Source 1primary paper2025MED
Toolkit/acoustic reporter genes
acoustic reporter genes
Also known as: ARGs
Taxonomy: Mechanism Branch / Architecture. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
Acoustic reporter genes (ARGs) have enabled imaging of gene expression with ultrasound.
Usefulness & Problems
Why this is useful
ARGs are genetically encoded reporters that enable ultrasound imaging of gene expression. In this paper, the platform is extended toward multiplexed readout.; ultrasound imaging of gene expression; imaging in deep, optically opaque living tissues; Acoustic reporter genes are described as tools for ultrasound imaging of biomolecular function. They represent a genetically encoded route to ultrasound-readable signals.; ultrasound imaging of biomolecular function; Acoustic reporter genes are described as tools for ultrasound imaging of biomolecular function.
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ARGs are genetically encoded reporters that enable ultrasound imaging of gene expression. In this paper, the platform is extended toward multiplexed readout.
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ultrasound imaging of gene expression
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imaging in deep, optically opaque living tissues
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Acoustic reporter genes are described as tools for ultrasound imaging of biomolecular function. They represent a genetically encoded route to ultrasound-readable signals.
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ultrasound imaging of biomolecular function
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Acoustic reporter genes are described as tools for ultrasound imaging of biomolecular function.
Problem solved
They solve the problem of visualizing gene expression in deep, optically opaque tissues where optical reporters are limited.; provides genetically encoded ultrasound readout of gene expression in tissues inaccessible to optical imaging; They address the need to monitor biomolecular function using ultrasound rather than light-based readouts. This is useful for deeper-tissue interrogation.; genetically encoding ultrasound-detectable biomolecular function readouts; They provide a genetically linked way to monitor biomolecular function with ultrasound.; enabling ultrasound-based reporting of biomolecular function
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They solve the problem of visualizing gene expression in deep, optically opaque tissues where optical reporters are limited.
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provides genetically encoded ultrasound readout of gene expression in tissues inaccessible to optical imaging
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They address the need to monitor biomolecular function using ultrasound rather than light-based readouts. This is useful for deeper-tissue interrogation.
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genetically encoding ultrasound-detectable biomolecular function readouts
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They provide a genetically linked way to monitor biomolecular function with ultrasound.
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enabling ultrasound-based reporting of biomolecular function
Problem links
enabling ultrasound-based reporting of biomolecular function
LiteratureThey provide a genetically linked way to monitor biomolecular function with ultrasound.
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They provide a genetically linked way to monitor biomolecular function with ultrasound.
genetically encoding ultrasound-detectable biomolecular function readouts
LiteratureThey address the need to monitor biomolecular function using ultrasound rather than light-based readouts. This is useful for deeper-tissue interrogation.
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They address the need to monitor biomolecular function using ultrasound rather than light-based readouts. This is useful for deeper-tissue interrogation.
provides genetically encoded ultrasound readout of gene expression in tissues inaccessible to optical imaging
LiteratureThey solve the problem of visualizing gene expression in deep, optically opaque tissues where optical reporters are limited.
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They solve the problem of visualizing gene expression in deep, optically opaque tissues where optical reporters are limited.
Published Workflows
Objective: Develop multiplexable acoustic reporter genes for two-tone ultrasound imaging of gene expression and demonstrate their use for distinguishing cell populations and states in vitro and in vivo.
Why it works: The workflow is presented as combining rational protein design and directed evolution to create reporter variants with distinct acoustic pressure-response profiles, which then enables two-tone ultrasound imaging.
acoustic discrimination based on pressure-response profilesrational protein designdirected evolutionultrasound imaging
Stages
- 1.Reporter engineering(library_design)
To overcome the single-sound limitation of prior ARGs by creating two distinguishable reporter variants.
Selection: Develop new ARG variants with distinguishable acoustic pressure-response profiles.
- 2.In vitro utility demonstration(functional_characterization)
To show that the engineered reporters are useful for distinguishing biological populations before in vivo application.
Selection: Assess whether multiplexed ARGs can delineate bacterial cell species and cell states in vitro.
- 3.In vivo application(in_vivo_validation)
To demonstrate that multiplexed ARG imaging works in relevant in vivo settings including the mouse gastrointestinal tract and tumor-colonizing bacterial agents.
Selection: Apply multiplexed ARGs to image distinct bacterial subpopulations in living mice.
Development of ultrasound-visualized tumor-targeting engineered bacteria for precise tumor therapy.
2025Objective: Engineer a tumor-targeting bacterial vector that is visible by deep-tissue ultrasound imaging while retaining capacity to carry therapeutic plasmids for precise tumor therapy.
Why it works: The abstract states that moving ARGs from plasmids to the genome is expected to improve in vivo expression stability and free plasmid space for drug-release components, while htrA knockout is associated with higher injectable dose and tumor specificity.
acoustic reporter gene expressiongas vesicle synthesis for ultrasound signal generationtumor-targeting bacterial colonizationCRISPR-Cas9 genome insertionpromoter strength optimizationcopy number optimizationhost gene knockout
Steps
- 1.Select VNP20009 as the tumor-targeting chassis
Use an attenuated bacterial chassis with known tumor-targeting ability as the starting platform.
The chassis choice defines the host for subsequent genome engineering and therapeutic vector development.
- 2.Insert ARGs into the genome using CRISPR-Cas9engineering method and engineered reporter architecture
Move ARGs from plasmids into the genome to support stable in vivo expression and preserve plasmid space.
Genome integration addresses the stated limitations of plasmid-based ARG testing before therapeutic payload carriage is considered.
- 3.Optimize promoter strength and copy number for ARG expressionengineered reporter architecture under optimization
Tune ARG expression to obtain ultrasound-visible bacteria expressing gas vesicles from the genome.
After genome insertion, expression tuning is needed to achieve functional reporter output.
- 4.Knock out htrA in VNP20009
Improve maximum injection dose and tumor specificity of the engineered bacterial vector.
Host performance optimization follows construction of the ultrasound-visible chassis to improve in vivo deployment properties.
- 5.Use the engineered bacteria as an ultrasound-visible therapeutic vector carrying drug plasmidstherapeutic delivery vector
Deploy the engineered bacteria for diagnosis and precise tumor treatment while carrying drug plasmids.
Therapeutic use depends on first establishing imaging visibility, stable reporter function, and improved deployment properties.
Objective: Engineer a hybrid gas-vesicle biosynthesis system that yields a clinically ultrasound-imageable gene-encoded nanostructure and supports particle-size tuning.
Why it works: The abstract presents the workflow rationale as combining structural genes from Serratia sp. ATCC 39006 with accessory genes from Bacillus megaterium to generate a new gas-vesicle nanostructure with dimensions compatible with clinical ultrasound imaging, and then using point saturation mutation to tune particle size.
hybridization of structural and accessory gas-vesicle gene clustersparticle-size tuning by point saturation mutationcombinatorial strategysynthetic biologypoint saturation mutation
Objective: Develop and test a harmonic imaging approach integrated with amplitude modulation to improve nondestructive detection sensitivity for gas vesicles in ultrasound imaging.
Why it works: The abstract states that harmonic imaging integrated with AM can elevate GV detection sensitivity by leveraging the nonlinear acoustic response of GVs.
leveraging the nonlinear acoustic response of gas vesiclesusing harmonic signals to isolate gas vesicle signaturesharmonic imagingamplitude modulationcomparison against traditional xAMspectral analysis of backscattered signals
Stages
- 1.Cell-free phantom testing with purified gas vesicles(functional_characterization)
The abstract presents phantom imaging with purified GVs as an initial test context for the harmonic imaging hypothesis before cellular and in vivo validation.
Selection: Assess harmonic imaging performance on purified GVs in tissue-mimicking phantoms.
- 2.Imaging of mammalian cells expressing gas vesicles(confirmatory_validation)
The abstract explicitly includes mammalian cells genetically modified to express GVs as a validation context for the method.
Selection: Test whether HxAM improves detection of GV-producing mammalian cells in vitro.
- 3.In vivo mouse liver imaging after systemic gas vesicle infusion(in_vivo_validation)
The abstract uses mouse liver imaging in vivo to test whether the method improves GV detection in intact organisms after systemic delivery.
Selection: Evaluate in vivo imaging performance and depth after systemic infusion of GVs.
- 4.Backscattered spectral investigation(secondary_characterization)
The abstract states that investigation into the backscattered spectra further elucidates the advantages of harmonic imaging.
Selection: Investigate backscattered spectra to elucidate the advantages of harmonic imaging.
Taxonomy & Function
Primary hierarchy
Mechanism Branch
Architecture: A reusable architecture pattern for arranging parts into an engineered system.
Mechanisms
acoustic pressure-response differentiation for multiplexed imagingultrasound contrast generation by gas vesiclesTechniques
No technique tags yet.
Target processes
No target processes tagged yet.
Implementation Constraints
cofactor dependency: cofactor requirement unknownencoding mode: genetically encodedimplementation constraint: context specific validationoperating role: sensor
The abstract indicates that ARGs require ultrasound imaging to read out gene expression signals in living tissues.; requires ultrasound-based readout; They require genetic engineering of the target system and ultrasound-based readout. The abstract does not specify exact gene clusters, host systems, or imaging sequences.; requires genetic encoding or expression in the target system; requires ultrasound imaging instrumentation; Their use depends on ultrasound-based imaging methods.; requires ultrasound imaging setup
Earlier ARG implementations did not solve multiplexed imaging because they were limited to a single acoustic signature.; prior ARGs were limited to a single 'sound', preventing multiplexed imaging of cellular states or populations; The abstract does not establish that acoustic reporter genes directly mediate ultrasound-triggered control of function. It also does not provide detailed limitations or benchmark data.
Validation
Cell-freeBacteriaMammalianMouseHumanTherapeuticIndep. Replication
Supporting Sources
Source 2review2024Angewandte Chemie International Edition
Ranked Claims
Multiplexed acoustic reporter genes were used to delineate bacterial cell species and cell states in vitro and to image distinct subpopulations of probiotics in the mouse gastrointestinal tract and tumor-colonizing bacterial agents in vivo.
Acoustic reporter genes enable ultrasound imaging of gene expression with high-resolution access to deep, optically opaque living tissues.
Rational protein design and directed evolution produced two new acoustic reporter genes distinguishable by acoustic pressure-response profiles, enabling two-tone ultrasound imaging of gene expression.
Prior acoustic reporter genes were limited to a single acoustic signature, preventing multiplexed imaging of cellular states or populations.
Gas vesicles and acoustic reporter genes are used for ultrasound imaging of biomolecular function.
Furthermore, we delve into the realm of ultrasound imaging of biomolecular function, encompassing the utilization of gas vesicles and acoustic reporter genes.
Gas vesicles and acoustic reporter genes are used for ultrasound imaging of biomolecular function.
Furthermore, we delve into the realm of ultrasound imaging of biomolecular function, encompassing the utilization of gas vesicles and acoustic reporter genes.
Approval Evidence
2 sources5 linked approval claimsfirst-pass slug acoustic-reporter-genes
Acoustic reporter genes (ARGs) have enabled imaging of gene expression with ultrasound.
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Furthermore, we delve into the realm of ultrasound imaging of biomolecular function, encompassing the utilization of gas vesicles and acoustic reporter genes.
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applicationsupports
Multiplexed acoustic reporter genes were used to delineate bacterial cell species and cell states in vitro and to image distinct subpopulations of probiotics in the mouse gastrointestinal tract and tumor-colonizing bacterial agents in vivo.
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capabilitysupports
Acoustic reporter genes enable ultrasound imaging of gene expression with high-resolution access to deep, optically opaque living tissues.
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limitationsupports
Prior acoustic reporter genes were limited to a single acoustic signature, preventing multiplexed imaging of cellular states or populations.
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application statementsupports
Gas vesicles and acoustic reporter genes are used for ultrasound imaging of biomolecular function.
Furthermore, we delve into the realm of ultrasound imaging of biomolecular function, encompassing the utilization of gas vesicles and acoustic reporter genes.
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application summarysupports
Gas vesicles and acoustic reporter genes are used for ultrasound imaging of biomolecular function.
Furthermore, we delve into the realm of ultrasound imaging of biomolecular function, encompassing the utilization of gas vesicles and acoustic reporter genes.
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Comparisons
Source-stated alternatives
The abstract contrasts ARGs with fluorescent counterparts, implying fluorescence as a nearby alternative modality.; Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
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The abstract contrasts ARGs with fluorescent counterparts, implying fluorescence as a nearby alternative modality.
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Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Source-backed strengths
high resolution access to deep, optically opaque living tissues; supports ultrasound imaging of biomolecular function; explicitly highlighted as part of biomolecular ultrasound imaging
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high resolution access to deep, optically opaque living tissues
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supports ultrasound imaging of biomolecular function
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explicitly highlighted as part of biomolecular ultrasound imaging
Compared with genetically encoded gas vesicles
Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Shared frame: source-stated alternative in extracted literature
Strengths here: high resolution access to deep, optically opaque living tissues; supports ultrasound imaging of biomolecular function; explicitly highlighted as part of biomolecular ultrasound imaging.
Relative tradeoffs: prior ARGs were limited to a single 'sound', preventing multiplexed imaging of cellular states or populations.
Source:
Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Compared with imaging
Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Shared frame: source-stated alternative in extracted literature
Strengths here: high resolution access to deep, optically opaque living tissues; supports ultrasound imaging of biomolecular function; explicitly highlighted as part of biomolecular ultrasound imaging.
Relative tradeoffs: prior ARGs were limited to a single 'sound', preventing multiplexed imaging of cellular states or populations.
Source:
Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Compared with imaging surveillance
Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Shared frame: source-stated alternative in extracted literature
Strengths here: high resolution access to deep, optically opaque living tissues; supports ultrasound imaging of biomolecular function; explicitly highlighted as part of biomolecular ultrasound imaging.
Relative tradeoffs: prior ARGs were limited to a single 'sound', preventing multiplexed imaging of cellular states or populations.
Source:
Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Compared with magnetogenetics
Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Shared frame: source-stated alternative in extracted literature
Strengths here: high resolution access to deep, optically opaque living tissues; supports ultrasound imaging of biomolecular function; explicitly highlighted as part of biomolecular ultrasound imaging.
Relative tradeoffs: prior ARGs were limited to a single 'sound', preventing multiplexed imaging of cellular states or populations.
Source:
Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Compared with optogenetic functional interrogation
Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Shared frame: source-stated alternative in extracted literature
Strengths here: high resolution access to deep, optically opaque living tissues; supports ultrasound imaging of biomolecular function; explicitly highlighted as part of biomolecular ultrasound imaging.
Relative tradeoffs: prior ARGs were limited to a single 'sound', preventing multiplexed imaging of cellular states or populations.
Source:
Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Compared with optogenetic membrane potential perturbation
Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Shared frame: source-stated alternative in extracted literature
Strengths here: high resolution access to deep, optically opaque living tissues; supports ultrasound imaging of biomolecular function; explicitly highlighted as part of biomolecular ultrasound imaging.
Relative tradeoffs: prior ARGs were limited to a single 'sound', preventing multiplexed imaging of cellular states or populations.
Source:
Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Compared with polymeric vesicles
Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Shared frame: source-stated alternative in extracted literature
Strengths here: high resolution access to deep, optically opaque living tissues; supports ultrasound imaging of biomolecular function; explicitly highlighted as part of biomolecular ultrasound imaging.
Relative tradeoffs: prior ARGs were limited to a single 'sound', preventing multiplexed imaging of cellular states or populations.
Source:
Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Compared with ultrasonography
Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Shared frame: source-stated alternative in extracted literature
Strengths here: high resolution access to deep, optically opaque living tissues; supports ultrasound imaging of biomolecular function; explicitly highlighted as part of biomolecular ultrasound imaging.
Relative tradeoffs: prior ARGs were limited to a single 'sound', preventing multiplexed imaging of cellular states or populations.
Source:
Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Compared with ultrasound imaging
Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Shared frame: source-stated alternative in extracted literature
Strengths here: high resolution access to deep, optically opaque living tissues; supports ultrasound imaging of biomolecular function; explicitly highlighted as part of biomolecular ultrasound imaging.
Relative tradeoffs: prior ARGs were limited to a single 'sound', preventing multiplexed imaging of cellular states or populations.
Source:
Gas vesicles are mentioned alongside acoustic reporter genes for ultrasound imaging. Optogenetics and magnetogenetics are mentioned as alternative in vivo control modalities with different physical constraints.
Ranked Citations
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