Source 1primary paper2025MED
Toolkit/STAR
STAR
Also known as: small toxin- and dEcCas6-CBS-based RNA degraders
Taxonomy: Mechanism Branch / Architecture. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
create hypercompact transcript degraders (317 ~ 430 amino acids), named STAR (small toxin- and dEcCas6-CBS-based RNA degraders)
Usefulness & Problems
No literature-backed usefulness or problem-fit explainer has been materialized for this record yet.
Published Workflows
Objective: Engineer a hypercompact programmable RNA degrader that preserves efficient transcript knockdown while improving delivery compatibility and reducing off-target activity.
Why it works: The workflow combines small toxin RNases with a dEcCas6-CBS recruitment system so that compact components can be assembled into a programmable RNA degrader. The abstract states that CBS can be tuned for processing while retaining conserved binding, which supports guide-based recruitment of dEcCas6-toxins.
substrate-specific toxin endoribonuclease cleavagedEcCas6 recruitment to CBS-containing guide architectureCBS-mediated targeting and recruitmentexcavation and evolution of small toxin endoribonucleasesintegration of dEcCas6 with CBS guide designexperimental tuning of CBS processing and binding
Stages
- 1.Excavation and evolution of small toxin endoribonucleases(library_design)
This stage provides small catalytic modules intended to support miniature RNA degrader design.
Selection: Identify and engineer small toxin endoribonucleases with simple RNA cleavage motifs for use as compact degradative modules.
- 2.Integration of toxin modules with dEcCas6-CBS architecture(library_build)
This stage creates the STAR architecture by combining catalytic toxin modules with a recruitable RNA-targeting module.
Selection: Assemble engineered toxin modules with catalytically dead EcCas6 and CBS to create hypercompact transcript degraders.
- 3.CBS tuning for processing and binding(functional_characterization)
The abstract states that CBS tuning lays the foundation for designing guides that effectively recruit dEcCas6-toxins.
Selection: Optimize CBS for EcCas6 processing while maintaining EcCas6 and dEcCas6 binding needed for recruitment.
- 4.Mammalian-cell performance evaluation(confirmatory_validation)
This stage confirms that the compact degrader functions on cytoplasmic and nuclear transcripts in mammalian cells and compares favorably on off-target activity.
Selection: Assess transcript knockdown efficiency and off-target activity in tested mammalian cells.
- 5.Single-AAV and disease-relevant application validation(confirmatory_validation)
This stage validates the delivery advantage conferred by compact size and demonstrates application to MYC silencing in human cancer cells.
Selection: Demonstrate that compact size supports single-AAV delivery and multiplex RNA knockdown in a disease-relevant mammalian context.
Taxonomy & Function
Primary hierarchy
Mechanism Branch
Architecture: A composed arrangement of multiple parts that instantiates one or more mechanisms.
Mechanisms
Degradationendoribonuclease-mediated transcript cleavagerna-guided recruitment via deccas6-cbs bindingtargeted rna degradationTechniques
No technique tags yet.
Target processes
degradationeditingrecombinationValidation
Cell-freeBacteriaMammalianMouseHumanTherapeuticIndep. Replication
Observations
successMammalian Cell Lineapplication demohuman cancer cells
Inferred from claim claim6 during normalization. STAR can effectively silence the oncogenic RNA MYC in human cancer cells. Derived from claim claim6. Quoted text: including effective silencing of the oncogenic RNA MYC in human cancer cells
Source:
Supporting Sources
Ranked Claims
STAR can effectively silence the oncogenic RNA MYC in human cancer cells.
including effective silencing of the oncogenic RNA MYC in human cancer cells
The small size of STAR enables delivery via a single AAV and facilitates multiplex RNA knockdown.
the small size of STAR enables delivery via a single adeno-associated virus (AAV) for ease of multiplex RNA knockdown
CBS can be fine-tuned for EcCas6 processing while maintaining conserved binding to EcCas6 and dEcCas6, supporting CBS guide design for recruitment of dEcCas6-toxins.
CBS can be fine-tuned for EcCas6 processing but exhibits high conservatism in EcCas6 and dEcCas6 binding, laying a foundation for the design of CBS guides to effectively recruit dEcCas6-toxins
STAR mediates high-efficiency knockdown of both cytoplasmic and nuclear transcripts in tested mammalian cells.
STAR exhibits high-efficiency knockdown of both cytoplasmic and nuclear transcripts in the tested mammalian cells
STAR has significantly reduced off-target activities compared with established CRISPR and RNA interference technologies.
with significantly reduced off-target activities compared to established CRISPR and RNA interference (RNAi) technologies
STAR is a hypercompact transcript degrader created by integrating engineered small toxin endoribonucleases with dEcCas6 and a CBS RNA element.
integrate catalytically dead Cas6 (dCas6) along with its cognate stem-loop RNA (Cas6 binding site, termed CBS) from Escherichia coli (E. coli) to create hypercompact transcript degraders (317 ~ 430 amino acids), named STAR
protein size range 317~430 amino acids
Approval Evidence
1 source5 linked approval claimsfirst-pass slug star
create hypercompact transcript degraders (317 ~ 430 amino acids), named STAR (small toxin- and dEcCas6-CBS-based RNA degraders)
Source:
applicationsupports
STAR can effectively silence the oncogenic RNA MYC in human cancer cells.
including effective silencing of the oncogenic RNA MYC in human cancer cells
Source:
delivery compatibilitysupports
The small size of STAR enables delivery via a single AAV and facilitates multiplex RNA knockdown.
the small size of STAR enables delivery via a single adeno-associated virus (AAV) for ease of multiplex RNA knockdown
Source:
performancesupports
STAR mediates high-efficiency knockdown of both cytoplasmic and nuclear transcripts in tested mammalian cells.
STAR exhibits high-efficiency knockdown of both cytoplasmic and nuclear transcripts in the tested mammalian cells
Source:
specificitysupports
STAR has significantly reduced off-target activities compared with established CRISPR and RNA interference technologies.
with significantly reduced off-target activities compared to established CRISPR and RNA interference (RNAi) technologies
Source:
tool constructionsupports
STAR is a hypercompact transcript degrader created by integrating engineered small toxin endoribonucleases with dEcCas6 and a CBS RNA element.
integrate catalytically dead Cas6 (dCas6) along with its cognate stem-loop RNA (Cas6 binding site, termed CBS) from Escherichia coli (E. coli) to create hypercompact transcript degraders (317 ~ 430 amino acids), named STAR
Source:
Comparisons
No literature-backed comparison notes have been materialized for this record yet.
Ranked Citations
- 1.