Source 1primary paper2026MED
Toolkit/ChReef
ChReef
Taxonomy: Mechanism Branch / Architecture. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
Here we report ChReef, an improved variant of the channelrhodopsin ChRmine.
Usefulness & Problems
Why this is useful
ChReef is an improved ChRmine-derived optogenetic actuator reported to enable reliable control of excitable cells at low light levels with sustained responses and temporal fidelity. The abstract presents applications in cardiac pacing, vision restoration, and auditory pathway stimulation.; low-light optogenetic control; sustained stimulation with temporal fidelity; cardiac pacing and depolarization block; vision restoration via retinal ganglion cell expression; auditory pathway stimulation for optical cochlear implant applications
Source:
ChReef is an improved ChRmine-derived optogenetic actuator reported to enable reliable control of excitable cells at low light levels with sustained responses and temporal fidelity. The abstract presents applications in cardiac pacing, vision restoration, and auditory pathway stimulation.
Source:
low-light optogenetic control
Source:
sustained stimulation with temporal fidelity
Source:
cardiac pacing and depolarization block
Source:
vision restoration via retinal ganglion cell expression
Source:
auditory pathway stimulation for optical cochlear implant applications
Problem solved
The paper positions ChReef as addressing the need for efficient, sustained optogenetic control with low-light sensitivity across multiple organ systems. Its reduced desensitization and favorable kinetics are presented as enabling this.; improves sustained and reliable optogenetic control at low light levels; supports efficient stimulation across sensory and cardiac systems
Source:
The paper positions ChReef as addressing the need for efficient, sustained optogenetic control with low-light sensitivity across multiple organ systems. Its reduced desensitization and favorable kinetics are presented as enabling this.
Source:
improves sustained and reliable optogenetic control at low light levels
Source:
supports efficient stimulation across sensory and cardiac systems
Problem links
improves sustained and reliable optogenetic control at low light levels
LiteratureThe paper positions ChReef as addressing the need for efficient, sustained optogenetic control with low-light sensitivity across multiple organ systems. Its reduced desensitization and favorable kinetics are presented as enabling this.
Source:
The paper positions ChReef as addressing the need for efficient, sustained optogenetic control with low-light sensitivity across multiple organ systems. Its reduced desensitization and favorable kinetics are presented as enabling this.
supports efficient stimulation across sensory and cardiac systems
LiteratureThe paper positions ChReef as addressing the need for efficient, sustained optogenetic control with low-light sensitivity across multiple organ systems. Its reduced desensitization and favorable kinetics are presented as enabling this.
Source:
The paper positions ChReef as addressing the need for efficient, sustained optogenetic control with low-light sensitivity across multiple organ systems. Its reduced desensitization and favorable kinetics are presented as enabling this.
Published Workflows
Objective: Engineer and demonstrate an improved channelrhodopsin for efficient, sustained, low-light optogenetic control across cardiac, visual, and auditory systems in vivo.
Why it works: The abstract links ChReef's reduced desensitization, 80 fS conductance, and 30 ms closing kinetics to reliable control at low light levels with good temporal fidelity and sustained stimulation, then demonstrates these properties in multiple application settings.
light-gated depolarization of excitable cellssustained photocurrent with reduced desensitizationfast channel closing to support temporal precisionprotein variant engineeringAAV-based gene transferapplication testing across cardiac and sensory systems
Taxonomy & Function
Primary hierarchy
Mechanism Branch
Architecture: A reusable architecture pattern for arranging parts into an engineered system.
Target processes
recombinationselectionInput: Light
Implementation Constraints
cofactor dependency: requires exogenous cofactorencoding mode: genetically encodedimplementation constraint: context specific validationimplementation constraint: payload burdenimplementation constraint: spectral hardware requirementoperating role: sensor
The reported in vivo use cases require expression of ChReef in target cells, including AAV-based gene transfer to retinal ganglion cells. The auditory application context also involves LED-based optical cochlear implants.; requires gene delivery for expression in target cells; application examples in the abstract use adeno-associated-virus-based gene transfer; hearing application context uses LED-based optical cochlear implants
Requires extra cofactor or chromophore handling. Needs compatible illumination hardware and optical access. Independent follow-up evidence is still limited. Validation breadth across biological contexts is still narrow. Independent reuse still looks limited, so the evidence base may be fragile. It may depend on an exogenous cofactor or chromophore supply step. No canonical validation observations are stored yet, so context-specific performance remains under-specified.
Validation
Cell-freeBacteriaMammalianMouseHumanTherapeuticIndep. Replication
Supporting Sources
Ranked Claims
AAV-based expression of ChReef in retinal ganglion cells restores visual function in blind mice with light sources as weak as an iPad screen.
We used adeno-associated-virus-based gene transfer to express ChReef in retinal ganglion cells, where it restores visual function in blind mice with light sources as weak as an iPad screen.
light source threshold description as weak as an iPad screen
ChReef enables efficient and reliable red-light pacing and depolarization block in ChReef-expressing cardiomyocyte clusters.
We demonstrate efficient and reliable red-light pacing and depolarization block of ChReef-expressing cardiomyocyte clusters.
ChReef enables stimulation of the auditory pathway in rodents and non-human primates with nanojoule thresholds, supporting efficient and frequency-specific stimulation by LED-based optical cochlear implants.
Toward optogenetic hearing restoration, ChReef enables stimulation of the auditory pathway in rodents and non-human primates with nanojoule thresholds, enabling efficient and frequency-specific stimulation by LED-based optical cochlear implants.
stimulation threshold nanojoule thresholds
ChReef has minimal photocurrent desensitization, unitary conductance of 80 fS, and closing kinetics of 30 ms, enabling reliable low-light optogenetic control with temporal fidelity and sustained stimulation.
ChReef offers minimal photocurrent desensitization, a unitary conductance of 80 fS and closing kinetics of 30 ms, which together enable reliable optogenetic control of cells at low light levels with good temporal fidelity and sustained stimulation.
closing kinetics 30 msunitary conductance 80 fS
ChReef is an improved variant of the channelrhodopsin ChRmine.
Here we report ChReef, an improved variant of the channelrhodopsin ChRmine.
Approval Evidence
1 source5 linked approval claimsfirst-pass slug chreef
Here we report ChReef, an improved variant of the channelrhodopsin ChRmine.
Source:
application performancesupports
AAV-based expression of ChReef in retinal ganglion cells restores visual function in blind mice with light sources as weak as an iPad screen.
We used adeno-associated-virus-based gene transfer to express ChReef in retinal ganglion cells, where it restores visual function in blind mice with light sources as weak as an iPad screen.
Source:
application performancesupports
ChReef enables efficient and reliable red-light pacing and depolarization block in ChReef-expressing cardiomyocyte clusters.
We demonstrate efficient and reliable red-light pacing and depolarization block of ChReef-expressing cardiomyocyte clusters.
Source:
application performancesupports
ChReef enables stimulation of the auditory pathway in rodents and non-human primates with nanojoule thresholds, supporting efficient and frequency-specific stimulation by LED-based optical cochlear implants.
Toward optogenetic hearing restoration, ChReef enables stimulation of the auditory pathway in rodents and non-human primates with nanojoule thresholds, enabling efficient and frequency-specific stimulation by LED-based optical cochlear implants.
Source:
biophysical propertysupports
ChReef has minimal photocurrent desensitization, unitary conductance of 80 fS, and closing kinetics of 30 ms, enabling reliable low-light optogenetic control with temporal fidelity and sustained stimulation.
ChReef offers minimal photocurrent desensitization, a unitary conductance of 80 fS and closing kinetics of 30 ms, which together enable reliable optogenetic control of cells at low light levels with good temporal fidelity and sustained stimulation.
Source:
tool improvementsupports
ChReef is an improved variant of the channelrhodopsin ChRmine.
Here we report ChReef, an improved variant of the channelrhodopsin ChRmine.
Source:
Comparisons
Source-stated alternatives
The abstract identifies ChRmine as the parent channelrhodopsin from which ChReef was improved.
Source:
The abstract identifies ChRmine as the parent channelrhodopsin from which ChReef was improved.
Source-backed strengths
minimal photocurrent desensitization; unitary conductance of 80 fS; closing kinetics of 30 ms; works at low light levels; supports sustained stimulation with good temporal fidelity
Source:
minimal photocurrent desensitization
Source:
unitary conductance of 80 fS
Source:
closing kinetics of 30 ms
Source:
works at low light levels
Source:
supports sustained stimulation with good temporal fidelity
Compared with CfRhPDE1
ChReef and CfRhPDE1 address a similar problem space because they share recombination, selection.
Shared frame: same top-level item type; shared target processes: recombination, selection; same primary input modality: light
Relative tradeoffs: looks easier to implement in practice; may avoid an exogenous cofactor requirement.
Compared with CheRiff
ChReef and CheRiff address a similar problem space because they share recombination, selection.
Shared frame: same top-level item type; shared target processes: recombination, selection; same primary input modality: light
Relative tradeoffs: looks easier to implement in practice; may avoid an exogenous cofactor requirement.
Compared with luciferin-luciferase pair
ChReef and luciferin-luciferase pair address a similar problem space because they share recombination, selection.
Shared frame: same top-level item type; shared target processes: recombination, selection; same primary input modality: light
Relative tradeoffs: looks easier to implement in practice; may avoid an exogenous cofactor requirement.
Ranked Citations
- 1.