Toolkit Items

The (C120)5-CYC102 responsive promoter architecture is a blue-light-inducible transcriptional output module comprising five copies of the C120 upstream activation sequence fused to the minimal promoter CYC102. In an EL222-based single-component system in Yarrowia lipolytica, it mediated blue-light-dependent expression of the GFPMut3 reporter.

AKAR3EV is a previously developed genetically encoded Förster resonance energy transfer (FRET) biosensor for protein kinase A activity that comprises a CFP/YFP fluorescent protein pair. In the cited 2020 ACS Sensors study, it served as the benchmark comparator for the red-shifted Booster-PKA biosensor.

The alkynyl-functionalized photocleavable linker is a construct pattern used in caged antisense morpholino reagents, in which an ethynyl-bearing photocleavable linker is coupled to an oligonucleotide. In the caged state it inhibits DNA binding, and brief 405-nm illumination restores antisense activity through linker photocleavage.

The allelic series of Cry mutants is a panel of 22 cryptochrome variants, each carrying a single amino acid substitution identified by random mutagenesis and a cell-based screen. The series was used to generate diverse deficiencies across CRY functions and to identify residues involved in protein-protein interaction and CRY2-specific repression.

The alpha-helical domain linker is a construct pattern in which a rigid alpha-helical segment is placed between fused protein domains to couple their functions. In the cited design context, it is proposed to act as a helical allosteric lever arm that transmits conformational information between domains.

Animal opsin-based pigments are light-responsive receptor systems composed of an opsin protein bound to the chromophore 11-cis retinal. Most are typical G protein-coupled receptors, and their diversity, particularly among nonconventional visual pigments, has been proposed as a basis for optogenetic modulation of GPCR signaling.

The antisense oligodeoxynucleotide against Per1 is a nucleic acid perturbation reagent used in the rat suprachiasmatic nucleus to suppress Per1 function during circadian signaling experiments. In the cited study, this antisense ODN blocked glutamate-induced phase advances, implicating Per1 in light-responsive clock resetting.

The Arabidopsis phyA:GFP fusion protein is a fluorescent phytochrome A construct expressed in phyA-deficient Arabidopsis and used to monitor light-regulated intracellular behavior. In Arabidopsis, the construct complements the phyA mutant phenotype and reports light-dependent subcellular partitioning, including nuclear import and cytosolic sequestered area formation.

Archer1 is an engineered archaerhodopsin-based genetically encoded construct with enhanced voltage-sensitive fluorescence in neurons. It reports action potentials with 25–40% fluorescence changes and can be used in a wavelength-specific manner as a red-light voltage sensor or a green-light inhibitory actuator.

Archers are engineered archaerhodopsin (Arch) variants with enhanced radiance that function as genetically encoded voltage-sensitive fluorescent reporters. Under 655 nm illumination, the reported variants show 3–5-fold higher fluorescence and 55–99-fold lower photocurrents than wild-type Arch, and Archer1 additionally shows wavelength-dependent sensing and inhibitory actuation.

The artificial differentiation system is a light-tunable construct pattern in budding yeast based on optogenetically driven genetic rewiring. It is designed to generate stable microbial consortia with user-defined composition in space and time from a single strain and supports dynamic control of consortium composition in continuous culture.

Aryl azides are light-activatable chemical groups that remain chemically inert under physiological conditions until irradiation induces reactive intermediates. In visible-light-enabled live-cell settings, they have been used for protein labeling applications including functionalization, crosslinking, and profiling in extracellular and intracellular contexts.

Autophagy-tethering chimeras are a proposed construct pattern intended to promote selective autophagic clearance of the pathological condensate termed the addivosome. The concept is to target chimeric constructs to drug-induced molecular signatures associated with this condensate, but the supplied evidence is conceptual rather than experimentally validated.

The autorepression-based conditional gene expression system is a yeast genetic controller in which TetR represses both a gene of interest and its own expression, creating a negative-feedback autorepression loop. Addition of anhydrotetracycline relieves TetR-mediated repression to enable conditional control of protein dosage with reduced cell-to-cell variation.

The auxin degron-AcrIIA4 fusion is a plant-expressed anti-CRISPR construct pattern in which the Cas9 inhibitor AcrIIA4 is fused to an auxin-responsive degron. In Nicotiana benthamiana, this fusion enables auxin-regulated activation of a downstream reporter gene by modulating AcrIIA4 repression of CRISPR/dCas-based transcriptional activation.

The azobenzene-cyclodextrin host-guest siRNA release module is a light-responsive siRNA carrier motif built on azobenzene–cyclodextrin host-guest association. In the reported system, near-infrared irradiation is converted by upconversion nanoparticles into UV emission that induces azobenzene photoisomerization and controlled siRNA release.

Bacterial degraders are a proposed construct pattern for targeted protein degradation in bacteria. They are discussed as tools to interrogate protein function and as potential antimicrobial modalities.

Bacterial degrons are proteolysis-targeting signals that are appended to proteins to direct their degradation in bacterial cells. They are described as tools to interrogate and control protein function through targeted protein depletion.

Bacteriophage-derived peptides are peptide inhibitors reported to allosterically inhibit CRISPR-Cas9. Based on the supplied evidence, they act as anti-CRISPR-like modulators of Cas9 activity in genome editing contexts.

Bcl-2 antisense oligonucleotides are therapeutic oligonucleotide payloads incorporated into a near-infrared light-controlled DNA nanodevice for imaging-guided gene silencing. In the reported system, survivin mRNA recognition activates amplified release of Bcl-2 ASOs through an intramolecular DNA walking circuit.

The bicistronic expression cassette with GFP is a construct pattern used in Caenorhabditis elegans to co-express GFP as a reporter alongside conditional Channelrhodopsin-2 targeting components. In the cited study, GFP was included to identify the correct expression pattern during recombinase-based, intersectional single-neuron targeting.

The bidirectional promoter system is an engineered EL222-based optogenetic construct pattern for Escherichia coli that enables blue light-mediated transcriptional activation and repression from a bidirectional promoter architecture. It uses the blue light-dependent DNA-binding protein EL222 to provide rapid and reversible control of gene expression.

Biomimicry is identified in a 2022 review as an emerging engineering strategy expected to influence future directions in the field. The available evidence does not define a specific biological construct, molecular implementation, or demonstrated functional output.

Biomolecular liquid-liquid phase separation (LLPS) is a cellular organizational phenomenon in which biomolecules demix into condensed phases. The cited review describes LLPS as contributing to cellular homeostasis and specifically to cellular redox maintenance, including redox imbalance sensing, signal transduction, and transcriptional regulation.

Blue light-activatable DNA parts are synthetic DNA constructs that enable blue-light-dependent control of cell-free RNA and protein synthesis. In the reported system, they operate orthogonally to ultraviolet light-activated DNA and were used to implement dual-wavelength logic control.

The blue light-regulated synthetic genetic circuit for CheZ-controlled motility is a synthetic construct pattern developed in programmed Escherichia coli to control bacterial directional motility with blue light. In the cited study, blue light-regulated control of CheZ expression enabled movement away from blue light, consistent with negative phototaxis, and supported aggregation and pattern formation.

Blue-light controlled gene modules are optogenetic expression constructs used with a portable smart blue-light controlled device to regulate local cytokine expression in the tumor microenvironment. In the cited 2024 MED study, this strategy was associated with enhanced activation of tumor-infiltrating immune cells and remodeling of an immunosuppressive tumor milieu.

The blue-light-activated DNA template ON switch is a light-responsive DNA construct that enables transcription to be initiated by blue light. In the reported combined system, it was used with a separate light-controlled OFF switch to start transcription with one wavelength and later halt translation of the corresponding mRNA-to-protein output with a different wavelength.

BMP-2_pc is a recombinant BMP-2 construct linked through a coumarin-based 405 nm-photocleavable linker and covalently incorporated into an enzymatically crosslinked collagen-containing hydrogel composite. Blue-light stimulation triggers stepwise release of BMP-2 from the material.

The Boolean logic gate is a construct pattern incorporated into a photoactivatable CRISPR/Cas9-inducible DNAzyme probe. In the reported system, it contributed to superior spatiotemporal control for dynamic imaging of nuclear Zn2+ in HeLa cells and mice.

Booster is a red-shifted genetically encoded FRET biosensor backbone generated by optimizing the order of fluorescent proteins and modulatory domains within a biosensor architecture. In the reported implementation, a Booster-PKA sensor enabled kinase activity readout in a spectral window compatible with CFP/YFP-based FRET biosensors and blue light-responsive optogenetic tools.

Booster-PKA is a genetically encoded protein kinase A activity biosensor built on the red-shifted Booster Förster resonance energy transfer (FRET) backbone. It reports PKA signaling with performance comparable to AKAR3EV and can be used simultaneously with a CFP/YFP-based ERK FRET biosensor.

CaRTRIDGE is a mammalian synthetic biology framework that repurposes CRISPR-associated proteins as translational modulators. In this system, Cas proteins repress or activate translation of mRNAs carrying a cognate Cas-binding RNA motif in the 5′ untranslated region, and the platform can be combined with other Cas-based regulatory layers.

CFP-YFP FRET biosensors are genetically encoded visible-range reporter constructs used in the cited study to measure RhoA activity and Rac1-GDI binding. In that work, they were combined with a near-infrared Rac1 biosensor to enable parallel imaging of Rho GTPase signaling during optogenetic manipulation of Rac1.

Chimeric trace-amine-associated receptor 1 (cTAAR1) is a synthetic rewired receptor module that converts guanabenz input into cAMP/PKA-dependent CREB1 activation and transcription from promoters containing CREB1-specific cAMP response elements. In the reported designer circuit, this control system regulated expression of a GLP-1-Fc(mIgG)-Leptin payload.

ChR024 is a red-shifted cation-conducting channelrhodopsin that functions as a light-gated ion channel. Structural and electrophysiological analyses place it within a pump-fold channelrhodopsin architecture while supporting passive cation conductance and color tuning.

ChRmine is only mentioned in the supplied evidence as a comparator in the context of pump-fold channelrhodopsin structural analysis. The provided source does not directly describe ChRmine’s sequence, engineering, or functional performance.

Chronos is a channelrhodopsin construct used for optical excitation of neurons. In the cited 2014 Nature Methods work, it is presented with Chrimson as a complementary optogenetic pair for two-color activation of distinct neural populations, enabling independent spiking and downstream synaptic transmission in mouse brain slice without detectable cross-talk.

CIB1-targeting decoy peptides are computationally modeled peptide variants intended to bind calcium and integrin-binding protein 1 (CIB1) and inhibit its function. A 2023 in silico study reported that top-ranked second-generation mutant peptides had greater predicted inhibitory potential than the reference peptide UNC10245092.

Click-labelling in this context is a Bacillus subtilis genetic code expansion platform that incorporates noncanonical amino acids for click-chemistry-based protein labelling. In the cited 2021 study, it was implemented within broad and efficient stop-codon suppression systems and used alongside photo-crosslinking and translational titration applications.

Closed-loop gene networks are synthetic mammalian gene circuit architectures assembled from gene switches in engineered cells. Reported functions of these complex circuits include event memory, oscillatory protein production, and information-processing behaviors, and microencapsulated mammalian cells carrying such networks have been implanted into mice.

Closed-loop molecular and cellular circuits are semi- and fully synthetic regulatory circuit architectures described in plants. They are assembled from genetic parts to build open- and closed-loop control systems intended to regulate biological processes such as signaling and recombination.

Complex CRISPR-based circuits are higher-order assemblies of CRISPR-based genetic switches. Reported functions include inducible switching behavior, non-linear regulatory responses, and logical biocomputation.

Complex genetic networks are synthetic biology construct patterns assembled from interchangeable, standardized bio-parts into sensing, information processing, and effector modules. They are described as integrated gene network architectures for input-responsive control of downstream functions.

The constitutively nuclear, chromatin-anchored LEXY variant is a light-responsive construct variant derived from the LEXY nuclear export control platform. It was reported to inhibit endogenous protein export by sequestering cellular CRM1 receptors in the nucleus, extending LEXY beyond control of tagged cargo export.

Cr_ChR2 is a light-gated cation channel from Chlamydomonas reinhardtii used in optogenetics to activate neuronal excitability. The supplied evidence describes it as the first and most widely applied channelrhodopsin and as a benchmark comparator for newer light-gated cation channels such as Gt_CCR4.

CRISPR-based biosensors are molecular diagnostic constructs that use CRISPR systems for sequence-specific nucleic acid recognition to detect disease-associated targets. A 2023 review presents them as a strategy for detecting emerging infectious diseases.

Thermo-modulated CRISPR-Cas genome editors are engineered CRISPR-Cas constructs in mammalian systems whose genome-editing activity is directly modulated by subtle temperature changes within the physiological range. The reported work describes these as the first CRISPR-Cas genome editors with direct temperature responsiveness.

CRISPR-Cas technology comprises CRISPR-associated effector proteins that recognize specific DNA or RNA sequences and cleave them. In the cited review, it is presented primarily as a platform for rapid pathogen nucleic acid detection that leverages Cas trans-cleavage activity together with signal amplification and signal transformation strategies.

CRISPR-plus is a light-activated CRISPR/Cas9 strategy in which guide RNA activity is suppressed by photocleavable protectors and restored by illumination. It enables optical control of genome editing and was reported to be compatible with simultaneous targeting of multiple DNA sequences.