Scientific methodology

Scientific Methodology for Oligo Calculators

OligoPool calculators use published thermodynamic models, visible assumptions, and browser-side execution. This page explains which scientific methods support each tool, where the limits are, and which page to use for the actual calculation.

Use this methodology page when you need algorithm transparency before trusting a result. Use the Scientific References page for complete citations and the Accuracy Validation page for validation data.

Methodology Principles

  • Use published scientific models first, not proprietary black-box claims.
  • Keep calculation assumptions visible on the page where the user enters data.
  • Separate direct calculation intent from explanation, comparison, and reference pages.
  • Keep sequence calculations browser-side wherever possible so private research data does not need to be uploaded.
  • Disclose limitations so users know when empirical validation or vendor guidance is still required.

Calculator Method Shortcuts

Open Tm CalculatorOpen Primer AnalyzerOpen GC Content AnalyzerOpen Secondary Structure PredictorOpen Batch Sequence QCOpen Oligo Pool Guide

Methods by Calculator

Melting Temperature

Primer and oligo melting temperature is calculated with nearest-neighbor thermodynamics, salt correction, oligo concentration, and optional solvent adjustments.

Open Tm Calculator

Primary sources

  • SantaLucia 1998 nearest-neighbor parameters
  • Breslauer 1986 historical parameter set
  • Owczarzy 2004/2008 salt correction models

Known limitations

Unmodified DNA/RNA is supported directly. Modified bases, LNA, PTO, 2'-O-methyl RNA, and labeled probes need empirical adjustment or vendor-specific parameters.

GC Content and Composition

GC content uses direct base composition, sliding-window review, and threshold interpretation for primer, adapter, guide, probe, and pool screening.

Open GC Content Analyzer

Primary sources

  • Base composition counting
  • Application thresholds from primer and oligo design practice
  • Batch outlier screening rules

Known limitations

GC percentage is a risk signal, not a complete predictor of amplification success, synthesis yield, or binding specificity.

Secondary Structure

Hairpin, self-dimer, and hetero-dimer checks use nearest-neighbor-style free-energy scoring and practical pass/fail thresholds.

Open Secondary Structure Predictor

Primary sources

  • SantaLucia 1998 thermodynamic parameters
  • Zuker / mfold and UNAFold-style folding literature
  • PCR primer dimer threshold practice

Known limitations

Short-oligo structure scoring is a screening method. Experimental PCR failures can also come from template complexity, off-target binding, polymerase choice, or cycling conditions.

Batch Sequence QC

Pool-scale QC combines sequence length, GC range, homopolymer runs, low complexity, Tm outliers, and structure-risk flags before synthesis or vendor upload.

Open Batch Sequence QC

Primary sources

  • Oligo synthesis risk heuristics
  • Pool-level distribution analysis
  • Application-specific QC thresholds

Known limitations

Batch QC reduces preventable design risk before ordering, but it does not replace vendor-side synthesis QC, NGS validation, or application-specific wet-lab testing.

Mass, Extinction, and Dilution

Molecular weight, extinction coefficient, concentration, and dilution calculations use standard nucleotide mass and Beer-Lambert relationships.

Open Molecular Weight Calculator

Primary sources

  • Nucleotide molecular weights
  • Nearest-neighbor extinction coefficient literature
  • Standard concentration and dilution equations

Known limitations

Vendor-provided yield and purity should be used for final bench preparation when available.

Oligo Pool Coverage and Uniformity

Pool design recommendations combine representation, dropout, error-rate, coverage, and vendor-format checks into a pre-order decision checklist.

Open Oligo Pool Guide

Primary sources

  • Array-synthesis and pool QC literature
  • Coverage and representation formulas
  • Application-specific design thresholds

Known limitations

Coverage and uniformity estimates are planning aids. Final performance depends on synthesis platform, amplification bias, sequencing depth, and experimental design.

How to Read a Result

QuestionBest pageWhat to verify
Do I need a Tm number?Tm CalculatorSequence, salt, Mg2+, concentration, DMSO/formamide, method.
Do I need a full primer review?Primer AnalyzerTm, GC, molecular weight, hairpins, dimers, and mismatch checks together.
Do I need pre-order pool screening?Batch Sequence QCDistribution outliers, synthesis-risk flags, and export readiness.
Do I need citations?Scientific ReferencesPaper, DOI, PMID, method role, and implementation relevance.

Privacy as a Methodology Choice

Many oligo and primer sequences are unpublished assay designs, CRISPR libraries, diagnostic probes, or customer-specific research materials. For that reason, OligoPool calculators are designed around browser-side computation where practical. Sequence calculations happen in the browser instead of requiring sequence upload for normal tool use.

See the Privacy Policy for the site-level data statement, and use browser developer tools if you need to inspect network behavior during sensitive analysis.

Next Methodology Pages

Scientific References

Complete paper list, DOI links, and method-specific notes.

Accuracy Validation

Method evidence for Tm, structure, MW, and GC calculations.

Tm Methods Compared

Decision support for SantaLucia, Breslauer, Wallace, and GC-based methods.