Toolkit Items

Affinity-based purification of caged DNA is a preparation method for caged linear double-stranded DNA in which a minimal protein-expression cassette is reacted with Bio-Bhc-diazo and the caged DNA is isolated by affinity separation. The reported application context is light-controlled gene expression in mammalian cells.

Automated optogenetic feedback control is an engineering method that combines light-driven optogenetic regulation with a feedback loop to control gene expression and cell growth. The available evidence supports it as a control framework for precise and robust regulation rather than as a single molecular reagent.

Base editors are identified in the supplied evidence as a bacterial genome-editing tool category discussed alongside CRISPR nickases and Cas12a. The evidence establishes their inclusion within genome-editing approaches in bacteria but does not describe their molecular composition or specific editing outcomes.

This engineering method defines basic operations as sets of light patterns that create, move, and merge microtubule structures. By composing these optical operations, it organizes contractile microtubule networks and associated active-matter behaviors.

Bio-Bhc-diazo caging reaction is a chemical method for preparing caged linear double-stranded DNA by reacting linear dsDNA containing a minimal protein-expression sequence with Bio-Bhc-diazo. The resulting caged DNA was developed for light-controlled gene expression in mammalian cells.

Bioengineering is described in a 2021 review as a methodological strategy for β-cell regeneration that aims to transdifferentiate other cell types into β-cells. The available evidence frames it as an engineering approach rather than a single defined molecular tool.

Blue LED light exposure is a process-level illumination method applied to IgG1-producing Chinese hamster ovary cells that increases cell-specific productivity without additional optogenetic engineering. In the cited 2024 study, this productivity increase was observed under blue LED illumination and was associated with altered growth and cell-cycle distribution.

The caging strategy for crRNA is a photoregulated CRISPR/Cas9 control method in which vitamin E is coupled to the 5' terminus of crRNA through a photolabile linker. In the caged state, the modified crRNA is reported to suppress target DNA association while preserving Cas9/crRNA/tracrRNA ribonucleoprotein assembly, and light irradiation restores genome-editing activity.

Cas12a is identified in the supplied source as a CRISPR-based genome-editing method discussed alongside CRISPR nickases and base editors. The evidence places Cas12a within the context of bacterial genome editing, but does not provide tool-specific functional or mechanistic detail.

Cas9BOC is a genetically encoded Cas9 variant engineered by genetic code expansion to require the non-physiological amino acid Lys(Boc) for full-length active expression. It provides acute chemical control over Cas9-mediated mammalian genome editing, including heritable editing in mouse embryos.

Catalytically dead Cas9 (dCas9) is an inactive CRISPR-associated protein 9 variant used for CRISPR-based modulation of gene expression rather than nuclease-mediated editing. The supplied review evidence describes dCas9-based CRISPR systems as reliable and specific for altering gene expression.

Central carbon metabolism (CCM) pathway modification is a classical metabolic engineering strategy discussed for shikimate-pathway engineering in microorganisms. It is used within rational pathway modification approaches in recombinant strains to influence accumulation of shikimic acid and branched target products.

Chemogenetic methods of transmembrane receptors are a set of approaches for cell-specific regulation of receptor signaling. A 2022 review describes them as methods to control receptor functions in cells, with some strategies applied in living animals to reveal signaling in target cells.

Chemogenetically driven repositioning of lysosomes is an experimental perturbation used to causally alter lysosome localization and test how lysosome positioning regulates endoplasmic reticulum remodeling. In the cited 2020 Science Advances study, chemo- and optogenetically driven lysosome repositioning was used to validate a causal link between lysosome movement and ER network organization.

Chemogenetics is an engineering method in which target proteins are genetically engineered to interact with a designed chemical partner with high selectivity. It is used as a chemical-input strategy to manipulate protein or receptor function in cells and has also been used alongside optogenetics to perturb cellular structures such as specific microtubule subtypes.

Chimeragenesis is an engineering method used to generate additional channelrhodopsin variants. In the cited review, it is identified alongside mutagenesis and bioinformatic approaches as a route by which variants including ChD and ChEF were introduced.

CIB1 depletion by RNA interference is a gene-silencing method in which CIB1 is targeted by RNA interference. In triple-negative breast cancer cell lines, this perturbation was studied with docetaxel and was associated with enhanced tumor-specific cell death, TRAIL-R2 upregulation, and caspase-8-linked death receptor-mediated apoptosis.

Cib1(-/-) mice are a constitutive Mus musculus knockout line generated by homologous recombination in embryonic stem cells to disrupt the Cib1 gene. This in vivo genetic perturbation was used to define CIB1 function and revealed that CIB1 is essential for male spermatogenesis.

The circular permutation strategy is a protein re-engineering method applied to the AsLOV2 photosensory domain to generate circularly permuted AsLOV2 variants. In the cited 2021 study, this redesign enabled photoswitchable control of a peptide C-terminus and could be used alone or together with the original AsLOV2 for enhanced caging.

Clathrin endocytosis is a host-cell internalization pathway described in a review as one route used by Kaposi’s sarcoma-associated herpesvirus (KSHV) to enter fibroblast infection models. In this context, it serves as a cellular uptake mechanism associated with viral entry and subsequent trafficking events linked to host signaling pathways.

Clock gene expression refers to the expression dynamics of circadian clock genes considered within mammalian circadian entrainment. The cited review places these dynamics within endogenous biological oscillators that include a master clock in the hypothalamic suprachiasmatic nuclei.

Closed loop optogenetic compensation (CLOC) is an engineering methodology that monitors pathway output in real time and computes an optogenetically driven transcriptional input to compensate for deletion of a feedback regulator. It was applied to the Saccharomyces cerevisiae pheromone response pathway to define the dynamic requirements of feedback control.

Clustering Indirectly using Cryptochrome 2 (CLICR) is a genetically encoded optogenetic method for spatiotemporal control of endogenous transmembrane receptor activation. It uses engineered Arabidopsis Cry2 to regulate target receptor clustering through noncovalent interactions, thereby activating downstream signaling.

Co-opting natural allosteric coupling is a protein engineering method that converts proteins into conformational switches by leveraging pre-existing allosteric relationships. The cited literature describes its use to generate proteins that respond to signaling events and thereby enable biosensing or regulated biological function.

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.

Conditional gene mutation is a genetic engineering method for creating gene alterations that are activated in spatially restricted and/or temporally restricted ways. In mice, these conditional mutations enable controlled genetic perturbation for experimental studies and disease modeling.

CoTV is a multi-agent deep reinforcement learning system that cooperatively controls traffic light signals and connected autonomous vehicles in mixed-autonomy urban traffic scenarios. It was reported as a computational control method and evaluated in SUMO simulation.

CRISPR is a widely used engineering method for targeted RNA and DNA manipulation across multiple organisms. The cited review highlights its use for viral genome manipulation, including gene knock-in and gene knock-out, and for precise diagnosis of viral infections.

CRISPR activation and interference (CRISPRa/CRISPRi) is a CRISPR-based gene regulation method that uses Nab2- or Egr3-targeted single-guide RNAs to modulate transcription. In the cited 2022 study, these tools were used in Neuro2a cells to mimic bidirectional cocaine-associated expression changes in Nab2 and Egr3.

CRISPR nickases are identified in a 2021 review as one of the CRISPR-Cas-based approaches discussed for bacterial genome editing. The supplied evidence does not provide tool-specific mechanistic, performance, or implementation detail beyond their inclusion in that method set.

CRISPR-associated transposases are identified in the cited review as a bacterial genome-editing method category within the broader landscape of CRISPR-Cas and related approaches. The supplied evidence establishes only their inclusion as an editing approach and does not provide mechanistic or performance detail.

CRISPR-Cas-mediated genome editing is a programmable genome-editing approach discussed here in the context of bacterial systems. The cited review summarizes the main approaches for bacterial CRISPR-Cas editing and the difficulties associated with applying these systems in bacteria.

CRISPR/Cas9 is a genome editing technique used in the cited study to generate Cib1 and Cib2 knockout mice. In this evidence set, its demonstrated function is targeted gene disruption for mouse model production.

CRISPR/Cas9 mediated genome editing is a genome engineering method used in the cited 2016 Scientific Reports study to investigate the functional role of human Interleukin-8 gene haplotypes. The supplied evidence supports its application in editing a specific human gene-haplotype context.

CRISPR-DNAzyme is a three-stranded DNAzyme probe engineered for in situ imaging of nuclear Zn2+ in living cells. Its catalytic activity is initially blocked by a 20-bp CRISPR/Cas9 recognition site and is activated in the nucleus after Cas9/sgRNA cleavage forms the active DNAzyme structure.

CRISPRoff is an engineering method for light-induced degradation of single-guide RNA (sgRNA) that inactivates the CRISPR ribonucleoprotein. It enables spatiotemporal attenuation of CRISPR-Cas9 genome editing in cells through selective illumination.

Cu-catalyzed azide-alkyne cycloaddition (CuAAC) is a click-chemistry method used to cyclize RNA through covalent intramolecular ligation. In a 2024 study on cyclic photocleavable RNA for a photoactivatable CRISPR/Cas9 system, CuAAC was tested alongside thiol-maleimide Michael reaction and was reported to have advantages for cyclic RNA preparation.

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.

Cytokines are mentioned in a 2021 review as one of several strategies considered for β-cell regeneration. The supplied evidence indicates their inclusion in regeneration and reprogramming approaches, but does not identify specific cytokines, molecular targets, or validated engineering implementations.

Deep brain stimulation (DBS) is an established neuromodulation method used as an add-on treatment for severe Parkinson's disease and other chronic neurological conditions. In the cited review, DBS is presented primarily as the clinical benchmark for comparison with optogenetic neuromodulation.

Directed evolution is an engineering method that improves biological tool performance by iteratively selecting functional protein variants. In the cited split fluorescent protein study, it was demonstrated as one of two approaches used to improve split fluorescent proteins, contributing to brighter split sfCherry3 variants.

DNA synthesis is presented as an engineering method that supports the development of new dynamic metabolic engineering systems. In the cited review, advances in DNA synthesis are identified as a factor that will continue to drive innovation in responsive cell factory design.

Domain fusion is a protein engineering method in which protein domains are fused or split to improve existing protein functions or create novel functions. In the supplied evidence, it is described as a general strategy for expanding CRISPR-Cas9 applications.

Domain insertion permissibility is an experimental engineering paradigm established in the human inward rectifier K+ channel Kir2.1 to identify engineerable allosteric sites. In this framework, sites permissive to insertion of regulatory domains can be converted into functional control points, including light-sensitive regulation when light-switchable domains are inserted.

Double resonance excitation is a sequential light-excitation method that combines vibrational and electronic molecular transitions in a single process. In the cited 2022 study, it is implemented using non-resonant stimulated Raman pre-excitation followed by electronic excitation to add chemical selectivity and promote molecules to chemically active energy levels.

Duplex CRISPR/Cas9 technology is a genome-editing method that uses two guide RNAs to target intronic sequences flanking an exon, enabling excision of the intervening exon by Cas9-mediated cleavage. In human U-2 OS osteosarcoma cells, it was applied to generate CRY1 knockout, CRY2 knockout, and CRY1/CRY2 double knockout cell models.

Dynamic metabolic engineering is an engineering strategy that uses dynamic regulation of gene expression to build responsive cell factories. It is described as enabling metabolic flux rebalancing under changing cellular or fermentation conditions while managing trade-offs between growth and production.

Dynamic regulation is a metabolic engineering method that modulates gene expression over time to rebalance metabolic fluxes in response to changing cellular or fermentation conditions. It is used to build responsive cell factories rather than relying on fixed static control.

Engineered immune cells in this evidence context are immune cells rapidly modified using CRISPR-Cas9 for cancer immunotherapeutic applications. The supplied evidence supports CRISPR-Cas9-based generation of such cells but does not identify specific immune cell types, edited loci, or therapeutic payloads.