Our Custom LNA Oligonucleotide Synthesis service supports biotechnology companies, pharmaceutical research teams, assay developers, academic laboratories, and other organizations that require oligonucleotides with increased target affinity and precise hybridization behavior. Locked nucleic acid (LNA) monomers contain a conformationally restricted ribose that can increase duplex stability when incorporated into DNA- or RNA-based sequences. This makes LNA-modified oligonucleotides valuable for short-target recognition, single-nucleotide discrimination, antisense research, probe development, primer optimization, and low-abundance RNA analysis.
We provide application-guided sequence assessment, LNA/DNA and LNA/RNA mixmer synthesis, LNA gapmer production, functional labeling, purification, analytical verification, and delivery in project-ready formats. Each synthesis plan is developed around the intended target, modification pattern, sequence length, required purity, downstream assay, and material quantity rather than treating LNA incorporation as a routine base substitution.
Fig.1 Chemical structure of an LNA monomer: additional bridge bond between the 2' oxygen and the 4' carbon of the pentose
Uncertain LNA Placement: Adding too few LNA monomers may provide insufficient affinity improvement, while excessive or poorly positioned modifications can produce an unnecessarily high melting temperature, self-complementarity, or difficult assay conditions. We review modification number, spacing, terminal placement, target composition, and intended hybridization temperature before synthesis.
Difficult Short Targets: Conventional DNA probes may not provide enough duplex stability when the available target region is short, highly conserved, or differs from an undesired sequence by only one nucleotide. LNA incorporation can help create shorter probes with practical melting behavior and improved mismatch discrimination when the sequence is carefully designed.
Gapmer Architecture: An LNA gapmer must balance high-affinity modified wings with a central DNA region that remains compatible with RNase H recruitment. We help define wing length, DNA gap size, phosphorothioate placement, overall sequence length, and control oligos for research-stage antisense experiments.
Synthesis and Purification Complexity: Dense modification patterns, long sequences, hydrophobic dyes, multiple conjugates, and phosphorothioate backbones can complicate coupling, deprotection, purification, and recovery. Our synthesis plans account for construct-specific chemistry and select purification methods according to length, charge, hydrophobicity, and downstream use.
Assay Compatibility: An LNA oligo that binds strongly is not automatically suitable for PCR, hybridization, capture, imaging, or functional studies. We evaluate modification position relative to primer extension sites, fluorophore and quencher placement, surface attachment chemistry, target accessibility, and assay temperature requirements.
Insufficient Quality Evidence: Complex modified oligonucleotides require more than a sequence confirmation on an order form. We align analytical testing with the construct and may provide mass confirmation, chromatographic purity assessment, concentration or content determination, and application-relevant documentation according to the agreed project scope.
Our service platform covers the major design and production requirements encountered in custom LNA projects. Customers may submit a fully specified sequence and modification map or request technical input on LNA positioning, backbone chemistry, purification, labeling, and analytical requirements.
Project deliverables can include purified LNA oligonucleotides, sequence and modification specifications, analytical results, concentration information, handling recommendations, and customized tube or plate formats. Service components are selected according to the intended research workflow rather than applied as a fixed package.
The appropriate LNA format depends on the required mechanism, target length, assay environment, and downstream readout. The following matrix summarizes common configurations and the decisions that should be resolved before synthesis.
| LNA Format | Primary Design Objective | Key Configuration Choices | Purification and QC Focus | Typical Research Uses |
| LNA/DNA Mixmer | Increase target affinity while retaining the handling characteristics of a DNA-based oligonucleotide | LNA number and spacing, terminal placement, backbone type, length, target mismatch position | Full-length purity, molecular mass, concentration, separation of closely related failure sequences | Hybridization probes, primers, capture oligos, sequence-discrimination assays |
| LNA/RNA Mixmer | Combine LNA-enhanced binding with an RNA-containing sequence architecture | LNA/RNA distribution, nuclease protection strategy, target structure, handling conditions | RNase-conscious processing, mass confirmation, purity assessment, recovery evaluation | RNA interaction studies, mechanistic research, specialized hybridization tools |
| LNA Gapmer | Preserve a central DNA gap for RNase H recruitment while using LNA wings to strengthen target binding | DNA gap length, LNA wing pattern, phosphorothioate placement, target accessibility, control sequences | Backbone-related impurity resolution, mass confirmation, analytical purity, content determination | Research-stage mRNA and lncRNA knockdown, target validation, pathway studies |
| LNA Detection Probe | Improve recognition of short, low-abundance, or highly similar nucleic acid targets | Probe length, LNA density, reporter and quencher pair, mismatch location, assay temperature | Label integrity, full-length purity, mass confirmation, reporter-related recovery | qPCR, dPCR, hybridization assays, variant detection, RNA quantification |
| LNA Primer | Increase primer-target discrimination without preventing efficient polymerase extension | Modification position, 3′-end proximity, primer Tm, amplicon context, matched primer design | Sequence identity, purity, concentration, primer-pair consistency | Allele-selective PCR, genotyping research, difficult-template amplification |
| Labeled LNA Oligo | Add detection, capture, immobilization, or conjugation functionality to an LNA sequence | Attachment site, linker length, label hydrophobicity, quenching behavior, surface orientation | Conjugate identity, free-label removal, chromatographic purity, functional group integrity | Imaging probes, biosensors, affinity capture, bead- or surface-based assays |
LNA project success depends on coordinated control of sequence design, chemical architecture, purification, and analytical verification. This matrix shows how common risks are evaluated and translated into practical project deliverables.
| Assessment Area | Why It Matters | Review Approach | Service Response | Customer Deliverable |
| LNA Density | Modification density directly influences duplex stability, specificity, synthesis difficulty, and assay temperature | Review sequence length, GC distribution, target type, and required affinity shift | Adjust LNA number and spacing before final sequence approval | Defined LNA placement map with design rationale |
| Target Selectivity | Closely related sequences may remain difficult to distinguish if the mismatch is poorly positioned | Compare intended and unintended targets, mismatch location, and neighboring bases | Reposition the probe, modify length, or prepare comparative candidates | Candidate set aligned with the discrimination objective |
| Secondary Structure | Self-complementarity and target folding can reduce accessible binding despite a favorable theoretical Tm | Assess hairpins, dimers, repetitive motifs, and target-region accessibility | Shift the binding site or revise modification placement | Sequence selected for practical hybridization testing |
| Gapmer Mechanism | An unsuitable central gap or modification pattern can compromise RNase H-dependent activity | Review DNA core length, LNA wings, backbone chemistry, and target location | Configure a mechanism-compatible gapmer and appropriate controls | Gapmer specification and screening-ready materials |
| Label Interference | Large or hydrophobic labels may change solubility, purification behavior, or target binding | Evaluate attachment position, linker, reporter pair, and final assay format | Select a compatible linker and terminal or internal conjugation strategy | Purified labeled construct with identity documentation |
| Synthesis Feasibility | Long sequences, dense LNA incorporation, and multiple modifications can reduce full-length recovery | Review construct length, monomer pattern, backbone, coupling burden, and deprotection compatibility | Adapt chemistry, scale, purification, or construct architecture | Feasibility-informed production plan |
| Purification Fit | A purification method suitable for an unmodified oligo may not resolve a labeled or heavily modified construct | Evaluate size, charge, hydrophobicity, backbone, and expected impurity profile | Select chromatographic, electrophoretic, or combined purification | Material purified to the agreed fit-for-purpose specification |
| Analytical Verification | Identity and purity data are needed to interpret downstream assay results with confidence | Match analytical methods to sequence, label, molecular mass, and project stage | Perform agreed mass, chromatography, and content analyses | Structured analytical report and material information |
Our workflow connects sequence decisions with synthesis feasibility, purification requirements, and downstream use. Each stage is documented so that customers understand what will be produced, how it will be evaluated, and which design assumptions should be tested experimentally.
We collect the target sequence, requested oligo sequence, intended application, preferred LNA positions, backbone chemistry, labels, purity expectations, quantity, formulation, and delivery format. Missing technical details are identified before the project is quoted.
The proposed construct is reviewed for LNA density, melting behavior, self-complementarity, target selectivity, synthesis complexity, modification compatibility, and downstream assay constraints. Alternative designs may be recommended when the original specification creates avoidable risk.
We confirm the final sequence, modification map, synthesis scale, purification method, analytical package, formulation, packaging, and deliverables. This step provides a shared technical specification before synthesis begins.
The LNA oligonucleotide is assembled using a chemistry plan matched to its sequence and modification pattern. After cleavage and deprotection, the material is purified using the agreed method to remove truncated sequences, small-molecule impurities, and unconjugated label where applicable.
Identity, purity, and material content are evaluated according to the project specification. Analytical testing may include mass confirmation, chromatography, electrophoretic assessment, UV-based quantification, or other construct-appropriate measurements.
Materials are quality-reviewed, formatted, and delivered with the agreed documentation. Post-delivery support can address reconstitution, storage, assay setup, candidate comparison, repeat synthesis, and follow-on optimization requirements.
LNA oligonucleotide performance is determined by the combined effects of sequence, modification placement, backbone chemistry, purification, and assay conditions. Our service is structured to help customers manage these interconnected decisions through one coordinated project workflow.
LNA-modified oligonucleotides are particularly useful when conventional DNA or RNA sequences do not provide sufficient affinity, stability, or single-base discrimination. We adapt sequence architecture, labeling, purification, and delivery format to the requirements of each application.
Whether your project requires an LNA/DNA mixmer, an LNA gapmer, a short detection probe, an allele-selective primer, or a labeled capture oligonucleotide, our team can help define a synthesis and analytical plan aligned with the intended research workflow. Send us your target information, proposed sequence, application, modification requirements, quantity, purity expectation, and preferred format. We will review the construct for design and chemistry considerations and provide a project-specific proposal. Contact us to discuss your custom LNA oligonucleotide synthesis requirements.
LNA modifications significantly increase thermal stability and binding affinity, allowing for shorter oligonucleotide sequences with enhanced specificity and improved nuclease resistance.
Each LNA monomer typically increases Tm by 2-8°C, enabling the design of shorter, more specific probes while maintaining optimal hybridization temperatures.
Key applications include FISH probes for in situ hybridization, real-time PCR probes, SNP detection assays, microarray analysis, and antisense research requiring high specificity.
Strategic placement considers sequence context, with modifications typically positioned at ends or around critical bases to maximize specificity while minimizing self-complementarity.
All LNA oligonucleotides undergo comprehensive QC including HPLC purification, mass spectrometry verification, and functional validation to ensure batch-to-batch consistency.
Yes, LNA can be effectively combined with various modifications including fluorescent dyes, biotin labels, and phosphorothioate backbones for multifunctional applications.
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