Functional Assay

15N and 1H liquid-state high-resolution NMR is an assay method used to detect light-induced photo-CIDNP signals in engineered Mr4511 flavoproteins. In the cited study, it reported nuclear hyperpolarization arising from a light-driven transient paramagnetic state in variants containing tryptophan at canonical or newly introduced positions.

The Affymetrix ATH1 microarray is a transcript expression assay for genome-scale expression profiling in Arabidopsis thaliana. In the cited AtGenExpress study, it was used to generate a comprehensive transcript dataset across abiotic stress conditions including UV-B light, drought, and cold.

The all-optical framework for functional testing of opsin responsiveness in cardiac fibroblasts is an assay method described to evaluate whether virally introduced optogenetic actuators are functionally responsive in primary cFB. In the cited study, it provides an optical functional readout for opsin-expressing cardiac fibroblasts and is associated with co-culture conditions that can yield a light-sensitive excitable cardiac syncytium.

The atomic force sensing technique is an assay method for dynamically probing protein conformational changes with microsecond time resolution. In the cited 1997 study, it was applied to light-induced conformational changes in bacteriorhodopsin.

Automated 96-well microplate illumination and measurement is an assay method for high-throughput optogenetic characterization of cultures under controlled light input. In the cited Saccharomyces cerevisiae workflow, it supported construction and characterization of split transcription factors containing cryptochrome and Enhanced Magnet light-sensitive dimerizers.

This Bayesian computational approach is a data-analysis method developed to improve prediction of split protein behavior by contextualizing errors inherent to experimental procedures. In the cited study, it was applied to pooled, sequencing-based screening data from split Cre recombinase constructs generated with optogenetic dimers, enabling comprehensive analysis of split sites across the protein.

The Bayesian optimization framework is a computational method built from high-throughput Lustro measurements to guide control of blue light-sensitive optogenetic systems. It uses data-driven learning, uncertainty quantification, and experimental design to identify light induction conditions for multiplexed regulation in Saccharomyces cerevisiae.

The Bessel beam stimulation source integrated into lattice light-sheet microscopy (LLSM) is an optical assay configuration that adds Bessel-beam-based optogenetic stimulation to LLSM without changing the microscope optical configuration. It enables three-dimensional photoactivation with improved spatiotemporal control and has been used to manipulate subcellular membrane ruffling and guide cell migration.

This tool is a bioreactor-based assay platform coupled to automated cytometry measurements for monitoring intracellular protein levels and secretory stress during production of hard-to-secrete proteins. It was reported as a real-time measurement platform to identify an optimal secretory-stress regime during protein production.

Biosensing is mentioned only as an emerging assay-related strategy expected to shape future directions in the field. The supplied evidence does not define a specific biosensor modality, analyte, or experimental implementation.

Bisulfite pyrosequencing is an assay method used to quantify promoter CpG DNA methylation after bisulfite treatment. In the cited study, it was used to measure methylation in the CAMK1D, CRY2, and CALM2 promoter regions in peripheral blood from patients with type 2 diabetes and matched healthy controls.

Caenorhabditis elegans light-induced coclustering (CeLINC) is a fluorescence-based optical binary protein-protein interaction assay for testing whether two proteins interact in vivo in C. elegans. It uses light-induced coclustering as the assay readout for protein association.

Cas12aVIP is a rapid visual nucleic acid detection assay that integrates recombinase polymerase amplification, a CRISPR/Cas12a detection system, and a PMNT plus single-stranded DNA color reporter. It was proposed for visual readout of target nucleic acids in a format intended to be rapid and directly observable.

A cDNA microarray is a gene-expression profiling assay used in Arabidopsis to examine how phyA pathway mutations affect far-red light control of genome-wide expression. In the cited study, it was applied to profile transcriptional responses associated with phytochrome A signaling and to compare mutant expression patterns.

Cell-free chromatin immunoprecipitation (cfChIP) is an assay method that immunoprecipitates histone mark-associated cell-free chromatin from blood plasma. In the cited study, cfChIP targeting H3K36me3-associated cfDNA was used with droplet digital PCR to infer transcriptional activity of specific genes, including EGFR, in the cells that released the cfDNA.

cfDNA fragmentomics evaluation is an assay method that analyzes plasma cell-free DNA fragment length distributions and fragment end motifs to identify signatures associated with active gene expression. In a 2024 study, integrating short-fragment frequency with end-motif information improved enrichment for highly expressed genes in plasma samples from lung cancer patients and healthy individuals.

Chlorophyll fluorescence lifetime measurements are an optical assay method used to detect free chlorophyll. In Arabidopsis chaos leaves, this method detected free chlorophyll before visible symptoms of oxidative stress appeared.

Chromatin immunoprecipitation sequencing (ChIP-seq) is an assay method that combines chromatin immunoprecipitation with sequencing-based genomic localization to map protein-associated genomic regions. In the cited study, it was used to identify genome-wide ZFHX3-binding sites in suprachiasmatic nucleus chromatin, revealing occupancy concentrated near transcription start sites and co-localization with known histone modifications.

Chromatin in vivo imaging is identified in a 2018 review as a CRISPR/Cas9-based epigenetic technique for imaging chromatin in living systems. The supplied evidence supports its existence as a method category within the CRISPR/Cas9 epigenetics toolkit, but does not describe a specific construct, protocol, or performance profile.

CIDNP (chemically induced dynamic nuclear polarization) is a phenomenon in which chemical reactions generate nuclear hyperpolarization. Photo-CIDNP is the light-driven form of this phenomenon and is discussed in electron-transfer systems that often use flavins as electron acceptors.

Comprehensive insertion libraries are a high-throughput engineering method in which many insertion variants are generated and screened. In the cited context, they are discussed as an approach that could accelerate creation of stimulus-responsive receptor–protein chimeras.

Computational protein design is an engineering methodology described in a 2018 review as a next-generation tool for expanding synthetic biology applications. The supplied evidence frames it as a design approach used alongside phage display and high-throughput binding assays rather than as a single molecular reagent.

Confocal microscopy is an in vivo fluorescence imaging assay method described as part of microscopy platforms tailored to larval zebrafish research. In the cited review context, it is used with fluorescent probes for real-time monitoring of cell identity, fate, and physiology in living larvae, including pancreatic and islet studies.

Cryogenic-temperature ENDOR spectroscopy is a spectroscopic assay method applied to LOV domains to interrogate the local environment of the flavin mononucleotide (FMN) cofactor. It does so by measuring temperature-dependent hyperfine couplings associated with hindered rotation of the methyl group attached at C(8) of the FMN isoalloxazine ring.

The custom Python-based API is a software interface for assembling automation workflows on an open-source microplate reader. It enables programmable control of automated assay protocols for an instrument demonstrated for full-spectrum absorbance, fluorescence emission detection, and in situ optogenetic stimulation.

dcFCCS is a dual-color fluorescence cross-correlation spectroscopy assay method used to quantify interactions relevant to cGAS phase separation. In the cited study, it was applied to systematically examine binding among cGAS, double-stranded DNA, and accessory proteins in relation to condensate formation and enzymatic activity.

The directional reaching for water behavioral framework is a head-fixed mouse assay in which animals make center-out-like reaches toward water droplets presented at multiple spatial locations. It enables structured study of cortex-dependent reaching, sensorimotor processing, and decision making, and has been used with optogenetic motor cortex inactivation.

The droplet microfluidic platform is an assay method for screening and separating cell populations based on the in vivo fluorescence response of expressed biosensors after addition of an exogenous analyte. It was applied to HeLa-cell genetic linker libraries for genetically encoded Zn2+ sensors to assess library diversity and detect response heterogeneity.

The dual transient visible absorption (visTA)/FSRS set-up is a broadband time-resolved spectroscopic assay that combines transient visible absorption with femtosecond stimulated Raman spectroscopy. It covers approximately 200–2200 cm^-1 and supports pump–probe delays from a few femtoseconds to several hundreds of microseconds after actinic light excitation, enabling monitoring of photoinduced dynamics.

Electron paramagnetic resonance (EPR) is an assay method used to monitor light-induced paramagnetic signals. In the cited study, it measures the kinetics of appearance and disappearance of signals assigned to P700+ and iron-sulfur protein(s) at low temperature.

Electron-electron double resonance (ELDOR) spectroscopy is a structural assay method that, when combined with site-directed spin labelling, was used to chart light-induced structural transitions in the engineered LOV histidine kinase YF1. In the cited study, it provided pairwise distance information used to model blue-light-driven quaternary rearrangements in a signaling photoreceptor.

Electron-transfer/higher-energy collision dissociation (EThcD) is a top-down mass spectrometry fragmentation method used in a combined workflow with 213 nm ultraviolet photodissociation (UVPD) to characterize covalent insulin dimers. In the cited study, this workflow identified cross-link chemical composition and, with MS3 analysis of informative MS2 fragments, enabled residue-level localization of interchain cross-link sites.

Electrophysiology is used as a functional assay in a multimodal study of gasdermin D pore behavior, alongside optogenetic tools and live-cell fluorescence biosensing. In the cited work, it supports measurement of pore conductance dynamics and the conclusion that gasdermin pores show phosphoinositide-dependent, repeated fast opening-closing behavior.

The endometrial receptivity assay (ERA) is a clinical assay intended to assess endometrial receptivity during the window of implantation. The supplied evidence indicates that, as a current test of the window of implantation, it does not consistently improve clinical outcomes measured by live birth rates.

Endometrial thickness measurement is a current clinical assay method used as a marker of the window of implantation and endometrial receptivity. The cited evidence indicates that, as a current test of the window of implantation, it does not consistently improve clinical outcomes measured by live birth rates.

EndoV-seq is an assay method reported for genome-wide profiling of adenine base editor specificity. The available evidence supports its use as a functional assay to identify where adenine base editing occurs across the genome.

Epigenetic element screening is described in a 2018 review as a CRISPR/Cas9-based epigenetic technique. The supplied evidence establishes only that it belongs to the set of CRISPR/Cas9-enabled approaches used in epigenetics, without further methodological detail.

This assay-method profile describes genomic analysis used to study light-regulated gene expression in plants. The cited review states that such studies revealed epigenetic regulation, massive transcriptome reprogramming in response to light, and genome-wide binding sites for pivotal light-signaling transcription factors.

An expressed sequence tag-based microarray is a microarray expression-profiling assay used to measure genome-scale transcript patterns in Arabidopsis. In the cited study, it was applied to profile gene expression underlying light-controlled development across different light conditions.

Field-domain rapid-scan EPR at 240 GHz is a high-frequency electron paramagnetic resonance assay method reported for studying protein functional dynamics at room temperature. The available evidence identifies it specifically as a field-domain rapid-scan EPR approach operating at 240 GHz.

The five-primary photostimulator is a light-delivery assay method that generates stimuli to selectively modulate melanopsin, rod, and S-, M-, and L-cone excitations in isolation or combination. It was used to measure human flicker pupillary responses and to examine how luminance and chromatic signals interact with melanopsin in control of the pupil light response.

Flash-and-freeze is an assay method that induces neuronal activity with a flash of light and captures membrane dynamics by rapid freezing. It was developed to visualize activity-evoked synaptic membrane trafficking with millisecond temporal resolution and was used to identify ultrafast endocytosis during neurotransmission.

FLIPR (Fluorometric Imaging Plate Reader) is a fluorescence-analysis instrument used as a miniaturized optogenetic assay platform in 384-well plates. In the cited study, FLIPR LEDs provided optical modulation to support recombinant cellular assays, including Channelrhodopsin-2 control of CaV1.3.

Fluorescence line narrowing (FLN) is a spectroscopic assay method used in the cited study to interrogate the electronic structure of flavin mononucleotide (FMN) within phototropin LOV2 domains. In this context, FLN was applied to support mechanistic analysis of how the conserved cysteine near FMN perturbs the chromophore ground state and promotes photochemistry.

The fluorescence method is a signal transformation modality used in CRISPR-Cas pathogen nucleic acid diagnostic platforms. In the cited context, Cas effector proteins recognize and cleave specific DNA or RNA targets, and fluorescence is combined with signal amplification and transformation technologies to report detection.

Fluorescence microscopy is an imaging assay method used to detect and localize fluorescent signals in living biological specimens. In the supplied evidence, it is described for larval zebrafish as a means to achieve subcellular fluorescence localization and real-time monitoring of cell identity, fate, physiology, and organ pathophysiology.

Fluorescence recovery after photobleaching (FRAP) is proposed as a functional assay readout for liquid-like molecular mobility within the pathological condensate termed the addivosome. In this context, FRAP is intended to detect restoration of mobility, or reliquefaction, during compound screening.

Fluorescence resonance energy transfer-fluorescence lifetime imaging microscopy (FRET-FLIM) is an assay method that combines fluorescence resonance energy transfer with fluorescence lifetime imaging to detect molecular proximity in living cells. In the cited Arabidopsis study, it was used to support a physical interaction between CRY2 and SPA1 in nuclei.

Fluorescent polarization is an assay method provided as a protocol for validating, improving, and using newly designed photoswitches in the context of LOV2-based optogenetic engineering. In the cited source, it is presented alongside phage display and microscopy as part of the experimental toolkit for photoswitch development.

Fluorescent probes are described as an expanding assay toolbox that can be combined with larval zebrafish for real-time in vivo monitoring of cell identity, cell fate, and physiology. In the cited review, this use context is framed for organ pathophysiology studies, including the pancreas and islets of Langerhans.

Fluorescent-protein-based methods are assay approaches discussed for evaluating the efficacy of CRISPR-based genome-editing systems in bacteria. The available evidence supports their use as fluorescence-based functional readouts of bacterial editing performance, but does not specify particular reporter proteins, construct architectures, or assay workflows.

FMN fluorescence is an optical metabolic imaging assay based on flavin mononucleotide autofluorescence. The supplied evidence indicates potential use for visualization and classification of brain tumor tissue during surgery.

FRASE, also described as FRASE-bot, is a computational fragment-based ligand discovery method that mines 3D ligand–protein complex structures to build a database of fragments in structural environments. It screens this database against a target protein, seeds the target structure with relevant ligand fragments, and uses a neural network to prioritize fragments with the highest likelihood of being native binders.

The FRET-based RhoA biosensor is an assay method developed to visualize RhoA activity during optical control experiments using photoswitchable RhoGEF (psRhoGEF). The available evidence supports its use for monitoring RhoA signaling in the context of endogenous RhoA manipulation.

Full-length transcriptome analysis is an assay method used to examine transcriptomic features associated with shade-induced promotion of tuber production in Pinellia ternata. The available evidence supports its application in this specific plant developmental context, but does not provide methodological detail beyond the study focus.

Genetic screens in Arabidopsis thaliana are a plant genetics method used to identify components of light-responsive signal transduction pathways. The cited evidence states that several laboratories devised such screens to dissect pathways associated with various photoreceptor systems.

Genetically encoded red fluorescence intensity-based small GTPase biosensors are assay reagents used to characterize optogenetic regulators of small GTPase activity. In the cited 2021 Journal of Biological Chemistry study, they were used to assess and confirm the specificities of iLID-based optogenetic small GTPase control tools.

Genome-wide transcription factor binding site mapping is a genomic assay approach used to identify binding sites across the entire genome for transcription factors involved in plant light signaling. In the cited review context, it links transcription factor occupancy to light-regulated gene expression programs in plants.

Glass nanopipette-based single-cell extraction is an ex situ single-cell sampling method that removes material from individual cells for downstream analysis. In the cited Chemical Science study, it was coupled to SiNx solid-state nanopores to identify LOV2 and monitor its conformational changes from single-cell extracts.

H3K36me3 cell-free chromatin immunoprecipitation sequencing (cfChIP-seq) is a plasma-based assay that establishes a personal gene expression profile from cell-free chromatin. In the cited study context, it functions as a reference enrichment assay for active genes in liquid biopsy samples.

H3K36me3 cfChIP followed by droplet digital PCR is a cell-free chromatin immunoprecipitation assay that enriches plasma cfDNA associated with the transcription-linked histone mark H3K36me3 and then quantifies specific alleles by ddPCR. In a 2021 NSCLC study, it detected greater enrichment of EGFR-L858R fragments than EGFR wild-type fragments, providing proof of principle for identifying tumor-specific transcriptional activity of mutated alleles.

Head mounted fluorescent microscopes are light-based imaging tools used in systems neuroscience to image neurons, neurocircuits, and their inputs and outputs. The supplied evidence places them within the recent expansion of functional imaging approaches but does not specify a particular instrument architecture or readout.

The Heidelberg Retina Tomograph (HRT) is a scanning laser ophthalmoscope with confocal optics used for macular volumetric quantification. In the cited study, an HRT-based method produced reproducible volumetric measurements of the normal macula.

High-throughput screening is an assay method cited in microbial biotechnology literature as part of the CRISPR/Cas toolbox for evaluating variants generated by multiplexed engineering. In the supplied evidence, it is presented as a screening approach associated with CRISPR/Cas-based metabolic engineering and with development of new dynamic systems.

High-resolution live imaging is cited as a methodological approach that provides new opportunities to study branching morphogenesis in living systems. The supplied evidence identifies it only at the level of a general live-imaging assay and does not specify the imaging modality, reporter strategy, or biological model.

High-throughput analyses of alternative splicing in response to light are proposed assay approaches for studying how light regulates pre-mRNA splicing and associated splicing complexes in plants. The cited literature presents this as a research strategy to advance mechanistic understanding rather than as a fully specified standalone tool.

High-throughput analyses of alternative splicing and splicing complexes in response to light are proposed as an assay-oriented strategy for studying light-regulated pre-mRNA splicing in plants. The literature describes this as a future analytical approach to support mechanistic investigation rather than as a fully specified standalone tool.

The high-throughput online monitoring system with an LED array is an assay platform for screening light-controlled gene expression conditions by individually illuminating each well in a multiwell format. In the cited yeast study, it was used with photocaged Cu2+ to regulate the Cu2+-inducible pCUP1 promoter from Saccharomyces cerevisiae and monitor eYFP expression.

Higher-energy collisional dissociation (HCD) is a top-down mass spectrometry fragmentation method referenced in a study characterizing covalent insulin dimers. The supplied evidence identifies HCD by name, but does not describe its specific analytical role, performance, or outcomes in that study.

Hydrogen-deuterium exchange coupled to mass spectrometry (HDX-MS) is an assay method used to complement structural characterization of light-activated photoreceptors. It reports on protein conformational dynamics in solution and can probe multiple functionally relevant states.

The hypocotyl elongation screen for ethylene-insensitive Arabidopsis mutants is a phenotypic assay based on ethylene-mediated inhibition of hypocotyl elongation in dark-grown seedlings. Arabidopsis mutants that remain tall despite treatment with high concentrations of ethylene are identified as ethylene-insensitive.

Immunohistochemistry is an antibody-based tissue staining assay used in the cited stroke study alongside transcriptomics and real-time polymerase chain reaction to examine post-stroke tissue in aged rats and post-stroke patients. In that context, it supported assessment of angiogenesis-related histological features such as vascular density after stroke.

In silico feedback control strategies are computationally implemented control schemes coupled to optogenetic measurement and light stimulation platforms. They are used to create computer-controlled living systems through automated measurement and stimulation workflows.

In vivo PET with [(11)C]-PE2I is a radiotracer imaging assay used to assess dopamine degeneration in MPTP-treated non-human primates. In the cited study, it was applied alongside post-mortem tyrosine hydroxylase and dopamine transporter quantification.

The in-gel assay is a functional assay method used to detect protein kinase activity within a gel matrix. In the cited Arabidopsis study, it was used to show that OST1 is an abscisic acid (ABA)-activated protein kinase involved in stomatal signaling.

The IRAP-pHluorin translocation assay is a live-cell kinetic imaging assay that monitors translocation of an IRAP/LNPEP-pHluorin reporter as a surrogate readout for GLUT4 trafficking in adipocytes. In the cited study, it was used to quantify stimulus-dependent membrane translocation responses downstream of optogenetic PI3K/PIP3 and Akt pathway activation.

Iris is an intuitive web tool for programming light signals in optogenetics and photobiology experiments. In the supplied evidence, it is linked to programming illumination for BphP1-QPAS1-based systems, including the iRIS platform for light-controlled protein localization.

Isothermal titration calorimetry (ITC) is a thermal biophysical assay that quantifies binding-associated heat changes under isothermal conditions. In the cited study, ITC was used to support thermodynamic analysis of binding between CIB1 and α-integrin cytoplasmic tails.

Juxtacellular recording is an electrophysiological assay method identified as an emerging technique that can be combined with the optogenetic toolbox. In the cited epilepsy context, it is positioned as a recording approach used alongside light-driven perturbation to help identify cortical and hippocampal neuron subtypes altered in epileptic networks.

This assay method combines a lateral flow assay strip test with a CRISPR/Cas12a sensing system to visualize nucleic acid cleavage signals. In the cited 2024 Analytical Chemistry study, it was presented within a photoactivatable CRISPR/Cas12a platform for DNA and RNA detection with point-of-care diagnostic potential.

Lateral flow technology is a signal transformation format used within CRISPR-Cas pathogen nucleic acid diagnostic platforms. In the supplied evidence, it functions alongside Cas protein-based sequence recognition and cleavage and with signal amplification approaches for rapid molecular diagnosis.

Lattice lightsheet microscopy (LLSM) is a modified light-sheet imaging platform used for three-dimensional optogenetic activation with subcellular resolution. In the cited 2022 study, it enabled high-spatiotemporal-resolution manipulation of cellular behavior, including membrane ruffling and guided cell migration.

LC-MS analysis of fittest binders is an assay method used with small combinatorial libraries of self-assembled proteomimetics (SAPs) to identify enriched target binders after affinity selection by liquid chromatography–mass spectrometry. In the cited SAP study, this workflow was applied in the context of target-directed selection from self-assembled PNA-peptide conjugate libraries.

The light-dark masking paradigm is a functional assay used in MPTP-treated non-human primates to test how environmental light and darkness acutely shape daily rest-wake and locomotor activity expression. In the cited study, it showed that expression of daily rest-wake activity in dopamine-depleted monkeys requires the stimulatory and inhibitory effects of light and darkness.

The light-induced co-clustering assay is an optogenetic functional assay used to assess protein-protein interactions in Drosophila S2 cells. It was reported in the context of light-induced protein clustering and uses co-clustering as the interaction readout.

Light-induced Fourier transform infrared (FTIR) difference spectroscopy is an assay method for detecting light-triggered structural changes associated with signaling-state formation in photoreceptor proteins. In the cited literature, it was applied to blue-light sensing LOV and BLUF/FAD systems to measure protein- and chromophore-associated spectral changes after illumination.

Light-sheet microscopy, also termed single plane illumination microscopy, is an in vivo fluorescence imaging method tailored to larval research and embryonic imaging. The supplied evidence indicates that it can capture the full course of embryonic development from egg to larva and has been coupled with optogenetic perturbation to study Wnt signaling during embryogenesis.

The liquid-crystal-on-silicon spatial light modulator is an LCOS-based device engineered for phase-only optical modulation. It modulates incident light wavefronts with a phase range exceeding one wavelength and was developed for wavefront control applications including adaptive optics, optical manipulation, and laser processing.

Live-cell imaging is an assay method used in neurons in culture and brain slices to observe dynamic cellular processes in real time. The cited studies applied it to visualize minute-scale membrane PI(3,4,5)P3 fluctuations and microtubule retrograde flow during neuronal polarization-related dynamics.

The localized GEF recruitment assay system is an optogenetic functional assay that uses blue light-inducible cryptochrome- and LOV-domain dimerization to recruit guanine nucleotide exchange factors with spatiotemporal precision. It is used to probe how local network activation drives changes in cell polarity and directed migration.

Lustro is a high-throughput optogenetics platform for studying and controlling blue light-sensitive optogenetic systems. In the cited 2023 work, it was combined with machine learning to achieve multiplexed control of split transcription factor responses in Saccharomyces cerevisiae.

Macular volumetric quantification above a reference plane is an imaging-based assay implemented on the Heidelberg Retina Tomograph to measure macular tissue volume above a defined reference plane. It quantifies volume within 1 mm, 2 mm, and 3 mm diameter circles centered on the fovea and was reported to be reproducible in normal subjects.

Magnetic-field dependent 13C NMR spectroscopy is a solution-state photo-CIDNP assay in which 13C NMR spectra are acquired across multiple magnetic fields under light activation. In the cited 2014 study, it was applied to the LOV2-C450A domain of phototropin over 4.7–11.8 T to detect field-dependent 13C photo-CIDNP signals and support interpretation involving a novel triplet mechanism.

Mass spectrometry is an analytical assay method used to characterize light-induced modifications in therapeutic proteins. In the cited 2022 Journal of Pharmaceutical Sciences study, it was applied to detect and describe protein changes arising after light exposure.

Microarray expression profiling is a transcriptomic assay used in developing soybean (Glycine max) seeds to identify mRNAs under circadian clock control. In the cited study, it measured rhythmic transcript abundance, quantified the fraction of circadian-regulated mRNAs, and enabled comparison of expression phase and functional categories between seed and leaf tissues.

Microarray gene expression profiling is a transcriptome-scale assay method used in Arabidopsis seedlings to measure genome-wide expression changes under genetic and light-regulated perturbations. In the cited studies, it was applied to define how COP/DET/FUS loci and COP1 regulate light-responsive gene expression and seedling development.

Microfluidic single-cell analysis is an assay method used during microfluidic cultivation to quantify growth behavior and expression phenotypes at single-cell resolution. In the cited 2016 E. coli study, it was applied comparatively across PT7lac/LacI, PBAD/AraC, and Pm/XylS expression systems to reveal dynamic and spatiotemporal heterogeneity in recombinant protein production.

Microscopy is a protocolized assay method included alongside fluorescent polarization and phage display in a 2020 methods source on engineering and applying LOV2-based photoswitches. In that context, it is used as part of the experimental workflow for validating, improving, and using light-responsive optogenetic switches built on the LOV2 domain.

Multi-electrode array recording is an electrophysiological assay method that measures extracellular action potential firing from the retinal ganglion layer. In the cited study, it was used with the array in contact with the retinal ganglion layer to detect light-evoked responses.

Multicomponent, ligand-functionalized microarrays are a patterned substrate assay method for individual living cells that spatially segregates distinct ligand presentations to enable simultaneous monitoring of receptor activation and downstream signaling. The method was developed to probe clustering-dependent EphA2 signal transduction.

Multiplexed engineering refers here to the use of the CRISPR/Cas toolbox for simultaneous genome engineering tasks in microbial biotechnology. The cited review places this approach in the context of metabolic engineering and high-throughput screening for production of chemicals and natural compounds.

The NanoLuc luciferase reporter assay is a bioluminescent functional reporter assay used to test guide RNA efficiency. In the cited study, it served as a pre-screening step to identify optimal guide RNAs before downstream cell-based experiments with an optogenetic CRISPR-dCas9 LITE system.

The native green gel system is an assay method used to study light-induced assembly of chlorophyll-protein complexes during greening. In etiolated barley (Hordeum vulgare), it was used to resolve LHCII-associated bands and follow the appearance of type 1, type 2, and type 3 LHCII apoproteins during illumination.

NCBI sequence screening for 2A/2A-like occurrence is a computational survey method that updates the distribution of viral 2A and 2A-like sequences by screening sequences deposited in the National Center for Biotechnology Information database. In the cited 2021 review, this approach identified 69 newly reported 2A-like occurrences across multiple virus groups.

NIR light-based imaging is an optical assay and photoregulation approach that uses near-infrared light to sense, and in some cases modulate, specific cellular events in living systems. The cited review describes these strategies as enabling real-time interrogation of deep tissues with subcellular accuracy.

Nitrogen vacancy (NV) diamond centers are described as a methodological approach for following cryptochrome magnetic field sensitivity in vivo. In the cited review, they are presented as an assay-related innovation for studying magnetically sensitive cryptochrome biology.

The OMR assay, also termed the optomotor assay, is a light-based functional assay used in TKO mice to quantify the efficacy of optogenetic tools for vision restoration. It measures properties of optogenetically restored vision through behavioral optomotor response assessment.

The open-source microplate reader is a low-cost, open-source assay platform for automated plate-based measurements. It was designed, constructed, validated, and benchmarked to support full-spectrum absorbance detection, fluorescence emission detection, in situ optogenetic stimulation, and stand-alone touch screen programming of assay protocols.

OptoAssay is a light-controlled dynamic bioassay that integrates optogenetic switches to regulate assay behavior. It was introduced as the first light-controlled assay for wash- and pump-free point-of-care diagnostics and enables wavelength-dependent, reversible control of assay components.

The parsley protoplast transient expression system is a plant cell-based transient reporter assay used to test light-regulated transcription from introduced promoter constructs. In the cited study, chalcone synthase (CHS) promoter-GUS constructs in parsley protoplasts reproduced the same type of photoregulation observed for the endogenous CHS gene.

Phage display is an assay and selection method used during engineering workflows for light-responsive protein tools. In the cited context, it is applied alongside computational protein design and high-throughput binding assays in development of LOV2-based optogenetic systems such as improved light-induced dimers.

photo-CIDNP is a light-driven form of chemically induced dynamic nuclear polarization in which chemical reactions generate nuclear hyperpolarization. The cited review discusses this phenomenon in the context of flavoprotein spin dynamics and electron-transfer systems that often use flavins as electron acceptors.

Plant transcriptome profiling is a genomic assay approach used to measure light-induced changes in plant gene expression. The cited review describes light as causing massive reprogramming of plant transcriptomes and places transcriptome-scale profiling within genomic studies of light-controlled plant development.

The pooled library approach is an engineering method for rapid generation and parallel screening of nearly all possible split-protein constructs, with sequencing-based readout. In the cited application, it was used with optogenetic dimers to comprehensively map split-site behavior across Cre recombinase and support inducible post-translational control design.

The pulsed laser-induced transient grating technique is a time-resolved optical assay method used to detect conformational changes in proteins in solution after photoexcitation. In the cited application, it was used to monitor time-domain conformational changes in oat phytochrome A following excitation of the red-absorbing Pr form.

qRT-PCR is a quantitative reverse-transcription PCR assay used to measure transcript abundance, here applied to GFP mRNA during light-controlled gene expression in Synechococcus sp. PCC 7002. In the cited study, it quantified transcriptional activation and deactivation kinetics of optogenetic systems under green/red and light/dark illumination cycles.

Quantitative chromatin immunoprecipitation (qChIP) is an assay method for measuring protein association with specific chromatin regions. In the cited Ustilago maydis study, qChIP analysis supported direct binding of the UPR regulator Cib1 to UPRE-containing promoter fragments of pit2 and tin1-1.

The rapid transient expression assay system is a microprojectile-mediated transient gene transfer method developed to study DNA sequences involved in phytochrome-regulated phy gene expression. It enables promoter construct readout in less than 24 hours after particle bombardment and is used to assess light-regulated transcriptional responses.

Receptor-antibody sandwich assays are assay methods established for detection of Bacillus thuringiensis Cry1 and Cry2 toxins. The reported assays are described as broadly detecting toxins within the Cry1 and Cry2 groups.

Recombinase polymerase amplification (RPA) is used in the cited study as an amplification component within a combined diagnostic workflow that also includes photoactivated CRISPR-Cas12a and a tube-in-tube structure for visual detection of HPV16. The supplied evidence supports its inclusion in this integrated assay, but does not provide mechanistic detail about RPA itself.

Reverse cross-saturation NMR methodology is an NMR assay approach that maps the binding interface on a larger binding partner by applying selective radio-frequency irradiation to a smaller binding partner. In the cited study, irradiation of the αIIb peptide enabled detection of the interaction surface on Ca2+-bound CIB1.

Reversible protein highlighting is a light-based live-cell imaging assay that uses a photochromic fluorescent protein to repeatedly highlight, erase, and re-highlight labeled molecules without destructive readout. It was applied to visualize stimulus-dependent, bidirectional nucleocytoplasmic shuttling of extracellular signal-regulated kinase (ERK) across the nuclear envelope.

RNA sequencing (RNA-seq) is a transcriptomic assay method that quantifies gene-expression changes by sequencing RNA-derived libraries. In the cited study, it was used on adult rat amygdala tissue to detect subtle expression changes associated with development, cellular function, and nervous system disease after gestational high-THC cannabis smoke exposure.

Root-specific transcriptomic dataset comparison is a comparative transcriptomic assay approach used to identify transcripts that respond consistently to elevated ethylene across multiple root datasets. In the cited review, this approach defined a core set of 139 ethylene-responsive root transcripts.

Screening based on selective labeling is identified in a 2023 review as an available genetic engineering tool within Aspergillus genome engineering workflows. The supplied evidence supports only that it is used as a screening approach associated with Aspergillus genetic technology, without operational or performance details.

Sensitive FRET imaging is an assay method used in combination with optogenetics to monitor local microtubule manipulations. The available evidence identifies it as a light-associated functional imaging approach for observing spatially localized perturbations of the microtubule system.

Sequencing-based solutions are proposed assay methods for detecting large-scale CRISPR-associated genomic alterations. In the cited review, they are positioned as potential approaches to identify rare events such as translocations, inversions, deletions, and chromothripsis that can be missed by current workflows.

Serial crystallography at pump-probe delays is a time-resolved structural characterization method that collects crystallographic data at defined times after light excitation. In the cited KR2 study, it was used to follow the light-driven sodium pump photocycle across ten delays spanning femtoseconds to milliseconds and capture structural intermediates over time.

Serial femtosecond crystallography is a time-resolved structural characterization assay used to track light-triggered protein photoreactions from femtoseconds to the microsecond regime. In the cited fluorescent protein study, it resolved chromophore isomerization and twisting and provided structural evidence for a hula twist photoactivation mechanism linked to beta-barrel rearrangements.

Single cell FRET measurements with Rho GTPase biosensors are a quantitative cell-based assay used in primary human endothelial cells to monitor guanine nucleotide exchange factor activity toward Cdc42 and Rac1. In the cited study, the method was applied to compare the cellular activities of overexpressed endothelial GEFs.

Single-cell measurements are assay methods used to study cellular dynamics at the level of individual cells. The supplied evidence indicates that technological improvements have increased their throughput and capabilities.

Single cell-based analysis is a quantitative cellular assay framework developed to compare the activities of overexpressed full-length guanine nucleotide exchange factors in primary human endothelial cells. It was applied with single-cell FRET Rho GTPase biosensors to measure GEF-driven activation of Cdc42 and Rac1.

Single-cell RNA sequencing (scRNA-seq) is a transcriptomic assay method that measures RNA molecules in individual cells by sequencing-based transcript detection. In the cited application, it detected FLiCRE transcripts within the endogenous transcriptome, enabling simultaneous readout of cell type and calcium activation history.

Site-directed spin labelling, used with electron-electron double resonance (ELDOR) spectroscopy, is a structural assay method for charting blue-light-induced conformational changes in proteins. In the cited study, it was applied to the engineered LOV histidine kinase YF1 to obtain distance information on light-dependent structural transitions and quaternary rearrangements.

Small-angle X-ray scattering (SAXS) is a structural characterization assay used to directly observe solution-state conformational changes in light-responsive proteins. In the cited phototropin literature, SAXS was used with other biophysical approaches to study multidomain phototropins from Chlamydomonas and Arabidopsis.

The solid-phase competitive binding assay is an in vitro binding assay used to test whether α-integrin cytoplasmic tails compete for association with CIB1. In the cited 2020 study, it supported the conclusion that multiple α-integrin tails can compete with the αIIb cytoplasmic tail for a shared CIB1-binding site.

The spatial light modulator pattern-based activation source in lattice light-sheet microscopy is an assay method that generates stimulating light by changing spatial light modulator patterns and annular masks. In the cited implementation, a Bessel beam stimulation source was integrated into LLSM without changing the optical configuration to enable photoactivation with improved spatiotemporal control.

Spatial transcriptomics is a transcriptomic assay method identified in the supplied review as a recent methodological advance. In that evidence, it is presented as part of a broader technology set that enables easier and more accurate visualization of cell behavior and qualitative and quantitative analysis of cell-cell interactions.

Stroke transcriptomics is a gene-expression profiling assay applied to post-stroke tissue and combined with immunohistochemistry in aged rats and post-stroke patients. In the cited study, it was used to characterize post-stroke angiogenesis-associated transcriptional programs and relate them to vascular density differences across age groups.

SUMO urban mobility simulator assessment is a simulation-based functional assay used to evaluate a multi-intersection traffic management system. In the cited 2024 study, it assessed a visible light communication-enabled, learning-driven traffic signal control approach and reported reduced waiting time and travel time in multi-intersection scenarios.

Temperature-dependent FTIR spectroscopy is a structural characterization assay used to record conformational heterogeneity and the propagation of structural changes in the LOV2/Jα domain from Avena sativa phototropin 1. In the cited work, it functions as an infrared spectroscopic method for analyzing a light-responsive protein domain.

Tension sensors are assay methods cited as emerging tools for studying branching morphogenesis. In the supplied evidence, they are presented as part of a methodological set that can create new opportunities for future research.

TiGGER is a 240 GHz time-resolved Gd-Gd electron paramagnetic resonance assay for tracking inter-residue distances during a protein mechanical cycle in the solution state. It was demonstrated on the light-responsive AsLOV2 domain to resolve time-dependent structural separation and relaxation after photoactivation.

Time-resolved EPR is an assay method used to investigate light-triggered functional dynamics in the AsLOV2 photosensory domain at high magnetic fields. The supplied evidence supports its use as a light-responsive biophysical readout for AsLOV2.

Time-resolved Gd-Gd electron paramagnetic resonance (TiGGER) is a 240 GHz EPR-based assay method for tracking inter-residue distances during a protein mechanical cycle in the solution state. It is positioned as a method to study triggered functional dynamics in proteins.

Time-resolved infrared spectroscopy, also termed transient infrared spectroscopy, is a light-triggered functional assay that monitors vibrational and structural dynamics of LOV photoreceptors on picosecond-to-microsecond timescales. In the cited studies, it resolved FMN triplet-state progression to cysteinyl-FMN adduct formation and subsequent protein conformational changes, including Jα helix unfolding.

Time-resolved serial oscillation crystallography is a synchrotron-based, room-temperature X-ray diffraction method that collects, processes, and merges monochromatic oscillation data from fewer than 100 crystals. It was used to follow light-driven structural changes in a blue-light photoreceptor domain with 63 ms time resolution and to visualize time-dependent rearrangements of both the protein and its chromophore.

Time-resolved vibrational spectroscopy coupled with isotope labeling is an assay method used to resolve light-triggered structural dynamics in the Avena sativa LOV2 (AsLOV2) photosensory domain. In the cited study, it mapped structural evolution from 100 fs to 1 ms after optical excitation and supported a sequential allosteric model linking the flavin pocket to Jα-helix unfolding.

This entry refers broadly to imaging-oriented tools and sensors associated with bacterial degron and degrader concepts. The supplied evidence only states that bacterial degrons can be used to interrogate and control protein function and mentions “tools and sensors for imaging,” without defining a specific construct, sensor architecture, or imaging readout.

Top-down mass spectrometry is an assay method for de novo characterization of covalent insulin dimers formed under Fe2+ incubation or UV light stress. In the cited workflow, combined EThcD and 213 nm UVPD enabled identification of cross-link chemical composition and residue-level cross-link sites.

Touchscreen-equipped operant conditioning chambers are a behavioral assay platform for measuring visual pairwise discrimination and reversal learning. In the cited 2023 study, they were used to quantify cognitive performance in Sprague Dawley rat offspring after gestational exposure to high-THC cannabis smoke.

TR-FRET assay is a time-resolved fluorescence resonance energy transfer binding assay used in the cited study to confirm binding of a small-molecule ligand to CIB1. In this evidence set, it functions as a chemical-input assay for ligand-binding confirmation.

Two-dimensional transient absorption (2D-TA) is a transient absorption spectroscopy assay used with a streak camera to search for short-lived photochemical intermediates in LOV domain photocycles. In the cited study, it was applied extensively and did not detect an intermediate with a rate constant between fluorescence decay and triplet-state decay.

Two-photon guided whole-cell recording is an emerging electrophysiological assay method identified as combinable with the optogenetic toolbox. In the cited epilepsy context, it is positioned for recording from defined cells while optogenetic perturbations are used to probe circuit function.

Two-photon imaging is a light-based imaging assay method identified as one of the approaches recently incorporated into systems neuroscience for imaging neurons, neurocircuits, and their inputs and outputs. The supplied evidence places it within the broader emergence of molecularly oriented systems neuroscience.

This assay method is an adapted ultra-widefield microscopy platform used for parallel light patterning in up to 36 embryos. It enables precise spatial control of optogenetically driven Nodal signaling activity and downstream gene expression in developmental experiments.

Ultrafast mid-infrared spectroscopy is an assay method used to study primary light-driven reactions in the LOV2 domain of phototropin. In the cited 2009 Biophysical Journal study, it was applied together with quantum chemistry to investigate early photochemical events.

213 nm ultraviolet photodissociation (UVPD) is a top-down mass spectrometry fragmentation method used to characterize covalent insulin dimers. In the cited study, it fragmented cross-links and nearby backbone bonds and, together with multistage analysis or complementary fragmentation, supported identification of cross-link composition and residue-level cross-link sites.

Whole-genome screening of gene knockout mutants in Toxoplasma gondii is a CRISPR/Cas9-based assay method for generating and interrogating genome-scale loss-of-function mutant populations. The cited review identifies this as a recent use of CRISPR/Cas9 in an apicomplexan parasite.

Zebrafish spinal cord injury paradigms are experimental assay methods used to study central nervous system axon regeneration and functional recovery in zebrafish. The cited review presents these paradigms as a framework for investigating the strong regenerative capacity observed in fish after spinal cord injury.