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CRISPR Gene Editing Tool for MicroRNA Cluster Network Analysis
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Cis-acting polymorphisms affect complex traits through modifications of microRNA regulation pathways
Matthias Arnold1, Daniel C Ellwanger, Mara L Hartsperger
1Institute of Bioinformatics and Systems Biology, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany.
Plos One
|May 19, 2012
Summary
Genome-wide association studies (GWAS) reveal that most disease-associated variants impact gene regulation via microRNA (miRNA) binding sites in mRNA's 3' untranslated regions (3'-UTRs). These mutations alter miRNA regulation through various mechanisms, aiding biological interpretation of GWAS findings.
Area of Science:
- Genetics
- Molecular Biology
- Bioinformatics
Background:
- Genome-wide association studies (GWAS) identify genetic variants linked to complex diseases and traits.
- Most GWAS variants influence phenotypes through altered mRNA expression, not direct protein changes.
- MicroRNAs (miRNAs) are key post-transcriptional regulators binding to 3 -untranslated regions (3 -UTRs) of mRNAs.
Purpose of the Study:
- To investigate the overrepresentation of GWAS-identified single nucleotide polymorphisms (SNPs) in 3 -UTRs.
- To identify mechanisms by which 3 -UTR variants affect miRNA regulation.
- To support biological interpretation of GWAS results and generate new hypotheses.
Main Methods:
- Analysis of 5,101 GWAS sentinel SNPs and their linkage disequilibrium (LD) SNPs.
- Crosslinking immunoprecipitation (CLIP) data to identify miRNA binding sites and regulatory mechanisms.
- Annotation of trait-associated 3 -UTR SNPs based on identified mechanisms.
Main Results:
- Significant overrepresentation of GWAS SNPs in gene 3 -UTRs (OR = 2.33, P < 10(-52)).
- Stronger enrichment when considering all SNPs within a linkage disequilibrium bin (OR = 4.27, P < 10(-114)).
- Four mechanisms identified for miRNA regulation by 3 -UTR mutations: creation/deletion of miRNA recognition elements, altered splicing, and modified binding affinity.
Conclusions:
- GWAS variants frequently impact miRNA binding sites within 3 -UTRs.
- These variants mediate disease risk through altered post-transcriptional gene regulation.
- Findings provide a framework for interpreting GWAS results and developing testable hypotheses.
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