Likelihood ratio test for changes in homeolog expression bias

Likelihood ratio test for changes in homeolog expression bias tests for shifts in expression bias between homeologous gene pairs across conditions using a likelihood ratio test to assess changes in expression ratios.

Key Features:

• Likelihood Ratio Test (LRT): The core statistical method is the likelihood ratio test for comparing expression ratios of duplicate genes.
• Homeolog Expression Analysis: Specifically tailored to assess homeologous gene pairs arising from whole genome duplications.
• Condition Comparison: Compares expression patterns across two distinct conditions (e.g., different tissues such as leaves and petals).
• RNA-seq Data Compatibility: Operates on expression data derived from RNA-seq experiments.
• Sensitivity Assessment: Evaluates sensitivity to varying levels of homeolog expression bias.
• Comparative Performance: Demonstrates superior performance compared to alternative methods for detecting changes in homeolog expression bias.

Scientific Applications:

• Evolutionary Biology: Infers evolutionary processes such as subfunctionalization or neofunctionalization of duplicate genes by detecting changes in expression bias.
• Genomics and Transcriptomics: Applicable to RNA-seq data for transcriptome-level analysis of gene expression differences between duplicates.
• General Gene Expression Dynamics: Can be extended to analyze expression differences between any two genes across different conditions.

Methodology:

Uses RNA-seq data from different conditions to compare homeologous gene pairs (in the referenced study, leaves and petals of an allotetraploid monkeyflower, Mimulus luteus); the tool's sensitivity to varying levels of homeolog expression bias is evaluated and its performance is compared against alternative methods.