Custom locked nucleic acid (LNA) probe synthesis supports research teams that need stronger target binding, shorter probe architectures, or improved differentiation between closely related DNA and RNA sequences. LNA monomers contain a conformationally constrained ribose structure that can increase duplex stability when incorporated at selected positions within an oligonucleotide. These properties make LNA-enhanced probes particularly useful for challenging hybridization assays involving short targets, low-GC regions, single-nucleotide differences, small RNAs, splice variants, and highly homologous sequences.
Our custom LNA probe synthesis services integrate target review, sequence design, LNA placement, reporter and quencher selection, oligonucleotide synthesis, purification, and analytical verification. Projects can be configured for qPCR and dPCR research, variant discrimination, RNA localization, FISH, melting analysis, target capture, and other hybridization-based workflows. Each probe is planned around the intended assay rather than treated as a standard modified oligonucleotide, helping customers align probe chemistry with target accessibility, instrument channels, multiplex requirements, and experimental conditions.
Fig 1. Main principle of DNA detection by short LNA/DNA capture probes. (Miotke et al., 2015)
Insufficient Binding to Short Targets: Conventional DNA probes may not provide a suitable melting profile when the accessible target region is unusually short or AT-rich. Strategic LNA incorporation can raise duplex affinity without simply extending the probe into an unfavorable sequence region. We review target context, probe length, GC distribution, and assay temperature before recommending an LNA pattern.
Poor Single-Base Discrimination: A high-affinity probe is not automatically a selective probe. Excessive or poorly positioned LNA residues can stabilize both matched and mismatched duplexes. We evaluate mismatch location, neighboring bases, competing sequences, and probe orientation to develop candidates that balance target binding with practical allele or variant discrimination.
Overstabilized Probe Designs: Too many LNA residues may produce a melting temperature outside the useful assay window or increase self-complementary interactions. Our design process considers modification density, spacing, hairpin potential, probe dimers, and primer-probe interactions so that affinity enhancement remains compatible with the complete assay.
Reporter and Quencher Compatibility: Fluorescent labels, dark quenchers, spacers, and internal modifications can affect purification, signal behavior, and probe handling. We help select an appropriate labeling architecture based on excitation and emission channels, multiplex composition, probe format, and the required detection mechanism.
Purification of Complex Probes: Short LNA-rich sequences and dual-labeled constructs can generate closely related synthesis impurities that require application-matched purification. Purification and analytical methods are selected according to sequence length, modification pattern, hydrophobic labeling groups, and the intended research workflow.
Our service platform supports both customer-defined sequences and projects that require complete probe design. Customers may submit a target sequence, genomic region, transcript identifier, existing assay design, or preferred LNA pattern. We then develop a synthesis and verification plan aligned with the probe format, experimental readout, and required deliverables.
LNA probe projects can also be coordinated with our broader custom LNA oligonucleotide synthesis capabilities when a study requires unlabeled controls, competitor probes, blockers, primers, or multiple chemically related oligonucleotides.
The appropriate LNA probe architecture depends on how the target is recognized, how the signal is generated, and whether the probe must distinguish a closely related sequence. The matrix below summarizes common research formats and the principal decisions that should be resolved before synthesis.
| LNA Probe Format | Typical Architecture | Suitable Research Use | Critical Design Focus | Available Deliverables |
| Hydrolysis Probe | Short LNA/DNA probe with a 5′ reporter and 3′ quencher | qPCR, dPCR, expression analysis, target quantification, and multiplex amplification assays | Probe melting profile, reporter-quencher pairing, amplicon position, and primer compatibility | Probe only, primer-probe set, comparison probe, or multiplex panel |
| Variant Probe | LNA-modified probe centered on or positioned near a discriminating base | SNP analysis, allele discrimination, mutation research, and closely related sequence differentiation | Mismatch location, sequence context, LNA placement, and matched-versus-mismatched melting behavior | Single probe, paired allele probes, labeled panel, or screening candidates |
| Molecular Beacon | Stem-loop probe containing a reporter, quencher, and LNA-enhanced recognition region | Real-time hybridization monitoring, intracellular research assays, and high-specificity target recognition | Stem stability, loop affinity, fluorophore quenching, and conformational switching | Custom beacon, target-specific controls, and alternative stem-loop candidates |
| FISH Probe | Fluorescently labeled LNA/DNA probe or coordinated probe set | DNA locus visualization, RNA localization, transcript imaging, and chromosome research | Target accessibility, probe uniqueness, fluorophore selection, and hybridization stringency | Individual probe, multi-probe set, labeled control, or multiplex configuration |
| RNA Detection Probe | Short LNA-enhanced probe with a fluorescent, affinity, or enzyme-compatible label | miRNA detection, small RNA analysis, Northern blotting, and transcript localization | Related RNA family members, mature-versus-precursor recognition, accessibility, and label placement | Single target probe, family panel, mismatch control, or localization probe |
| Capture Probe | LNA/DNA probe containing biotin, thiol, amino, or another immobilization handle | Target enrichment, bead capture, microarray, biosensor, and surface-hybridization research | Attachment orientation, spacer length, surface density, target accessibility, and regeneration conditions | Functionalized probe, soluble comparison probe, spacer variants, or capture panel |
| Melting Probe | LNA-enhanced labeled or unlabeled probe designed for duplex melting analysis | Sequence discrimination, genotyping research, and matched-versus-mismatched duplex comparison | Duplex transition range, mismatch position, salt conditions, and sequence-dependent melting behavior | Unlabeled probe, fluorescent probe, matched controls, or candidate set |
LNA probe performance depends on the interaction between target sequence, modification pattern, labeling chemistry, purification, and assay conditions. The following matrix outlines the design factors reviewed during a custom project and explains how each factor affects the final synthesis plan.
| Decision Factor | Why It Matters | Technical Review | Potential Adjustment | Project Output |
| Target Region | The selected region determines sequence uniqueness, accessibility, probe length, and cross-reactivity risk | Target alignment, transcript context, homolog review, repetitive sequence screening, and strand selection | Shift the probe window, change orientation, or develop multiple candidates | Recommended target region and candidate sequence list |
| LNA Placement | Modification position influences duplex affinity, mismatch behavior, and secondary structure | Position-by-position review of LNA density, spacing, sequence context, and terminal placement | Redistribute LNA residues or reduce modification density | Annotated probe sequence with LNA modification map |
| Melting Profile | The probe must hybridize within the intended reaction or wash-temperature window | Comparative melting assessment, GC review, probe length evaluation, and assay-condition alignment | Alter length, LNA content, or hybridization conditions | Design rationale and expected operating window |
| Mismatch Position | Discrimination varies with the identity and location of the mismatch and its neighboring bases | Matched and mismatched sequence comparison with alternative probe orientations | Recenter the discriminating base or evaluate paired candidate probes | Variant-specific probe recommendation or candidate panel |
| Secondary Structure | Probe folding, self-dimerization, or target folding may reduce effective hybridization | Hairpin, homodimer, heterodimer, and local target-structure review | Move the target window, modify probe length, or revise LNA spacing | Structure-screened sequence set |
| Label Configuration | Dye, quencher, linker, and attachment site affect signal generation and purification behavior | Instrument compatibility, spectral overlap, quenching mechanism, and conjugation-site review | Change reporter, quencher, spacer, or labeling position | Final modification specification |
| Multiplex Compatibility | Multiple probes must function without spectral or sequence-level interference | Dye-channel allocation, probe-primer interaction screening, and melting-profile harmonization | Reassign labels, adjust sequences, or separate incompatible targets | Multiplex-ready probe plan |
| Purification Strategy | LNA-rich and labeled probes may contain closely related truncated or unconjugated species | Review of sequence length, charge, hydrophobicity, label chemistry, and expected impurity profile | Select an alternative chromatographic or electrophoretic approach | Purified probe and method-specific analytical documentation |
| Analytical Package | Different research stages require different levels of identity, purity, and concentration information | Evaluation of downstream assay sensitivity, material quantity, and documentation needs | Add concentration, spectral, chromatographic, or comparative characterization | Agreed analytical report and material specification |
Each project follows a defined design-to-delivery workflow while allowing the level of technical support to be adjusted. Customers with finalized sequences may begin with synthesis review, whereas new assay projects can include target analysis, candidate design, and modification planning.
We collect the target sequence, intended assay, probe format, instrument channels, desired labels, material quantity, and documentation requirements. Existing primers, amplicons, competing sequences, or previous probe results can also be reviewed to define the technical problem accurately.
Candidate regions are evaluated for uniqueness, target accessibility, GC balance, secondary structure, and interactions with other assay oligonucleotides. Probe length and LNA positions are then proposed according to the required affinity and discrimination profile.
The sequence, LNA map, terminal chemistry, reporter, quencher, purification approach, analytical package, and delivery format are documented for review. This confirmation step helps prevent ambiguity before synthesis and allows procurement and research teams to align on deliverables.
The oligonucleotide is assembled using a synthesis plan suited to its length and LNA content. Fluorescent dyes, quenchers, affinity tags, spacers, or reactive handles are introduced through the selected on-support or post-synthesis modification route.
The probe is purified using a method selected for its sequence and modification profile. Identity and purity are evaluated using the agreed analytical methods, with additional concentration or spectral characterization included when specified in the project scope.
Final materials are supplied with sequence and modification information, handling details, and the agreed analytical documentation. Post-delivery discussions can address reconstitution, storage, assay setup, candidate comparison, or a revised design when further optimization is required.
LNA probes require coordinated decisions across sequence design, hybridization thermodynamics, labeling chemistry, synthesis, and analytical verification. Our service model connects these activities so that customers receive a probe specification developed around the complete research workflow.
LNA-enhanced probes are useful when conventional oligonucleotides cannot provide the required affinity, probe length, or sequence discrimination. Our synthesis services support individual feasibility studies as well as coordinated probe panels for established research workflows.
Whether your project requires a finalized LNA probe sequence, complete target-to-probe design, a dual-labeled qPCR construct, an allele-specific probe set, an RNA localization probe, or an immobilization-ready capture oligonucleotide, our team can develop a project plan around your assay requirements. Share the target sequence, application, preferred probe format, labels, quantity, and analytical expectations so that we can evaluate design feasibility and recommend a practical synthesis strategy. Related support is also available through our diagnostic probes and oligos platform and guidance on HPLC and PAGE purification options. Contact us to request a technical discussion or quotation for custom LNA probe synthesis.
The locked ribose structure in LNA probes provides enhanced binding affinity and thermal stability, allowing for shorter probe sequences with improved mismatch discrimination capabilities.
Optimal LNA placement depends on sequence composition, target accessibility, and desired melting temperature, with strategic positioning typically at probe ends or surrounding critical bases for maximum specificity enhancement.
Yes, LNA technology enables design of multiple probes with distinct melting temperatures, making them ideal for multiplex assays where precise temperature control and specific hybridization are required.
All LNA probes undergo rigorous HPLC purification to achieve ≥95% purity, with mass spectrometry verification and functional validation to guarantee optimal hybridization performance.
LNA incorporation accelerates hybridization rates while maintaining stringent specificity, enabling faster assay times and improved signal-to-noise ratios in detection applications.
Loading ......
