are assessed together.
Over-fixation can make preserved molecular targets less accessible to detection reagents. In practical terms, antibodies used for immunostaining or probes used for in situ hybridization may have more difficulty reaching their targets, and the measured signal may be altered. Thus, a sample can retain overall structure while giving a less reliable representation of molecular localization.
A typical workflow begins by treating the embryo with a chemical fixative, followed by examination with microscopy or preparation for staining. The preserved sample can then undergo immunostaining, in situ hybridization, or fluorescence imaging, depending on whether the goal is to visualize proteins, gene-related signals, or broader structural patterns. The chosen downstream method determines what information fixation must retain.
Embryo fixation supports several complementary readouts rather than a single type of observation. Microscopy can reveal cell division, tissue patterning, and anatomical defects, while immunostaining and fluorescence imaging help show where proteins or other labeled signals occur. In situ hybridization is useful for examining gene localization. Together, these approaches connect embryo structure with molecular distribution.
In developmental biology, fixed embryos provide a stable snapshot for comparing organization after growth has stopped. Researchers can assess whether cells occupy expected positions, whether tissues form recognizable patterns, and whether anatomical defects are present. Because fixation preserves spatial relationships, the resulting images can relate developmental morphology to gene or protein localization within the same specimen.