Seeding Activity Detection
Seeding Activity Detection - Related Videos
12:31
Sensitive Detection of Proteopathic Seeding Activity with FRET Flow Cytometry
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Cited by 102 •
2015
Cell-to-cell transfer of protein aggregates, or proteopathic seeds, may underlie the progression of pathology in neurodegenerative diseases. Here, a novel FRET flow cytometry assay is described that enables specific and sensitive detection of seeding activity from recombinant or biological samples.
03:44
Detection of Inflammasome Activation via Fluorescence Microscopy
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2025
This video demonstrates a method to detect NLRP3 inflammasome activation in macrophages using fluorescent reporter probes. The cells are treated with potassium ionophores and glycine to induce inflammasome assembly and caspase-1 activation. Fluorescent reporter probes visualize activated caspase-1, and cells are stained with a fluorescent dye for nuclei visualization.
04:11
A FRET Flow Cytometry Technique to Detect Tau-Seed Induced Reporter Protein Aggregation
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2025
The video demonstrates a fluorescence resonance energy transfer (FRET) flow cytometry assay to detect the seeding activity of protein aggregates isolated from biological samples. Mammalian cells expressing tau reporter proteins are incubated with liposome transduction complexes containing tau seeds. These seeds mediate the aggregation of the reporter proteins, leading to generating a FRET positive signal in the flow cytometer.
09:04
Detection of Neu1 Sialidase Activity in Regulating TOLL-like Receptor Activation
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Cited by 39 •
2010
The sialidase assay is a simple technical approach that will elucidate novel molecular mechanism(s) of TLR sensors of microbial infections and involvement in inflammatory diseases at the receptor level on the cell surface of live macrophages.
02:33
Seed Structure and Early Development of the Sporophyte
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2020
Seed structures are composed of a protective seed coat surrounding a plant embryo, and a food store for the developing embryo. The embryo contains the precursor tissues for leaves, stem, and roots. The endosperm and cotyledons—seed leaves—act as the food reserves for the growing embryo. The embryo contains a double set of chromosomes, one set from each parent. Fertilization of the haploid egg by the haploid sperm gives rise to the zygote, which develops into the embryo. The endosperm is a...
FAQs
The key mechanistic feature is conversion of soluble substrate into organized aggregates by pre-existing molecular seeds. Once a seed encounters a susceptible substrate, repeated incubation, agitation, or amplification cycles can make the conversion measurable, even when the starting activity is low. This links the observed signal to assembly competence rather than simply to total aggregate abundance.
Sequence, environmental conditions, and engineered interventions can all influence how effectively a sample promotes substrate assembly. These variables may alter the compatibility between seed and substrate or change the tendency of the substrate to organize into aggregates. Comparing conditions systematically allows researchers to examine why aggregate variants behave differently and how assembly might be controlled.
Signal changes provide an operational way to distinguish seed-positive from seed-negative materials and to compare relative activity among samples. The measured response can also support estimates of seeding activity and reveal differences between aggregate variants. Interpretation depends on the conversion observed during the assay, rather than on the presence of soluble biomolecules alone.
A typical workflow combines the test sample with a susceptible substrate under controlled conditions. The mixture then undergoes repeated incubation, agitation, or amplification cycles that promote seed-driven conversion. Fluorescence or another measurable signal is monitored as assembly proceeds. Researchers use the resulting signal changes to classify samples, compare activity, or assess effects of selected variables.
Bioengineers can apply seeding activity detection when they need to compare aggregate variants, evaluate how sequence or environment affects assembly, or test engineered interventions. The method is also relevant to biomaterial design, where unwanted or intentional assembly may influence material behavior. Its central value is connecting molecular assembly activity with design and control decisions.
The assay helps examine whether materials contain activity associated with organized aggregate propagation, supporting biosafety assessment and mechanistic studies of disease-associated processes. It can also inform development of diagnostic strategies and anti-aggregation approaches by revealing differences in seed activity under controlled conditions. These applications extend measurement beyond aggregate presence to the capacity to initiate further assembly.