Custom BNA oligonucleotide synthesis provides sequence-specific nucleic acid tools with tunable hybridization affinity, mismatch recognition, and resistance to enzymatic degradation. Bridged nucleic acids contain a conformationally constrained sugar structure that can strengthen binding to complementary RNA or DNA. Classical 2',4'-BNA is also commonly described as locked nucleic acid, while the broader BNA family includes additional bridge chemistries with distinct synthesis and performance considerations.
Our service supports the design, synthesis, purification, modification, and analytical verification of BNA-modified oligonucleotides for research-use probes, gapmers, hybridization blockers, miRNA studies, splice-modulation experiments, and sequence-selective assay development. Projects can combine BNA residues with DNA, RNA, phosphorothioate linkages, terminal labels, spacers, or conjugation handles according to sequence feasibility and the intended workflow. Related projects can also be coordinated with our custom oligonucleotide synthesis and custom LNA synthesis capabilities.
Fig. 1 The structure of BNAcoc and other 2', 4' BNANC nucleic acids. (Kim S, 2015)
Balancing Affinity and Specificity: Adding BNA residues can substantially change duplex stability, but more modification is not automatically better. Excessive stabilization may create assay temperatures that are difficult to manage or reduce useful discrimination between closely related sequences. We review BNA number, position, neighboring bases, target composition, and expected hybridization conditions before synthesis.
Building Functional Gapmers: BNA gapmers require coordinated wing and gap design. BNA-containing wings can improve target binding and protect the oligonucleotide ends, while a compatible DNA gap may be needed when the research objective depends on RNase H recruitment. Gap length, wing symmetry, backbone pattern, and target accessibility must be considered together rather than selected independently.
Managing Difficult Synthesis: BNA-modified sequences may present coupling, deprotection, hydrophobicity, or purification challenges, particularly when they contain multiple modifications, terminal labels, phosphorothioate linkages, or self-complementary regions. A sequence-specific production plan helps reduce truncation products and improves recovery of the intended full-length oligonucleotide.
Selecting Effective Purification: Desalting may be sufficient for some screening materials, while demanding probes, heavily modified sequences, or conjugated products may require RP-HPLC, ion-exchange HPLC, PAGE, or a combined approach. We match the purification strategy to sequence length, modification density, charge, hydrophobicity, required use, and analytical expectations.
Avoiding Assay Translation Problems: A BNA design that performs well in a simple duplex model may behave differently in a biological matrix, amplification workflow, surface-bound assay, or cell-based experiment. We consider probe orientation, reporter placement, target structure, salt conditions, competing sequences, controls, and downstream handling when defining the synthesis specification.
Our BNA oligonucleotide service is organized around the decisions that most strongly influence experimental performance: sequence architecture, BNA placement, backbone chemistry, purification, functional modification, and release testing. Each project is reviewed according to its intended research workflow rather than treated as a routine unmodified oligo order.
Support is available for individual sequences, comparative candidate panels, and coordinated sets of probes or gapmers. Final scope, scale, modification compatibility, and analytical methods are confirmed after technical review.
BNA oligonucleotide performance depends on how bridged residues are distributed across the sequence. The following matrix outlines common research formats and the design questions that should be resolved before synthesis.
| BNA Format | Typical Architecture | Primary Design Goal | Key Decisions | Common Research Uses |
| BNA/DNA Mixmer | Selected BNA residues distributed through a DNA sequence | Increase target affinity while retaining a flexible hybrid structure | BNA count, spacing, terminal placement, target GC content, desired melting range | Hybridization probes, blockers, capture oligos, target-binding studies |
| BNA/RNA Mixmer | BNA residues incorporated into an RNA-containing sequence when chemically feasible | Tune RNA-target recognition and improve resistance to degradation | RNA handling, sequence stability, modification compatibility, purification method | RNA interaction studies, steric-blocking research, noncoding RNA experiments |
| BNA Gapmer | BNA-containing wings surrounding a central DNA gap | Combine high-affinity binding with a mechanism-compatible central region | Wing length, DNA-gap length, backbone linkage pattern, target accessibility | Antisense screening, transcript knockdown research, target-validation studies |
| BNA Probe | Short BNA-modified sequence with optional reporter or capture group | Obtain strong hybridization from a compact probe and distinguish related targets | Probe length, mismatch location, label position, assay temperature, target structure | Variant discrimination, imaging research, probe-based detection, hybridization assays |
| BNA Clamp | High-affinity sequence designed to occupy a selected template region | Suppress extension or amplification from an unwanted sequence | Clamp position, polymerase compatibility, blocker terminus, competing-target abundance | Wild-type suppression, allele-enrichment research, selective amplification workflows |
| Labeled BNA Oligo | BNA mixmer or probe containing a dye, quencher, biotin, linker, or reactive handle | Add detection, immobilization, capture, or conjugation functionality | Attachment position, linker length, payload hydrophobicity, purification and readout method | Biosensors, affinity capture, fluorescence assays, surface-based hybridization |
Purification and analytical methods should be selected according to the actual impurity profile expected from the sequence and modification pattern. No single method is optimal for every BNA oligonucleotide, particularly when labels, phosphorothioate linkages, or conjugates are present.
| Method | Primary Purpose | Best-Fit Projects | Typical Deliverable | Planning Considerations |
| Desalting | Remove small-molecule synthesis and buffer components | Early screening sequences where high-resolution impurity removal is not required | Desalted BNA oligonucleotide with basic quantity information | Does not generally resolve full-length product from closely related truncations |
| RP-HPLC | Separate products according to hydrophobic interaction and retention behavior | Labeled probes, hydrophobic modifications, many mixed-base BNA sequences | Purified product with analytical chromatographic assessment | Labels and conjugates can strongly alter retention and recovery |
| Ion-Exchange HPLC | Resolve oligonucleotide species according to charge-related behavior | Longer or highly charged sequences and selected backbone-modified constructs | Purified fraction with method-appropriate purity evaluation | Resolution depends on length, linkage pattern, salt conditions, and sequence composition |
| PAGE | Separate full-length material from shorter products according to electrophoretic mobility | Selected high-purity probes, short demanding sequences, and length-resolved applications | Gel-purified product with recovery and quantity documentation | Recovery, scale, labels, and certain conjugates may limit suitability |
| Mass Spectrometry | Confirm molecular mass and support product-identity assessment | BNA mixmers, gapmers, probes, and many labeled or conjugated products | Observed mass data compared with the expected construct | Instrument mode and interpretation depend on molecular size, salts, and modification chemistry |
| Analytical HPLC | Evaluate chromatographic purity and detect major product-related impurities | Purified BNA oligos, labeled probes, and conjugated constructs | Chromatogram and reported purity under the selected method | A single method may not distinguish every structurally related impurity |
| UV Quantitation | Estimate oligonucleotide concentration or recovered quantity | Routine delivery of BNA sequences with known composition | Concentration, optical-density, or calculated quantity information | Extinction-coefficient calculations should account for sequence and attached chromophores |
| Thermal Analysis | Compare duplex stability across candidates or modification patterns | Probe panels, mismatch studies, and BNA-placement optimization projects | Melting profiles or comparative thermal data under defined conditions | Results depend on buffer, salt, strand concentration, target format, and measurement method |
Each project follows a sequence-specific workflow that connects experimental intent with a manufacturable oligonucleotide specification. Technical review is completed before synthesis so that architecture, purification, and analytical expectations are aligned from the beginning.
We collect the target sequence, requested oligonucleotide sequence, intended research application, required scale, preferred format, modifications, and expected analytical package. When the sequence has not been finalized, the target region and assay conditions are reviewed to define a suitable starting architecture.
The sequence is assessed for BNA placement, GC content, self-complementarity, repetitive motifs, target accessibility, modification compatibility, and anticipated purification difficulty. Alternative designs may be proposed when the original request creates unnecessary synthesis or assay risk.
The final sequence, BNA pattern, backbone linkages, labels, terminal chemistry, purification method, quantity, delivery format, and analytical methods are documented for approval. This specification provides a shared reference for synthesis and final data review.
The BNA-modified oligonucleotide is assembled using a chemistry plan matched to the selected monomers and backbone. Cleavage, deprotection, and intermediate handling are adjusted for the complete modification pattern rather than optimized only for the unmodified portions of the sequence.
Crude material is processed using the confirmed desalting, HPLC, PAGE, or combined purification strategy. Identity, purity, and quantity are assessed using the agreed analytical methods, with additional review when labels or conjugates create complex product profiles.
The final material is supplied in the selected dry or solution format with sequence, modification, quantity, and analytical documentation. Post-delivery support can address reconstitution, storage, control selection, assay setup, or follow-on candidate design.
BNA synthesis requires more than inserting modified monomers into a standard DNA sequence. Our service connects sequence design, synthesis feasibility, purification, and application requirements so that customers receive materials that are better aligned with their intended experiments.
BNA modifications are useful when a project requires strong sequence recognition from a compact oligonucleotide, improved resistance to nucleases, or controlled hybridization against closely related targets. The most suitable architecture depends on whether the oligonucleotide must bind, block, recruit an enzyme, report a signal, or capture a target.
Whether your project requires a BNA/DNA mixmer, gapmer, short high-affinity probe, PCR clamp, labeled oligonucleotide, or conjugated research tool, our team can help translate the intended experiment into a practical synthesis specification. Share the target or oligonucleotide sequence, preferred BNA pattern, required modifications, quantity, purification expectations, and intended workflow so that we can review feasibility and recommend an appropriate production plan. Contact us to begin a custom BNA oligonucleotide synthesis project.
BNA incorporates advanced bridged structures with optimized ring sizes that provide superior binding affinity, enhanced nuclease resistance, and improved specificity compared to first-generation LNA technology.
BNA modifications significantly increase thermal stability, enhance hybridization specificity, and improve resistance to enzymatic degradation, making them ideal for demanding applications requiring high precision.
Multiple BNA variants including 2',4'-BNA, BNANC, and novel bridged structures are available, each offering distinct advantages in affinity, specificity, and biochemical properties.
Yes, BNA can be effectively integrated with various backbone modifications, fluorescent labels, and functional groups to create multifunctional oligonucleotides for complex research applications.
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