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Updated: May 12, 2026

An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations

An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations

Published on: November 3, 2010

Gene expression drives local adaptation in humans.

Hunter B Fraser¹

¹Department of Biology, Stanford University, Stanford, California 94305, USA. hbfraser@stanford.edu

Genome Research

|March 30, 2013

Summary

Human adaptation is primarily driven by changes in gene expression, not protein sequences. This study reveals gene expression shifts in UV response, immunity, and metabolism, supporting gene expression as a key evolutionary mechanism.

Area of Science:

Human evolutionary genetics
Molecular biology
Population genetics

Background:

The molecular drivers of human adaptation, specifically the roles of protein-coding versus gene expression changes, remain debated.
Recent advances in human population genotyping have identified numerous local adaptations differentiating populations.

Purpose of the Study:

To investigate whether human local adaptations more frequently involve changes in gene expression or protein sequences.
To identify polygenic adaptations in gene expression related to environmental pressures and human health.

Main Methods:

Analysis of genetic data from diverse human populations to identify local adaptations.
Development of a novel framework to detect polygenic adaptations in gene expression.

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An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations

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Examination of genes associated with UV radiation response, immune cell proliferation, and metabolic pathways.

Main Results:

Local adaptations are over 10-fold more likely to impact gene expression than amino acid sequences.
A new method identified polygenic adaptations in gene expression linked to UV response, immunity, and diabetes pathways.
These findings represent the first examples of polygenic gene expression adaptation in humans.

Conclusions:

Changes in gene expression play a more significant role in human adaptation than previously emphasized.
Gene expression evolution provides genome-scale support for its role in driving human adaptation.
This research highlights the importance of studying gene expression in understanding human evolutionary history.