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Updated: Jun 5, 2026
10:17
An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
Published on: November 3, 2010
Allelic expression profiling to dissect genome-wide association study signals
1Department of Ecology & Evolutionary Biology, University of Michigan, Ann Arbor, MI, USA. gruberjd@umich.edu
Methods in Molecular Biology (Clifton, N.J.)
|January 5, 2011
Summary
Allelic expression (AE) profiling helps pinpoint disease-associated genes by analyzing gene activity. This method identifies cis-regulatory variants, efficiently narrowing down candidate genes identified through genome-wide association studies.
Area of Science:
- Genetics
- Genomics
- Molecular Biology
Background:
- Genome-wide association studies (GWAS) identify genomic regions linked to complex diseases.
- These regions often contain multiple candidate genes, complicating gene identification.
- Functional validation is crucial to pinpoint causative genes within associated regions.
Purpose of the Study:
- To introduce and validate allelic expression (AE) profiling as a method for functional characterization of candidate genes.
- To demonstrate AE profiling's utility in narrowing down candidate genes identified by GWAS.
- To highlight AE profiling as an accessible and economical strategy for genetic research.
Main Methods:
- Utilizing heterozygous, transcribed single nucleotide polymorphisms (SNPs) to quantify relative transcript abundance.
- Comparing transcript levels between homologous gene copies to assess allelic expression.
- Analyzing the ratio of transcript abundance to detect deviations from a 1:1 ratio, indicating cis-acting regulatory effects.
Main Results:
- AE profiling reveals transcriptional differences between homologous transcripts.
- A significant deviation from a 1:1 expression ratio suggests the presence of a cis-acting regulatory allele.
- Observed patterns of cis-regulatory variation effectively narrow the list of candidate genes under a GWAS signal.
Conclusions:
- AE profiling is a powerful functional genomics approach for prioritizing candidate genes in complex disease genetics.
- The method provides a quantitative assessment of cis-regulatory variation.
- AE profiling is an accessible and cost-effective technique for disease-mapping laboratories.
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