Egfp Assay
Egfp Assay - Related Videos
11:43
Easy Measurement of Diffusion Coefficients of EGFP-tagged Plasma Membrane Proteins Using k-Space Image Correlation Spectroscopy
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Cited by 37 •
2014
This paper provides a step by step guide to the fluctuation analysis technique k-Space Image Correlation Spectroscopy (kICS) for measuring diffusion coefficients of fluorescently labeled plasma membrane proteins in live mammalian cells.
10:03
Development of Leishmania Species Strains with Constitutive Expression of eGFP
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2023
Here, we describe the methodology used for generating L. panamensis and L. donovani strains expressing the gene for eGFP as a stable integrated transgene using the pLEXSY system. Transfected parasites were cloned by limiting dilution, and clones with the highest fluorescence intensity in both species were selected for further use in drug screening assays.
10:20
Studying Membrane Protein Trafficking in Drosophila Photoreceptor Cells Using eGFP-Tagged Proteins
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Cited by 1 •
2022
Here, non-invasive methods are described for localization of photoreceptor membrane proteins and assessment of retinal degeneration in the Drosophila compound eye using eGFP fluorescence.
14:39
A Quantitative Assay for Insulin-expressing Colony-forming Progenitors
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Cited by 11 •
2011
A three-dimensional clonogenic assay that allows pancreatic-like progenitors to differentiate into insulin-expressing colonies is described. This method takes advantage of semi-solid media containing methylcellulose, Matrigel and growth factors, in which single progenitors proliferate and differentiate in vitro, permitting quantification of the number of functional progenitors in a population.
10:54
Reliable Identification of Living Dopaminergic Neurons in Midbrain Cultures Using RNA Sequencing and TH-promoter-driven eGFP Expression
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Cited by 9 •
2017
In Parkinson's Disease (PD), Substantia Nigra (SNc) dopaminergic neurons degenerate, leading to motor dysfunction. Here we report a protocol for culturing ventral midbrain neurons from a mouse expressing eGFP driven by a Tyrosine Hydroxylase (TH) promoter sequence, harvesting individual fluorescent neurons from the cultures, and measuring their transcriptome using RNA-seq.
FAQs
The EGFP signal depends on the fluorescent protein folding into a chromophore, the light-absorbing structure that produces green emission after excitation. This molecular event converts expression of the reporter into a detectable optical readout. Measuring the resulting fluorescence allows researchers to assess where and when the reporter is present in living or fixed samples.
An EGFP fusion can link fluorescence to the distribution of a specific protein, so the signal pattern provides information about where that protein is located within a biological sample. Examining fluorescence distribution by microscopy helps connect protein position with tissue formation, cell behavior, or developmental changes rather than measuring expression alone.
Fluorescence intensity indicates how strongly the EGFP-associated signal can be measured, whereas distribution shows where that signal occurs across cells or tissues. Considering both features helps distinguish changes in signal amount from changes in spatial organization. In developmental studies, this combination supports analysis of regulatory activity alongside tissue patterning and differentiation.
A typical workflow uses cells or tissues expressing an EGFP fusion or reporter construct, followed by fluorescence detection in living or fixed samples. Researchers then examine the signal with microscopy or a fluorescence-based instrument and measure its intensity or distribution. These measurements provide a basis for comparing expression patterns, localization, or cell behavior.
Microscopy is useful when the spatial arrangement of EGFP signal must be examined across cells, tissues, or developing structures. Other fluorescence-based instruments can provide measurable signal intensity without requiring the same image-based analysis. The choice therefore depends on whether the main outcome is localization and pattern or a fluorescence measurement suitable for quantitative comparison.
In developmental biology, EGFP measurements can follow tissue formation, lineage specification, cell migration, and tissue differentiation. Tracking signal across developmental stages connects regulatory-element activity or gene expression with changing spatial patterns. This approach helps researchers relate molecular regulation to the organization and behavior of cells as embryonic tissues develop.