Subcellular Markers
Subcellular Markers - Related Videos
11:19
Imaging Subcellular Structures in the Living Zebrafish Embryo
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Cited by 8 •
2016
Imaging the dynamic behavior of organelles and other subcellular structures in vivo can shed light on their function in physiological and disease conditions. Here, we present methods for genetically tagging two organelles, centrosomes and mitochondria, and imaging their dynamics in living zebrafish embryos using wide-field and confocal microscopy.
01:32
Subcellular Fractionation
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2023
The homogenate obtained after cell lysis contains various membrane-bound organelles that can be further separated into pure fractions by subcellular fractionation. These isolates are used to study specific cellular components, analyze localized protein activity, and are even employed in diagnostics. Fractionation is typically achieved using centrifugation methods, the most common being density-gradient and differential centrifugation. Differential Centrifugation Differential centrifugation is...
04:10
Measuring Proteasome Activity in Different Subcellular Compartments of the Rat Brain
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2025
This video demonstrates how to measure proteasome activity in different subcellular compartments of the lateral amygdala from fear-conditioned and control rat brains using a fluorogenic peptide assay. The proteasome cleaves the fluorogenic peptide substrate, releasing fluorescent molecules, which are quantified using a plate reader to assess proteasome activity in the nuclear and synaptic protein fractions. Increased nuclear activity suggests changes in gene expression, while reduced synaptic...
09:20
In situ Subcellular Fractionation of Adherent and Non-adherent Mammalian Cells
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Cited by 29 •
2010
In situ subcellular fractionation of mammalian cells on microscope coverslips allows the visualisation of protein localisation.
05:04
An Immunolabeling Technique to Visualize the Subcellular Localization of Proteins
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2025
This video demonstrates a technique for the immunolabeling of sigma-1 receptors in a murine heart tissue section using quantum dots. The heart tissue is fixed, osmicated, stained, dehydrated, embedded in resin, and then sectioned. The sections are then treated with antibodies and labeled with quantum dots to demarcate the subcellular localization of Sigma-1 receptors using electron microscopy.
FAQs
The signal-generating strategy determines how a cellular target becomes visible. Fluorescent dyes provide a detectable optical signal, antibody-based probes rely on selective binding, and genetically encoded reporter proteins produce signals associated with cellular expression. Choosing among these approaches helps align the marker with the target, the desired readout, and the need to distinguish specific localization patterns.
Controls help determine whether an observed signal reflects the intended target rather than nonspecific labeling or an unrelated cellular structure. This distinction is especially important when markers are used to assign proteins or nucleic acids to particular compartments. Appropriate controls therefore strengthen confidence that a detected pattern represents genuine subcellular localization and not a misleading experimental signal.
These marker classes differ in how they connect a target to a detectable signal. Fluorescent dyes contribute optical visibility, antibody-based probes use selective molecular recognition, and genetically encoded reporter proteins generate a signal through an encoded cellular component. Their different designs give researchers alternative ways to examine organelles, proteins, nucleic acids, or other structures within cells.
Reliability depends on selecting a marker that matches the cellular target and on using conditions and controls that support signal specificity. Researchers must also consider whether microscopy or biochemical analysis is the appropriate readout for the question. Careful alignment among target, marker, detection method, and controls improves interpretation of cellular organization and protein distribution.
A typical workflow begins by identifying the organelle, protein, nucleic acid, or other structure of interest. Researchers then select a compatible molecular label, apply the marker, and examine the resulting signal through microscopy or biochemical analysis. Comparing the detection pattern with appropriate controls allows localization or compartmental organization to be interpreted more accurately.
They are useful when researchers need to map where cellular components occur and how their positions relate to intracellular compartments. Marker-based localization can reveal protein distribution, support analysis of trafficking patterns, and help characterize organelle organization. These outcomes connect molecular placement with broader questions about cellular structure and function in biological studies.
Markers allow investigators to compare cellular organization and molecular localization across developmental states or altered biological conditions. Changes in the distribution of proteins, nucleic acids, organelles, or other structures can then be examined during disease or environmental stress. Such comparisons help assess how cellular architecture and function respond to biological change.