Jointly analyzing gene expression and copy number data in breast cancer using data reduction models

Area of Science:

• Genomics
• Bioinformatics
• Computational Biology

Background:

• Integrating diverse genomic measurements (gene expression, copy number) is crucial for understanding molecular events.
• Existing methods face challenges in analyzing multiple data types simultaneously.

Purpose of the Study:

• To develop a novel framework for integrating and analyzing gene expression and copy number data.
• To identify genes exhibiting correlated variation patterns across different genomic measurements.

Main Methods:

• Utilized generalized singular value decomposition (GSVD) to analyze joint gene expression and copy number data.
• Iteratively projected data onto different decomposition directions using a projection angle (theta) to find variation patterns.
• Validated the algorithm with simulated data and conducted a case study on breast cancer genomic data.

Main Results:

• The GSVD-based framework successfully identified similar and dissimilar variation patterns between gene expression and copy number data.
• Demonstrated efficacy on genome-wide breast cancer studies, pinpointing genes with significant variations in both measurements.
• Identified statistically significant genes common to both expression and copy number datasets.

Conclusions:

• The proposed method effectively integrates and analyzes joint copy number and expression data.
• The framework aids in discovering biologically relevant genes by identifying concordant variations across genomic data types.
• This approach is valuable for various genomic studies requiring integrated analysis of copy number and expression data.