AffyRNADegradation

AffyRNADegradation assesses and corrects RNA degradation in Affymetrix 3' expression arrays to improve transcript quantification accuracy.

Key Features:

• RNA Integrity Assessment: Introduces the parameter 'd' as a quantitative measure of RNA quality by evaluating positional intensity decay of specifically hybridized probes along transcripts.
• Bias Correction: Corrects probe positional bias by adjusting raw probe intensity measurements to compensate for degradation-induced decay.
• Improved Comparability: Mitigates the effects of variable RNA integrity across samples to enhance comparability of gene expression measurements.

Scientific Applications:

• Quality Control: Uses the parameter 'd' and positional decay metrics to assess RNA integrity prior to downstream analysis.
• Data Normalization: Removes degradation-induced probe intensity biases to support more accurate normalization of expression data.
• Comparative Genomics: Enables comparisons across conditions or time points by correcting for sample-to-sample RNA quality variation.

Methodology:

Estimates RNA degradation by modeling positional intensity decay of specifically hybridized probes along transcripts and computing the parameter 'd'. Applies corrections to probe intensities to address probe positional bias and effects from differential amplification efficiencies and degradation patterns.