The RNA integrity number is an algorithmic score of RNA integrity inferred from an electropherogram. Its original scale runs from 1 for strongly degraded preparations to 10 for high integrity. The method developed by Andreas Schroeder and colleagues combines several trace features using a trained neural network regression model, rather than using a single ribosomal-peak ratio.[ref]
The RIN: an RNA integrity number for assigning integrity values to RNA measurements by Andreas Schroeder and others. Abstract, Feature selection and Model training
The original apparatus separates RNA in microfluidic channels and detects it through fluorescence. The resulting electropherogram reports signal against migration time. Peak and region features summarize the size distribution; the trained model maps that feature vector to an integrity score.[ref]
The RIN: an RNA integrity number for assigning integrity values to RNA measurements by Andreas Schroeder and others. Techniques for measuring RNA integrity and Figure1
An original area calculation illustrates why a shape feature differs from total signal. If a selected region has integrated signal and the whole trace has in consistent units, its area fraction is . Multiplying every signal value by two gives . Adding signal in a different fragment-size region can instead change the fraction. This simple ratio is not the RNA integrity number algorithm; it illustrates how a trace can contain information distinct from total material.
Training a score also requires checking predictions on measurements not used for fitting. Table1 of the original study partitions 1339 electropherograms into 937 training and 402 test records.[ref]
The RIN: an RNA integrity number for assigning integrity values to RNA measurements by Andreas Schroeder and others. Table1: electropherogram counts
For a constructed error example, predicted scores and against labels and have mean squared error . That evaluates agreement with labels; it does not count intact molecules.An RNA integrity number of 8 therefore cannot be converted into an intact fraction or a universal assay-success probability. Its interpretation also requires the specimen type and intended analysis: bulk ribosomal RNA features do not directly certify every individual messenger RNA.
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The RNA Integrity Number (RIN) is a metric used to assess the quality and integrity of RNA samples, particularly in molecular biology and genomics. It provides a quantitative measure of RNA degradation, which is crucial for ensuring reliable results in downstream applications such as quantitative PCR (qPCR), microarray analysis, and RNA sequencing. The RIN ranges from 1 to 10, where: - **10** indicates intact RNA with no degradation, - **1** indicates highly degraded RNA.