MIQE Guidelines Calculators

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The MIQE guidelines (Minimum Information for Publication of Quantitative Real-Time PCR Experiments) are a set of standards published in 2009 by Bustin et al. in Clinical Chemistry, defining the minimum experimental and reporting information required for valid qPCR (quantitative PCR) publications. MIQE was developed in response to widespread irreproducibility in published qPCR data caused by poor experimental design, inadequate controls, improper reference gene selection, and incomplete reporting. Following MIQE standards is now expected by major journals and is essential for producing trustworthy qPCR data.

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Why MIQE Was Needed

Before MIQE, many published qPCR studies were not reproducible because they lacked: proper RNA quality assessment; validation of reference (housekeeping) genes; efficiency correction of PCR amplification; disclosure of primer sequences and amplicon details; and adequate statistical analysis. MIQE defined minimum requirements for all of these, dramatically improving data quality and reproducibility.

Key MIQE Requirements

  • RNA quality: RNA integrity number (RIN ≥ 7 for most tissues) or electropherogram must be reported; A260/A280 ratio alone is insufficient
  • Reference gene validation: At least two reference genes, validated using geNorm, NormFinder, or BestKeeper
  • PCR efficiency: Must be 90–110% (slope between −3.58 and −3.10 in standard curve); efficiency must be reported and used in calculations
  • Primer sequences: Must be reported or referenced in a primer database; amplicon size and location must be given
  • No-template controls (NTC): Required to detect contamination; must be reported
  • Melting curve analysis: Required for SYBR Green assays to verify single-product amplification

MIQE Compliance in Publication

Authors must complete the MIQE checklist (available at rdml.org or from the original paper) and submit it as supplementary material. Many journals including Nucleic Acids Research, Clinical Chemistry, and others require MIQE compliance as a condition for publication.

Glossary

MIQE (Minimum Information for Publication of Quantitative PCR)
A 2009 checklist by Bustin et al. defining minimum experimental and reporting standards for valid, reproducible qPCR publications; now required by many journals.
PCR Efficiency
The fraction of templates amplified per PCR cycle; calculated as E = (10^(−1/slope) − 1) × 100; should be 90–110% for valid ΔΔCt calculations; must be reported per MIQE.
RNA Integrity Number (RIN)
A 1–10 score from capillary electrophoresis assessing RNA degradation; RIN ≥ 7 recommended for qPCR by MIQE guidelines; low RIN leads to unreliable gene expression data.

Frequently Asked Questions

MIQE (Minimum Information for Publication of Quantitative Real-Time PCR Experiments) is a checklist of essential experimental and reporting requirements for valid qPCR publications. Key requirements: report RNA quality (RIN ≥ 7); validate at least two reference genes; confirm PCR efficiency is 90–110%; report primer sequences and amplicon details; include NTC and no-RT controls; show melting curves (SYBR Green). The guidelines ensure that published qPCR data are reproducible and that all information needed to repeat the experiment is available.

PCR efficiency (E) represents the fraction of templates amplified per cycle. E = 100% means doubling per cycle; below 90% means amplification is inhibited or the assay is suboptimal. Efficiency is calculated from standard curves: E = (10^(−1/slope) − 1) × 100, where an ideal slope is −3.32 (for 100% efficiency). If efficiency differs between your gene of interest and reference genes, the ΔΔCt method gives inaccurate fold-change calculations. MIQE requires efficiency reporting so readers can assess data validity.

A single reference (housekeeping) gene may vary with treatment, cell cycle, or tissue type — using it alone produces incorrect normalization. Using two or more reference genes allows validation through tools like geNorm, which calculates M-values (expression stability). The geometric mean of multiple stable reference genes is a more robust normalization factor. MIQE requires validation of all reference genes in the specific experimental system, not just citation of prior studies in different systems.

RIN (RNA Integrity Number) is a numerical score from 1–10 assigned by automated capillary electrophoresis (Agilent Bioanalyzer or TapeStation) based on the ratio and pattern of 18S and 28S ribosomal RNA bands. RIN 10 = fully intact; RIN 1 = completely degraded. MIQE recommends RIN ≥ 7–8 for most qPCR applications. Degraded RNA gives inconsistent Ct values because fragmentation is not random — 3′ targets are preferentially degraded, so different amplicons from the same transcript give different apparent expression levels.