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Updated: May 14, 2026
05:01
A Pathway Association Study Tool for GWAS Analyses of Metabolic Pathway Information
Published on: July 1, 2020
Pathway-based analysis of primary biliary cirrhosis genome-wide association studies
1Department of Genetics, University of Texas MD Anderson Cancer Center, Houston, TX, USA.
Genes and Immunity
|February 9, 2013
Summary
Pathway analysis of primary biliary cirrhosis (PBC) GWAS identified significant genetic associations. Tumor necrosis factor/stress signaling, phosphatidylinositol, and hedgehog signaling pathways show promise for understanding PBC susceptibility.
Area of Science:
- Genetics and Genomics
- Immunology
- Gastroenterology
Background:
- Genome-wide association studies (GWAS) have identified genetic loci linked to primary biliary cirrhosis (PBC) risk.
- Pathway analysis offers a complementary approach to conventional GWAS for understanding complex diseases.
Purpose of the Study:
- To apply a novel linear combination test for pathway analysis to independent primary biliary cirrhosis (PBC) GWAS datasets.
- To identify and validate pathway-level genetic associations with PBC susceptibility.
Main Methods:
- Utilized a linear combination test for pathways on Italian and Canadian primary biliary cirrhosis (PBC) GWAS datasets.
- Analyzed Kyoto Encyclopedia of Genes and Genomes and BioCarta pathways.
- Performed multiple comparison correction, modified gene set enrichment analysis, and Fisher exact tests for validation.
Main Results:
- Identified 25 and 26 associated pathways in the Italian and Canadian datasets, respectively (P<0.05).
- After correction, eight pathways in the Italian dataset met FDR <0.25, with tumor necrosis factor/stress-related signaling as the top pathway.
- Phosphatidylinositol signaling and hedgehog signaling pathways were replicated in both datasets and showed sustained significance.
Conclusions:
- Established and novel pathway-level associations with inherited predisposition to primary biliary cirrhosis (PBC) have been identified.
- The phosphatidylinositol signaling pathway showed significant overrepresentation of PBC-associated variants.
- Further replication and functional validation are needed to elucidate the role of these pathways in PBC etiology.
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