Custom RNA imaging probes for transcript localization, single-molecule detection, live-cell imaging, multiplex RNA visualization and spatial biology research. Bio-Synthesis manufactures fluorescently labeled RNA probes, molecular beacons, smFISH probe sets, barcoded imaging probes and custom RNA visualization oligonucleotides.
RNA imaging probes are oligonucleotide-based detection reagents designed to visualize RNA molecules within cells, tissues, organoids and biological samples.
Unlike conventional RNA sequencing methods that measure transcript abundance after extraction, RNA imaging techniques preserve spatial information and reveal where transcripts are located within their native biological environment.
RNA imaging probes can be used for single-transcript detection, RNA localization studies, multiplex gene-expression analysis, live-cell RNA tracking and spatial transcriptomics workflows. Depending on the application, probe architectures may incorporate fluorescent dyes, molecular beacons, barcode sequences, amplification domains, quencher systems or specialized chemical modifications.
Bio-Synthesis manufactures custom RNA imaging probes with fluorescent labeling, barcode integration, probe pools, conjugation chemistry and custom oligonucleotide design support.
Probe hybridization creates visible fluorescent signal for transcript localization and imaging.
Custom sequences hybridize to specific RNA targets, isoforms or transcript panels.
Barcoded and readout-based architectures support multiplex RNA visualization.
RNA imaging is broader than spatial transcriptomics. It includes direct RNA FISH, smFISH, molecular beacons, MERFISH, seqFISH and custom barcoded imaging workflows.
single RNA molecules
signal-on probes
barcoded RNA imaging
sequential imaging
smFISH — multiple fluorescent probes bind one transcript to visualize single RNA molecules.
High sensitivity, direct detection and strong transcript localization.
Single-gene validation, RNA localization and mechanistic imaging studies.
Multiple fluorescent oligos tiled along one RNA transcript.
Molecular Beacons — stem-loop probes that fluoresce when opened by target binding.
Low background, target-triggered signal and high specificity.
Dynamic RNA monitoring, live-cell studies and signal-on hybridization assays.
Hairpin probe with fluorophore and quencher that separates upon target binding.
MERFISH — barcoded RNA imaging with encoding and readout probe sets.
Very high multiplexing, error-robust barcodes and spatial gene-expression mapping.
Cell atlas studies, tumor microenvironment mapping and large gene panels.
Encoding probes carry barcode readout sequences decoded through imaging rounds.
seqFISH — sequential hybridization cycles identify RNA targets through combinatorial readout.
High multiplex capacity and flexible panel design.
Spatial gene-expression profiling and multiplex RNA imaging.
Sequential readout probes produce transcript-specific fluorescence patterns.
Probe architecture can be simple or highly engineered depending on whether the goal is direct detection, signal-on hybridization, multiplex barcoding or amplified readout.
labeled oligos
dye + quencher
readout sequences
higher sensitivity
Direct Fluorescent Probes — terminal or internal dyes produce signal after hybridization.
FAM, HEX, TAMRA, ROX, Cy3, Cy5, Alexa Fluor, ATTO and NIR dye options.
5′, 3′ or internal dye placement can be considered depending on design.
RNA FISH, smFISH, localization studies and fluorescent readout probes.
Molecular Beacon Format — probe is dark when closed and fluorescent when target-bound.
BHQ, Dabcyl, Iowa Black and other dark quenchers can be evaluated.
Stem stability and target-binding loop determine background and signal response.
RNA detection, live-cell studies and real-time hybridization monitoring.
Barcoded RNA Imaging Probes — add barcode and readout domains for multiplex imaging.
Secondary probes bind barcode sequences during imaging cycles.
Target-binding probes carry transcript identity information.
Spatial transcriptomics, high-plex RNA imaging and custom gene panels.
Amplified Imaging Probes — probe systems designed for stronger signal or low-abundance transcripts.
Architecture can include handles or domains that support signal amplification systems.
Probe density, readout strategy and amplification may improve visibility.
Background controls and specificity checks are important for amplified systems.
Bio-Synthesis supports a wide range of fluorescent dyes, quenchers, haptens, spacers, conjugation handles and custom modified oligonucleotide designs for RNA imaging workflows.
FAM, HEX, TET, TAMRA, ROX, Cy3, Cy5, Cy5.5, Cy7, Alexa Fluor, ATTO, NIR and specialty imaging dyes.
BHQ-1, BHQ-2, BHQ-3, Iowa Black, Dabcyl and custom quencher strategies for beacon probes.
Biotin, DIG, DNP, amino, thiol, azide, alkyne and other conjugation handles.
Internal amino-dT, internal fluorophores, PEG spacers, HEG, TEG and flexible linker options.
Need a dye not listed? Review the full fluorescent labeling options here: Fluorescent-Labeled Oligonucleotides.
Map transcript location within cells, tissues, organoids or subcellular compartments.
Use signal-on or specialized probe formats for dynamic RNA monitoring workflows.
Visualize neuronal transcripts, cell-type markers and region-specific RNA patterns.
Study tumor biomarkers, microenvironment patterns and spatial RNA signatures.
Support MERFISH, seqFISH and other barcoded spatial RNA imaging workflows.
Validate RNA-seq or single-cell findings using targeted fluorescent RNA probes.
RNA imaging probe performance depends on target accessibility, fluorophore selection, signal-to-background ratio, multiplex design and sample type.
brightness • channel fit
quenchers • controls
barcodes • readouts
cells • tissue • FFPE
Fluorophore Selection — match dye brightness, excitation and emission to the imaging platform.
Choose dyes around laser lines, filter sets, detector sensitivity and autofluorescence.
Consider photostability for long imaging sessions or repeated imaging cycles.
Terminal or internal dye placement should be matched to probe architecture.
Signal-to-Background Optimization — reduce nonspecific signal and improve contrast.
Sequence design and hybridization conditions affect background signal.
Molecular beacons use dye/quencher proximity to stay dark until target binding.
No-probe, scrambled, mismatch and positive-control probes help evaluate specificity.
Multiplex Strategy — plan barcodes, readouts and fluorescent channels before synthesis.
Readout sequences should be orthogonal and compatible across imaging cycles.
Minimize bleed-through between fluorophores and readout channels.
Larger panels require careful design review and sequence management.
Sample Type — probe design should account for RNA accessibility and preparation conditions.
Often suitable for smFISH, RNA localization and targeted imaging.
May require attention to penetration, background and autofluorescence.
RNA fragmentation and fixation effects can influence probe design and target choice.
Define transcript, isoform, marker panel or pathway genes.
Select smFISH, beacon, barcode, readout or amplification strategy.
Choose fluorophores, quenchers, haptens, spacers or handles.
Manufacture custom oligos, probe pools or labeled probe sets.
Support analytical testing, concentration, documentation and custom packaging.
Apply probes in RNA FISH, live-cell, spatial or multiplex imaging workflows.
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Broad dye portfolio, NIR dyes, internal labels and multiplex-compatible readout probes.
smFISH, molecular beacons, barcoded probes, readout probes and custom RNA imaging formats.
RNA imaging probe programs require controlled synthesis, labeling, purification, analytical QC, sequence handling and delivery documentation.
Bio-Synthesis supports custom RNA imaging probes, fluorescent labels, quenchers, barcoded probe pools, conjugation chemistry, purification, analytical QC, documentation and project-specific packaging.
Technical note: Final RNA imaging probe design should be evaluated within the target transcript, sample preparation, imaging platform, dye channels, probe architecture and experimental objective.
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