New Method Identifies Dynamic Genetic Effects on Gene Expression Along Cell Development Trajectories in Lung Disease
Researchers developed a novel computational framework that maps how genetic variants' effects on gene expression change dynamically as cells progress along developmental trajectories, rather than remaining constant. The method was applied to single-cell RNA sequencing data from lung tissue of pulmonary fibrosis patients and controls, identifying genes with pseudotime-dependent causal effects on disease. This approach could improve understanding of how genetic factors influence disease through cell differentiation and development processes.
A new study introduces a framework for analyzing genetic causal effects that vary along inferred cell developmental trajectories using single-cell RNA sequencing data. The researchers mapped expression quantitative trait loci (eQTLs) as dynamic parameters along pseudotime trajectories, capturing how genetic regulatory effects change continuously during cellular processes like differentiation. To address technical challenges inherent to single-cell data—including sparsity and high variability—they employed empirical likelihood-based inference methods and incorporated external bulk-eQTL data to enhance statistical power. Applied to lung tissue samples from 114 individuals (66 with idiopathic pulmonary fibrosis and 48 controls), the method identified genes with pseudotime-dependent causal effects on disease, particularly along the AT2-to-AT1 cell transition critical for lung repair. The framework also includes causal mediation analysis to distinguish direct genetic effects on disease from indirect effects mediated through cell fate changes.
What's missing
The study's limitations regarding generalizability to other tissues and diseases, validation in independent cohorts, and computational reproducibility are not detailed in the abstract provided.
What different sources said
- bioRxivCenter
Uncovering Pseudotime-Varying Genetic Causal Effects Along Single-Cell Trajectories for Pulmonary Disease Trait
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