xps

xps processes Affymetrix GeneChip expression array data, including exon arrays, gene arrays, and plate arrays, to perform preprocessing, normalization, filtering, and analysis for gene- and exon-level expression studies.

Key Features:

• Pre-processing: Facilitates initial processing of raw data from Affymetrix GeneChip expression arrays.
• Normalization: Implements normalization techniques to adjust for systematic variation across samples.
• Filtering: Provides filtering options to remove low-quality or irrelevant data points.
• Analysis: Supports comprehensive analysis workflows tailored to gene expression studies using Affymetrix arrays.
• Low-memory operation: Operates on systems with as little as 1 GB of RAM.
• Bioconductor integration: Distributed as a Bioconductor package implemented in the statistical programming language R for interoperability with other Bioconductor packages.

Scientific Applications:

• Gene expression profiling: Enable detailed gene-level expression profiling from Affymetrix GeneChip data.
• Exon-level and alternative splicing analysis: Investigate exon-level expression patterns and alternative splicing using exon arrays.
• Large-scale dataset analysis: Analyze large-scale Affymetrix datasets, including plate arrays, on systems with limited memory.
• Integrated genomics workflows: Combine xps functionality with other Bioconductor packages for integrated analyses across genomics studies.

Methodology:

Implemented in R as a Bioconductor package and performs preprocessing, normalization, filtering, and downstream expression analyses for Affymetrix GeneChip, exon, gene, and plate arrays.